diff --git a/client/contracts/CELOTornado.-1.json b/client/contracts/CELOTornado.-1.json
index 2361706..6696fd1 100644
--- a/client/contracts/CELOTornado.-1.json
+++ b/client/contracts/CELOTornado.-1.json
@@ -8,6 +8,11 @@
           "name": "_verifier",
           "type": "address"
         },
+        {
+          "internalType": "contract IFeeManager",
+          "name": "_feeManager",
+          "type": "address"
+        },
         {
           "internalType": "uint256",
           "name": "_denomination",
@@ -215,6 +220,21 @@
       "stateMutability": "payable",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "feeManager",
+      "outputs": [
+        {
+          "internalType": "contract IFeeManager",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -406,6 +426,21 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "protocolFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -539,21 +574,21 @@
       "type": "function"
     }
   ],
-  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x708938fd083239d2e9cd17e457cf25a2150bb900082fad58af8b689f786aef9c\",\"urls\":[\"bzz-raw://f345afd62002f883c60c032cd0cb051663dc8a3e59a52bf44109633b96cb3685\",\"dweb:/ipfs/QmNwjnH2uyNoq9GPjNUv6Z1mgtiR5rY3K7EHY74RBjXMpw\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0x09c70432243629ef44697fd3d0ca89d3578e2b1c9f46d90757371edb163c14da\",\"urls\":[\"bzz-raw://d2a2c9fa85c32cb15793282792cd25c71804a10aa5a911e41f3bcd07f5df117e\",\"dweb:/ipfs/QmeQ1s6ypNnP7fossR4x9svuuLjcSBtQ5spUTmWGZY5Ljr\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
+  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"contract IFeeManager\",\"name\":\"_feeManager\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"feeManager\",\"outputs\":[{\"internalType\":\"contract IFeeManager\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"protocolFee\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x5c57c88351063f1864166162f6f32be5aebae197a18abaef8d08d67b36440a51\",\"urls\":[\"bzz-raw://6da2d6faa828b1cad43428366d273e4aa61fc176d6541fb641028985497caa0f\",\"dweb:/ipfs/QmULz388t88hr999vUk5PidTTJwbEWGUyb3d6QGnDA6qoV\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0xe7db8acb3efcecf95c7364f447ed1764c571dbf5090fd4641fe4668a965332eb\",\"urls\":[\"bzz-raw://45e790c247c38ed8ae473e3165c1148ea10a753cf6e9f9c8742394019be2aef6\",\"dweb:/ipfs/QmaGfk1ndvqur2NvCY3TWoKuorfBVShXeykKei18GDY582\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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+  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n  uint256 public protocolFee;\n\n  constructor(\n    IVerifier _verifier,\n    IFeeManager _feeManager,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _feeManager, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n    // 0.5% fee\n    protocolFee = _denomination / 200;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _relayer_fee, uint256 _refund, address _feeTo) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    bool feeOn = _feeTo != address(0);\n    if (feeOn) {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee - protocolFee);\n      _safeErc20Transfer(_feeTo, protocolFee);\n    } else {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee);\n    }\n\n    if (_relayer_fee > 0) {\n      _safeErc20Transfer(_relayer, _relayer_fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
   "sourcePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
   "ast": {
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
     "exportedSymbols": {
       "ERC20Tornado": [
-        227
+        266
       ]
     },
-    "id": 228,
+    "id": 267,
     "nodeType": "SourceUnit",
     "nodes": [
       {
@@ -571,8 +606,8 @@
         "file": "./Tornado.sol",
         "id": 2,
         "nodeType": "ImportDirective",
-        "scope": 228,
-        "sourceUnit": 1195,
+        "scope": 267,
+        "sourceUnit": 971,
         "src": "780:23:0",
         "symbolAliases": [],
         "unitAlias": ""
@@ -586,10 +621,10 @@
               "id": 3,
               "name": "Tornado",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1194,
+              "referencedDeclaration": 970,
               "src": "830:7:0",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_Tornado_$1194",
+                "typeIdentifier": "t_contract$_Tornado_$970",
                 "typeString": "contract Tornado"
               }
             },
@@ -599,19 +634,19 @@
           }
         ],
         "contractDependencies": [
-          694,
-          1194,
-          3245
+          632,
+          970,
+          1000
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": true,
-        "id": 227,
+        "id": 266,
         "linearizedBaseContracts": [
-          227,
-          1194,
-          3245,
-          694
+          266,
+          970,
+          1000,
+          632
         ],
         "name": "ERC20Tornado",
         "nodeType": "ContractDefinition",
@@ -621,7 +656,7 @@
             "id": 6,
             "name": "token",
             "nodeType": "VariableDeclaration",
-            "scope": 227,
+            "scope": 266,
             "src": "842:20:0",
             "stateVariable": true,
             "storageLocation": "default",
@@ -643,28 +678,54 @@
             "value": null,
             "visibility": "public"
           },
+          {
+            "constant": false,
+            "id": 8,
+            "name": "protocolFee",
+            "nodeType": "VariableDeclaration",
+            "scope": 266,
+            "src": "866:26:0",
+            "stateVariable": true,
+            "storageLocation": "default",
+            "typeDescriptions": {
+              "typeIdentifier": "t_uint256",
+              "typeString": "uint256"
+            },
+            "typeName": {
+              "id": 7,
+              "name": "uint256",
+              "nodeType": "ElementaryTypeName",
+              "src": "866:7:0",
+              "typeDescriptions": {
+                "typeIdentifier": "t_uint256",
+                "typeString": "uint256"
+              }
+            },
+            "value": null,
+            "visibility": "public"
+          },
           {
             "body": {
-              "id": 29,
+              "id": 40,
               "nodeType": "Block",
-              "src": "1079:25:0",
+              "src": "1151:80:0",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 27,
+                    "id": 32,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 25,
+                      "id": 30,
                       "name": "token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
                       "referencedDeclaration": 6,
-                      "src": "1085:5:0",
+                      "src": "1157:5:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -674,31 +735,114 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 26,
+                      "id": 31,
                       "name": "_token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 16,
-                      "src": "1093:6:0",
+                      "referencedDeclaration": 20,
+                      "src": "1165:6:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1085:14:0",
+                    "src": "1157:14:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
-                  "id": 28,
+                  "id": 33,
                   "nodeType": "ExpressionStatement",
-                  "src": "1085:14:0"
+                  "src": "1157:14:0"
+                },
+                {
+                  "expression": {
+                    "argumentTypes": null,
+                    "id": 38,
+                    "isConstant": false,
+                    "isLValue": false,
+                    "isPure": false,
+                    "lValueRequested": false,
+                    "leftHandSide": {
+                      "argumentTypes": null,
+                      "id": 34,
+                      "name": "protocolFee",
+                      "nodeType": "Identifier",
+                      "overloadedDeclarations": [],
+                      "referencedDeclaration": 8,
+                      "src": "1193:11:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "nodeType": "Assignment",
+                    "operator": "=",
+                    "rightHandSide": {
+                      "argumentTypes": null,
+                      "commonType": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      },
+                      "id": 37,
+                      "isConstant": false,
+                      "isLValue": false,
+                      "isPure": false,
+                      "lValueRequested": false,
+                      "leftExpression": {
+                        "argumentTypes": null,
+                        "id": 35,
+                        "name": "_denomination",
+                        "nodeType": "Identifier",
+                        "overloadedDeclarations": [],
+                        "referencedDeclaration": 14,
+                        "src": "1207:13:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_uint256",
+                          "typeString": "uint256"
+                        }
+                      },
+                      "nodeType": "BinaryOperation",
+                      "operator": "/",
+                      "rightExpression": {
+                        "argumentTypes": null,
+                        "hexValue": "323030",
+                        "id": 36,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "kind": "number",
+                        "lValueRequested": false,
+                        "nodeType": "Literal",
+                        "src": "1223:3:0",
+                        "subdenomination": null,
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_rational_200_by_1",
+                          "typeString": "int_const 200"
+                        },
+                        "value": "200"
+                      },
+                      "src": "1207:19:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "src": "1193:33:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "id": 39,
+                  "nodeType": "ExpressionStatement",
+                  "src": "1193:33:0"
                 }
               ]
             },
             "documentation": null,
-            "id": 30,
+            "id": 41,
             "implemented": true,
             "kind": "constructor",
             "modifiers": [
@@ -706,25 +850,38 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 19,
+                    "id": 23,
                     "name": "_verifier",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 8,
-                    "src": "1016:9:0",
+                    "referencedDeclaration": 10,
+                    "src": "1075:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   {
                     "argumentTypes": null,
-                    "id": 20,
+                    "id": 24,
+                    "name": "_feeManager",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 12,
+                    "src": "1086:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  {
+                    "argumentTypes": null,
+                    "id": 25,
                     "name": "_denomination",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 10,
-                    "src": "1027:13:0",
+                    "referencedDeclaration": 14,
+                    "src": "1099:13:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -732,12 +889,12 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 21,
+                    "id": 26,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 12,
-                    "src": "1042:17:0",
+                    "referencedDeclaration": 16,
+                    "src": "1114:17:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -745,103 +902,131 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 22,
+                    "id": 27,
                     "name": "_operator",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 14,
-                    "src": "1061:9:0",
+                    "referencedDeclaration": 18,
+                    "src": "1133:9:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   }
                 ],
-                "id": 23,
+                "id": 28,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 18,
+                  "id": 22,
                   "name": "Tornado",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 1194,
-                  "src": "1008:7:0",
+                  "referencedDeclaration": 970,
+                  "src": "1067:7:0",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_Tornado_$1194_$",
+                    "typeIdentifier": "t_type$_t_contract$_Tornado_$970_$",
                     "typeString": "type(contract Tornado)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1008:63:0"
+                "src": "1067:76:0"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 17,
+              "id": 21,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 8,
+                  "id": 10,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "884:19:0",
+                  "scope": 41,
+                  "src": "914:19:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$891",
+                    "typeIdentifier": "t_contract$_IVerifier_$648",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 7,
+                    "id": 9,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 891,
-                    "src": "884:9:0",
+                    "referencedDeclaration": 648,
+                    "src": "914:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   "value": null,
                   "visibility": "internal"
                 },
-                {
-                  "constant": false,
-                  "id": 10,
-                  "name": "_denomination",
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-                  "src": "909:21:0",
-                  "stateVariable": false,
-                  "storageLocation": "default",
-                  "typeDescriptions": {
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-                    "typeString": "uint256"
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-                    "name": "uint256",
-                    "nodeType": "ElementaryTypeName",
-                    "src": "909:7:0",
-                    "typeDescriptions": {
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-                      "typeString": "uint256"
-                    }
-                  },
-                  "value": null,
-                  "visibility": "internal"
-                },
                 {
                   "constant": false,
                   "id": 12,
+                  "name": "_feeManager",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "939:23:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeString": "contract IFeeManager"
+                  },
+                  "typeName": {
+                    "contractScope": null,
+                    "id": 11,
+                    "name": "IFeeManager",
+                    "nodeType": "UserDefinedTypeName",
+                    "referencedDeclaration": 654,
+                    "src": "939:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
+                {
+                  "constant": false,
+                  "id": 14,
+                  "name": "_denomination",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "968:21:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_uint256",
+                    "typeString": "uint256"
+                  },
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+                    "name": "uint256",
+                    "nodeType": "ElementaryTypeName",
+                    "src": "968:7:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
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+                  "id": 16,
                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "936:24:0",
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+                  "src": "995:24:0",
                   "stateVariable": false,
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@@ -849,10 +1034,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 11,
+                    "id": 15,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "936:6:0",
+                    "src": "995:6:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -863,11 +1048,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 14,
+                  "id": 18,
                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "966:17:0",
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+                  "src": "1025:17:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -875,10 +1060,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 13,
+                    "id": 17,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "966:7:0",
+                    "src": "1025:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -890,11 +1075,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 16,
+                  "id": 20,
                   "name": "_token",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "989:14:0",
+                  "scope": 41,
+                  "src": "1048:14:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -902,10 +1087,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 15,
+                    "id": 19,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "989:7:0",
+                    "src": "1048:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -916,25 +1101,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "878:129:0"
+              "src": "908:158:0"
             },
             "returnParameters": {
-              "id": 24,
+              "id": 29,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1079:0:0"
+              "src": "1151:0:0"
             },
-            "scope": 227,
-            "src": "867:237:0",
+            "scope": 266,
+            "src": "897:334:0",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 50,
+              "id": 61,
               "nodeType": "Block",
-              "src": "1144:155:0",
+              "src": "1271:155:0",
               "statements": [
                 {
                   "expression": {
@@ -946,7 +1131,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 37,
+                        "id": 48,
                         "isConstant": false,
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@@ -955,18 +1140,18 @@
                           "argumentTypes": null,
                           "expression": {
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-                            "id": 34,
+                            "id": 45,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1158:3:0",
+                            "referencedDeclaration": 1015,
+                            "src": "1285:3:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 35,
+                          "id": 46,
                           "isConstant": false,
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@@ -974,7 +1159,7 @@
                           "memberName": "value",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "1158:9:0",
+                          "src": "1285:9:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -985,14 +1170,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 36,
+                          "id": 47,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1171:1:0",
+                          "src": "1298:1:0",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -1000,7 +1185,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1158:14:0",
+                        "src": "1285:14:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1009,14 +1194,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4554482076616c756520697320737570706f73656420746f206265203020666f7220455243323020696e7374616e6365",
-                        "id": 38,
+                        "id": 49,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1174:50:0",
+                        "src": "1301:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_b14b0818f1fdc710b92ba7e1ce725992b43e47a5b220b1b890f352eeac2e1d5e",
@@ -1036,21 +1221,21 @@
                           "typeString": "literal_string \"ETH value is supposed to be 0 for ERC20 instance\""
                         }
                       ],
-                      "id": 33,
+                      "id": 44,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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-                        3264
+                        1018,
+                        1019
                       ],
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-                      "src": "1150:7:0",
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+                      "src": "1277:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 39,
+                    "id": 50,
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@@ -1058,15 +1243,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1150:75:0",
+                    "src": "1277:75:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 40,
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                   "nodeType": "ExpressionStatement",
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                   "expression": {
@@ -1076,18 +1261,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 42,
+                          "id": 53,
                           "name": "msg",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 3260,
-                          "src": "1254:3:0",
+                          "referencedDeclaration": 1015,
+                          "src": "1381:3:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_message",
                             "typeString": "msg"
                           }
                         },
-                        "id": 43,
+                        "id": 54,
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@@ -1095,7 +1280,7 @@
                         "memberName": "sender",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "1254:10:0",
+                        "src": "1381:10:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -1106,14 +1291,14 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 45,
+                            "id": 56,
                             "name": "this",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3284,
-                            "src": "1274:4:0",
+                            "referencedDeclaration": 1041,
+                            "src": "1401:4:0",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           }
@@ -1121,24 +1306,24 @@
                         "expression": {
                           "argumentTypes": [
                             {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           ],
-                          "id": 44,
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                           "isConstant": false,
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                           "isPure": true,
                           "lValueRequested": false,
                           "nodeType": "ElementaryTypeNameExpression",
-                          "src": "1266:7:0",
+                          "src": "1393:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_type$_t_address_$",
                             "typeString": "type(address)"
                           },
                           "typeName": "address"
                         },
-                        "id": 46,
+                        "id": 57,
                         "isConstant": false,
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@@ -1146,7 +1331,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "1266:13:0",
+                        "src": "1393:13:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -1154,12 +1339,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 47,
+                        "id": 58,
                         "name": "denomination",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 897,
-                        "src": "1281:12:0",
+                        "referencedDeclaration": 660,
+                        "src": "1408:12:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1181,18 +1366,18 @@
                           "typeString": "uint256"
                         }
                       ],
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+                      "id": 52,
                       "name": "_safeErc20TransferFrom",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 171,
-                      "src": "1231:22:0",
+                      "referencedDeclaration": 210,
+                      "src": "1358:22:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,address,uint256)"
                       }
                     },
-                    "id": 48,
+                    "id": 59,
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@@ -1200,48 +1385,48 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1231:63:0",
+                    "src": "1358:63:0",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
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+                  "src": "1358:63:0"
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             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
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+              "id": 42,
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-              "src": "1132:2:0"
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+            "src": "1235:191:0",
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@@ -1253,7 +1438,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
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@@ -1262,18 +1447,18 @@
                           "argumentTypes": null,
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-                            "id": 63,
+                            "id": 76,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1437:3:0",
+                            "referencedDeclaration": 1015,
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                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
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@@ -1281,7 +1466,7 @@
                           "memberName": "value",
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                           "referencedDeclaration": null,
-                          "src": "1437:9:0",
+                          "src": "1588:9:0",
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                             "typeString": "uint256"
@@ -1291,18 +1476,18 @@
                         "operator": "==",
                         "rightExpression": {
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-                          "id": 65,
+                          "id": 78,
                           "name": "_refund",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 59,
-                          "src": "1450:7:0",
+                          "referencedDeclaration": 70,
+                          "src": "1601:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "1437:20:0",
+                        "src": "1588:20:0",
                         "typeDescriptions": {
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                           "typeString": "bool"
@@ -1311,14 +1496,14 @@
                       {
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                         "hexValue": "496e636f727265637420726566756e6420616d6f756e742072656365697665642062792074686520636f6e7472616374",
-                        "id": 67,
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1459:50:0",
+                        "src": "1610:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_3189ced290ffd29dc422911cd3b29574f21c524c91f4b41e6abb0646c581cbff",
@@ -1338,21 +1523,21 @@
                           "typeString": "literal_string \"Incorrect refund amount received by the contract\""
                         }
                       ],
-                      "id": 62,
+                      "id": 75,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1018,
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+                      "src": "1580:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
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                     },
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@@ -1360,178 +1545,158 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1429:81:0",
+                    "src": "1580:81:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 69,
+                  "id": 82,
                   "nodeType": "ExpressionStatement",
-                  "src": "1429:81:0"
+                  "src": "1580:81:0"
                 },
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-                    "arguments": [
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-                        "argumentTypes": null,
-                        "id": 71,
-                        "name": "_recipient",
-                        "nodeType": "Identifier",
-                        "overloadedDeclarations": [],
-                        "referencedDeclaration": 53,
-                        "src": "1536:10:0",
+                  "assignments": [
+                    84
+                  ],
+                  "declarations": [
+                    {
+                      "constant": false,
+                      "id": 84,
+                      "name": "feeOn",
+                      "nodeType": "VariableDeclaration",
+                      "scope": 151,
+                      "src": "1668:10:0",
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_bool",
+                        "typeString": "bool"
+                      },
+                      "typeName": {
+                        "id": 83,
+                        "name": "bool",
+                        "nodeType": "ElementaryTypeName",
+                        "src": "1668:4:0",
                         "typeDescriptions": {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
+                          "typeIdentifier": "t_bool",
+                          "typeString": "bool"
                         }
                       },
-                      {
-                        "argumentTypes": null,
-                        "commonType": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        },
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-                        "isPure": false,
-                        "lValueRequested": false,
-                        "leftExpression": {
-                          "argumentTypes": null,
-                          "id": 72,
-                          "name": "denomination",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 897,
-                          "src": "1548:12:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "nodeType": "BinaryOperation",
-                        "operator": "-",
-                        "rightExpression": {
-                          "argumentTypes": null,
-                          "id": 73,
-                          "name": "_fee",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 57,
-                          "src": "1563:4:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "src": "1548:19:0",
-                        "typeDescriptions": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      }
-                    ],
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-                      "argumentTypes": [
-                        {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
-                        },
-                        {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      ],
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-                      "src": "1517:18:0",
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-                        "typeString": "function (address,uint256)"
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-                    "src": "1517:51:0",
-                    "typeDescriptions": {
-                      "typeIdentifier": "t_tuple$__$",
-                      "typeString": "tuple()"
+                      "value": null,
+                      "visibility": "internal"
                     }
-                  },
-                  "id": 76,
-                  "nodeType": "ExpressionStatement",
-                  "src": "1517:51:0"
-                },
-                {
-                  "condition": {
+                  ],
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+                  "initialValue": {
                     "argumentTypes": null,
                     "commonType": {
-                      "typeIdentifier": "t_uint256",
-                      "typeString": "uint256"
+                      "typeIdentifier": "t_address",
+                      "typeString": "address"
                     },
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+                    "id": 89,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 77,
-                      "name": "_fee",
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+                      "name": "_feeTo",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 57,
-                      "src": "1578:4:0",
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+                      "src": "1681:6:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_uint256",
-                        "typeString": "uint256"
+                        "typeIdentifier": "t_address",
+                        "typeString": "address"
                       }
                     },
                     "nodeType": "BinaryOperation",
-                    "operator": ">",
+                    "operator": "!=",
                     "rightExpression": {
                       "argumentTypes": null,
-                      "hexValue": "30",
-                      "id": 78,
+                      "arguments": [
+                        {
+                          "argumentTypes": null,
+                          "hexValue": "30",
+                          "id": 87,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": true,
+                          "kind": "number",
+                          "lValueRequested": false,
+                          "nodeType": "Literal",
+                          "src": "1699:1:0",
+                          "subdenomination": null,
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          },
+                          "value": "0"
+                        }
+                      ],
+                      "expression": {
+                        "argumentTypes": [
+                          {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          }
+                        ],
+                        "id": 86,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "lValueRequested": false,
+                        "nodeType": "ElementaryTypeNameExpression",
+                        "src": "1691:7:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_type$_t_address_$",
+                          "typeString": "type(address)"
+                        },
+                        "typeName": "address"
+                      },
+                      "id": 88,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
-                      "kind": "number",
+                      "kind": "typeConversion",
                       "lValueRequested": false,
-                      "nodeType": "Literal",
-                      "src": "1585:1:0",
-                      "subdenomination": null,
+                      "names": [],
+                      "nodeType": "FunctionCall",
+                      "src": "1691:10:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_rational_0_by_1",
-                        "typeString": "int_const 0"
-                      },
-                      "value": "0"
+                        "typeIdentifier": "t_address_payable",
+                        "typeString": "address payable"
+                      }
                     },
-                    "src": "1578:8:0",
+                    "src": "1681:20:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
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-                  "id": 86,
-                  "nodeType": "IfStatement",
-                  "src": "1574:63:0",
-                  "trueBody": {
-                    "id": 85,
+                  "nodeType": "VariableDeclarationStatement",
+                  "src": "1668:33:0"
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "id": 91,
+                    "name": "feeOn",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 84,
+                    "src": "1711:5:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_bool",
+                      "typeString": "bool"
+                    }
+                  },
+                  "falseBody": {
+                    "id": 114,
                     "nodeType": "Block",
-                    "src": "1588:49:0",
+                    "src": "1859:74:0",
                     "statements": [
                       {
                         "expression": {
@@ -1539,12 +1704,12 @@
                           "arguments": [
                             {
                               "argumentTypes": null,
-                              "id": 81,
-                              "name": "_relayer",
+                              "id": 108,
+                              "name": "_recipient",
                               "nodeType": "Identifier",
                               "overloadedDeclarations": [],
-                              "referencedDeclaration": 55,
-                              "src": "1615:8:0",
+                              "referencedDeclaration": 64,
+                              "src": "1886:10:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_address_payable",
                                 "typeString": "address payable"
@@ -1552,12 +1717,44 @@
                             },
                             {
                               "argumentTypes": null,
-                              "id": 82,
-                              "name": "_fee",
-                              "nodeType": "Identifier",
-                              "overloadedDeclarations": [],
-                              "referencedDeclaration": 57,
-                              "src": "1625:4:0",
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 111,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "id": 109,
+                                "name": "denomination",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 660,
+                                "src": "1898:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 110,
+                                "name": "_relayer_fee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 68,
+                                "src": "1913:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1898:27:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_uint256",
                                 "typeString": "uint256"
@@ -1575,18 +1772,18 @@
                                 "typeString": "uint256"
                               }
                             ],
-                            "id": 80,
+                            "id": 107,
                             "name": "_safeErc20Transfer",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 226,
-                            "src": "1596:18:0",
+                            "referencedDeclaration": 265,
+                            "src": "1867:18:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
                               "typeString": "function (address,uint256)"
                             }
                           },
-                          "id": 83,
+                          "id": 112,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -1594,15 +1791,231 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "1596:34:0",
+                          "src": "1867:59:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_tuple$__$",
                             "typeString": "tuple()"
                           }
                         },
-                        "id": 84,
+                        "id": 113,
                         "nodeType": "ExpressionStatement",
-                        "src": "1596:34:0"
+                        "src": "1867:59:0"
+                      }
+                    ]
+                  },
+                  "id": 115,
+                  "nodeType": "IfStatement",
+                  "src": "1707:226:0",
+                  "trueBody": {
+                    "id": 106,
+                    "nodeType": "Block",
+                    "src": "1718:135:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 93,
+                              "name": "_recipient",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 64,
+                              "src": "1745:10:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 98,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "commonType": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                },
+                                "id": 96,
+                                "isConstant": false,
+                                "isLValue": false,
+                                "isPure": false,
+                                "lValueRequested": false,
+                                "leftExpression": {
+                                  "argumentTypes": null,
+                                  "id": 94,
+                                  "name": "denomination",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 660,
+                                  "src": "1757:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "nodeType": "BinaryOperation",
+                                "operator": "-",
+                                "rightExpression": {
+                                  "argumentTypes": null,
+                                  "id": 95,
+                                  "name": "_relayer_fee",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 68,
+                                  "src": "1772:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "src": "1757:27:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 97,
+                                "name": "protocolFee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 8,
+                                "src": "1787:11:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1757:41:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 92,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1726:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 99,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1726:73:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 100,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1726:73:0"
+                      },
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 102,
+                              "name": "_feeTo",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 72,
+                              "src": "1826:6:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 103,
+                              "name": "protocolFee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 8,
+                              "src": "1834:11:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 101,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1807:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 104,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1807:39:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 105,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1807:39:0"
                       }
                     ]
                   }
@@ -1614,19 +2027,19 @@
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     },
-                    "id": 89,
+                    "id": 118,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 87,
-                      "name": "_refund",
+                      "id": 116,
+                      "name": "_relayer_fee",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 59,
-                      "src": "1647:7:0",
+                      "referencedDeclaration": 68,
+                      "src": "1943:12:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1637,14 +2050,14 @@
                     "rightExpression": {
                       "argumentTypes": null,
                       "hexValue": "30",
-                      "id": 88,
+                      "id": 117,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "1657:1:0",
+                      "src": "1958:1:0",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_0_by_1",
@@ -1652,34 +2065,168 @@
                       },
                       "value": "0"
                     },
-                    "src": "1647:11:0",
+                    "src": "1943:16:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
                   "falseBody": null,
-                  "id": 111,
+                  "id": 125,
                   "nodeType": "IfStatement",
-                  "src": "1643:203:0",
+                  "src": "1939:79:0",
                   "trueBody": {
-                    "id": 110,
+                    "id": 124,
                     "nodeType": "Block",
-                    "src": "1660:186:0",
+                    "src": "1961:57:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 120,
+                              "name": "_relayer",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 66,
+                              "src": "1988:8:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 121,
+                              "name": "_relayer_fee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 68,
+                              "src": "1998:12:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 119,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1969:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 122,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1969:42:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 123,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1969:42:0"
+                      }
+                    ]
+                  }
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "commonType": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
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+                        "typeString": "uint256"
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+                      "subdenomination": null,
+                      "typeDescriptions": {
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+                        "typeString": "int_const 0"
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+                      "value": "0"
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+                    "typeDescriptions": {
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                     "statements": [
                       {
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                         ],
                         "declarations": [
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                             "constant": false,
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-                            "src": "1669:12:0",
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@@ -1687,10 +2234,10 @@
                               "typeString": "bool"
                             },
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+                              "id": 129,
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@@ -1701,21 +2248,21 @@
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                               "hexValue": "",
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@@ -1734,12 +2281,12 @@
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@@ -1757,18 +2304,18 @@
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-                                  "src": "1687:10:0",
+                                  "referencedDeclaration": 64,
+                                  "src": "2068:10:0",
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                                     "typeString": "address payable"
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@@ -1776,13 +2323,13 @@
                                 "memberName": "call",
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                                 "referencedDeclaration": null,
-                                "src": "1687:15:0",
+                                "src": "2068:15:0",
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                                   "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1790,13 +2337,13 @@
                               "memberName": "value",
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                               "referencedDeclaration": null,
-                              "src": "1687:21:0",
+                              "src": "2068:21:0",
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                                 "typeString": "function (uint256) pure returns (function (bytes memory) payable returns (bool,bytes memory))"
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@@ -1804,13 +2351,13 @@
                             "lValueRequested": false,
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                             "nodeType": "FunctionCall",
-                            "src": "1687:30:0",
+                            "src": "2068:30:0",
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                               "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1818,19 +2365,19 @@
                           "lValueRequested": false,
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                           "nodeType": "FunctionCall",
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                             "typeString": "tuple(bool,bytes memory)"
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@@ -1838,15 +2385,15 @@
                           "nodeType": "UnaryOperation",
                           "operator": "!",
                           "prefix": true,
-                          "src": "1733:8:0",
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-                            "src": "1734:7:0",
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@@ -1858,13 +2405,13 @@
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@@ -1872,12 +2419,12 @@
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                                       "typeString": "uint256"
@@ -1893,18 +2440,18 @@
                                   ],
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-                                    "src": "1805:8:0",
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                                       "typeString": "address payable"
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@@ -1912,13 +2459,13 @@
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                                   "referencedDeclaration": null,
-                                  "src": "1805:17:0",
+                                  "src": "2186:17:0",
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                                     "typeString": "function (uint256)"
                                   }
                                 },
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@@ -1926,15 +2473,15 @@
                                 "lValueRequested": false,
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                                 "nodeType": "FunctionCall",
-                                "src": "1805:26:0",
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                                   "typeString": "tuple()"
                                 }
                               },
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@@ -1945,23 +2492,23 @@
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             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
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@@ -1969,10 +2516,10 @@
                     "typeString": "address payable"
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+                    "id": 63,
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@@ -1984,11 +2531,11 @@
                 },
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+                  "id": 66,
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-                  "src": "1357:24:0",
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@@ -1996,10 +2543,10 @@
                     "typeString": "address payable"
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+                    "id": 65,
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                     "stateMutability": "payable",
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@@ -2011,11 +2558,11 @@
                 },
                 {
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-                  "id": 57,
-                  "name": "_fee",
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+                  "name": "_relayer_fee",
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-                  "src": "1383:12:0",
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@@ -2023,10 +2570,10 @@
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@@ -2037,11 +2584,11 @@
                 },
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@@ -2049,10 +2596,10 @@
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                       "typeString": "uint256"
@@ -2060,41 +2607,68 @@
                   },
                   "value": null,
                   "visibility": "internal"
+                },
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+                  "name": "_feeTo",
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+                  "src": "1549:14:0",
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+                  "storageLocation": "default",
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+                    "typeString": "address"
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+                    "name": "address",
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@@ -2102,10 +2676,10 @@
                         "typeString": "bool"
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@@ -2116,11 +2690,11 @@
                     },
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@@ -2128,10 +2702,10 @@
                         "typeString": "bytes"
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@@ -2141,7 +2715,7 @@
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@@ -2151,14 +2725,14 @@
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-                            "src": "2016:10:0",
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@@ -2168,12 +2742,12 @@
                           },
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                               "typeString": "address"
@@ -2181,12 +2755,12 @@
                           },
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@@ -2194,12 +2768,12 @@
                           },
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@@ -2227,18 +2801,18 @@
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-                            "referencedDeclaration": 3247,
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+                            "referencedDeclaration": 1002,
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                             "typeDescriptions": {
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                               "typeString": "abi"
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@@ -2246,13 +2820,13 @@
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                           "referencedDeclaration": null,
-                          "src": "1993:22:0",
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -2260,7 +2834,7 @@
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-                        "src": "1993:74:0",
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                           "typeString": "bytes memory"
@@ -2276,18 +2850,18 @@
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@@ -2295,13 +2869,13 @@
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-                      "src": "1982:10:0",
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@@ -2309,14 +2883,14 @@
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@@ -3034,12 +3608,12 @@
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@@ -3063,18 +3637,18 @@
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                               "typeString": "abi"
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@@ -3082,13 +3656,13 @@
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -3096,7 +3670,7 @@
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                           "typeString": "bytes memory"
@@ -3112,18 +3686,18 @@
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@@ -3131,13 +3705,13 @@
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                         "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -3145,14 +3719,14 @@
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@@ -3160,12 +3734,12 @@
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@@ -3240,7 +3814,7 @@
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@@ -3294,20 +3868,20 @@
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@@ -3319,7 +3893,7 @@
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@@ -3373,7 +3947,7 @@
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@@ -3409,21 +3983,21 @@
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@@ -3431,32 +4005,32 @@
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@@ -3469,12 +4043,12 @@
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@@ -3485,13 +4059,13 @@
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@@ -3499,14 +4073,14 @@
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@@ -3526,18 +4100,18 @@
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@@ -3559,21 +4133,21 @@
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@@ -3644,15 +4218,15 @@
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-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -4556,20 +5286,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 54,
+                        "id": 65,
                         "name": "ElementaryTypeName",
-                        "src": "1357:15:0"
+                        "src": "1484:15:0"
                       }
                     ],
-                    "id": 55,
+                    "id": 66,
                     "name": "VariableDeclaration",
-                    "src": "1357:24:0"
+                    "src": "1484:24:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
-                      "name": "_fee",
-                      "scope": 113,
+                      "name": "_relayer_fee",
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4582,20 +5312,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 56,
+                        "id": 67,
                         "name": "ElementaryTypeName",
-                        "src": "1383:7:0"
+                        "src": "1510:7:0"
                       }
                     ],
-                    "id": 57,
+                    "id": 68,
                     "name": "VariableDeclaration",
-                    "src": "1383:12:0"
+                    "src": "1510:20:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4608,19 +5338,46 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 58,
+                        "id": 69,
                         "name": "ElementaryTypeName",
-                        "src": "1397:7:0"
+                        "src": "1532:7:0"
                       }
                     ],
-                    "id": 59,
+                    "id": 70,
                     "name": "VariableDeclaration",
-                    "src": "1397:15:0"
+                    "src": "1532:15:0"
+                  },
+                  {
+                    "attributes": {
+                      "constant": false,
+                      "name": "_feeTo",
+                      "scope": 152,
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "type": "address",
+                      "value": null,
+                      "visibility": "internal"
+                    },
+                    "children": [
+                      {
+                        "attributes": {
+                          "name": "address",
+                          "stateMutability": "nonpayable",
+                          "type": "address"
+                        },
+                        "id": 71,
+                        "name": "ElementaryTypeName",
+                        "src": "1549:7:0"
+                      }
+                    ],
+                    "id": 72,
+                    "name": "VariableDeclaration",
+                    "src": "1549:14:0"
                   }
                 ],
-                "id": 60,
+                "id": 73,
                 "name": "ParameterList",
-                "src": "1328:85:0"
+                "src": "1455:109:0"
               },
               {
                 "attributes": {
@@ -4629,9 +5386,9 @@
                   ]
                 },
                 "children": [],
-                "id": 61,
+                "id": 74,
                 "name": "ParameterList",
-                "src": "1423:0:0"
+                "src": "1574:0:0"
               },
               {
                 "children": [
@@ -4665,16 +5422,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
                               ],
-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 62,
+                            "id": 75,
                             "name": "Identifier",
-                            "src": "1429:7:0"
+                            "src": "1580:7:0"
                           },
                           {
                             "attributes": {
@@ -4709,18 +5466,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3260,
+                                      "referencedDeclaration": 1015,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 63,
+                                    "id": 76,
                                     "name": "Identifier",
-                                    "src": "1437:3:0"
+                                    "src": "1588:3:0"
                                   }
                                 ],
-                                "id": 64,
+                                "id": 77,
                                 "name": "MemberAccess",
-                                "src": "1437:9:0"
+                                "src": "1588:9:0"
                               },
                               {
                                 "attributes": {
@@ -4728,18 +5485,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 59,
+                                  "referencedDeclaration": 70,
                                   "type": "uint256",
                                   "value": "_refund"
                                 },
-                                "id": 65,
+                                "id": 78,
                                 "name": "Identifier",
-                                "src": "1450:7:0"
+                                "src": "1601:7:0"
                               }
                             ],
-                            "id": 66,
+                            "id": 79,
                             "name": "BinaryOperation",
-                            "src": "1437:20:0"
+                            "src": "1588:20:0"
                           },
                           {
                             "attributes": {
@@ -4754,149 +5511,65 @@
                               "type": "literal_string \"Incorrect refund amount received by the contract\"",
                               "value": "Incorrect refund amount received by the contract"
                             },
-                            "id": 67,
+                            "id": 80,
                             "name": "Literal",
-                            "src": "1459:50:0"
+                            "src": "1610:50:0"
                           }
                         ],
-                        "id": 68,
+                        "id": 81,
                         "name": "FunctionCall",
-                        "src": "1429:81:0"
+                        "src": "1580:81:0"
                       }
                     ],
-                    "id": 69,
+                    "id": 82,
                     "name": "ExpressionStatement",
-                    "src": "1429:81:0"
-                  },
-                  {
-                    "children": [
-                      {
-                        "attributes": {
-                          "argumentTypes": null,
-                          "isConstant": false,
-                          "isLValue": false,
-                          "isPure": false,
-                          "isStructConstructorCall": false,
-                          "lValueRequested": false,
-                          "names": [
-                            null
-                          ],
-                          "type": "tuple()",
-                          "type_conversion": false
-                        },
-                        "children": [
-                          {
-                            "attributes": {
-                              "argumentTypes": [
-                                {
-                                  "typeIdentifier": "t_address_payable",
-                                  "typeString": "address payable"
-                                },
-                                {
-                                  "typeIdentifier": "t_uint256",
-                                  "typeString": "uint256"
-                                }
-                              ],
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 226,
-                              "type": "function (address,uint256)",
-                              "value": "_safeErc20Transfer"
-                            },
-                            "id": 70,
-                            "name": "Identifier",
-                            "src": "1517:18:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 53,
-                              "type": "address payable",
-                              "value": "_recipient"
-                            },
-                            "id": 71,
-                            "name": "Identifier",
-                            "src": "1536:10:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "commonType": {
-                                "typeIdentifier": "t_uint256",
-                                "typeString": "uint256"
-                              },
-                              "isConstant": false,
-                              "isLValue": false,
-                              "isPure": false,
-                              "lValueRequested": false,
-                              "operator": "-",
-                              "type": "uint256"
-                            },
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 897,
-                                  "type": "uint256",
-                                  "value": "denomination"
-                                },
-                                "id": 72,
-                                "name": "Identifier",
-                                "src": "1548:12:0"
-                              },
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 57,
-                                  "type": "uint256",
-                                  "value": "_fee"
-                                },
-                                "id": 73,
-                                "name": "Identifier",
-                                "src": "1563:4:0"
-                              }
-                            ],
-                            "id": 74,
-                            "name": "BinaryOperation",
-                            "src": "1548:19:0"
-                          }
-                        ],
-                        "id": 75,
-                        "name": "FunctionCall",
-                        "src": "1517:51:0"
-                      }
-                    ],
-                    "id": 76,
-                    "name": "ExpressionStatement",
-                    "src": "1517:51:0"
+                    "src": "1580:81:0"
                   },
                   {
                     "attributes": {
-                      "falseBody": null
+                      "assignments": [
+                        84
+                      ]
                     },
                     "children": [
+                      {
+                        "attributes": {
+                          "constant": false,
+                          "name": "feeOn",
+                          "scope": 151,
+                          "stateVariable": false,
+                          "storageLocation": "default",
+                          "type": "bool",
+                          "value": null,
+                          "visibility": "internal"
+                        },
+                        "children": [
+                          {
+                            "attributes": {
+                              "name": "bool",
+                              "type": "bool"
+                            },
+                            "id": 83,
+                            "name": "ElementaryTypeName",
+                            "src": "1668:4:0"
+                          }
+                        ],
+                        "id": 84,
+                        "name": "VariableDeclaration",
+                        "src": "1668:10:0"
+                      },
                       {
                         "attributes": {
                           "argumentTypes": null,
                           "commonType": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
+                            "typeIdentifier": "t_address",
+                            "typeString": "address"
                           },
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
-                          "operator": ">",
+                          "operator": "!=",
                           "type": "bool"
                         },
                         "children": [
@@ -4906,35 +5579,95 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 57,
-                              "type": "uint256",
-                              "value": "_fee"
+                              "referencedDeclaration": 72,
+                              "type": "address",
+                              "value": "_feeTo"
                             },
-                            "id": 77,
+                            "id": 85,
                             "name": "Identifier",
-                            "src": "1578:4:0"
+                            "src": "1681:6:0"
                           },
                           {
                             "attributes": {
                               "argumentTypes": null,
-                              "hexvalue": "30",
                               "isConstant": false,
                               "isLValue": false,
                               "isPure": true,
+                              "isStructConstructorCall": false,
                               "lValueRequested": false,
-                              "subdenomination": null,
-                              "token": "number",
-                              "type": "int_const 0",
-                              "value": "0"
+                              "names": [
+                                null
+                              ],
+                              "type": "address payable",
+                              "type_conversion": true
                             },
-                            "id": 78,
-                            "name": "Literal",
-                            "src": "1585:1:0"
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": [
+                                    {
+                                      "typeIdentifier": "t_rational_0_by_1",
+                                      "typeString": "int_const 0"
+                                    }
+                                  ],
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "type": "type(address)",
+                                  "value": "address"
+                                },
+                                "id": 86,
+                                "name": "ElementaryTypeNameExpression",
+                                "src": "1691:7:0"
+                              },
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "hexvalue": "30",
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "subdenomination": null,
+                                  "token": "number",
+                                  "type": "int_const 0",
+                                  "value": "0"
+                                },
+                                "id": 87,
+                                "name": "Literal",
+                                "src": "1699:1:0"
+                              }
+                            ],
+                            "id": 88,
+                            "name": "FunctionCall",
+                            "src": "1691:10:0"
                           }
                         ],
-                        "id": 79,
+                        "id": 89,
                         "name": "BinaryOperation",
-                        "src": "1578:8:0"
+                        "src": "1681:20:0"
+                      }
+                    ],
+                    "id": 90,
+                    "name": "VariableDeclarationStatement",
+                    "src": "1668:33:0"
+                  },
+                  {
+                    "children": [
+                      {
+                        "attributes": {
+                          "argumentTypes": null,
+                          "overloadedDeclarations": [
+                            null
+                          ],
+                          "referencedDeclaration": 84,
+                          "type": "bool",
+                          "value": "feeOn"
+                        },
+                        "id": 91,
+                        "name": "Identifier",
+                        "src": "1711:5:0"
                       },
                       {
                         "children": [
@@ -4970,13 +5703,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 226,
+                                      "referencedDeclaration": 265,
                                       "type": "function (address,uint256)",
                                       "value": "_safeErc20Transfer"
                                     },
-                                    "id": 80,
+                                    "id": 92,
                                     "name": "Identifier",
-                                    "src": "1596:18:0"
+                                    "src": "1726:18:0"
                                   },
                                   {
                                     "attributes": {
@@ -4984,47 +5717,312 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 55,
+                                      "referencedDeclaration": 64,
                                       "type": "address payable",
-                                      "value": "_relayer"
+                                      "value": "_recipient"
                                     },
-                                    "id": 81,
+                                    "id": 93,
                                     "name": "Identifier",
-                                    "src": "1615:8:0"
+                                    "src": "1745:10:0"
                                   },
                                   {
                                     "attributes": {
                                       "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 57,
-                                      "type": "uint256",
-                                      "value": "_fee"
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
                                     },
-                                    "id": 82,
-                                    "name": "Identifier",
-                                    "src": "1625:4:0"
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "commonType": {
+                                            "typeIdentifier": "t_uint256",
+                                            "typeString": "uint256"
+                                          },
+                                          "isConstant": false,
+                                          "isLValue": false,
+                                          "isPure": false,
+                                          "lValueRequested": false,
+                                          "operator": "-",
+                                          "type": "uint256"
+                                        },
+                                        "children": [
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 660,
+                                              "type": "uint256",
+                                              "value": "denomination"
+                                            },
+                                            "id": 94,
+                                            "name": "Identifier",
+                                            "src": "1757:12:0"
+                                          },
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 68,
+                                              "type": "uint256",
+                                              "value": "_relayer_fee"
+                                            },
+                                            "id": 95,
+                                            "name": "Identifier",
+                                            "src": "1772:12:0"
+                                          }
+                                        ],
+                                        "id": 96,
+                                        "name": "BinaryOperation",
+                                        "src": "1757:27:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 8,
+                                          "type": "uint256",
+                                          "value": "protocolFee"
+                                        },
+                                        "id": 97,
+                                        "name": "Identifier",
+                                        "src": "1787:11:0"
+                                      }
+                                    ],
+                                    "id": 98,
+                                    "name": "BinaryOperation",
+                                    "src": "1757:41:0"
                                   }
                                 ],
-                                "id": 83,
+                                "id": 99,
                                 "name": "FunctionCall",
-                                "src": "1596:34:0"
+                                "src": "1726:73:0"
                               }
                             ],
-                            "id": 84,
+                            "id": 100,
                             "name": "ExpressionStatement",
-                            "src": "1596:34:0"
+                            "src": "1726:73:0"
+                          },
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address",
+                                          "typeString": "address"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 101,
+                                    "name": "Identifier",
+                                    "src": "1807:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 72,
+                                      "type": "address",
+                                      "value": "_feeTo"
+                                    },
+                                    "id": 102,
+                                    "name": "Identifier",
+                                    "src": "1826:6:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 8,
+                                      "type": "uint256",
+                                      "value": "protocolFee"
+                                    },
+                                    "id": 103,
+                                    "name": "Identifier",
+                                    "src": "1834:11:0"
+                                  }
+                                ],
+                                "id": 104,
+                                "name": "FunctionCall",
+                                "src": "1807:39:0"
+                              }
+                            ],
+                            "id": 105,
+                            "name": "ExpressionStatement",
+                            "src": "1807:39:0"
                           }
                         ],
-                        "id": 85,
+                        "id": 106,
                         "name": "Block",
-                        "src": "1588:49:0"
+                        "src": "1718:135:0"
+                      },
+                      {
+                        "children": [
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 107,
+                                    "name": "Identifier",
+                                    "src": "1867:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 64,
+                                      "type": "address payable",
+                                      "value": "_recipient"
+                                    },
+                                    "id": 108,
+                                    "name": "Identifier",
+                                    "src": "1886:10:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
+                                    },
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 660,
+                                          "type": "uint256",
+                                          "value": "denomination"
+                                        },
+                                        "id": 109,
+                                        "name": "Identifier",
+                                        "src": "1898:12:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 68,
+                                          "type": "uint256",
+                                          "value": "_relayer_fee"
+                                        },
+                                        "id": 110,
+                                        "name": "Identifier",
+                                        "src": "1913:12:0"
+                                      }
+                                    ],
+                                    "id": 111,
+                                    "name": "BinaryOperation",
+                                    "src": "1898:27:0"
+                                  }
+                                ],
+                                "id": 112,
+                                "name": "FunctionCall",
+                                "src": "1867:59:0"
+                              }
+                            ],
+                            "id": 113,
+                            "name": "ExpressionStatement",
+                            "src": "1867:59:0"
+                          }
+                        ],
+                        "id": 114,
+                        "name": "Block",
+                        "src": "1859:74:0"
                       }
                     ],
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                   },
                   {
                     "attributes": {
@@ -5052,13 +6050,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 59,
+                              "referencedDeclaration": 68,
                               "type": "uint256",
-                              "value": "_refund"
+                              "value": "_relayer_fee"
                             },
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+                            "id": 116,
                             "name": "Identifier",
-                            "src": "1647:7:0"
+                            "src": "1943:12:0"
                           },
                           {
                             "attributes": {
@@ -5073,21 +6071,167 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 88,
+                            "id": 117,
                             "name": "Literal",
-                            "src": "1657:1:0"
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                           }
                         ],
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+                        "id": 118,
                         "name": "BinaryOperation",
-                        "src": "1647:11:0"
+                        "src": "1943:16:0"
+                      },
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+                          {
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+                                  "isPure": false,
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+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 119,
+                                    "name": "Identifier",
+                                    "src": "1969:18:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 66,
+                                      "type": "address payable",
+                                      "value": "_relayer"
+                                    },
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+                                    "name": "Identifier",
+                                    "src": "1988:8:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 68,
+                                      "type": "uint256",
+                                      "value": "_relayer_fee"
+                                    },
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+                                    "name": "Identifier",
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+                                  }
+                                ],
+                                "id": 122,
+                                "name": "FunctionCall",
+                                "src": "1969:42:0"
+                              }
+                            ],
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+                            "name": "ExpressionStatement",
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+                          "commonType": {
+                            "typeIdentifier": "t_uint256",
+                            "typeString": "uint256"
+                          },
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+                          "isLValue": false,
+                          "isPure": false,
+                          "lValueRequested": false,
+                          "operator": ">",
+                          "type": "bool"
+                        },
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+                              "overloadedDeclarations": [
+                                null
+                              ],
+                              "referencedDeclaration": 70,
+                              "type": "uint256",
+                              "value": "_refund"
+                            },
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+                            "name": "Identifier",
+                            "src": "2028:7:0"
+                          },
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+                              "hexvalue": "30",
+                              "isConstant": false,
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+                              "lValueRequested": false,
+                              "subdenomination": null,
+                              "token": "number",
+                              "type": "int_const 0",
+                              "value": "0"
+                            },
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+                            "name": "Literal",
+                            "src": "2038:1:0"
+                          }
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+                        "name": "BinaryOperation",
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                       {
                         "children": [
                           {
                             "attributes": {
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@@ -5096,7 +6240,7 @@
                                 "attributes": {
                                   "constant": false,
                                   "name": "success",
-                                  "scope": 110,
+                                  "scope": 149,
                                   "stateVariable": false,
                                   "storageLocation": "default",
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@@ -5109,14 +6253,14 @@
                                       "name": "bool",
                                       "type": "bool"
                                     },
-                                    "id": 90,
+                                    "id": 129,
                                     "name": "ElementaryTypeName",
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                                 "name": "VariableDeclaration",
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@@ -5188,23 +6332,23 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 53,
+                                                  "referencedDeclaration": 64,
                                                   "type": "address payable",
                                                   "value": "_recipient"
                                                 },
-                                                "id": 92,
+                                                "id": 131,
                                                 "name": "Identifier",
-                                                "src": "1687:10:0"
+                                                "src": "2068:10:0"
                                               }
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                                             "name": "MemberAccess",
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                                         "name": "MemberAccess",
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@@ -5212,18 +6356,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
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                                           "type": "uint256",
                                           "value": "_refund"
                                         },
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                                         "name": "Identifier",
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@@ -5238,19 +6382,19 @@
                                       "type": "literal_string \"\"",
                                       "value": ""
                                     },
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                                     "name": "Literal",
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+                                    "src": "2099:2:0"
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                                 "name": "FunctionCall",
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                             "name": "VariableDeclarationStatement",
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@@ -5275,18 +6419,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
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                                       "type": "bool",
                                       "value": "success"
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                                     "name": "Identifier",
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                                 "name": "UnaryOperation",
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@@ -5330,18 +6474,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
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+                                                  "referencedDeclaration": 66,
                                                   "type": "address payable",
                                                   "value": "_relayer"
                                                 },
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+                                                "id": 141,
                                                 "name": "Identifier",
-                                                "src": "1805:8:0"
+                                                "src": "2186:8:0"
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+                                            "id": 143,
                                             "name": "MemberAccess",
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@@ -5349,53 +6493,53 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 59,
+                                              "referencedDeclaration": 70,
                                               "type": "uint256",
                                               "value": "_refund"
                                             },
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                                             "name": "Identifier",
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+                                            "src": "2204:7:0"
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                                       }
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                                 "name": "Block",
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                             ],
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                             "name": "IfStatement",
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+                            "src": "2110:111:0"
                           }
                         ],
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                         "name": "Block",
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                 ],
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           {
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@@ -5407,7 +6551,7 @@
                 null
               ],
               "name": "_safeErc20TransferFrom",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
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               "visibility": "internal"
@@ -5419,7 +6563,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_from",
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5433,20 +6577,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 114,
+                        "id": 153,
                         "name": "ElementaryTypeName",
-                        "src": "1886:7:0"
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                     ],
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-                    "src": "1886:13:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_to",
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                       "type": "address",
@@ -5460,20 +6604,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 116,
+                        "id": 155,
                         "name": "ElementaryTypeName",
-                        "src": "1901:7:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 171,
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5486,19 +6630,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 118,
+                        "id": 157,
                         "name": "ElementaryTypeName",
-                        "src": "1914:7:0"
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@@ -5507,17 +6651,17 @@
                   ]
                 },
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                 "name": "ParameterList",
-                "src": "1940:0:0"
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               {
                 "children": [
                   {
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-                        123,
-                        125
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@@ -5525,7 +6669,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 170,
+                          "scope": 209,
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                           "storageLocation": "default",
                           "type": "bool",
@@ -5538,20 +6682,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 122,
+                            "id": 161,
                             "name": "ElementaryTypeName",
-                            "src": "1947:4:0"
+                            "src": "2328:4:0"
                           }
                         ],
-                        "id": 123,
+                        "id": 162,
                         "name": "VariableDeclaration",
-                        "src": "1947:12:0"
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                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 170,
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                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -5564,14 +6708,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 124,
+                            "id": 163,
                             "name": "ElementaryTypeName",
-                            "src": "1961:5:0"
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                         ],
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                         "name": "VariableDeclaration",
-                        "src": "1961:17:0"
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                         "attributes": {
@@ -5615,14 +6759,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 126,
+                                "id": 165,
                                 "name": "Identifier",
-                                "src": "1982:5:0"
+                                "src": "2363:5:0"
                               }
                             ],
-                            "id": 127,
+                            "id": 166,
                             "name": "MemberAccess",
-                            "src": "1982:10:0"
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                           {
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@@ -5674,18 +6818,18 @@
                                       "overloadedDeclarations": [
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-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
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                                       "value": "abi"
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+                                    "id": 167,
                                     "name": "Identifier",
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+                                "id": 168,
                                 "name": "MemberAccess",
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@@ -5700,9 +6844,9 @@
                                   "type": "int_const 599290589",
                                   "value": "0x23b872dd"
                                 },
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                                 "name": "Literal",
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@@ -5710,13 +6854,13 @@
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-                                  "referencedDeclaration": 115,
+                                  "referencedDeclaration": 154,
                                   "type": "address",
                                   "value": "_from"
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+                                "id": 170,
                                 "name": "Identifier",
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@@ -5724,13 +6868,13 @@
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                                 "name": "Identifier",
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                                 "attributes": {
@@ -5738,28 +6882,28 @@
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+                                  "referencedDeclaration": 158,
                                   "type": "uint256",
                                   "value": "_amount"
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                                 "name": "Identifier",
-                                "src": "2059:7:0"
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@@ -5791,16 +6935,16 @@
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                               "value": "require"
                             },
-                            "id": 137,
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                             "name": "Identifier",
-                            "src": "2074:7:0"
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@@ -5808,13 +6952,13 @@
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                             "name": "Identifier",
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@@ -5829,19 +6973,19 @@
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@@ -5881,18 +7025,18 @@
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                             "name": "MemberAccess",
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@@ -5907,14 +7051,14 @@
                               "type": "int_const 0",
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@@ -5948,16 +7092,16 @@
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+                                        1019
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+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 146,
+                                    "id": 185,
                                     "name": "Identifier",
-                                    "src": "2244:7:0"
+                                    "src": "2625:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -5992,18 +7136,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 125,
+                                              "referencedDeclaration": 164,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 147,
+                                            "id": 186,
                                             "name": "Identifier",
-                                            "src": "2252:4:0"
+                                            "src": "2633:4:0"
                                           }
                                         ],
-                                        "id": 148,
+                                        "id": 187,
                                         "name": "MemberAccess",
-                                        "src": "2252:11:0"
+                                        "src": "2633:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6018,14 +7162,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 149,
+                                        "id": 188,
                                         "name": "Literal",
-                                        "src": "2267:2:0"
+                                        "src": "2648:2:0"
                                       }
                                     ],
-                                    "id": 150,
+                                    "id": 189,
                                     "name": "BinaryOperation",
-                                    "src": "2252:17:0"
+                                    "src": "2633:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6040,19 +7184,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 151,
+                                    "id": 190,
                                     "name": "Literal",
-                                    "src": "2271:44:0"
+                                    "src": "2652:44:0"
                                   }
                                 ],
-                                "id": 152,
+                                "id": 191,
                                 "name": "FunctionCall",
-                                "src": "2244:72:0"
+                                "src": "2625:72:0"
                               }
                             ],
-                            "id": 153,
+                            "id": 192,
                             "name": "ExpressionStatement",
-                            "src": "2244:72:0"
+                            "src": "2625:72:0"
                           },
                           {
                             "children": [
@@ -6073,13 +7217,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 154,
+                                    "id": 193,
                                     "name": "Identifier",
-                                    "src": "2324:7:0"
+                                    "src": "2705:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6123,18 +7267,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 155,
+                                            "id": 194,
                                             "name": "Identifier",
-                                            "src": "2334:3:0"
+                                            "src": "2715:3:0"
                                           }
                                         ],
-                                        "id": 156,
+                                        "id": 195,
                                         "name": "MemberAccess",
-                                        "src": "2334:10:0"
+                                        "src": "2715:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6142,13 +7286,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 125,
+                                          "referencedDeclaration": 164,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 157,
+                                        "id": 196,
                                         "name": "Identifier",
-                                        "src": "2345:4:0"
+                                        "src": "2726:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -6171,29 +7315,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 158,
+                                            "id": 197,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2352:4:0"
+                                            "src": "2733:4:0"
                                           }
                                         ],
-                                        "id": 159,
+                                        "id": 198,
                                         "name": "TupleExpression",
-                                        "src": "2351:6:0"
+                                        "src": "2732:6:0"
                                       }
                                     ],
-                                    "id": 160,
+                                    "id": 199,
                                     "name": "FunctionCall",
-                                    "src": "2334:24:0"
+                                    "src": "2715:24:0"
                                   }
                                 ],
-                                "id": 161,
+                                "id": 200,
                                 "name": "Assignment",
-                                "src": "2324:34:0"
+                                "src": "2705:34:0"
                               }
                             ],
-                            "id": 162,
+                            "id": 201,
                             "name": "ExpressionStatement",
-                            "src": "2324:34:0"
+                            "src": "2705:34:0"
                           },
                           {
                             "children": [
@@ -6225,16 +7369,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 163,
+                                    "id": 202,
                                     "name": "Identifier",
-                                    "src": "2366:7:0"
+                                    "src": "2747:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6242,13 +7386,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 164,
+                                    "id": 203,
                                     "name": "Identifier",
-                                    "src": "2374:7:0"
+                                    "src": "2755:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6263,39 +7407,39 @@
                                       "type": "literal_string \"not enough allowed tokens. Token returns false.\"",
                                       "value": "not enough allowed tokens. Token returns false."
                                     },
-                                    "id": 165,
+                                    "id": 204,
                                     "name": "Literal",
-                                    "src": "2383:49:0"
+                                    "src": "2764:49:0"
                                   }
                                 ],
-                                "id": 166,
+                                "id": 205,
                                 "name": "FunctionCall",
-                                "src": "2366:67:0"
+                                "src": "2747:67:0"
                               }
                             ],
-                            "id": 167,
+                            "id": 206,
                             "name": "ExpressionStatement",
-                            "src": "2366:67:0"
+                            "src": "2747:67:0"
                           }
                         ],
-                        "id": 168,
+                        "id": 207,
                         "name": "Block",
-                        "src": "2236:204:0"
+                        "src": "2617:204:0"
                       }
                     ],
-                    "id": 169,
+                    "id": 208,
                     "name": "IfStatement",
-                    "src": "2215:225:0"
+                    "src": "2596:225:0"
                   }
                 ],
-                "id": 170,
+                "id": 209,
                 "name": "Block",
-                "src": "1940:504:0"
+                "src": "2321:504:0"
               }
             ],
-            "id": 171,
+            "id": 210,
             "name": "FunctionDefinition",
-            "src": "1854:590:0"
+            "src": "2235:590:0"
           },
           {
             "attributes": {
@@ -6307,7 +7451,7 @@
                 null
               ],
               "name": "_safeErc20Transfer",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6319,7 +7463,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_to",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -6333,20 +7477,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 172,
+                        "id": 211,
                         "name": "ElementaryTypeName",
-                        "src": "2476:7:0"
+                        "src": "2857:7:0"
                       }
                     ],
-                    "id": 173,
+                    "id": 212,
                     "name": "VariableDeclaration",
-                    "src": "2476:11:0"
+                    "src": "2857:11:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6359,19 +7503,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 174,
+                        "id": 213,
                         "name": "ElementaryTypeName",
-                        "src": "2489:7:0"
+                        "src": "2870:7:0"
                       }
                     ],
-                    "id": 175,
+                    "id": 214,
                     "name": "VariableDeclaration",
-                    "src": "2489:15:0"
+                    "src": "2870:15:0"
                   }
                 ],
-                "id": 176,
+                "id": 215,
                 "name": "ParameterList",
-                "src": "2475:30:0"
+                "src": "2856:30:0"
               },
               {
                 "attributes": {
@@ -6380,17 +7524,17 @@
                   ]
                 },
                 "children": [],
-                "id": 177,
+                "id": 216,
                 "name": "ParameterList",
-                "src": "2515:0:0"
+                "src": "2896:0:0"
               },
               {
                 "children": [
                   {
                     "attributes": {
                       "assignments": [
-                        179,
-                        181
+                        218,
+                        220
                       ]
                     },
                     "children": [
@@ -6398,7 +7542,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "bool",
@@ -6411,20 +7555,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 178,
+                            "id": 217,
                             "name": "ElementaryTypeName",
-                            "src": "2522:4:0"
+                            "src": "2903:4:0"
                           }
                         ],
-                        "id": 179,
+                        "id": 218,
                         "name": "VariableDeclaration",
-                        "src": "2522:12:0"
+                        "src": "2903:12:0"
                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -6437,14 +7581,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 180,
+                            "id": 219,
                             "name": "ElementaryTypeName",
-                            "src": "2536:5:0"
+                            "src": "2917:5:0"
                           }
                         ],
-                        "id": 181,
+                        "id": 220,
                         "name": "VariableDeclaration",
-                        "src": "2536:17:0"
+                        "src": "2917:17:0"
                       },
                       {
                         "attributes": {
@@ -6488,14 +7632,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 182,
+                                "id": 221,
                                 "name": "Identifier",
-                                "src": "2557:5:0"
+                                "src": "2938:5:0"
                               }
                             ],
-                            "id": 183,
+                            "id": 222,
                             "name": "MemberAccess",
-                            "src": "2557:10:0"
+                            "src": "2938:10:0"
                           },
                           {
                             "attributes": {
@@ -6543,18 +7687,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
                                       "type": "abi",
                                       "value": "abi"
                                     },
-                                    "id": 184,
+                                    "id": 223,
                                     "name": "Identifier",
-                                    "src": "2568:3:0"
+                                    "src": "2949:3:0"
                                   }
                                 ],
-                                "id": 185,
+                                "id": 224,
                                 "name": "MemberAccess",
-                                "src": "2568:22:0"
+                                "src": "2949:22:0"
                               },
                               {
                                 "attributes": {
@@ -6569,9 +7713,9 @@
                                   "type": "int_const 2835717307",
                                   "value": "0xa9059cbb"
                                 },
-                                "id": 186,
+                                "id": 225,
                                 "name": "Literal",
-                                "src": "2591:10:0"
+                                "src": "2972:10:0"
                               },
                               {
                                 "attributes": {
@@ -6579,13 +7723,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 173,
+                                  "referencedDeclaration": 212,
                                   "type": "address",
                                   "value": "_to"
                                 },
-                                "id": 187,
+                                "id": 226,
                                 "name": "Identifier",
-                                "src": "2618:3:0"
+                                "src": "2999:3:0"
                               },
                               {
                                 "attributes": {
@@ -6593,28 +7737,28 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 175,
+                                  "referencedDeclaration": 214,
                                   "type": "uint256",
                                   "value": "_amount"
                                 },
-                                "id": 188,
+                                "id": 227,
                                 "name": "Identifier",
-                                "src": "2623:7:0"
+                                "src": "3004:7:0"
                               }
                             ],
-                            "id": 189,
+                            "id": 228,
                             "name": "FunctionCall",
-                            "src": "2568:63:0"
+                            "src": "2949:63:0"
                           }
                         ],
-                        "id": 190,
+                        "id": 229,
                         "name": "FunctionCall",
-                        "src": "2557:75:0"
+                        "src": "2938:75:0"
                       }
                     ],
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                     "name": "VariableDeclarationStatement",
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+                    "src": "2902:111:0"
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                   {
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@@ -6646,16 +7790,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
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-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 192,
+                            "id": 231,
                             "name": "Identifier",
-                            "src": "2638:7:0"
+                            "src": "3019:7:0"
                           },
                           {
                             "attributes": {
@@ -6663,13 +7807,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 179,
+                              "referencedDeclaration": 218,
                               "type": "bool",
                               "value": "success"
                             },
-                            "id": 193,
+                            "id": 232,
                             "name": "Identifier",
-                            "src": "2646:7:0"
+                            "src": "3027:7:0"
                           },
                           {
                             "attributes": {
@@ -6684,19 +7828,19 @@
                               "type": "literal_string \"not enough tokens\"",
                               "value": "not enough tokens"
                             },
-                            "id": 194,
+                            "id": 233,
                             "name": "Literal",
-                            "src": "2655:19:0"
+                            "src": "3036:19:0"
                           }
                         ],
-                        "id": 195,
+                        "id": 234,
                         "name": "FunctionCall",
-                        "src": "2638:37:0"
+                        "src": "3019:37:0"
                       }
                     ],
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+                    "id": 235,
                     "name": "ExpressionStatement",
-                    "src": "2638:37:0"
+                    "src": "3019:37:0"
                   },
                   {
                     "attributes": {
@@ -6736,18 +7880,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 181,
+                                  "referencedDeclaration": 220,
                                   "type": "bytes memory",
                                   "value": "data"
                                 },
-                                "id": 197,
+                                "id": 236,
                                 "name": "Identifier",
-                                "src": "2775:4:0"
+                                "src": "3156:4:0"
                               }
                             ],
-                            "id": 198,
+                            "id": 237,
                             "name": "MemberAccess",
-                            "src": "2775:11:0"
+                            "src": "3156:11:0"
                           },
                           {
                             "attributes": {
@@ -6762,14 +7906,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 199,
+                            "id": 238,
                             "name": "Literal",
-                            "src": "2789:1:0"
+                            "src": "3170:1:0"
                           }
                         ],
-                        "id": 200,
+                        "id": 239,
                         "name": "BinaryOperation",
-                        "src": "2775:15:0"
+                        "src": "3156:15:0"
                       },
                       {
                         "children": [
@@ -6803,16 +7947,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 201,
+                                    "id": 240,
                                     "name": "Identifier",
-                                    "src": "2800:7:0"
+                                    "src": "3181:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6847,18 +7991,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 181,
+                                              "referencedDeclaration": 220,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 202,
+                                            "id": 241,
                                             "name": "Identifier",
-                                            "src": "2808:4:0"
+                                            "src": "3189:4:0"
                                           }
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-                                        "id": 203,
+                                        "id": 242,
                                         "name": "MemberAccess",
-                                        "src": "2808:11:0"
+                                        "src": "3189:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6873,14 +8017,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 204,
+                                        "id": 243,
                                         "name": "Literal",
-                                        "src": "2823:2:0"
+                                        "src": "3204:2:0"
                                       }
                                     ],
-                                    "id": 205,
+                                    "id": 244,
                                     "name": "BinaryOperation",
-                                    "src": "2808:17:0"
+                                    "src": "3189:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6895,19 +8039,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 206,
+                                    "id": 245,
                                     "name": "Literal",
-                                    "src": "2827:44:0"
+                                    "src": "3208:44:0"
                                   }
                                 ],
-                                "id": 207,
+                                "id": 246,
                                 "name": "FunctionCall",
-                                "src": "2800:72:0"
+                                "src": "3181:72:0"
                               }
                             ],
-                            "id": 208,
+                            "id": 247,
                             "name": "ExpressionStatement",
-                            "src": "2800:72:0"
+                            "src": "3181:72:0"
                           },
                           {
                             "children": [
@@ -6928,13 +8072,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 209,
+                                    "id": 248,
                                     "name": "Identifier",
-                                    "src": "2880:7:0"
+                                    "src": "3261:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6978,18 +8122,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 210,
+                                            "id": 249,
                                             "name": "Identifier",
-                                            "src": "2890:3:0"
+                                            "src": "3271:3:0"
                                           }
                                         ],
-                                        "id": 211,
+                                        "id": 250,
                                         "name": "MemberAccess",
-                                        "src": "2890:10:0"
+                                        "src": "3271:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6997,13 +8141,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 181,
+                                          "referencedDeclaration": 220,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 212,
+                                        "id": 251,
                                         "name": "Identifier",
-                                        "src": "2901:4:0"
+                                        "src": "3282:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -7026,29 +8170,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 213,
+                                            "id": 252,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2908:4:0"
+                                            "src": "3289:4:0"
                                           }
                                         ],
-                                        "id": 214,
+                                        "id": 253,
                                         "name": "TupleExpression",
-                                        "src": "2907:6:0"
+                                        "src": "3288:6:0"
                                       }
                                     ],
-                                    "id": 215,
+                                    "id": 254,
                                     "name": "FunctionCall",
-                                    "src": "2890:24:0"
+                                    "src": "3271:24:0"
                                   }
                                 ],
-                                "id": 216,
+                                "id": 255,
                                 "name": "Assignment",
-                                "src": "2880:34:0"
+                                "src": "3261:34:0"
                               }
                             ],
-                            "id": 217,
+                            "id": 256,
                             "name": "ExpressionStatement",
-                            "src": "2880:34:0"
+                            "src": "3261:34:0"
                           },
                           {
                             "children": [
@@ -7080,16 +8224,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 218,
+                                    "id": 257,
                                     "name": "Identifier",
-                                    "src": "2922:7:0"
+                                    "src": "3303:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7097,13 +8241,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 219,
+                                    "id": 258,
                                     "name": "Identifier",
-                                    "src": "2930:7:0"
+                                    "src": "3311:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7118,49 +8262,49 @@
                                       "type": "literal_string \"not enough tokens. Token returns false.\"",
                                       "value": "not enough tokens. Token returns false."
                                     },
-                                    "id": 220,
+                                    "id": 259,
                                     "name": "Literal",
-                                    "src": "2939:41:0"
+                                    "src": "3320:41:0"
                                   }
                                 ],
-                                "id": 221,
+                                "id": 260,
                                 "name": "FunctionCall",
-                                "src": "2922:59:0"
+                                "src": "3303:59:0"
                               }
                             ],
-                            "id": 222,
+                            "id": 261,
                             "name": "ExpressionStatement",
-                            "src": "2922:59:0"
+                            "src": "3303:59:0"
                           }
                         ],
-                        "id": 223,
+                        "id": 262,
                         "name": "Block",
-                        "src": "2792:196:0"
+                        "src": "3173:196:0"
                       }
                     ],
-                    "id": 224,
+                    "id": 263,
                     "name": "IfStatement",
-                    "src": "2771:217:0"
+                    "src": "3152:217:0"
                   }
                 ],
-                "id": 225,
+                "id": 264,
                 "name": "Block",
-                "src": "2515:477:0"
+                "src": "2896:477:0"
               }
             ],
-            "id": 226,
+            "id": 265,
             "name": "FunctionDefinition",
-            "src": "2448:544:0"
+            "src": "2829:544:0"
           }
         ],
-        "id": 227,
+        "id": 266,
         "name": "ContractDefinition",
-        "src": "805:2189:0"
+        "src": "805:2570:0"
       }
     ],
-    "id": 228,
+    "id": 267,
     "name": "SourceUnit",
-    "src": "755:2240:0"
+    "src": "755:2621:0"
   },
   "compiler": {
     "name": "solc",
@@ -7170,14 +8314,14 @@
     "42220": {
       "events": {},
       "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
+        "Hasher": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE"
       },
-      "address": "0x89c8BB50BBa5B15B5044bdA870d1c34322B66171",
-      "transactionHash": "0xa26063a78dbf50e366559e0eaefd298963a7176b318d163a926d199dc9a1268e"
+      "address": "0xC8980dcBc56F5CEdd5356D190cB42125e16486eb",
+      "transactionHash": "0xbbd8007eb57eeeb98a12b9807e7d23d46e64b834d929967a9abf6cd0984d34bd"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:54:26.391Z",
+  "updatedAt": "2021-04-02T22:56:11.626Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {
diff --git a/client/contracts/CELOTornado.0.json b/client/contracts/CELOTornado.0.json
index aa4e953..dabb954 100644
--- a/client/contracts/CELOTornado.0.json
+++ b/client/contracts/CELOTornado.0.json
@@ -8,6 +8,11 @@
           "name": "_verifier",
           "type": "address"
         },
+        {
+          "internalType": "contract IFeeManager",
+          "name": "_feeManager",
+          "type": "address"
+        },
         {
           "internalType": "uint256",
           "name": "_denomination",
@@ -215,6 +220,21 @@
       "stateMutability": "payable",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "feeManager",
+      "outputs": [
+        {
+          "internalType": "contract IFeeManager",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -406,6 +426,21 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "protocolFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -539,21 +574,21 @@
       "type": "function"
     }
   ],
-  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x708938fd083239d2e9cd17e457cf25a2150bb900082fad58af8b689f786aef9c\",\"urls\":[\"bzz-raw://f345afd62002f883c60c032cd0cb051663dc8a3e59a52bf44109633b96cb3685\",\"dweb:/ipfs/QmNwjnH2uyNoq9GPjNUv6Z1mgtiR5rY3K7EHY74RBjXMpw\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0x09c70432243629ef44697fd3d0ca89d3578e2b1c9f46d90757371edb163c14da\",\"urls\":[\"bzz-raw://d2a2c9fa85c32cb15793282792cd25c71804a10aa5a911e41f3bcd07f5df117e\",\"dweb:/ipfs/QmeQ1s6ypNnP7fossR4x9svuuLjcSBtQ5spUTmWGZY5Ljr\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
+  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"contract IFeeManager\",\"name\":\"_feeManager\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"feeManager\",\"outputs\":[{\"internalType\":\"contract IFeeManager\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"protocolFee\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x5c57c88351063f1864166162f6f32be5aebae197a18abaef8d08d67b36440a51\",\"urls\":[\"bzz-raw://6da2d6faa828b1cad43428366d273e4aa61fc176d6541fb641028985497caa0f\",\"dweb:/ipfs/QmULz388t88hr999vUk5PidTTJwbEWGUyb3d6QGnDA6qoV\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0xe7db8acb3efcecf95c7364f447ed1764c571dbf5090fd4641fe4668a965332eb\",\"urls\":[\"bzz-raw://45e790c247c38ed8ae473e3165c1148ea10a753cf6e9f9c8742394019be2aef6\",\"dweb:/ipfs/QmaGfk1ndvqur2NvCY3TWoKuorfBVShXeykKei18GDY582\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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+  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n  uint256 public protocolFee;\n\n  constructor(\n    IVerifier _verifier,\n    IFeeManager _feeManager,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _feeManager, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n    // 0.5% fee\n    protocolFee = _denomination / 200;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _relayer_fee, uint256 _refund, address _feeTo) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    bool feeOn = _feeTo != address(0);\n    if (feeOn) {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee - protocolFee);\n      _safeErc20Transfer(_feeTo, protocolFee);\n    } else {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee);\n    }\n\n    if (_relayer_fee > 0) {\n      _safeErc20Transfer(_relayer, _relayer_fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
   "sourcePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
   "ast": {
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
     "exportedSymbols": {
       "ERC20Tornado": [
-        227
+        266
       ]
     },
-    "id": 228,
+    "id": 267,
     "nodeType": "SourceUnit",
     "nodes": [
       {
@@ -571,8 +606,8 @@
         "file": "./Tornado.sol",
         "id": 2,
         "nodeType": "ImportDirective",
-        "scope": 228,
-        "sourceUnit": 1195,
+        "scope": 267,
+        "sourceUnit": 971,
         "src": "780:23:0",
         "symbolAliases": [],
         "unitAlias": ""
@@ -586,10 +621,10 @@
               "id": 3,
               "name": "Tornado",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1194,
+              "referencedDeclaration": 970,
               "src": "830:7:0",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_Tornado_$1194",
+                "typeIdentifier": "t_contract$_Tornado_$970",
                 "typeString": "contract Tornado"
               }
             },
@@ -599,19 +634,19 @@
           }
         ],
         "contractDependencies": [
-          694,
-          1194,
-          3245
+          632,
+          970,
+          1000
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": true,
-        "id": 227,
+        "id": 266,
         "linearizedBaseContracts": [
-          227,
-          1194,
-          3245,
-          694
+          266,
+          970,
+          1000,
+          632
         ],
         "name": "ERC20Tornado",
         "nodeType": "ContractDefinition",
@@ -621,7 +656,7 @@
             "id": 6,
             "name": "token",
             "nodeType": "VariableDeclaration",
-            "scope": 227,
+            "scope": 266,
             "src": "842:20:0",
             "stateVariable": true,
             "storageLocation": "default",
@@ -643,28 +678,54 @@
             "value": null,
             "visibility": "public"
           },
+          {
+            "constant": false,
+            "id": 8,
+            "name": "protocolFee",
+            "nodeType": "VariableDeclaration",
+            "scope": 266,
+            "src": "866:26:0",
+            "stateVariable": true,
+            "storageLocation": "default",
+            "typeDescriptions": {
+              "typeIdentifier": "t_uint256",
+              "typeString": "uint256"
+            },
+            "typeName": {
+              "id": 7,
+              "name": "uint256",
+              "nodeType": "ElementaryTypeName",
+              "src": "866:7:0",
+              "typeDescriptions": {
+                "typeIdentifier": "t_uint256",
+                "typeString": "uint256"
+              }
+            },
+            "value": null,
+            "visibility": "public"
+          },
           {
             "body": {
-              "id": 29,
+              "id": 40,
               "nodeType": "Block",
-              "src": "1079:25:0",
+              "src": "1151:80:0",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 27,
+                    "id": 32,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 25,
+                      "id": 30,
                       "name": "token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
                       "referencedDeclaration": 6,
-                      "src": "1085:5:0",
+                      "src": "1157:5:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -674,31 +735,114 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 26,
+                      "id": 31,
                       "name": "_token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 16,
-                      "src": "1093:6:0",
+                      "referencedDeclaration": 20,
+                      "src": "1165:6:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1085:14:0",
+                    "src": "1157:14:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
-                  "id": 28,
+                  "id": 33,
                   "nodeType": "ExpressionStatement",
-                  "src": "1085:14:0"
+                  "src": "1157:14:0"
+                },
+                {
+                  "expression": {
+                    "argumentTypes": null,
+                    "id": 38,
+                    "isConstant": false,
+                    "isLValue": false,
+                    "isPure": false,
+                    "lValueRequested": false,
+                    "leftHandSide": {
+                      "argumentTypes": null,
+                      "id": 34,
+                      "name": "protocolFee",
+                      "nodeType": "Identifier",
+                      "overloadedDeclarations": [],
+                      "referencedDeclaration": 8,
+                      "src": "1193:11:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "nodeType": "Assignment",
+                    "operator": "=",
+                    "rightHandSide": {
+                      "argumentTypes": null,
+                      "commonType": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      },
+                      "id": 37,
+                      "isConstant": false,
+                      "isLValue": false,
+                      "isPure": false,
+                      "lValueRequested": false,
+                      "leftExpression": {
+                        "argumentTypes": null,
+                        "id": 35,
+                        "name": "_denomination",
+                        "nodeType": "Identifier",
+                        "overloadedDeclarations": [],
+                        "referencedDeclaration": 14,
+                        "src": "1207:13:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_uint256",
+                          "typeString": "uint256"
+                        }
+                      },
+                      "nodeType": "BinaryOperation",
+                      "operator": "/",
+                      "rightExpression": {
+                        "argumentTypes": null,
+                        "hexValue": "323030",
+                        "id": 36,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "kind": "number",
+                        "lValueRequested": false,
+                        "nodeType": "Literal",
+                        "src": "1223:3:0",
+                        "subdenomination": null,
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_rational_200_by_1",
+                          "typeString": "int_const 200"
+                        },
+                        "value": "200"
+                      },
+                      "src": "1207:19:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "src": "1193:33:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "id": 39,
+                  "nodeType": "ExpressionStatement",
+                  "src": "1193:33:0"
                 }
               ]
             },
             "documentation": null,
-            "id": 30,
+            "id": 41,
             "implemented": true,
             "kind": "constructor",
             "modifiers": [
@@ -706,25 +850,38 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 19,
+                    "id": 23,
                     "name": "_verifier",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 8,
-                    "src": "1016:9:0",
+                    "referencedDeclaration": 10,
+                    "src": "1075:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   {
                     "argumentTypes": null,
-                    "id": 20,
+                    "id": 24,
+                    "name": "_feeManager",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 12,
+                    "src": "1086:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  {
+                    "argumentTypes": null,
+                    "id": 25,
                     "name": "_denomination",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 10,
-                    "src": "1027:13:0",
+                    "referencedDeclaration": 14,
+                    "src": "1099:13:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -732,12 +889,12 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 21,
+                    "id": 26,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 12,
-                    "src": "1042:17:0",
+                    "referencedDeclaration": 16,
+                    "src": "1114:17:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -745,103 +902,131 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 22,
+                    "id": 27,
                     "name": "_operator",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 14,
-                    "src": "1061:9:0",
+                    "referencedDeclaration": 18,
+                    "src": "1133:9:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   }
                 ],
-                "id": 23,
+                "id": 28,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 18,
+                  "id": 22,
                   "name": "Tornado",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 1194,
-                  "src": "1008:7:0",
+                  "referencedDeclaration": 970,
+                  "src": "1067:7:0",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_Tornado_$1194_$",
+                    "typeIdentifier": "t_type$_t_contract$_Tornado_$970_$",
                     "typeString": "type(contract Tornado)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1008:63:0"
+                "src": "1067:76:0"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 17,
+              "id": 21,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 8,
+                  "id": 10,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "884:19:0",
+                  "scope": 41,
+                  "src": "914:19:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$891",
+                    "typeIdentifier": "t_contract$_IVerifier_$648",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 7,
+                    "id": 9,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 891,
-                    "src": "884:9:0",
+                    "referencedDeclaration": 648,
+                    "src": "914:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   "value": null,
                   "visibility": "internal"
                 },
-                {
-                  "constant": false,
-                  "id": 10,
-                  "name": "_denomination",
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-                  "src": "909:21:0",
-                  "stateVariable": false,
-                  "storageLocation": "default",
-                  "typeDescriptions": {
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-                    "typeString": "uint256"
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-                    "name": "uint256",
-                    "nodeType": "ElementaryTypeName",
-                    "src": "909:7:0",
-                    "typeDescriptions": {
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-                      "typeString": "uint256"
-                    }
-                  },
-                  "value": null,
-                  "visibility": "internal"
-                },
                 {
                   "constant": false,
                   "id": 12,
+                  "name": "_feeManager",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "939:23:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeString": "contract IFeeManager"
+                  },
+                  "typeName": {
+                    "contractScope": null,
+                    "id": 11,
+                    "name": "IFeeManager",
+                    "nodeType": "UserDefinedTypeName",
+                    "referencedDeclaration": 654,
+                    "src": "939:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
+                {
+                  "constant": false,
+                  "id": 14,
+                  "name": "_denomination",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "968:21:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_uint256",
+                    "typeString": "uint256"
+                  },
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+                    "name": "uint256",
+                    "nodeType": "ElementaryTypeName",
+                    "src": "968:7:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
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+                  "id": 16,
                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "936:24:0",
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+                  "src": "995:24:0",
                   "stateVariable": false,
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@@ -849,10 +1034,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 11,
+                    "id": 15,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "936:6:0",
+                    "src": "995:6:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -863,11 +1048,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 14,
+                  "id": 18,
                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "966:17:0",
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+                  "src": "1025:17:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -875,10 +1060,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 13,
+                    "id": 17,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "966:7:0",
+                    "src": "1025:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -890,11 +1075,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 16,
+                  "id": 20,
                   "name": "_token",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "989:14:0",
+                  "scope": 41,
+                  "src": "1048:14:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -902,10 +1087,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 15,
+                    "id": 19,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "989:7:0",
+                    "src": "1048:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -916,25 +1101,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "878:129:0"
+              "src": "908:158:0"
             },
             "returnParameters": {
-              "id": 24,
+              "id": 29,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1079:0:0"
+              "src": "1151:0:0"
             },
-            "scope": 227,
-            "src": "867:237:0",
+            "scope": 266,
+            "src": "897:334:0",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 50,
+              "id": 61,
               "nodeType": "Block",
-              "src": "1144:155:0",
+              "src": "1271:155:0",
               "statements": [
                 {
                   "expression": {
@@ -946,7 +1131,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 37,
+                        "id": 48,
                         "isConstant": false,
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@@ -955,18 +1140,18 @@
                           "argumentTypes": null,
                           "expression": {
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-                            "id": 34,
+                            "id": 45,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1158:3:0",
+                            "referencedDeclaration": 1015,
+                            "src": "1285:3:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 35,
+                          "id": 46,
                           "isConstant": false,
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@@ -974,7 +1159,7 @@
                           "memberName": "value",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "1158:9:0",
+                          "src": "1285:9:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -985,14 +1170,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 36,
+                          "id": 47,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1171:1:0",
+                          "src": "1298:1:0",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -1000,7 +1185,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1158:14:0",
+                        "src": "1285:14:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1009,14 +1194,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4554482076616c756520697320737570706f73656420746f206265203020666f7220455243323020696e7374616e6365",
-                        "id": 38,
+                        "id": 49,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1174:50:0",
+                        "src": "1301:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_b14b0818f1fdc710b92ba7e1ce725992b43e47a5b220b1b890f352eeac2e1d5e",
@@ -1036,21 +1221,21 @@
                           "typeString": "literal_string \"ETH value is supposed to be 0 for ERC20 instance\""
                         }
                       ],
-                      "id": 33,
+                      "id": 44,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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-                        3264
+                        1018,
+                        1019
                       ],
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-                      "src": "1150:7:0",
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+                      "src": "1277:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 39,
+                    "id": 50,
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@@ -1058,15 +1243,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1150:75:0",
+                    "src": "1277:75:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 40,
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                   "nodeType": "ExpressionStatement",
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                   "expression": {
@@ -1076,18 +1261,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 42,
+                          "id": 53,
                           "name": "msg",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 3260,
-                          "src": "1254:3:0",
+                          "referencedDeclaration": 1015,
+                          "src": "1381:3:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_message",
                             "typeString": "msg"
                           }
                         },
-                        "id": 43,
+                        "id": 54,
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@@ -1095,7 +1280,7 @@
                         "memberName": "sender",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "1254:10:0",
+                        "src": "1381:10:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -1106,14 +1291,14 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 45,
+                            "id": 56,
                             "name": "this",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3284,
-                            "src": "1274:4:0",
+                            "referencedDeclaration": 1041,
+                            "src": "1401:4:0",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           }
@@ -1121,24 +1306,24 @@
                         "expression": {
                           "argumentTypes": [
                             {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           ],
-                          "id": 44,
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                           "isConstant": false,
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                           "isPure": true,
                           "lValueRequested": false,
                           "nodeType": "ElementaryTypeNameExpression",
-                          "src": "1266:7:0",
+                          "src": "1393:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_type$_t_address_$",
                             "typeString": "type(address)"
                           },
                           "typeName": "address"
                         },
-                        "id": 46,
+                        "id": 57,
                         "isConstant": false,
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@@ -1146,7 +1331,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "1266:13:0",
+                        "src": "1393:13:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -1154,12 +1339,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 47,
+                        "id": 58,
                         "name": "denomination",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 897,
-                        "src": "1281:12:0",
+                        "referencedDeclaration": 660,
+                        "src": "1408:12:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1181,18 +1366,18 @@
                           "typeString": "uint256"
                         }
                       ],
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+                      "id": 52,
                       "name": "_safeErc20TransferFrom",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 171,
-                      "src": "1231:22:0",
+                      "referencedDeclaration": 210,
+                      "src": "1358:22:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,address,uint256)"
                       }
                     },
-                    "id": 48,
+                    "id": 59,
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@@ -1200,48 +1385,48 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1231:63:0",
+                    "src": "1358:63:0",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
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+                  "src": "1358:63:0"
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             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
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+              "id": 42,
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-              "src": "1132:2:0"
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+            "src": "1235:191:0",
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@@ -1253,7 +1438,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
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@@ -1262,18 +1447,18 @@
                           "argumentTypes": null,
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-                            "id": 63,
+                            "id": 76,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1437:3:0",
+                            "referencedDeclaration": 1015,
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                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
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@@ -1281,7 +1466,7 @@
                           "memberName": "value",
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                           "referencedDeclaration": null,
-                          "src": "1437:9:0",
+                          "src": "1588:9:0",
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                             "typeString": "uint256"
@@ -1291,18 +1476,18 @@
                         "operator": "==",
                         "rightExpression": {
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-                          "id": 65,
+                          "id": 78,
                           "name": "_refund",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 59,
-                          "src": "1450:7:0",
+                          "referencedDeclaration": 70,
+                          "src": "1601:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "1437:20:0",
+                        "src": "1588:20:0",
                         "typeDescriptions": {
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                           "typeString": "bool"
@@ -1311,14 +1496,14 @@
                       {
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                         "hexValue": "496e636f727265637420726566756e6420616d6f756e742072656365697665642062792074686520636f6e7472616374",
-                        "id": 67,
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1459:50:0",
+                        "src": "1610:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_3189ced290ffd29dc422911cd3b29574f21c524c91f4b41e6abb0646c581cbff",
@@ -1338,21 +1523,21 @@
                           "typeString": "literal_string \"Incorrect refund amount received by the contract\""
                         }
                       ],
-                      "id": 62,
+                      "id": 75,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1018,
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+                      "src": "1580:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
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                     },
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@@ -1360,178 +1545,158 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1429:81:0",
+                    "src": "1580:81:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 69,
+                  "id": 82,
                   "nodeType": "ExpressionStatement",
-                  "src": "1429:81:0"
+                  "src": "1580:81:0"
                 },
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-                    "arguments": [
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-                        "argumentTypes": null,
-                        "id": 71,
-                        "name": "_recipient",
-                        "nodeType": "Identifier",
-                        "overloadedDeclarations": [],
-                        "referencedDeclaration": 53,
-                        "src": "1536:10:0",
+                  "assignments": [
+                    84
+                  ],
+                  "declarations": [
+                    {
+                      "constant": false,
+                      "id": 84,
+                      "name": "feeOn",
+                      "nodeType": "VariableDeclaration",
+                      "scope": 151,
+                      "src": "1668:10:0",
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_bool",
+                        "typeString": "bool"
+                      },
+                      "typeName": {
+                        "id": 83,
+                        "name": "bool",
+                        "nodeType": "ElementaryTypeName",
+                        "src": "1668:4:0",
                         "typeDescriptions": {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
+                          "typeIdentifier": "t_bool",
+                          "typeString": "bool"
                         }
                       },
-                      {
-                        "argumentTypes": null,
-                        "commonType": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        },
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-                        "isPure": false,
-                        "lValueRequested": false,
-                        "leftExpression": {
-                          "argumentTypes": null,
-                          "id": 72,
-                          "name": "denomination",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 897,
-                          "src": "1548:12:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "nodeType": "BinaryOperation",
-                        "operator": "-",
-                        "rightExpression": {
-                          "argumentTypes": null,
-                          "id": 73,
-                          "name": "_fee",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 57,
-                          "src": "1563:4:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "src": "1548:19:0",
-                        "typeDescriptions": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      }
-                    ],
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-                      "argumentTypes": [
-                        {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
-                        },
-                        {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      ],
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-                      "src": "1517:18:0",
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-                        "typeString": "function (address,uint256)"
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-                    "src": "1517:51:0",
-                    "typeDescriptions": {
-                      "typeIdentifier": "t_tuple$__$",
-                      "typeString": "tuple()"
+                      "value": null,
+                      "visibility": "internal"
                     }
-                  },
-                  "id": 76,
-                  "nodeType": "ExpressionStatement",
-                  "src": "1517:51:0"
-                },
-                {
-                  "condition": {
+                  ],
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+                  "initialValue": {
                     "argumentTypes": null,
                     "commonType": {
-                      "typeIdentifier": "t_uint256",
-                      "typeString": "uint256"
+                      "typeIdentifier": "t_address",
+                      "typeString": "address"
                     },
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+                    "id": 89,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 77,
-                      "name": "_fee",
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+                      "name": "_feeTo",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 57,
-                      "src": "1578:4:0",
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+                      "src": "1681:6:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_uint256",
-                        "typeString": "uint256"
+                        "typeIdentifier": "t_address",
+                        "typeString": "address"
                       }
                     },
                     "nodeType": "BinaryOperation",
-                    "operator": ">",
+                    "operator": "!=",
                     "rightExpression": {
                       "argumentTypes": null,
-                      "hexValue": "30",
-                      "id": 78,
+                      "arguments": [
+                        {
+                          "argumentTypes": null,
+                          "hexValue": "30",
+                          "id": 87,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": true,
+                          "kind": "number",
+                          "lValueRequested": false,
+                          "nodeType": "Literal",
+                          "src": "1699:1:0",
+                          "subdenomination": null,
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          },
+                          "value": "0"
+                        }
+                      ],
+                      "expression": {
+                        "argumentTypes": [
+                          {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          }
+                        ],
+                        "id": 86,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "lValueRequested": false,
+                        "nodeType": "ElementaryTypeNameExpression",
+                        "src": "1691:7:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_type$_t_address_$",
+                          "typeString": "type(address)"
+                        },
+                        "typeName": "address"
+                      },
+                      "id": 88,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
-                      "kind": "number",
+                      "kind": "typeConversion",
                       "lValueRequested": false,
-                      "nodeType": "Literal",
-                      "src": "1585:1:0",
-                      "subdenomination": null,
+                      "names": [],
+                      "nodeType": "FunctionCall",
+                      "src": "1691:10:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_rational_0_by_1",
-                        "typeString": "int_const 0"
-                      },
-                      "value": "0"
+                        "typeIdentifier": "t_address_payable",
+                        "typeString": "address payable"
+                      }
                     },
-                    "src": "1578:8:0",
+                    "src": "1681:20:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
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-                  "id": 86,
-                  "nodeType": "IfStatement",
-                  "src": "1574:63:0",
-                  "trueBody": {
-                    "id": 85,
+                  "nodeType": "VariableDeclarationStatement",
+                  "src": "1668:33:0"
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "id": 91,
+                    "name": "feeOn",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 84,
+                    "src": "1711:5:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_bool",
+                      "typeString": "bool"
+                    }
+                  },
+                  "falseBody": {
+                    "id": 114,
                     "nodeType": "Block",
-                    "src": "1588:49:0",
+                    "src": "1859:74:0",
                     "statements": [
                       {
                         "expression": {
@@ -1539,12 +1704,12 @@
                           "arguments": [
                             {
                               "argumentTypes": null,
-                              "id": 81,
-                              "name": "_relayer",
+                              "id": 108,
+                              "name": "_recipient",
                               "nodeType": "Identifier",
                               "overloadedDeclarations": [],
-                              "referencedDeclaration": 55,
-                              "src": "1615:8:0",
+                              "referencedDeclaration": 64,
+                              "src": "1886:10:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_address_payable",
                                 "typeString": "address payable"
@@ -1552,12 +1717,44 @@
                             },
                             {
                               "argumentTypes": null,
-                              "id": 82,
-                              "name": "_fee",
-                              "nodeType": "Identifier",
-                              "overloadedDeclarations": [],
-                              "referencedDeclaration": 57,
-                              "src": "1625:4:0",
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 111,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "id": 109,
+                                "name": "denomination",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 660,
+                                "src": "1898:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 110,
+                                "name": "_relayer_fee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 68,
+                                "src": "1913:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1898:27:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_uint256",
                                 "typeString": "uint256"
@@ -1575,18 +1772,18 @@
                                 "typeString": "uint256"
                               }
                             ],
-                            "id": 80,
+                            "id": 107,
                             "name": "_safeErc20Transfer",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 226,
-                            "src": "1596:18:0",
+                            "referencedDeclaration": 265,
+                            "src": "1867:18:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
                               "typeString": "function (address,uint256)"
                             }
                           },
-                          "id": 83,
+                          "id": 112,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -1594,15 +1791,231 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "1596:34:0",
+                          "src": "1867:59:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_tuple$__$",
                             "typeString": "tuple()"
                           }
                         },
-                        "id": 84,
+                        "id": 113,
                         "nodeType": "ExpressionStatement",
-                        "src": "1596:34:0"
+                        "src": "1867:59:0"
+                      }
+                    ]
+                  },
+                  "id": 115,
+                  "nodeType": "IfStatement",
+                  "src": "1707:226:0",
+                  "trueBody": {
+                    "id": 106,
+                    "nodeType": "Block",
+                    "src": "1718:135:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 93,
+                              "name": "_recipient",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 64,
+                              "src": "1745:10:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 98,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "commonType": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                },
+                                "id": 96,
+                                "isConstant": false,
+                                "isLValue": false,
+                                "isPure": false,
+                                "lValueRequested": false,
+                                "leftExpression": {
+                                  "argumentTypes": null,
+                                  "id": 94,
+                                  "name": "denomination",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 660,
+                                  "src": "1757:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "nodeType": "BinaryOperation",
+                                "operator": "-",
+                                "rightExpression": {
+                                  "argumentTypes": null,
+                                  "id": 95,
+                                  "name": "_relayer_fee",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 68,
+                                  "src": "1772:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "src": "1757:27:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 97,
+                                "name": "protocolFee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 8,
+                                "src": "1787:11:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1757:41:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 92,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1726:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 99,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1726:73:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 100,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1726:73:0"
+                      },
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 102,
+                              "name": "_feeTo",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 72,
+                              "src": "1826:6:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 103,
+                              "name": "protocolFee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 8,
+                              "src": "1834:11:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 101,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1807:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 104,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1807:39:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 105,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1807:39:0"
                       }
                     ]
                   }
@@ -1614,19 +2027,19 @@
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     },
-                    "id": 89,
+                    "id": 118,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 87,
-                      "name": "_refund",
+                      "id": 116,
+                      "name": "_relayer_fee",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 59,
-                      "src": "1647:7:0",
+                      "referencedDeclaration": 68,
+                      "src": "1943:12:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1637,14 +2050,14 @@
                     "rightExpression": {
                       "argumentTypes": null,
                       "hexValue": "30",
-                      "id": 88,
+                      "id": 117,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "1657:1:0",
+                      "src": "1958:1:0",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_0_by_1",
@@ -1652,34 +2065,168 @@
                       },
                       "value": "0"
                     },
-                    "src": "1647:11:0",
+                    "src": "1943:16:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
                   "falseBody": null,
-                  "id": 111,
+                  "id": 125,
                   "nodeType": "IfStatement",
-                  "src": "1643:203:0",
+                  "src": "1939:79:0",
                   "trueBody": {
-                    "id": 110,
+                    "id": 124,
                     "nodeType": "Block",
-                    "src": "1660:186:0",
+                    "src": "1961:57:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 120,
+                              "name": "_relayer",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 66,
+                              "src": "1988:8:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 121,
+                              "name": "_relayer_fee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 68,
+                              "src": "1998:12:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 119,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1969:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 122,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1969:42:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 123,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1969:42:0"
+                      }
+                    ]
+                  }
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "commonType": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
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+                        "typeString": "uint256"
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+                      "subdenomination": null,
+                      "typeDescriptions": {
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+                        "typeString": "int_const 0"
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+                      "value": "0"
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+                    "typeDescriptions": {
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                     "statements": [
                       {
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                         ],
                         "declarations": [
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                             "constant": false,
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-                            "src": "1669:12:0",
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@@ -1687,10 +2234,10 @@
                               "typeString": "bool"
                             },
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+                              "id": 129,
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@@ -1701,21 +2248,21 @@
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                               "hexValue": "",
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@@ -1734,12 +2281,12 @@
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@@ -1757,18 +2304,18 @@
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-                                  "src": "1687:10:0",
+                                  "referencedDeclaration": 64,
+                                  "src": "2068:10:0",
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                                     "typeString": "address payable"
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@@ -1776,13 +2323,13 @@
                                 "memberName": "call",
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                                 "referencedDeclaration": null,
-                                "src": "1687:15:0",
+                                "src": "2068:15:0",
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                                   "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1790,13 +2337,13 @@
                               "memberName": "value",
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                               "referencedDeclaration": null,
-                              "src": "1687:21:0",
+                              "src": "2068:21:0",
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                                 "typeString": "function (uint256) pure returns (function (bytes memory) payable returns (bool,bytes memory))"
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@@ -1804,13 +2351,13 @@
                             "lValueRequested": false,
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                             "nodeType": "FunctionCall",
-                            "src": "1687:30:0",
+                            "src": "2068:30:0",
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                               "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1818,19 +2365,19 @@
                           "lValueRequested": false,
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                           "nodeType": "FunctionCall",
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                             "typeString": "tuple(bool,bytes memory)"
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@@ -1838,15 +2385,15 @@
                           "nodeType": "UnaryOperation",
                           "operator": "!",
                           "prefix": true,
-                          "src": "1733:8:0",
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-                            "src": "1734:7:0",
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@@ -1858,13 +2405,13 @@
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@@ -1872,12 +2419,12 @@
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                                       "typeString": "uint256"
@@ -1893,18 +2440,18 @@
                                   ],
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-                                    "src": "1805:8:0",
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                                       "typeString": "address payable"
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@@ -1912,13 +2459,13 @@
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                                   "referencedDeclaration": null,
-                                  "src": "1805:17:0",
+                                  "src": "2186:17:0",
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                                     "typeString": "function (uint256)"
                                   }
                                 },
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@@ -1926,15 +2473,15 @@
                                 "lValueRequested": false,
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                                 "nodeType": "FunctionCall",
-                                "src": "1805:26:0",
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                                   "typeString": "tuple()"
                                 }
                               },
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@@ -1945,23 +2492,23 @@
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             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
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@@ -1969,10 +2516,10 @@
                     "typeString": "address payable"
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+                    "id": 63,
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@@ -1984,11 +2531,11 @@
                 },
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+                  "id": 66,
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-                  "src": "1357:24:0",
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@@ -1996,10 +2543,10 @@
                     "typeString": "address payable"
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+                    "id": 65,
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                     "stateMutability": "payable",
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@@ -2011,11 +2558,11 @@
                 },
                 {
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-                  "id": 57,
-                  "name": "_fee",
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+                  "name": "_relayer_fee",
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-                  "src": "1383:12:0",
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@@ -2023,10 +2570,10 @@
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@@ -2037,11 +2584,11 @@
                 },
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@@ -2049,10 +2596,10 @@
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                       "typeString": "uint256"
@@ -2060,41 +2607,68 @@
                   },
                   "value": null,
                   "visibility": "internal"
+                },
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+                  "name": "_feeTo",
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+                  "src": "1549:14:0",
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+                  "storageLocation": "default",
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+                    "typeString": "address"
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+                    "name": "address",
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@@ -2102,10 +2676,10 @@
                         "typeString": "bool"
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@@ -2116,11 +2690,11 @@
                     },
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@@ -2128,10 +2702,10 @@
                         "typeString": "bytes"
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@@ -2141,7 +2715,7 @@
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@@ -2151,14 +2725,14 @@
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-                            "src": "2016:10:0",
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@@ -2168,12 +2742,12 @@
                           },
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                               "typeString": "address"
@@ -2181,12 +2755,12 @@
                           },
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@@ -2194,12 +2768,12 @@
                           },
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@@ -2227,18 +2801,18 @@
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-                            "referencedDeclaration": 3247,
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+                            "referencedDeclaration": 1002,
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                             "typeDescriptions": {
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                               "typeString": "abi"
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@@ -2246,13 +2820,13 @@
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                           "referencedDeclaration": null,
-                          "src": "1993:22:0",
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -2260,7 +2834,7 @@
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-                        "src": "1993:74:0",
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                           "typeString": "bytes memory"
@@ -2276,18 +2850,18 @@
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@@ -2295,13 +2869,13 @@
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-                      "src": "1982:10:0",
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@@ -2309,14 +2883,14 @@
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@@ -3034,12 +3608,12 @@
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@@ -3063,18 +3637,18 @@
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                               "typeString": "abi"
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@@ -3082,13 +3656,13 @@
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -3096,7 +3670,7 @@
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                           "typeString": "bytes memory"
@@ -3112,18 +3686,18 @@
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@@ -3131,13 +3705,13 @@
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                         "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -3145,14 +3719,14 @@
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@@ -3160,12 +3734,12 @@
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@@ -3240,7 +3814,7 @@
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@@ -3294,20 +3868,20 @@
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@@ -3319,7 +3893,7 @@
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@@ -3373,7 +3947,7 @@
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@@ -3409,21 +3983,21 @@
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@@ -3431,32 +4005,32 @@
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@@ -3469,12 +4043,12 @@
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@@ -3485,13 +4059,13 @@
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@@ -3499,14 +4073,14 @@
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@@ -3526,18 +4100,18 @@
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@@ -3559,21 +4133,21 @@
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@@ -3644,15 +4218,15 @@
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-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -4556,20 +5286,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 54,
+                        "id": 65,
                         "name": "ElementaryTypeName",
-                        "src": "1357:15:0"
+                        "src": "1484:15:0"
                       }
                     ],
-                    "id": 55,
+                    "id": 66,
                     "name": "VariableDeclaration",
-                    "src": "1357:24:0"
+                    "src": "1484:24:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
-                      "name": "_fee",
-                      "scope": 113,
+                      "name": "_relayer_fee",
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4582,20 +5312,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 56,
+                        "id": 67,
                         "name": "ElementaryTypeName",
-                        "src": "1383:7:0"
+                        "src": "1510:7:0"
                       }
                     ],
-                    "id": 57,
+                    "id": 68,
                     "name": "VariableDeclaration",
-                    "src": "1383:12:0"
+                    "src": "1510:20:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4608,19 +5338,46 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 58,
+                        "id": 69,
                         "name": "ElementaryTypeName",
-                        "src": "1397:7:0"
+                        "src": "1532:7:0"
                       }
                     ],
-                    "id": 59,
+                    "id": 70,
                     "name": "VariableDeclaration",
-                    "src": "1397:15:0"
+                    "src": "1532:15:0"
+                  },
+                  {
+                    "attributes": {
+                      "constant": false,
+                      "name": "_feeTo",
+                      "scope": 152,
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "type": "address",
+                      "value": null,
+                      "visibility": "internal"
+                    },
+                    "children": [
+                      {
+                        "attributes": {
+                          "name": "address",
+                          "stateMutability": "nonpayable",
+                          "type": "address"
+                        },
+                        "id": 71,
+                        "name": "ElementaryTypeName",
+                        "src": "1549:7:0"
+                      }
+                    ],
+                    "id": 72,
+                    "name": "VariableDeclaration",
+                    "src": "1549:14:0"
                   }
                 ],
-                "id": 60,
+                "id": 73,
                 "name": "ParameterList",
-                "src": "1328:85:0"
+                "src": "1455:109:0"
               },
               {
                 "attributes": {
@@ -4629,9 +5386,9 @@
                   ]
                 },
                 "children": [],
-                "id": 61,
+                "id": 74,
                 "name": "ParameterList",
-                "src": "1423:0:0"
+                "src": "1574:0:0"
               },
               {
                 "children": [
@@ -4665,16 +5422,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
                               ],
-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 62,
+                            "id": 75,
                             "name": "Identifier",
-                            "src": "1429:7:0"
+                            "src": "1580:7:0"
                           },
                           {
                             "attributes": {
@@ -4709,18 +5466,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3260,
+                                      "referencedDeclaration": 1015,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 63,
+                                    "id": 76,
                                     "name": "Identifier",
-                                    "src": "1437:3:0"
+                                    "src": "1588:3:0"
                                   }
                                 ],
-                                "id": 64,
+                                "id": 77,
                                 "name": "MemberAccess",
-                                "src": "1437:9:0"
+                                "src": "1588:9:0"
                               },
                               {
                                 "attributes": {
@@ -4728,18 +5485,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 59,
+                                  "referencedDeclaration": 70,
                                   "type": "uint256",
                                   "value": "_refund"
                                 },
-                                "id": 65,
+                                "id": 78,
                                 "name": "Identifier",
-                                "src": "1450:7:0"
+                                "src": "1601:7:0"
                               }
                             ],
-                            "id": 66,
+                            "id": 79,
                             "name": "BinaryOperation",
-                            "src": "1437:20:0"
+                            "src": "1588:20:0"
                           },
                           {
                             "attributes": {
@@ -4754,149 +5511,65 @@
                               "type": "literal_string \"Incorrect refund amount received by the contract\"",
                               "value": "Incorrect refund amount received by the contract"
                             },
-                            "id": 67,
+                            "id": 80,
                             "name": "Literal",
-                            "src": "1459:50:0"
+                            "src": "1610:50:0"
                           }
                         ],
-                        "id": 68,
+                        "id": 81,
                         "name": "FunctionCall",
-                        "src": "1429:81:0"
+                        "src": "1580:81:0"
                       }
                     ],
-                    "id": 69,
+                    "id": 82,
                     "name": "ExpressionStatement",
-                    "src": "1429:81:0"
-                  },
-                  {
-                    "children": [
-                      {
-                        "attributes": {
-                          "argumentTypes": null,
-                          "isConstant": false,
-                          "isLValue": false,
-                          "isPure": false,
-                          "isStructConstructorCall": false,
-                          "lValueRequested": false,
-                          "names": [
-                            null
-                          ],
-                          "type": "tuple()",
-                          "type_conversion": false
-                        },
-                        "children": [
-                          {
-                            "attributes": {
-                              "argumentTypes": [
-                                {
-                                  "typeIdentifier": "t_address_payable",
-                                  "typeString": "address payable"
-                                },
-                                {
-                                  "typeIdentifier": "t_uint256",
-                                  "typeString": "uint256"
-                                }
-                              ],
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 226,
-                              "type": "function (address,uint256)",
-                              "value": "_safeErc20Transfer"
-                            },
-                            "id": 70,
-                            "name": "Identifier",
-                            "src": "1517:18:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 53,
-                              "type": "address payable",
-                              "value": "_recipient"
-                            },
-                            "id": 71,
-                            "name": "Identifier",
-                            "src": "1536:10:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "commonType": {
-                                "typeIdentifier": "t_uint256",
-                                "typeString": "uint256"
-                              },
-                              "isConstant": false,
-                              "isLValue": false,
-                              "isPure": false,
-                              "lValueRequested": false,
-                              "operator": "-",
-                              "type": "uint256"
-                            },
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 897,
-                                  "type": "uint256",
-                                  "value": "denomination"
-                                },
-                                "id": 72,
-                                "name": "Identifier",
-                                "src": "1548:12:0"
-                              },
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 57,
-                                  "type": "uint256",
-                                  "value": "_fee"
-                                },
-                                "id": 73,
-                                "name": "Identifier",
-                                "src": "1563:4:0"
-                              }
-                            ],
-                            "id": 74,
-                            "name": "BinaryOperation",
-                            "src": "1548:19:0"
-                          }
-                        ],
-                        "id": 75,
-                        "name": "FunctionCall",
-                        "src": "1517:51:0"
-                      }
-                    ],
-                    "id": 76,
-                    "name": "ExpressionStatement",
-                    "src": "1517:51:0"
+                    "src": "1580:81:0"
                   },
                   {
                     "attributes": {
-                      "falseBody": null
+                      "assignments": [
+                        84
+                      ]
                     },
                     "children": [
+                      {
+                        "attributes": {
+                          "constant": false,
+                          "name": "feeOn",
+                          "scope": 151,
+                          "stateVariable": false,
+                          "storageLocation": "default",
+                          "type": "bool",
+                          "value": null,
+                          "visibility": "internal"
+                        },
+                        "children": [
+                          {
+                            "attributes": {
+                              "name": "bool",
+                              "type": "bool"
+                            },
+                            "id": 83,
+                            "name": "ElementaryTypeName",
+                            "src": "1668:4:0"
+                          }
+                        ],
+                        "id": 84,
+                        "name": "VariableDeclaration",
+                        "src": "1668:10:0"
+                      },
                       {
                         "attributes": {
                           "argumentTypes": null,
                           "commonType": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
+                            "typeIdentifier": "t_address",
+                            "typeString": "address"
                           },
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
-                          "operator": ">",
+                          "operator": "!=",
                           "type": "bool"
                         },
                         "children": [
@@ -4906,35 +5579,95 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 57,
-                              "type": "uint256",
-                              "value": "_fee"
+                              "referencedDeclaration": 72,
+                              "type": "address",
+                              "value": "_feeTo"
                             },
-                            "id": 77,
+                            "id": 85,
                             "name": "Identifier",
-                            "src": "1578:4:0"
+                            "src": "1681:6:0"
                           },
                           {
                             "attributes": {
                               "argumentTypes": null,
-                              "hexvalue": "30",
                               "isConstant": false,
                               "isLValue": false,
                               "isPure": true,
+                              "isStructConstructorCall": false,
                               "lValueRequested": false,
-                              "subdenomination": null,
-                              "token": "number",
-                              "type": "int_const 0",
-                              "value": "0"
+                              "names": [
+                                null
+                              ],
+                              "type": "address payable",
+                              "type_conversion": true
                             },
-                            "id": 78,
-                            "name": "Literal",
-                            "src": "1585:1:0"
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": [
+                                    {
+                                      "typeIdentifier": "t_rational_0_by_1",
+                                      "typeString": "int_const 0"
+                                    }
+                                  ],
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "type": "type(address)",
+                                  "value": "address"
+                                },
+                                "id": 86,
+                                "name": "ElementaryTypeNameExpression",
+                                "src": "1691:7:0"
+                              },
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "hexvalue": "30",
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "subdenomination": null,
+                                  "token": "number",
+                                  "type": "int_const 0",
+                                  "value": "0"
+                                },
+                                "id": 87,
+                                "name": "Literal",
+                                "src": "1699:1:0"
+                              }
+                            ],
+                            "id": 88,
+                            "name": "FunctionCall",
+                            "src": "1691:10:0"
                           }
                         ],
-                        "id": 79,
+                        "id": 89,
                         "name": "BinaryOperation",
-                        "src": "1578:8:0"
+                        "src": "1681:20:0"
+                      }
+                    ],
+                    "id": 90,
+                    "name": "VariableDeclarationStatement",
+                    "src": "1668:33:0"
+                  },
+                  {
+                    "children": [
+                      {
+                        "attributes": {
+                          "argumentTypes": null,
+                          "overloadedDeclarations": [
+                            null
+                          ],
+                          "referencedDeclaration": 84,
+                          "type": "bool",
+                          "value": "feeOn"
+                        },
+                        "id": 91,
+                        "name": "Identifier",
+                        "src": "1711:5:0"
                       },
                       {
                         "children": [
@@ -4970,13 +5703,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 226,
+                                      "referencedDeclaration": 265,
                                       "type": "function (address,uint256)",
                                       "value": "_safeErc20Transfer"
                                     },
-                                    "id": 80,
+                                    "id": 92,
                                     "name": "Identifier",
-                                    "src": "1596:18:0"
+                                    "src": "1726:18:0"
                                   },
                                   {
                                     "attributes": {
@@ -4984,47 +5717,312 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 55,
+                                      "referencedDeclaration": 64,
                                       "type": "address payable",
-                                      "value": "_relayer"
+                                      "value": "_recipient"
                                     },
-                                    "id": 81,
+                                    "id": 93,
                                     "name": "Identifier",
-                                    "src": "1615:8:0"
+                                    "src": "1745:10:0"
                                   },
                                   {
                                     "attributes": {
                                       "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 57,
-                                      "type": "uint256",
-                                      "value": "_fee"
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
                                     },
-                                    "id": 82,
-                                    "name": "Identifier",
-                                    "src": "1625:4:0"
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "commonType": {
+                                            "typeIdentifier": "t_uint256",
+                                            "typeString": "uint256"
+                                          },
+                                          "isConstant": false,
+                                          "isLValue": false,
+                                          "isPure": false,
+                                          "lValueRequested": false,
+                                          "operator": "-",
+                                          "type": "uint256"
+                                        },
+                                        "children": [
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 660,
+                                              "type": "uint256",
+                                              "value": "denomination"
+                                            },
+                                            "id": 94,
+                                            "name": "Identifier",
+                                            "src": "1757:12:0"
+                                          },
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 68,
+                                              "type": "uint256",
+                                              "value": "_relayer_fee"
+                                            },
+                                            "id": 95,
+                                            "name": "Identifier",
+                                            "src": "1772:12:0"
+                                          }
+                                        ],
+                                        "id": 96,
+                                        "name": "BinaryOperation",
+                                        "src": "1757:27:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 8,
+                                          "type": "uint256",
+                                          "value": "protocolFee"
+                                        },
+                                        "id": 97,
+                                        "name": "Identifier",
+                                        "src": "1787:11:0"
+                                      }
+                                    ],
+                                    "id": 98,
+                                    "name": "BinaryOperation",
+                                    "src": "1757:41:0"
                                   }
                                 ],
-                                "id": 83,
+                                "id": 99,
                                 "name": "FunctionCall",
-                                "src": "1596:34:0"
+                                "src": "1726:73:0"
                               }
                             ],
-                            "id": 84,
+                            "id": 100,
                             "name": "ExpressionStatement",
-                            "src": "1596:34:0"
+                            "src": "1726:73:0"
+                          },
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address",
+                                          "typeString": "address"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 101,
+                                    "name": "Identifier",
+                                    "src": "1807:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 72,
+                                      "type": "address",
+                                      "value": "_feeTo"
+                                    },
+                                    "id": 102,
+                                    "name": "Identifier",
+                                    "src": "1826:6:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 8,
+                                      "type": "uint256",
+                                      "value": "protocolFee"
+                                    },
+                                    "id": 103,
+                                    "name": "Identifier",
+                                    "src": "1834:11:0"
+                                  }
+                                ],
+                                "id": 104,
+                                "name": "FunctionCall",
+                                "src": "1807:39:0"
+                              }
+                            ],
+                            "id": 105,
+                            "name": "ExpressionStatement",
+                            "src": "1807:39:0"
                           }
                         ],
-                        "id": 85,
+                        "id": 106,
                         "name": "Block",
-                        "src": "1588:49:0"
+                        "src": "1718:135:0"
+                      },
+                      {
+                        "children": [
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 107,
+                                    "name": "Identifier",
+                                    "src": "1867:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 64,
+                                      "type": "address payable",
+                                      "value": "_recipient"
+                                    },
+                                    "id": 108,
+                                    "name": "Identifier",
+                                    "src": "1886:10:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
+                                    },
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 660,
+                                          "type": "uint256",
+                                          "value": "denomination"
+                                        },
+                                        "id": 109,
+                                        "name": "Identifier",
+                                        "src": "1898:12:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 68,
+                                          "type": "uint256",
+                                          "value": "_relayer_fee"
+                                        },
+                                        "id": 110,
+                                        "name": "Identifier",
+                                        "src": "1913:12:0"
+                                      }
+                                    ],
+                                    "id": 111,
+                                    "name": "BinaryOperation",
+                                    "src": "1898:27:0"
+                                  }
+                                ],
+                                "id": 112,
+                                "name": "FunctionCall",
+                                "src": "1867:59:0"
+                              }
+                            ],
+                            "id": 113,
+                            "name": "ExpressionStatement",
+                            "src": "1867:59:0"
+                          }
+                        ],
+                        "id": 114,
+                        "name": "Block",
+                        "src": "1859:74:0"
                       }
                     ],
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                   },
                   {
                     "attributes": {
@@ -5052,13 +6050,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 59,
+                              "referencedDeclaration": 68,
                               "type": "uint256",
-                              "value": "_refund"
+                              "value": "_relayer_fee"
                             },
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+                            "id": 116,
                             "name": "Identifier",
-                            "src": "1647:7:0"
+                            "src": "1943:12:0"
                           },
                           {
                             "attributes": {
@@ -5073,21 +6071,167 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 88,
+                            "id": 117,
                             "name": "Literal",
-                            "src": "1657:1:0"
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                           }
                         ],
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+                        "id": 118,
                         "name": "BinaryOperation",
-                        "src": "1647:11:0"
+                        "src": "1943:16:0"
+                      },
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+                          {
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+                                  "isPure": false,
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+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 119,
+                                    "name": "Identifier",
+                                    "src": "1969:18:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 66,
+                                      "type": "address payable",
+                                      "value": "_relayer"
+                                    },
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+                                    "name": "Identifier",
+                                    "src": "1988:8:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 68,
+                                      "type": "uint256",
+                                      "value": "_relayer_fee"
+                                    },
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+                                    "name": "Identifier",
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+                                  }
+                                ],
+                                "id": 122,
+                                "name": "FunctionCall",
+                                "src": "1969:42:0"
+                              }
+                            ],
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+                            "name": "ExpressionStatement",
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+                          "commonType": {
+                            "typeIdentifier": "t_uint256",
+                            "typeString": "uint256"
+                          },
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+                          "isLValue": false,
+                          "isPure": false,
+                          "lValueRequested": false,
+                          "operator": ">",
+                          "type": "bool"
+                        },
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+                              "overloadedDeclarations": [
+                                null
+                              ],
+                              "referencedDeclaration": 70,
+                              "type": "uint256",
+                              "value": "_refund"
+                            },
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+                            "name": "Identifier",
+                            "src": "2028:7:0"
+                          },
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+                              "hexvalue": "30",
+                              "isConstant": false,
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+                              "lValueRequested": false,
+                              "subdenomination": null,
+                              "token": "number",
+                              "type": "int_const 0",
+                              "value": "0"
+                            },
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+                            "name": "Literal",
+                            "src": "2038:1:0"
+                          }
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+                        "name": "BinaryOperation",
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                       {
                         "children": [
                           {
                             "attributes": {
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@@ -5096,7 +6240,7 @@
                                 "attributes": {
                                   "constant": false,
                                   "name": "success",
-                                  "scope": 110,
+                                  "scope": 149,
                                   "stateVariable": false,
                                   "storageLocation": "default",
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@@ -5109,14 +6253,14 @@
                                       "name": "bool",
                                       "type": "bool"
                                     },
-                                    "id": 90,
+                                    "id": 129,
                                     "name": "ElementaryTypeName",
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                                 "name": "VariableDeclaration",
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@@ -5188,23 +6332,23 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 53,
+                                                  "referencedDeclaration": 64,
                                                   "type": "address payable",
                                                   "value": "_recipient"
                                                 },
-                                                "id": 92,
+                                                "id": 131,
                                                 "name": "Identifier",
-                                                "src": "1687:10:0"
+                                                "src": "2068:10:0"
                                               }
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                                             "name": "MemberAccess",
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                                         "name": "MemberAccess",
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@@ -5212,18 +6356,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
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                                           "type": "uint256",
                                           "value": "_refund"
                                         },
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                                         "name": "Identifier",
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@@ -5238,19 +6382,19 @@
                                       "type": "literal_string \"\"",
                                       "value": ""
                                     },
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                                     "name": "Literal",
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+                                    "src": "2099:2:0"
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                                 "name": "FunctionCall",
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                             "name": "VariableDeclarationStatement",
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@@ -5275,18 +6419,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
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                                       "type": "bool",
                                       "value": "success"
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                                     "name": "Identifier",
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                                 "name": "UnaryOperation",
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@@ -5330,18 +6474,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
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+                                                  "referencedDeclaration": 66,
                                                   "type": "address payable",
                                                   "value": "_relayer"
                                                 },
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+                                                "id": 141,
                                                 "name": "Identifier",
-                                                "src": "1805:8:0"
+                                                "src": "2186:8:0"
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+                                            "id": 143,
                                             "name": "MemberAccess",
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@@ -5349,53 +6493,53 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 59,
+                                              "referencedDeclaration": 70,
                                               "type": "uint256",
                                               "value": "_refund"
                                             },
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                                             "name": "Identifier",
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+                                            "src": "2204:7:0"
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                                       }
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                                 "name": "Block",
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                             ],
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                             "name": "IfStatement",
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+                            "src": "2110:111:0"
                           }
                         ],
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                         "name": "Block",
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                 ],
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           {
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@@ -5407,7 +6551,7 @@
                 null
               ],
               "name": "_safeErc20TransferFrom",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
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               "visibility": "internal"
@@ -5419,7 +6563,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_from",
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5433,20 +6577,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 114,
+                        "id": 153,
                         "name": "ElementaryTypeName",
-                        "src": "1886:7:0"
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                     ],
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-                    "src": "1886:13:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_to",
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                       "type": "address",
@@ -5460,20 +6604,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 116,
+                        "id": 155,
                         "name": "ElementaryTypeName",
-                        "src": "1901:7:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 171,
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5486,19 +6630,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 118,
+                        "id": 157,
                         "name": "ElementaryTypeName",
-                        "src": "1914:7:0"
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@@ -5507,17 +6651,17 @@
                   ]
                 },
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                 "name": "ParameterList",
-                "src": "1940:0:0"
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               {
                 "children": [
                   {
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-                        123,
-                        125
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@@ -5525,7 +6669,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 170,
+                          "scope": 209,
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                           "storageLocation": "default",
                           "type": "bool",
@@ -5538,20 +6682,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 122,
+                            "id": 161,
                             "name": "ElementaryTypeName",
-                            "src": "1947:4:0"
+                            "src": "2328:4:0"
                           }
                         ],
-                        "id": 123,
+                        "id": 162,
                         "name": "VariableDeclaration",
-                        "src": "1947:12:0"
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                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 170,
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                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -5564,14 +6708,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 124,
+                            "id": 163,
                             "name": "ElementaryTypeName",
-                            "src": "1961:5:0"
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                         ],
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                         "name": "VariableDeclaration",
-                        "src": "1961:17:0"
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                         "attributes": {
@@ -5615,14 +6759,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 126,
+                                "id": 165,
                                 "name": "Identifier",
-                                "src": "1982:5:0"
+                                "src": "2363:5:0"
                               }
                             ],
-                            "id": 127,
+                            "id": 166,
                             "name": "MemberAccess",
-                            "src": "1982:10:0"
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                           {
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@@ -5674,18 +6818,18 @@
                                       "overloadedDeclarations": [
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-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
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                                       "value": "abi"
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+                                    "id": 167,
                                     "name": "Identifier",
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+                                "id": 168,
                                 "name": "MemberAccess",
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@@ -5700,9 +6844,9 @@
                                   "type": "int_const 599290589",
                                   "value": "0x23b872dd"
                                 },
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                                 "name": "Literal",
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@@ -5710,13 +6854,13 @@
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-                                  "referencedDeclaration": 115,
+                                  "referencedDeclaration": 154,
                                   "type": "address",
                                   "value": "_from"
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+                                "id": 170,
                                 "name": "Identifier",
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@@ -5724,13 +6868,13 @@
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                                 "name": "Identifier",
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                                 "attributes": {
@@ -5738,28 +6882,28 @@
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+                                  "referencedDeclaration": 158,
                                   "type": "uint256",
                                   "value": "_amount"
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                                 "name": "Identifier",
-                                "src": "2059:7:0"
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@@ -5791,16 +6935,16 @@
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                               "value": "require"
                             },
-                            "id": 137,
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                             "name": "Identifier",
-                            "src": "2074:7:0"
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@@ -5808,13 +6952,13 @@
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                             "name": "Identifier",
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@@ -5829,19 +6973,19 @@
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@@ -5881,18 +7025,18 @@
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                             "name": "MemberAccess",
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@@ -5907,14 +7051,14 @@
                               "type": "int_const 0",
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@@ -5948,16 +7092,16 @@
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+                                        1019
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+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 146,
+                                    "id": 185,
                                     "name": "Identifier",
-                                    "src": "2244:7:0"
+                                    "src": "2625:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -5992,18 +7136,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 125,
+                                              "referencedDeclaration": 164,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 147,
+                                            "id": 186,
                                             "name": "Identifier",
-                                            "src": "2252:4:0"
+                                            "src": "2633:4:0"
                                           }
                                         ],
-                                        "id": 148,
+                                        "id": 187,
                                         "name": "MemberAccess",
-                                        "src": "2252:11:0"
+                                        "src": "2633:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6018,14 +7162,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 149,
+                                        "id": 188,
                                         "name": "Literal",
-                                        "src": "2267:2:0"
+                                        "src": "2648:2:0"
                                       }
                                     ],
-                                    "id": 150,
+                                    "id": 189,
                                     "name": "BinaryOperation",
-                                    "src": "2252:17:0"
+                                    "src": "2633:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6040,19 +7184,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 151,
+                                    "id": 190,
                                     "name": "Literal",
-                                    "src": "2271:44:0"
+                                    "src": "2652:44:0"
                                   }
                                 ],
-                                "id": 152,
+                                "id": 191,
                                 "name": "FunctionCall",
-                                "src": "2244:72:0"
+                                "src": "2625:72:0"
                               }
                             ],
-                            "id": 153,
+                            "id": 192,
                             "name": "ExpressionStatement",
-                            "src": "2244:72:0"
+                            "src": "2625:72:0"
                           },
                           {
                             "children": [
@@ -6073,13 +7217,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 154,
+                                    "id": 193,
                                     "name": "Identifier",
-                                    "src": "2324:7:0"
+                                    "src": "2705:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6123,18 +7267,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 155,
+                                            "id": 194,
                                             "name": "Identifier",
-                                            "src": "2334:3:0"
+                                            "src": "2715:3:0"
                                           }
                                         ],
-                                        "id": 156,
+                                        "id": 195,
                                         "name": "MemberAccess",
-                                        "src": "2334:10:0"
+                                        "src": "2715:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6142,13 +7286,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 125,
+                                          "referencedDeclaration": 164,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 157,
+                                        "id": 196,
                                         "name": "Identifier",
-                                        "src": "2345:4:0"
+                                        "src": "2726:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -6171,29 +7315,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 158,
+                                            "id": 197,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2352:4:0"
+                                            "src": "2733:4:0"
                                           }
                                         ],
-                                        "id": 159,
+                                        "id": 198,
                                         "name": "TupleExpression",
-                                        "src": "2351:6:0"
+                                        "src": "2732:6:0"
                                       }
                                     ],
-                                    "id": 160,
+                                    "id": 199,
                                     "name": "FunctionCall",
-                                    "src": "2334:24:0"
+                                    "src": "2715:24:0"
                                   }
                                 ],
-                                "id": 161,
+                                "id": 200,
                                 "name": "Assignment",
-                                "src": "2324:34:0"
+                                "src": "2705:34:0"
                               }
                             ],
-                            "id": 162,
+                            "id": 201,
                             "name": "ExpressionStatement",
-                            "src": "2324:34:0"
+                            "src": "2705:34:0"
                           },
                           {
                             "children": [
@@ -6225,16 +7369,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 163,
+                                    "id": 202,
                                     "name": "Identifier",
-                                    "src": "2366:7:0"
+                                    "src": "2747:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6242,13 +7386,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 164,
+                                    "id": 203,
                                     "name": "Identifier",
-                                    "src": "2374:7:0"
+                                    "src": "2755:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6263,39 +7407,39 @@
                                       "type": "literal_string \"not enough allowed tokens. Token returns false.\"",
                                       "value": "not enough allowed tokens. Token returns false."
                                     },
-                                    "id": 165,
+                                    "id": 204,
                                     "name": "Literal",
-                                    "src": "2383:49:0"
+                                    "src": "2764:49:0"
                                   }
                                 ],
-                                "id": 166,
+                                "id": 205,
                                 "name": "FunctionCall",
-                                "src": "2366:67:0"
+                                "src": "2747:67:0"
                               }
                             ],
-                            "id": 167,
+                            "id": 206,
                             "name": "ExpressionStatement",
-                            "src": "2366:67:0"
+                            "src": "2747:67:0"
                           }
                         ],
-                        "id": 168,
+                        "id": 207,
                         "name": "Block",
-                        "src": "2236:204:0"
+                        "src": "2617:204:0"
                       }
                     ],
-                    "id": 169,
+                    "id": 208,
                     "name": "IfStatement",
-                    "src": "2215:225:0"
+                    "src": "2596:225:0"
                   }
                 ],
-                "id": 170,
+                "id": 209,
                 "name": "Block",
-                "src": "1940:504:0"
+                "src": "2321:504:0"
               }
             ],
-            "id": 171,
+            "id": 210,
             "name": "FunctionDefinition",
-            "src": "1854:590:0"
+            "src": "2235:590:0"
           },
           {
             "attributes": {
@@ -6307,7 +7451,7 @@
                 null
               ],
               "name": "_safeErc20Transfer",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6319,7 +7463,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_to",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -6333,20 +7477,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 172,
+                        "id": 211,
                         "name": "ElementaryTypeName",
-                        "src": "2476:7:0"
+                        "src": "2857:7:0"
                       }
                     ],
-                    "id": 173,
+                    "id": 212,
                     "name": "VariableDeclaration",
-                    "src": "2476:11:0"
+                    "src": "2857:11:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6359,19 +7503,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 174,
+                        "id": 213,
                         "name": "ElementaryTypeName",
-                        "src": "2489:7:0"
+                        "src": "2870:7:0"
                       }
                     ],
-                    "id": 175,
+                    "id": 214,
                     "name": "VariableDeclaration",
-                    "src": "2489:15:0"
+                    "src": "2870:15:0"
                   }
                 ],
-                "id": 176,
+                "id": 215,
                 "name": "ParameterList",
-                "src": "2475:30:0"
+                "src": "2856:30:0"
               },
               {
                 "attributes": {
@@ -6380,17 +7524,17 @@
                   ]
                 },
                 "children": [],
-                "id": 177,
+                "id": 216,
                 "name": "ParameterList",
-                "src": "2515:0:0"
+                "src": "2896:0:0"
               },
               {
                 "children": [
                   {
                     "attributes": {
                       "assignments": [
-                        179,
-                        181
+                        218,
+                        220
                       ]
                     },
                     "children": [
@@ -6398,7 +7542,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "bool",
@@ -6411,20 +7555,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 178,
+                            "id": 217,
                             "name": "ElementaryTypeName",
-                            "src": "2522:4:0"
+                            "src": "2903:4:0"
                           }
                         ],
-                        "id": 179,
+                        "id": 218,
                         "name": "VariableDeclaration",
-                        "src": "2522:12:0"
+                        "src": "2903:12:0"
                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -6437,14 +7581,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 180,
+                            "id": 219,
                             "name": "ElementaryTypeName",
-                            "src": "2536:5:0"
+                            "src": "2917:5:0"
                           }
                         ],
-                        "id": 181,
+                        "id": 220,
                         "name": "VariableDeclaration",
-                        "src": "2536:17:0"
+                        "src": "2917:17:0"
                       },
                       {
                         "attributes": {
@@ -6488,14 +7632,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 182,
+                                "id": 221,
                                 "name": "Identifier",
-                                "src": "2557:5:0"
+                                "src": "2938:5:0"
                               }
                             ],
-                            "id": 183,
+                            "id": 222,
                             "name": "MemberAccess",
-                            "src": "2557:10:0"
+                            "src": "2938:10:0"
                           },
                           {
                             "attributes": {
@@ -6543,18 +7687,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
                                       "type": "abi",
                                       "value": "abi"
                                     },
-                                    "id": 184,
+                                    "id": 223,
                                     "name": "Identifier",
-                                    "src": "2568:3:0"
+                                    "src": "2949:3:0"
                                   }
                                 ],
-                                "id": 185,
+                                "id": 224,
                                 "name": "MemberAccess",
-                                "src": "2568:22:0"
+                                "src": "2949:22:0"
                               },
                               {
                                 "attributes": {
@@ -6569,9 +7713,9 @@
                                   "type": "int_const 2835717307",
                                   "value": "0xa9059cbb"
                                 },
-                                "id": 186,
+                                "id": 225,
                                 "name": "Literal",
-                                "src": "2591:10:0"
+                                "src": "2972:10:0"
                               },
                               {
                                 "attributes": {
@@ -6579,13 +7723,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 173,
+                                  "referencedDeclaration": 212,
                                   "type": "address",
                                   "value": "_to"
                                 },
-                                "id": 187,
+                                "id": 226,
                                 "name": "Identifier",
-                                "src": "2618:3:0"
+                                "src": "2999:3:0"
                               },
                               {
                                 "attributes": {
@@ -6593,28 +7737,28 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 175,
+                                  "referencedDeclaration": 214,
                                   "type": "uint256",
                                   "value": "_amount"
                                 },
-                                "id": 188,
+                                "id": 227,
                                 "name": "Identifier",
-                                "src": "2623:7:0"
+                                "src": "3004:7:0"
                               }
                             ],
-                            "id": 189,
+                            "id": 228,
                             "name": "FunctionCall",
-                            "src": "2568:63:0"
+                            "src": "2949:63:0"
                           }
                         ],
-                        "id": 190,
+                        "id": 229,
                         "name": "FunctionCall",
-                        "src": "2557:75:0"
+                        "src": "2938:75:0"
                       }
                     ],
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                     "name": "VariableDeclarationStatement",
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+                    "src": "2902:111:0"
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                   {
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@@ -6646,16 +7790,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
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-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 192,
+                            "id": 231,
                             "name": "Identifier",
-                            "src": "2638:7:0"
+                            "src": "3019:7:0"
                           },
                           {
                             "attributes": {
@@ -6663,13 +7807,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 179,
+                              "referencedDeclaration": 218,
                               "type": "bool",
                               "value": "success"
                             },
-                            "id": 193,
+                            "id": 232,
                             "name": "Identifier",
-                            "src": "2646:7:0"
+                            "src": "3027:7:0"
                           },
                           {
                             "attributes": {
@@ -6684,19 +7828,19 @@
                               "type": "literal_string \"not enough tokens\"",
                               "value": "not enough tokens"
                             },
-                            "id": 194,
+                            "id": 233,
                             "name": "Literal",
-                            "src": "2655:19:0"
+                            "src": "3036:19:0"
                           }
                         ],
-                        "id": 195,
+                        "id": 234,
                         "name": "FunctionCall",
-                        "src": "2638:37:0"
+                        "src": "3019:37:0"
                       }
                     ],
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+                    "id": 235,
                     "name": "ExpressionStatement",
-                    "src": "2638:37:0"
+                    "src": "3019:37:0"
                   },
                   {
                     "attributes": {
@@ -6736,18 +7880,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 181,
+                                  "referencedDeclaration": 220,
                                   "type": "bytes memory",
                                   "value": "data"
                                 },
-                                "id": 197,
+                                "id": 236,
                                 "name": "Identifier",
-                                "src": "2775:4:0"
+                                "src": "3156:4:0"
                               }
                             ],
-                            "id": 198,
+                            "id": 237,
                             "name": "MemberAccess",
-                            "src": "2775:11:0"
+                            "src": "3156:11:0"
                           },
                           {
                             "attributes": {
@@ -6762,14 +7906,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 199,
+                            "id": 238,
                             "name": "Literal",
-                            "src": "2789:1:0"
+                            "src": "3170:1:0"
                           }
                         ],
-                        "id": 200,
+                        "id": 239,
                         "name": "BinaryOperation",
-                        "src": "2775:15:0"
+                        "src": "3156:15:0"
                       },
                       {
                         "children": [
@@ -6803,16 +7947,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 201,
+                                    "id": 240,
                                     "name": "Identifier",
-                                    "src": "2800:7:0"
+                                    "src": "3181:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6847,18 +7991,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 181,
+                                              "referencedDeclaration": 220,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 202,
+                                            "id": 241,
                                             "name": "Identifier",
-                                            "src": "2808:4:0"
+                                            "src": "3189:4:0"
                                           }
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-                                        "id": 203,
+                                        "id": 242,
                                         "name": "MemberAccess",
-                                        "src": "2808:11:0"
+                                        "src": "3189:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6873,14 +8017,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 204,
+                                        "id": 243,
                                         "name": "Literal",
-                                        "src": "2823:2:0"
+                                        "src": "3204:2:0"
                                       }
                                     ],
-                                    "id": 205,
+                                    "id": 244,
                                     "name": "BinaryOperation",
-                                    "src": "2808:17:0"
+                                    "src": "3189:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6895,19 +8039,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 206,
+                                    "id": 245,
                                     "name": "Literal",
-                                    "src": "2827:44:0"
+                                    "src": "3208:44:0"
                                   }
                                 ],
-                                "id": 207,
+                                "id": 246,
                                 "name": "FunctionCall",
-                                "src": "2800:72:0"
+                                "src": "3181:72:0"
                               }
                             ],
-                            "id": 208,
+                            "id": 247,
                             "name": "ExpressionStatement",
-                            "src": "2800:72:0"
+                            "src": "3181:72:0"
                           },
                           {
                             "children": [
@@ -6928,13 +8072,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 209,
+                                    "id": 248,
                                     "name": "Identifier",
-                                    "src": "2880:7:0"
+                                    "src": "3261:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6978,18 +8122,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 210,
+                                            "id": 249,
                                             "name": "Identifier",
-                                            "src": "2890:3:0"
+                                            "src": "3271:3:0"
                                           }
                                         ],
-                                        "id": 211,
+                                        "id": 250,
                                         "name": "MemberAccess",
-                                        "src": "2890:10:0"
+                                        "src": "3271:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6997,13 +8141,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 181,
+                                          "referencedDeclaration": 220,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 212,
+                                        "id": 251,
                                         "name": "Identifier",
-                                        "src": "2901:4:0"
+                                        "src": "3282:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -7026,29 +8170,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 213,
+                                            "id": 252,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2908:4:0"
+                                            "src": "3289:4:0"
                                           }
                                         ],
-                                        "id": 214,
+                                        "id": 253,
                                         "name": "TupleExpression",
-                                        "src": "2907:6:0"
+                                        "src": "3288:6:0"
                                       }
                                     ],
-                                    "id": 215,
+                                    "id": 254,
                                     "name": "FunctionCall",
-                                    "src": "2890:24:0"
+                                    "src": "3271:24:0"
                                   }
                                 ],
-                                "id": 216,
+                                "id": 255,
                                 "name": "Assignment",
-                                "src": "2880:34:0"
+                                "src": "3261:34:0"
                               }
                             ],
-                            "id": 217,
+                            "id": 256,
                             "name": "ExpressionStatement",
-                            "src": "2880:34:0"
+                            "src": "3261:34:0"
                           },
                           {
                             "children": [
@@ -7080,16 +8224,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 218,
+                                    "id": 257,
                                     "name": "Identifier",
-                                    "src": "2922:7:0"
+                                    "src": "3303:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7097,13 +8241,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 219,
+                                    "id": 258,
                                     "name": "Identifier",
-                                    "src": "2930:7:0"
+                                    "src": "3311:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7118,49 +8262,49 @@
                                       "type": "literal_string \"not enough tokens. Token returns false.\"",
                                       "value": "not enough tokens. Token returns false."
                                     },
-                                    "id": 220,
+                                    "id": 259,
                                     "name": "Literal",
-                                    "src": "2939:41:0"
+                                    "src": "3320:41:0"
                                   }
                                 ],
-                                "id": 221,
+                                "id": 260,
                                 "name": "FunctionCall",
-                                "src": "2922:59:0"
+                                "src": "3303:59:0"
                               }
                             ],
-                            "id": 222,
+                            "id": 261,
                             "name": "ExpressionStatement",
-                            "src": "2922:59:0"
+                            "src": "3303:59:0"
                           }
                         ],
-                        "id": 223,
+                        "id": 262,
                         "name": "Block",
-                        "src": "2792:196:0"
+                        "src": "3173:196:0"
                       }
                     ],
-                    "id": 224,
+                    "id": 263,
                     "name": "IfStatement",
-                    "src": "2771:217:0"
+                    "src": "3152:217:0"
                   }
                 ],
-                "id": 225,
+                "id": 264,
                 "name": "Block",
-                "src": "2515:477:0"
+                "src": "2896:477:0"
               }
             ],
-            "id": 226,
+            "id": 265,
             "name": "FunctionDefinition",
-            "src": "2448:544:0"
+            "src": "2829:544:0"
           }
         ],
-        "id": 227,
+        "id": 266,
         "name": "ContractDefinition",
-        "src": "805:2189:0"
+        "src": "805:2570:0"
       }
     ],
-    "id": 228,
+    "id": 267,
     "name": "SourceUnit",
-    "src": "755:2240:0"
+    "src": "755:2621:0"
   },
   "compiler": {
     "name": "solc",
@@ -7170,14 +8314,14 @@
     "42220": {
       "events": {},
       "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
+        "Hasher": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE"
       },
-      "address": "0xCc5951C9bF5e65a5114Ae759E5B55ad3AB095176",
-      "transactionHash": "0x482724f33b331886dfb44bc5c6d45b1983e948e486da711d547b7cc2b8899a82"
+      "address": "0xD39697c01279DfaCad50b27D03EDAEc6Bca03097",
+      "transactionHash": "0x10232b5c9b26f0f8fee8927b01d45c90bf79b16bc2a8ff59ce20144ea5895556"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:53:25.861Z",
+  "updatedAt": "2021-04-02T22:55:05.713Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {
diff --git a/client/contracts/CELOTornado.1.json b/client/contracts/CELOTornado.1.json
index 0498602..7f02a75 100644
--- a/client/contracts/CELOTornado.1.json
+++ b/client/contracts/CELOTornado.1.json
@@ -8,6 +8,11 @@
           "name": "_verifier",
           "type": "address"
         },
+        {
+          "internalType": "contract IFeeManager",
+          "name": "_feeManager",
+          "type": "address"
+        },
         {
           "internalType": "uint256",
           "name": "_denomination",
@@ -215,6 +220,21 @@
       "stateMutability": "payable",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "feeManager",
+      "outputs": [
+        {
+          "internalType": "contract IFeeManager",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -406,6 +426,21 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "protocolFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -539,21 +574,21 @@
       "type": "function"
     }
   ],
-  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x708938fd083239d2e9cd17e457cf25a2150bb900082fad58af8b689f786aef9c\",\"urls\":[\"bzz-raw://f345afd62002f883c60c032cd0cb051663dc8a3e59a52bf44109633b96cb3685\",\"dweb:/ipfs/QmNwjnH2uyNoq9GPjNUv6Z1mgtiR5rY3K7EHY74RBjXMpw\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0x09c70432243629ef44697fd3d0ca89d3578e2b1c9f46d90757371edb163c14da\",\"urls\":[\"bzz-raw://d2a2c9fa85c32cb15793282792cd25c71804a10aa5a911e41f3bcd07f5df117e\",\"dweb:/ipfs/QmeQ1s6ypNnP7fossR4x9svuuLjcSBtQ5spUTmWGZY5Ljr\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
+  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"contract IFeeManager\",\"name\":\"_feeManager\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"feeManager\",\"outputs\":[{\"internalType\":\"contract IFeeManager\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"protocolFee\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x5c57c88351063f1864166162f6f32be5aebae197a18abaef8d08d67b36440a51\",\"urls\":[\"bzz-raw://6da2d6faa828b1cad43428366d273e4aa61fc176d6541fb641028985497caa0f\",\"dweb:/ipfs/QmULz388t88hr999vUk5PidTTJwbEWGUyb3d6QGnDA6qoV\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0xe7db8acb3efcecf95c7364f447ed1764c571dbf5090fd4641fe4668a965332eb\",\"urls\":[\"bzz-raw://45e790c247c38ed8ae473e3165c1148ea10a753cf6e9f9c8742394019be2aef6\",\"dweb:/ipfs/QmaGfk1ndvqur2NvCY3TWoKuorfBVShXeykKei18GDY582\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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+  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n  uint256 public protocolFee;\n\n  constructor(\n    IVerifier _verifier,\n    IFeeManager _feeManager,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _feeManager, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n    // 0.5% fee\n    protocolFee = _denomination / 200;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _relayer_fee, uint256 _refund, address _feeTo) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    bool feeOn = _feeTo != address(0);\n    if (feeOn) {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee - protocolFee);\n      _safeErc20Transfer(_feeTo, protocolFee);\n    } else {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee);\n    }\n\n    if (_relayer_fee > 0) {\n      _safeErc20Transfer(_relayer, _relayer_fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
   "sourcePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
   "ast": {
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
     "exportedSymbols": {
       "ERC20Tornado": [
-        227
+        266
       ]
     },
-    "id": 228,
+    "id": 267,
     "nodeType": "SourceUnit",
     "nodes": [
       {
@@ -571,8 +606,8 @@
         "file": "./Tornado.sol",
         "id": 2,
         "nodeType": "ImportDirective",
-        "scope": 228,
-        "sourceUnit": 1195,
+        "scope": 267,
+        "sourceUnit": 971,
         "src": "780:23:0",
         "symbolAliases": [],
         "unitAlias": ""
@@ -586,10 +621,10 @@
               "id": 3,
               "name": "Tornado",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1194,
+              "referencedDeclaration": 970,
               "src": "830:7:0",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_Tornado_$1194",
+                "typeIdentifier": "t_contract$_Tornado_$970",
                 "typeString": "contract Tornado"
               }
             },
@@ -599,19 +634,19 @@
           }
         ],
         "contractDependencies": [
-          694,
-          1194,
-          3245
+          632,
+          970,
+          1000
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": true,
-        "id": 227,
+        "id": 266,
         "linearizedBaseContracts": [
-          227,
-          1194,
-          3245,
-          694
+          266,
+          970,
+          1000,
+          632
         ],
         "name": "ERC20Tornado",
         "nodeType": "ContractDefinition",
@@ -621,7 +656,7 @@
             "id": 6,
             "name": "token",
             "nodeType": "VariableDeclaration",
-            "scope": 227,
+            "scope": 266,
             "src": "842:20:0",
             "stateVariable": true,
             "storageLocation": "default",
@@ -643,28 +678,54 @@
             "value": null,
             "visibility": "public"
           },
+          {
+            "constant": false,
+            "id": 8,
+            "name": "protocolFee",
+            "nodeType": "VariableDeclaration",
+            "scope": 266,
+            "src": "866:26:0",
+            "stateVariable": true,
+            "storageLocation": "default",
+            "typeDescriptions": {
+              "typeIdentifier": "t_uint256",
+              "typeString": "uint256"
+            },
+            "typeName": {
+              "id": 7,
+              "name": "uint256",
+              "nodeType": "ElementaryTypeName",
+              "src": "866:7:0",
+              "typeDescriptions": {
+                "typeIdentifier": "t_uint256",
+                "typeString": "uint256"
+              }
+            },
+            "value": null,
+            "visibility": "public"
+          },
           {
             "body": {
-              "id": 29,
+              "id": 40,
               "nodeType": "Block",
-              "src": "1079:25:0",
+              "src": "1151:80:0",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 27,
+                    "id": 32,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 25,
+                      "id": 30,
                       "name": "token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
                       "referencedDeclaration": 6,
-                      "src": "1085:5:0",
+                      "src": "1157:5:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -674,31 +735,114 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 26,
+                      "id": 31,
                       "name": "_token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 16,
-                      "src": "1093:6:0",
+                      "referencedDeclaration": 20,
+                      "src": "1165:6:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1085:14:0",
+                    "src": "1157:14:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
-                  "id": 28,
+                  "id": 33,
                   "nodeType": "ExpressionStatement",
-                  "src": "1085:14:0"
+                  "src": "1157:14:0"
+                },
+                {
+                  "expression": {
+                    "argumentTypes": null,
+                    "id": 38,
+                    "isConstant": false,
+                    "isLValue": false,
+                    "isPure": false,
+                    "lValueRequested": false,
+                    "leftHandSide": {
+                      "argumentTypes": null,
+                      "id": 34,
+                      "name": "protocolFee",
+                      "nodeType": "Identifier",
+                      "overloadedDeclarations": [],
+                      "referencedDeclaration": 8,
+                      "src": "1193:11:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "nodeType": "Assignment",
+                    "operator": "=",
+                    "rightHandSide": {
+                      "argumentTypes": null,
+                      "commonType": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      },
+                      "id": 37,
+                      "isConstant": false,
+                      "isLValue": false,
+                      "isPure": false,
+                      "lValueRequested": false,
+                      "leftExpression": {
+                        "argumentTypes": null,
+                        "id": 35,
+                        "name": "_denomination",
+                        "nodeType": "Identifier",
+                        "overloadedDeclarations": [],
+                        "referencedDeclaration": 14,
+                        "src": "1207:13:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_uint256",
+                          "typeString": "uint256"
+                        }
+                      },
+                      "nodeType": "BinaryOperation",
+                      "operator": "/",
+                      "rightExpression": {
+                        "argumentTypes": null,
+                        "hexValue": "323030",
+                        "id": 36,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "kind": "number",
+                        "lValueRequested": false,
+                        "nodeType": "Literal",
+                        "src": "1223:3:0",
+                        "subdenomination": null,
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_rational_200_by_1",
+                          "typeString": "int_const 200"
+                        },
+                        "value": "200"
+                      },
+                      "src": "1207:19:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "src": "1193:33:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "id": 39,
+                  "nodeType": "ExpressionStatement",
+                  "src": "1193:33:0"
                 }
               ]
             },
             "documentation": null,
-            "id": 30,
+            "id": 41,
             "implemented": true,
             "kind": "constructor",
             "modifiers": [
@@ -706,25 +850,38 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 19,
+                    "id": 23,
                     "name": "_verifier",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 8,
-                    "src": "1016:9:0",
+                    "referencedDeclaration": 10,
+                    "src": "1075:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   {
                     "argumentTypes": null,
-                    "id": 20,
+                    "id": 24,
+                    "name": "_feeManager",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 12,
+                    "src": "1086:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  {
+                    "argumentTypes": null,
+                    "id": 25,
                     "name": "_denomination",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 10,
-                    "src": "1027:13:0",
+                    "referencedDeclaration": 14,
+                    "src": "1099:13:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -732,12 +889,12 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 21,
+                    "id": 26,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 12,
-                    "src": "1042:17:0",
+                    "referencedDeclaration": 16,
+                    "src": "1114:17:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -745,103 +902,131 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 22,
+                    "id": 27,
                     "name": "_operator",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 14,
-                    "src": "1061:9:0",
+                    "referencedDeclaration": 18,
+                    "src": "1133:9:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   }
                 ],
-                "id": 23,
+                "id": 28,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 18,
+                  "id": 22,
                   "name": "Tornado",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 1194,
-                  "src": "1008:7:0",
+                  "referencedDeclaration": 970,
+                  "src": "1067:7:0",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_Tornado_$1194_$",
+                    "typeIdentifier": "t_type$_t_contract$_Tornado_$970_$",
                     "typeString": "type(contract Tornado)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1008:63:0"
+                "src": "1067:76:0"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 17,
+              "id": 21,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 8,
+                  "id": 10,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "884:19:0",
+                  "scope": 41,
+                  "src": "914:19:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$891",
+                    "typeIdentifier": "t_contract$_IVerifier_$648",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 7,
+                    "id": 9,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 891,
-                    "src": "884:9:0",
+                    "referencedDeclaration": 648,
+                    "src": "914:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$648",
                       "typeString": "contract IVerifier"
                     }
                   },
                   "value": null,
                   "visibility": "internal"
                 },
-                {
-                  "constant": false,
-                  "id": 10,
-                  "name": "_denomination",
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-                  "src": "909:21:0",
-                  "stateVariable": false,
-                  "storageLocation": "default",
-                  "typeDescriptions": {
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-                    "typeString": "uint256"
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-                    "name": "uint256",
-                    "nodeType": "ElementaryTypeName",
-                    "src": "909:7:0",
-                    "typeDescriptions": {
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-                      "typeString": "uint256"
-                    }
-                  },
-                  "value": null,
-                  "visibility": "internal"
-                },
                 {
                   "constant": false,
                   "id": 12,
+                  "name": "_feeManager",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "939:23:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeString": "contract IFeeManager"
+                  },
+                  "typeName": {
+                    "contractScope": null,
+                    "id": 11,
+                    "name": "IFeeManager",
+                    "nodeType": "UserDefinedTypeName",
+                    "referencedDeclaration": 654,
+                    "src": "939:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
+                {
+                  "constant": false,
+                  "id": 14,
+                  "name": "_denomination",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "968:21:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_uint256",
+                    "typeString": "uint256"
+                  },
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+                    "name": "uint256",
+                    "nodeType": "ElementaryTypeName",
+                    "src": "968:7:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
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+                  "id": 16,
                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "936:24:0",
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+                  "src": "995:24:0",
                   "stateVariable": false,
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@@ -849,10 +1034,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 11,
+                    "id": 15,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "936:6:0",
+                    "src": "995:6:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -863,11 +1048,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 14,
+                  "id": 18,
                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "966:17:0",
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+                  "src": "1025:17:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -875,10 +1060,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 13,
+                    "id": 17,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "966:7:0",
+                    "src": "1025:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -890,11 +1075,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 16,
+                  "id": 20,
                   "name": "_token",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "989:14:0",
+                  "scope": 41,
+                  "src": "1048:14:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -902,10 +1087,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 15,
+                    "id": 19,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "989:7:0",
+                    "src": "1048:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -916,25 +1101,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "878:129:0"
+              "src": "908:158:0"
             },
             "returnParameters": {
-              "id": 24,
+              "id": 29,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1079:0:0"
+              "src": "1151:0:0"
             },
-            "scope": 227,
-            "src": "867:237:0",
+            "scope": 266,
+            "src": "897:334:0",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 50,
+              "id": 61,
               "nodeType": "Block",
-              "src": "1144:155:0",
+              "src": "1271:155:0",
               "statements": [
                 {
                   "expression": {
@@ -946,7 +1131,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 37,
+                        "id": 48,
                         "isConstant": false,
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@@ -955,18 +1140,18 @@
                           "argumentTypes": null,
                           "expression": {
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-                            "id": 34,
+                            "id": 45,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1158:3:0",
+                            "referencedDeclaration": 1015,
+                            "src": "1285:3:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 35,
+                          "id": 46,
                           "isConstant": false,
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@@ -974,7 +1159,7 @@
                           "memberName": "value",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "1158:9:0",
+                          "src": "1285:9:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -985,14 +1170,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 36,
+                          "id": 47,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1171:1:0",
+                          "src": "1298:1:0",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -1000,7 +1185,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1158:14:0",
+                        "src": "1285:14:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1009,14 +1194,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4554482076616c756520697320737570706f73656420746f206265203020666f7220455243323020696e7374616e6365",
-                        "id": 38,
+                        "id": 49,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1174:50:0",
+                        "src": "1301:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_b14b0818f1fdc710b92ba7e1ce725992b43e47a5b220b1b890f352eeac2e1d5e",
@@ -1036,21 +1221,21 @@
                           "typeString": "literal_string \"ETH value is supposed to be 0 for ERC20 instance\""
                         }
                       ],
-                      "id": 33,
+                      "id": 44,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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-                        3264
+                        1018,
+                        1019
                       ],
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-                      "src": "1150:7:0",
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+                      "src": "1277:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 39,
+                    "id": 50,
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@@ -1058,15 +1243,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1150:75:0",
+                    "src": "1277:75:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 40,
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                   "nodeType": "ExpressionStatement",
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                   "expression": {
@@ -1076,18 +1261,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 42,
+                          "id": 53,
                           "name": "msg",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 3260,
-                          "src": "1254:3:0",
+                          "referencedDeclaration": 1015,
+                          "src": "1381:3:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_message",
                             "typeString": "msg"
                           }
                         },
-                        "id": 43,
+                        "id": 54,
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@@ -1095,7 +1280,7 @@
                         "memberName": "sender",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "1254:10:0",
+                        "src": "1381:10:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -1106,14 +1291,14 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 45,
+                            "id": 56,
                             "name": "this",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3284,
-                            "src": "1274:4:0",
+                            "referencedDeclaration": 1041,
+                            "src": "1401:4:0",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           }
@@ -1121,24 +1306,24 @@
                         "expression": {
                           "argumentTypes": [
                             {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           ],
-                          "id": 44,
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                           "isConstant": false,
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                           "isPure": true,
                           "lValueRequested": false,
                           "nodeType": "ElementaryTypeNameExpression",
-                          "src": "1266:7:0",
+                          "src": "1393:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_type$_t_address_$",
                             "typeString": "type(address)"
                           },
                           "typeName": "address"
                         },
-                        "id": 46,
+                        "id": 57,
                         "isConstant": false,
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@@ -1146,7 +1331,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "1266:13:0",
+                        "src": "1393:13:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -1154,12 +1339,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 47,
+                        "id": 58,
                         "name": "denomination",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 897,
-                        "src": "1281:12:0",
+                        "referencedDeclaration": 660,
+                        "src": "1408:12:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1181,18 +1366,18 @@
                           "typeString": "uint256"
                         }
                       ],
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+                      "id": 52,
                       "name": "_safeErc20TransferFrom",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 171,
-                      "src": "1231:22:0",
+                      "referencedDeclaration": 210,
+                      "src": "1358:22:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,address,uint256)"
                       }
                     },
-                    "id": 48,
+                    "id": 59,
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@@ -1200,48 +1385,48 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1231:63:0",
+                    "src": "1358:63:0",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
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+                  "src": "1358:63:0"
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             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
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+              "id": 42,
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-              "src": "1132:2:0"
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+            "src": "1235:191:0",
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@@ -1253,7 +1438,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
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@@ -1262,18 +1447,18 @@
                           "argumentTypes": null,
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-                            "id": 63,
+                            "id": 76,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1437:3:0",
+                            "referencedDeclaration": 1015,
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                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
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@@ -1281,7 +1466,7 @@
                           "memberName": "value",
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                           "referencedDeclaration": null,
-                          "src": "1437:9:0",
+                          "src": "1588:9:0",
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                             "typeString": "uint256"
@@ -1291,18 +1476,18 @@
                         "operator": "==",
                         "rightExpression": {
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-                          "id": 65,
+                          "id": 78,
                           "name": "_refund",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 59,
-                          "src": "1450:7:0",
+                          "referencedDeclaration": 70,
+                          "src": "1601:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "1437:20:0",
+                        "src": "1588:20:0",
                         "typeDescriptions": {
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                           "typeString": "bool"
@@ -1311,14 +1496,14 @@
                       {
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                         "hexValue": "496e636f727265637420726566756e6420616d6f756e742072656365697665642062792074686520636f6e7472616374",
-                        "id": 67,
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1459:50:0",
+                        "src": "1610:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_3189ced290ffd29dc422911cd3b29574f21c524c91f4b41e6abb0646c581cbff",
@@ -1338,21 +1523,21 @@
                           "typeString": "literal_string \"Incorrect refund amount received by the contract\""
                         }
                       ],
-                      "id": 62,
+                      "id": 75,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1018,
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+                      "src": "1580:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
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                     },
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@@ -1360,178 +1545,158 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1429:81:0",
+                    "src": "1580:81:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 69,
+                  "id": 82,
                   "nodeType": "ExpressionStatement",
-                  "src": "1429:81:0"
+                  "src": "1580:81:0"
                 },
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-                    "arguments": [
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-                        "argumentTypes": null,
-                        "id": 71,
-                        "name": "_recipient",
-                        "nodeType": "Identifier",
-                        "overloadedDeclarations": [],
-                        "referencedDeclaration": 53,
-                        "src": "1536:10:0",
+                  "assignments": [
+                    84
+                  ],
+                  "declarations": [
+                    {
+                      "constant": false,
+                      "id": 84,
+                      "name": "feeOn",
+                      "nodeType": "VariableDeclaration",
+                      "scope": 151,
+                      "src": "1668:10:0",
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_bool",
+                        "typeString": "bool"
+                      },
+                      "typeName": {
+                        "id": 83,
+                        "name": "bool",
+                        "nodeType": "ElementaryTypeName",
+                        "src": "1668:4:0",
                         "typeDescriptions": {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
+                          "typeIdentifier": "t_bool",
+                          "typeString": "bool"
                         }
                       },
-                      {
-                        "argumentTypes": null,
-                        "commonType": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        },
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-                        "isPure": false,
-                        "lValueRequested": false,
-                        "leftExpression": {
-                          "argumentTypes": null,
-                          "id": 72,
-                          "name": "denomination",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 897,
-                          "src": "1548:12:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "nodeType": "BinaryOperation",
-                        "operator": "-",
-                        "rightExpression": {
-                          "argumentTypes": null,
-                          "id": 73,
-                          "name": "_fee",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 57,
-                          "src": "1563:4:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "src": "1548:19:0",
-                        "typeDescriptions": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      }
-                    ],
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-                      "argumentTypes": [
-                        {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
-                        },
-                        {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      ],
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-                      "src": "1517:18:0",
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-                        "typeString": "function (address,uint256)"
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-                    "src": "1517:51:0",
-                    "typeDescriptions": {
-                      "typeIdentifier": "t_tuple$__$",
-                      "typeString": "tuple()"
+                      "value": null,
+                      "visibility": "internal"
                     }
-                  },
-                  "id": 76,
-                  "nodeType": "ExpressionStatement",
-                  "src": "1517:51:0"
-                },
-                {
-                  "condition": {
+                  ],
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+                  "initialValue": {
                     "argumentTypes": null,
                     "commonType": {
-                      "typeIdentifier": "t_uint256",
-                      "typeString": "uint256"
+                      "typeIdentifier": "t_address",
+                      "typeString": "address"
                     },
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+                    "id": 89,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 77,
-                      "name": "_fee",
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+                      "name": "_feeTo",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 57,
-                      "src": "1578:4:0",
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+                      "src": "1681:6:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_uint256",
-                        "typeString": "uint256"
+                        "typeIdentifier": "t_address",
+                        "typeString": "address"
                       }
                     },
                     "nodeType": "BinaryOperation",
-                    "operator": ">",
+                    "operator": "!=",
                     "rightExpression": {
                       "argumentTypes": null,
-                      "hexValue": "30",
-                      "id": 78,
+                      "arguments": [
+                        {
+                          "argumentTypes": null,
+                          "hexValue": "30",
+                          "id": 87,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": true,
+                          "kind": "number",
+                          "lValueRequested": false,
+                          "nodeType": "Literal",
+                          "src": "1699:1:0",
+                          "subdenomination": null,
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          },
+                          "value": "0"
+                        }
+                      ],
+                      "expression": {
+                        "argumentTypes": [
+                          {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          }
+                        ],
+                        "id": 86,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "lValueRequested": false,
+                        "nodeType": "ElementaryTypeNameExpression",
+                        "src": "1691:7:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_type$_t_address_$",
+                          "typeString": "type(address)"
+                        },
+                        "typeName": "address"
+                      },
+                      "id": 88,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
-                      "kind": "number",
+                      "kind": "typeConversion",
                       "lValueRequested": false,
-                      "nodeType": "Literal",
-                      "src": "1585:1:0",
-                      "subdenomination": null,
+                      "names": [],
+                      "nodeType": "FunctionCall",
+                      "src": "1691:10:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_rational_0_by_1",
-                        "typeString": "int_const 0"
-                      },
-                      "value": "0"
+                        "typeIdentifier": "t_address_payable",
+                        "typeString": "address payable"
+                      }
                     },
-                    "src": "1578:8:0",
+                    "src": "1681:20:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
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-                  "id": 86,
-                  "nodeType": "IfStatement",
-                  "src": "1574:63:0",
-                  "trueBody": {
-                    "id": 85,
+                  "nodeType": "VariableDeclarationStatement",
+                  "src": "1668:33:0"
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "id": 91,
+                    "name": "feeOn",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 84,
+                    "src": "1711:5:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_bool",
+                      "typeString": "bool"
+                    }
+                  },
+                  "falseBody": {
+                    "id": 114,
                     "nodeType": "Block",
-                    "src": "1588:49:0",
+                    "src": "1859:74:0",
                     "statements": [
                       {
                         "expression": {
@@ -1539,12 +1704,12 @@
                           "arguments": [
                             {
                               "argumentTypes": null,
-                              "id": 81,
-                              "name": "_relayer",
+                              "id": 108,
+                              "name": "_recipient",
                               "nodeType": "Identifier",
                               "overloadedDeclarations": [],
-                              "referencedDeclaration": 55,
-                              "src": "1615:8:0",
+                              "referencedDeclaration": 64,
+                              "src": "1886:10:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_address_payable",
                                 "typeString": "address payable"
@@ -1552,12 +1717,44 @@
                             },
                             {
                               "argumentTypes": null,
-                              "id": 82,
-                              "name": "_fee",
-                              "nodeType": "Identifier",
-                              "overloadedDeclarations": [],
-                              "referencedDeclaration": 57,
-                              "src": "1625:4:0",
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 111,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "id": 109,
+                                "name": "denomination",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 660,
+                                "src": "1898:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 110,
+                                "name": "_relayer_fee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 68,
+                                "src": "1913:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1898:27:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_uint256",
                                 "typeString": "uint256"
@@ -1575,18 +1772,18 @@
                                 "typeString": "uint256"
                               }
                             ],
-                            "id": 80,
+                            "id": 107,
                             "name": "_safeErc20Transfer",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 226,
-                            "src": "1596:18:0",
+                            "referencedDeclaration": 265,
+                            "src": "1867:18:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
                               "typeString": "function (address,uint256)"
                             }
                           },
-                          "id": 83,
+                          "id": 112,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -1594,15 +1791,231 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "1596:34:0",
+                          "src": "1867:59:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_tuple$__$",
                             "typeString": "tuple()"
                           }
                         },
-                        "id": 84,
+                        "id": 113,
                         "nodeType": "ExpressionStatement",
-                        "src": "1596:34:0"
+                        "src": "1867:59:0"
+                      }
+                    ]
+                  },
+                  "id": 115,
+                  "nodeType": "IfStatement",
+                  "src": "1707:226:0",
+                  "trueBody": {
+                    "id": 106,
+                    "nodeType": "Block",
+                    "src": "1718:135:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 93,
+                              "name": "_recipient",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 64,
+                              "src": "1745:10:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 98,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "commonType": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                },
+                                "id": 96,
+                                "isConstant": false,
+                                "isLValue": false,
+                                "isPure": false,
+                                "lValueRequested": false,
+                                "leftExpression": {
+                                  "argumentTypes": null,
+                                  "id": 94,
+                                  "name": "denomination",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 660,
+                                  "src": "1757:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "nodeType": "BinaryOperation",
+                                "operator": "-",
+                                "rightExpression": {
+                                  "argumentTypes": null,
+                                  "id": 95,
+                                  "name": "_relayer_fee",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 68,
+                                  "src": "1772:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "src": "1757:27:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 97,
+                                "name": "protocolFee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 8,
+                                "src": "1787:11:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1757:41:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 92,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1726:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 99,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1726:73:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 100,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1726:73:0"
+                      },
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 102,
+                              "name": "_feeTo",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 72,
+                              "src": "1826:6:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 103,
+                              "name": "protocolFee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 8,
+                              "src": "1834:11:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 101,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1807:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 104,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1807:39:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 105,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1807:39:0"
                       }
                     ]
                   }
@@ -1614,19 +2027,19 @@
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     },
-                    "id": 89,
+                    "id": 118,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 87,
-                      "name": "_refund",
+                      "id": 116,
+                      "name": "_relayer_fee",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 59,
-                      "src": "1647:7:0",
+                      "referencedDeclaration": 68,
+                      "src": "1943:12:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1637,14 +2050,14 @@
                     "rightExpression": {
                       "argumentTypes": null,
                       "hexValue": "30",
-                      "id": 88,
+                      "id": 117,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "1657:1:0",
+                      "src": "1958:1:0",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_0_by_1",
@@ -1652,34 +2065,168 @@
                       },
                       "value": "0"
                     },
-                    "src": "1647:11:0",
+                    "src": "1943:16:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
                   "falseBody": null,
-                  "id": 111,
+                  "id": 125,
                   "nodeType": "IfStatement",
-                  "src": "1643:203:0",
+                  "src": "1939:79:0",
                   "trueBody": {
-                    "id": 110,
+                    "id": 124,
                     "nodeType": "Block",
-                    "src": "1660:186:0",
+                    "src": "1961:57:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 120,
+                              "name": "_relayer",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 66,
+                              "src": "1988:8:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 121,
+                              "name": "_relayer_fee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 68,
+                              "src": "1998:12:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 119,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1969:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 122,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1969:42:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 123,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1969:42:0"
+                      }
+                    ]
+                  }
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "commonType": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
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+                        "typeString": "uint256"
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+                      "subdenomination": null,
+                      "typeDescriptions": {
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+                        "typeString": "int_const 0"
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+                      "value": "0"
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+                    "typeDescriptions": {
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                     "statements": [
                       {
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                         ],
                         "declarations": [
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                             "constant": false,
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-                            "src": "1669:12:0",
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@@ -1687,10 +2234,10 @@
                               "typeString": "bool"
                             },
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+                              "id": 129,
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@@ -1701,21 +2248,21 @@
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                               "hexValue": "",
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@@ -1734,12 +2281,12 @@
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@@ -1757,18 +2304,18 @@
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-                                  "src": "1687:10:0",
+                                  "referencedDeclaration": 64,
+                                  "src": "2068:10:0",
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                                     "typeString": "address payable"
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@@ -1776,13 +2323,13 @@
                                 "memberName": "call",
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                                 "referencedDeclaration": null,
-                                "src": "1687:15:0",
+                                "src": "2068:15:0",
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                                   "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1790,13 +2337,13 @@
                               "memberName": "value",
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                               "referencedDeclaration": null,
-                              "src": "1687:21:0",
+                              "src": "2068:21:0",
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                                 "typeString": "function (uint256) pure returns (function (bytes memory) payable returns (bool,bytes memory))"
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@@ -1804,13 +2351,13 @@
                             "lValueRequested": false,
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                             "nodeType": "FunctionCall",
-                            "src": "1687:30:0",
+                            "src": "2068:30:0",
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                               "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1818,19 +2365,19 @@
                           "lValueRequested": false,
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                           "nodeType": "FunctionCall",
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                             "typeString": "tuple(bool,bytes memory)"
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@@ -1838,15 +2385,15 @@
                           "nodeType": "UnaryOperation",
                           "operator": "!",
                           "prefix": true,
-                          "src": "1733:8:0",
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-                            "src": "1734:7:0",
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@@ -1858,13 +2405,13 @@
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@@ -1872,12 +2419,12 @@
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                                       "typeString": "uint256"
@@ -1893,18 +2440,18 @@
                                   ],
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-                                    "src": "1805:8:0",
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                                       "typeString": "address payable"
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@@ -1912,13 +2459,13 @@
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                                   "referencedDeclaration": null,
-                                  "src": "1805:17:0",
+                                  "src": "2186:17:0",
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                                     "typeString": "function (uint256)"
                                   }
                                 },
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@@ -1926,15 +2473,15 @@
                                 "lValueRequested": false,
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                                 "nodeType": "FunctionCall",
-                                "src": "1805:26:0",
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                                   "typeString": "tuple()"
                                 }
                               },
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@@ -1945,23 +2492,23 @@
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             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
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@@ -1969,10 +2516,10 @@
                     "typeString": "address payable"
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+                    "id": 63,
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@@ -1984,11 +2531,11 @@
                 },
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+                  "id": 66,
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-                  "src": "1357:24:0",
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@@ -1996,10 +2543,10 @@
                     "typeString": "address payable"
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+                    "id": 65,
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                     "stateMutability": "payable",
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@@ -2011,11 +2558,11 @@
                 },
                 {
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-                  "id": 57,
-                  "name": "_fee",
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+                  "name": "_relayer_fee",
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-                  "src": "1383:12:0",
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@@ -2023,10 +2570,10 @@
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@@ -2037,11 +2584,11 @@
                 },
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@@ -2049,10 +2596,10 @@
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                       "typeString": "uint256"
@@ -2060,41 +2607,68 @@
                   },
                   "value": null,
                   "visibility": "internal"
+                },
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+                  "name": "_feeTo",
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+                  "src": "1549:14:0",
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+                  "storageLocation": "default",
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+                    "typeString": "address"
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+                    "name": "address",
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@@ -2102,10 +2676,10 @@
                         "typeString": "bool"
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@@ -2116,11 +2690,11 @@
                     },
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@@ -2128,10 +2702,10 @@
                         "typeString": "bytes"
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@@ -2141,7 +2715,7 @@
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@@ -2151,14 +2725,14 @@
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-                            "src": "2016:10:0",
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@@ -2168,12 +2742,12 @@
                           },
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                               "typeString": "address"
@@ -2181,12 +2755,12 @@
                           },
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@@ -2194,12 +2768,12 @@
                           },
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@@ -2227,18 +2801,18 @@
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-                            "referencedDeclaration": 3247,
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+                            "referencedDeclaration": 1002,
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                             "typeDescriptions": {
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                               "typeString": "abi"
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@@ -2246,13 +2820,13 @@
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                           "referencedDeclaration": null,
-                          "src": "1993:22:0",
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -2260,7 +2834,7 @@
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-                        "src": "1993:74:0",
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                           "typeString": "bytes memory"
@@ -2276,18 +2850,18 @@
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@@ -2295,13 +2869,13 @@
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-                      "src": "1982:10:0",
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@@ -2309,14 +2883,14 @@
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@@ -3034,12 +3608,12 @@
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@@ -3063,18 +3637,18 @@
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                               "typeString": "abi"
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@@ -3082,13 +3656,13 @@
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -3096,7 +3670,7 @@
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                           "typeString": "bytes memory"
@@ -3112,18 +3686,18 @@
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@@ -3131,13 +3705,13 @@
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                         "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -3145,14 +3719,14 @@
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@@ -3160,12 +3734,12 @@
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@@ -3240,7 +3814,7 @@
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@@ -3294,20 +3868,20 @@
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@@ -3319,7 +3893,7 @@
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@@ -3373,7 +3947,7 @@
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@@ -3409,21 +3983,21 @@
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@@ -3431,32 +4005,32 @@
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@@ -3469,12 +4043,12 @@
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@@ -3485,13 +4059,13 @@
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@@ -3499,14 +4073,14 @@
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@@ -3526,18 +4100,18 @@
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@@ -3559,21 +4133,21 @@
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@@ -3644,15 +4218,15 @@
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-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -4556,20 +5286,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 54,
+                        "id": 65,
                         "name": "ElementaryTypeName",
-                        "src": "1357:15:0"
+                        "src": "1484:15:0"
                       }
                     ],
-                    "id": 55,
+                    "id": 66,
                     "name": "VariableDeclaration",
-                    "src": "1357:24:0"
+                    "src": "1484:24:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
-                      "name": "_fee",
-                      "scope": 113,
+                      "name": "_relayer_fee",
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4582,20 +5312,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 56,
+                        "id": 67,
                         "name": "ElementaryTypeName",
-                        "src": "1383:7:0"
+                        "src": "1510:7:0"
                       }
                     ],
-                    "id": 57,
+                    "id": 68,
                     "name": "VariableDeclaration",
-                    "src": "1383:12:0"
+                    "src": "1510:20:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4608,19 +5338,46 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 58,
+                        "id": 69,
                         "name": "ElementaryTypeName",
-                        "src": "1397:7:0"
+                        "src": "1532:7:0"
                       }
                     ],
-                    "id": 59,
+                    "id": 70,
                     "name": "VariableDeclaration",
-                    "src": "1397:15:0"
+                    "src": "1532:15:0"
+                  },
+                  {
+                    "attributes": {
+                      "constant": false,
+                      "name": "_feeTo",
+                      "scope": 152,
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "type": "address",
+                      "value": null,
+                      "visibility": "internal"
+                    },
+                    "children": [
+                      {
+                        "attributes": {
+                          "name": "address",
+                          "stateMutability": "nonpayable",
+                          "type": "address"
+                        },
+                        "id": 71,
+                        "name": "ElementaryTypeName",
+                        "src": "1549:7:0"
+                      }
+                    ],
+                    "id": 72,
+                    "name": "VariableDeclaration",
+                    "src": "1549:14:0"
                   }
                 ],
-                "id": 60,
+                "id": 73,
                 "name": "ParameterList",
-                "src": "1328:85:0"
+                "src": "1455:109:0"
               },
               {
                 "attributes": {
@@ -4629,9 +5386,9 @@
                   ]
                 },
                 "children": [],
-                "id": 61,
+                "id": 74,
                 "name": "ParameterList",
-                "src": "1423:0:0"
+                "src": "1574:0:0"
               },
               {
                 "children": [
@@ -4665,16 +5422,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
                               ],
-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 62,
+                            "id": 75,
                             "name": "Identifier",
-                            "src": "1429:7:0"
+                            "src": "1580:7:0"
                           },
                           {
                             "attributes": {
@@ -4709,18 +5466,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3260,
+                                      "referencedDeclaration": 1015,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 63,
+                                    "id": 76,
                                     "name": "Identifier",
-                                    "src": "1437:3:0"
+                                    "src": "1588:3:0"
                                   }
                                 ],
-                                "id": 64,
+                                "id": 77,
                                 "name": "MemberAccess",
-                                "src": "1437:9:0"
+                                "src": "1588:9:0"
                               },
                               {
                                 "attributes": {
@@ -4728,18 +5485,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 59,
+                                  "referencedDeclaration": 70,
                                   "type": "uint256",
                                   "value": "_refund"
                                 },
-                                "id": 65,
+                                "id": 78,
                                 "name": "Identifier",
-                                "src": "1450:7:0"
+                                "src": "1601:7:0"
                               }
                             ],
-                            "id": 66,
+                            "id": 79,
                             "name": "BinaryOperation",
-                            "src": "1437:20:0"
+                            "src": "1588:20:0"
                           },
                           {
                             "attributes": {
@@ -4754,149 +5511,65 @@
                               "type": "literal_string \"Incorrect refund amount received by the contract\"",
                               "value": "Incorrect refund amount received by the contract"
                             },
-                            "id": 67,
+                            "id": 80,
                             "name": "Literal",
-                            "src": "1459:50:0"
+                            "src": "1610:50:0"
                           }
                         ],
-                        "id": 68,
+                        "id": 81,
                         "name": "FunctionCall",
-                        "src": "1429:81:0"
+                        "src": "1580:81:0"
                       }
                     ],
-                    "id": 69,
+                    "id": 82,
                     "name": "ExpressionStatement",
-                    "src": "1429:81:0"
-                  },
-                  {
-                    "children": [
-                      {
-                        "attributes": {
-                          "argumentTypes": null,
-                          "isConstant": false,
-                          "isLValue": false,
-                          "isPure": false,
-                          "isStructConstructorCall": false,
-                          "lValueRequested": false,
-                          "names": [
-                            null
-                          ],
-                          "type": "tuple()",
-                          "type_conversion": false
-                        },
-                        "children": [
-                          {
-                            "attributes": {
-                              "argumentTypes": [
-                                {
-                                  "typeIdentifier": "t_address_payable",
-                                  "typeString": "address payable"
-                                },
-                                {
-                                  "typeIdentifier": "t_uint256",
-                                  "typeString": "uint256"
-                                }
-                              ],
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 226,
-                              "type": "function (address,uint256)",
-                              "value": "_safeErc20Transfer"
-                            },
-                            "id": 70,
-                            "name": "Identifier",
-                            "src": "1517:18:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 53,
-                              "type": "address payable",
-                              "value": "_recipient"
-                            },
-                            "id": 71,
-                            "name": "Identifier",
-                            "src": "1536:10:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "commonType": {
-                                "typeIdentifier": "t_uint256",
-                                "typeString": "uint256"
-                              },
-                              "isConstant": false,
-                              "isLValue": false,
-                              "isPure": false,
-                              "lValueRequested": false,
-                              "operator": "-",
-                              "type": "uint256"
-                            },
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 897,
-                                  "type": "uint256",
-                                  "value": "denomination"
-                                },
-                                "id": 72,
-                                "name": "Identifier",
-                                "src": "1548:12:0"
-                              },
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 57,
-                                  "type": "uint256",
-                                  "value": "_fee"
-                                },
-                                "id": 73,
-                                "name": "Identifier",
-                                "src": "1563:4:0"
-                              }
-                            ],
-                            "id": 74,
-                            "name": "BinaryOperation",
-                            "src": "1548:19:0"
-                          }
-                        ],
-                        "id": 75,
-                        "name": "FunctionCall",
-                        "src": "1517:51:0"
-                      }
-                    ],
-                    "id": 76,
-                    "name": "ExpressionStatement",
-                    "src": "1517:51:0"
+                    "src": "1580:81:0"
                   },
                   {
                     "attributes": {
-                      "falseBody": null
+                      "assignments": [
+                        84
+                      ]
                     },
                     "children": [
+                      {
+                        "attributes": {
+                          "constant": false,
+                          "name": "feeOn",
+                          "scope": 151,
+                          "stateVariable": false,
+                          "storageLocation": "default",
+                          "type": "bool",
+                          "value": null,
+                          "visibility": "internal"
+                        },
+                        "children": [
+                          {
+                            "attributes": {
+                              "name": "bool",
+                              "type": "bool"
+                            },
+                            "id": 83,
+                            "name": "ElementaryTypeName",
+                            "src": "1668:4:0"
+                          }
+                        ],
+                        "id": 84,
+                        "name": "VariableDeclaration",
+                        "src": "1668:10:0"
+                      },
                       {
                         "attributes": {
                           "argumentTypes": null,
                           "commonType": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
+                            "typeIdentifier": "t_address",
+                            "typeString": "address"
                           },
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
-                          "operator": ">",
+                          "operator": "!=",
                           "type": "bool"
                         },
                         "children": [
@@ -4906,35 +5579,95 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 57,
-                              "type": "uint256",
-                              "value": "_fee"
+                              "referencedDeclaration": 72,
+                              "type": "address",
+                              "value": "_feeTo"
                             },
-                            "id": 77,
+                            "id": 85,
                             "name": "Identifier",
-                            "src": "1578:4:0"
+                            "src": "1681:6:0"
                           },
                           {
                             "attributes": {
                               "argumentTypes": null,
-                              "hexvalue": "30",
                               "isConstant": false,
                               "isLValue": false,
                               "isPure": true,
+                              "isStructConstructorCall": false,
                               "lValueRequested": false,
-                              "subdenomination": null,
-                              "token": "number",
-                              "type": "int_const 0",
-                              "value": "0"
+                              "names": [
+                                null
+                              ],
+                              "type": "address payable",
+                              "type_conversion": true
                             },
-                            "id": 78,
-                            "name": "Literal",
-                            "src": "1585:1:0"
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": [
+                                    {
+                                      "typeIdentifier": "t_rational_0_by_1",
+                                      "typeString": "int_const 0"
+                                    }
+                                  ],
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "type": "type(address)",
+                                  "value": "address"
+                                },
+                                "id": 86,
+                                "name": "ElementaryTypeNameExpression",
+                                "src": "1691:7:0"
+                              },
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "hexvalue": "30",
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "subdenomination": null,
+                                  "token": "number",
+                                  "type": "int_const 0",
+                                  "value": "0"
+                                },
+                                "id": 87,
+                                "name": "Literal",
+                                "src": "1699:1:0"
+                              }
+                            ],
+                            "id": 88,
+                            "name": "FunctionCall",
+                            "src": "1691:10:0"
                           }
                         ],
-                        "id": 79,
+                        "id": 89,
                         "name": "BinaryOperation",
-                        "src": "1578:8:0"
+                        "src": "1681:20:0"
+                      }
+                    ],
+                    "id": 90,
+                    "name": "VariableDeclarationStatement",
+                    "src": "1668:33:0"
+                  },
+                  {
+                    "children": [
+                      {
+                        "attributes": {
+                          "argumentTypes": null,
+                          "overloadedDeclarations": [
+                            null
+                          ],
+                          "referencedDeclaration": 84,
+                          "type": "bool",
+                          "value": "feeOn"
+                        },
+                        "id": 91,
+                        "name": "Identifier",
+                        "src": "1711:5:0"
                       },
                       {
                         "children": [
@@ -4970,13 +5703,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 226,
+                                      "referencedDeclaration": 265,
                                       "type": "function (address,uint256)",
                                       "value": "_safeErc20Transfer"
                                     },
-                                    "id": 80,
+                                    "id": 92,
                                     "name": "Identifier",
-                                    "src": "1596:18:0"
+                                    "src": "1726:18:0"
                                   },
                                   {
                                     "attributes": {
@@ -4984,47 +5717,312 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 55,
+                                      "referencedDeclaration": 64,
                                       "type": "address payable",
-                                      "value": "_relayer"
+                                      "value": "_recipient"
                                     },
-                                    "id": 81,
+                                    "id": 93,
                                     "name": "Identifier",
-                                    "src": "1615:8:0"
+                                    "src": "1745:10:0"
                                   },
                                   {
                                     "attributes": {
                                       "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 57,
-                                      "type": "uint256",
-                                      "value": "_fee"
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
                                     },
-                                    "id": 82,
-                                    "name": "Identifier",
-                                    "src": "1625:4:0"
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "commonType": {
+                                            "typeIdentifier": "t_uint256",
+                                            "typeString": "uint256"
+                                          },
+                                          "isConstant": false,
+                                          "isLValue": false,
+                                          "isPure": false,
+                                          "lValueRequested": false,
+                                          "operator": "-",
+                                          "type": "uint256"
+                                        },
+                                        "children": [
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 660,
+                                              "type": "uint256",
+                                              "value": "denomination"
+                                            },
+                                            "id": 94,
+                                            "name": "Identifier",
+                                            "src": "1757:12:0"
+                                          },
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 68,
+                                              "type": "uint256",
+                                              "value": "_relayer_fee"
+                                            },
+                                            "id": 95,
+                                            "name": "Identifier",
+                                            "src": "1772:12:0"
+                                          }
+                                        ],
+                                        "id": 96,
+                                        "name": "BinaryOperation",
+                                        "src": "1757:27:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 8,
+                                          "type": "uint256",
+                                          "value": "protocolFee"
+                                        },
+                                        "id": 97,
+                                        "name": "Identifier",
+                                        "src": "1787:11:0"
+                                      }
+                                    ],
+                                    "id": 98,
+                                    "name": "BinaryOperation",
+                                    "src": "1757:41:0"
                                   }
                                 ],
-                                "id": 83,
+                                "id": 99,
                                 "name": "FunctionCall",
-                                "src": "1596:34:0"
+                                "src": "1726:73:0"
                               }
                             ],
-                            "id": 84,
+                            "id": 100,
                             "name": "ExpressionStatement",
-                            "src": "1596:34:0"
+                            "src": "1726:73:0"
+                          },
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address",
+                                          "typeString": "address"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 101,
+                                    "name": "Identifier",
+                                    "src": "1807:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 72,
+                                      "type": "address",
+                                      "value": "_feeTo"
+                                    },
+                                    "id": 102,
+                                    "name": "Identifier",
+                                    "src": "1826:6:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 8,
+                                      "type": "uint256",
+                                      "value": "protocolFee"
+                                    },
+                                    "id": 103,
+                                    "name": "Identifier",
+                                    "src": "1834:11:0"
+                                  }
+                                ],
+                                "id": 104,
+                                "name": "FunctionCall",
+                                "src": "1807:39:0"
+                              }
+                            ],
+                            "id": 105,
+                            "name": "ExpressionStatement",
+                            "src": "1807:39:0"
                           }
                         ],
-                        "id": 85,
+                        "id": 106,
                         "name": "Block",
-                        "src": "1588:49:0"
+                        "src": "1718:135:0"
+                      },
+                      {
+                        "children": [
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 107,
+                                    "name": "Identifier",
+                                    "src": "1867:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 64,
+                                      "type": "address payable",
+                                      "value": "_recipient"
+                                    },
+                                    "id": 108,
+                                    "name": "Identifier",
+                                    "src": "1886:10:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
+                                    },
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 660,
+                                          "type": "uint256",
+                                          "value": "denomination"
+                                        },
+                                        "id": 109,
+                                        "name": "Identifier",
+                                        "src": "1898:12:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 68,
+                                          "type": "uint256",
+                                          "value": "_relayer_fee"
+                                        },
+                                        "id": 110,
+                                        "name": "Identifier",
+                                        "src": "1913:12:0"
+                                      }
+                                    ],
+                                    "id": 111,
+                                    "name": "BinaryOperation",
+                                    "src": "1898:27:0"
+                                  }
+                                ],
+                                "id": 112,
+                                "name": "FunctionCall",
+                                "src": "1867:59:0"
+                              }
+                            ],
+                            "id": 113,
+                            "name": "ExpressionStatement",
+                            "src": "1867:59:0"
+                          }
+                        ],
+                        "id": 114,
+                        "name": "Block",
+                        "src": "1859:74:0"
                       }
                     ],
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                   },
                   {
                     "attributes": {
@@ -5052,13 +6050,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 59,
+                              "referencedDeclaration": 68,
                               "type": "uint256",
-                              "value": "_refund"
+                              "value": "_relayer_fee"
                             },
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+                            "id": 116,
                             "name": "Identifier",
-                            "src": "1647:7:0"
+                            "src": "1943:12:0"
                           },
                           {
                             "attributes": {
@@ -5073,21 +6071,167 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 88,
+                            "id": 117,
                             "name": "Literal",
-                            "src": "1657:1:0"
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                           }
                         ],
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+                        "id": 118,
                         "name": "BinaryOperation",
-                        "src": "1647:11:0"
+                        "src": "1943:16:0"
+                      },
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+                          {
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+                                  "isPure": false,
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+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 119,
+                                    "name": "Identifier",
+                                    "src": "1969:18:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 66,
+                                      "type": "address payable",
+                                      "value": "_relayer"
+                                    },
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+                                    "name": "Identifier",
+                                    "src": "1988:8:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 68,
+                                      "type": "uint256",
+                                      "value": "_relayer_fee"
+                                    },
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+                                    "name": "Identifier",
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+                                  }
+                                ],
+                                "id": 122,
+                                "name": "FunctionCall",
+                                "src": "1969:42:0"
+                              }
+                            ],
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+                            "name": "ExpressionStatement",
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+                          "commonType": {
+                            "typeIdentifier": "t_uint256",
+                            "typeString": "uint256"
+                          },
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+                          "isLValue": false,
+                          "isPure": false,
+                          "lValueRequested": false,
+                          "operator": ">",
+                          "type": "bool"
+                        },
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+                              "overloadedDeclarations": [
+                                null
+                              ],
+                              "referencedDeclaration": 70,
+                              "type": "uint256",
+                              "value": "_refund"
+                            },
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+                            "name": "Identifier",
+                            "src": "2028:7:0"
+                          },
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+                              "hexvalue": "30",
+                              "isConstant": false,
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+                              "lValueRequested": false,
+                              "subdenomination": null,
+                              "token": "number",
+                              "type": "int_const 0",
+                              "value": "0"
+                            },
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+                            "name": "Literal",
+                            "src": "2038:1:0"
+                          }
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+                        "name": "BinaryOperation",
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                       {
                         "children": [
                           {
                             "attributes": {
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@@ -5096,7 +6240,7 @@
                                 "attributes": {
                                   "constant": false,
                                   "name": "success",
-                                  "scope": 110,
+                                  "scope": 149,
                                   "stateVariable": false,
                                   "storageLocation": "default",
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@@ -5109,14 +6253,14 @@
                                       "name": "bool",
                                       "type": "bool"
                                     },
-                                    "id": 90,
+                                    "id": 129,
                                     "name": "ElementaryTypeName",
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                                 "name": "VariableDeclaration",
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@@ -5188,23 +6332,23 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 53,
+                                                  "referencedDeclaration": 64,
                                                   "type": "address payable",
                                                   "value": "_recipient"
                                                 },
-                                                "id": 92,
+                                                "id": 131,
                                                 "name": "Identifier",
-                                                "src": "1687:10:0"
+                                                "src": "2068:10:0"
                                               }
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                                             "name": "MemberAccess",
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                                         "name": "MemberAccess",
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@@ -5212,18 +6356,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
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                                           "type": "uint256",
                                           "value": "_refund"
                                         },
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                                         "name": "Identifier",
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@@ -5238,19 +6382,19 @@
                                       "type": "literal_string \"\"",
                                       "value": ""
                                     },
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                                     "name": "Literal",
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+                                    "src": "2099:2:0"
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                                 "name": "FunctionCall",
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                             "name": "VariableDeclarationStatement",
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@@ -5275,18 +6419,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
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                                       "type": "bool",
                                       "value": "success"
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                                     "name": "Identifier",
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                                 "name": "UnaryOperation",
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@@ -5330,18 +6474,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
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+                                                  "referencedDeclaration": 66,
                                                   "type": "address payable",
                                                   "value": "_relayer"
                                                 },
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+                                                "id": 141,
                                                 "name": "Identifier",
-                                                "src": "1805:8:0"
+                                                "src": "2186:8:0"
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+                                            "id": 143,
                                             "name": "MemberAccess",
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@@ -5349,53 +6493,53 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 59,
+                                              "referencedDeclaration": 70,
                                               "type": "uint256",
                                               "value": "_refund"
                                             },
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                                             "name": "Identifier",
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+                                            "src": "2204:7:0"
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                                       }
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                                 "name": "Block",
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                             ],
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                             "name": "IfStatement",
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+                            "src": "2110:111:0"
                           }
                         ],
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                         "name": "Block",
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                 ],
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           {
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@@ -5407,7 +6551,7 @@
                 null
               ],
               "name": "_safeErc20TransferFrom",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
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               "visibility": "internal"
@@ -5419,7 +6563,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_from",
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5433,20 +6577,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 114,
+                        "id": 153,
                         "name": "ElementaryTypeName",
-                        "src": "1886:7:0"
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                     ],
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-                    "src": "1886:13:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_to",
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                       "type": "address",
@@ -5460,20 +6604,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 116,
+                        "id": 155,
                         "name": "ElementaryTypeName",
-                        "src": "1901:7:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 171,
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5486,19 +6630,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 118,
+                        "id": 157,
                         "name": "ElementaryTypeName",
-                        "src": "1914:7:0"
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@@ -5507,17 +6651,17 @@
                   ]
                 },
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                 "name": "ParameterList",
-                "src": "1940:0:0"
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               {
                 "children": [
                   {
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-                        123,
-                        125
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@@ -5525,7 +6669,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 170,
+                          "scope": 209,
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                           "storageLocation": "default",
                           "type": "bool",
@@ -5538,20 +6682,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 122,
+                            "id": 161,
                             "name": "ElementaryTypeName",
-                            "src": "1947:4:0"
+                            "src": "2328:4:0"
                           }
                         ],
-                        "id": 123,
+                        "id": 162,
                         "name": "VariableDeclaration",
-                        "src": "1947:12:0"
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                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 170,
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                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -5564,14 +6708,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 124,
+                            "id": 163,
                             "name": "ElementaryTypeName",
-                            "src": "1961:5:0"
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                         ],
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                         "name": "VariableDeclaration",
-                        "src": "1961:17:0"
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                         "attributes": {
@@ -5615,14 +6759,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 126,
+                                "id": 165,
                                 "name": "Identifier",
-                                "src": "1982:5:0"
+                                "src": "2363:5:0"
                               }
                             ],
-                            "id": 127,
+                            "id": 166,
                             "name": "MemberAccess",
-                            "src": "1982:10:0"
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                           {
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@@ -5674,18 +6818,18 @@
                                       "overloadedDeclarations": [
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-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
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                                       "value": "abi"
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+                                    "id": 167,
                                     "name": "Identifier",
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+                                "id": 168,
                                 "name": "MemberAccess",
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@@ -5700,9 +6844,9 @@
                                   "type": "int_const 599290589",
                                   "value": "0x23b872dd"
                                 },
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                                 "name": "Literal",
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@@ -5710,13 +6854,13 @@
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-                                  "referencedDeclaration": 115,
+                                  "referencedDeclaration": 154,
                                   "type": "address",
                                   "value": "_from"
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+                                "id": 170,
                                 "name": "Identifier",
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@@ -5724,13 +6868,13 @@
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                                 "name": "Identifier",
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                                 "attributes": {
@@ -5738,28 +6882,28 @@
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+                                  "referencedDeclaration": 158,
                                   "type": "uint256",
                                   "value": "_amount"
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                                 "name": "Identifier",
-                                "src": "2059:7:0"
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@@ -5791,16 +6935,16 @@
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                               "value": "require"
                             },
-                            "id": 137,
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                             "name": "Identifier",
-                            "src": "2074:7:0"
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@@ -5808,13 +6952,13 @@
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                             "name": "Identifier",
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@@ -5829,19 +6973,19 @@
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@@ -5881,18 +7025,18 @@
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                             "name": "MemberAccess",
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@@ -5907,14 +7051,14 @@
                               "type": "int_const 0",
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@@ -5948,16 +7092,16 @@
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+                                        1019
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+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 146,
+                                    "id": 185,
                                     "name": "Identifier",
-                                    "src": "2244:7:0"
+                                    "src": "2625:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -5992,18 +7136,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 125,
+                                              "referencedDeclaration": 164,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 147,
+                                            "id": 186,
                                             "name": "Identifier",
-                                            "src": "2252:4:0"
+                                            "src": "2633:4:0"
                                           }
                                         ],
-                                        "id": 148,
+                                        "id": 187,
                                         "name": "MemberAccess",
-                                        "src": "2252:11:0"
+                                        "src": "2633:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6018,14 +7162,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 149,
+                                        "id": 188,
                                         "name": "Literal",
-                                        "src": "2267:2:0"
+                                        "src": "2648:2:0"
                                       }
                                     ],
-                                    "id": 150,
+                                    "id": 189,
                                     "name": "BinaryOperation",
-                                    "src": "2252:17:0"
+                                    "src": "2633:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6040,19 +7184,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 151,
+                                    "id": 190,
                                     "name": "Literal",
-                                    "src": "2271:44:0"
+                                    "src": "2652:44:0"
                                   }
                                 ],
-                                "id": 152,
+                                "id": 191,
                                 "name": "FunctionCall",
-                                "src": "2244:72:0"
+                                "src": "2625:72:0"
                               }
                             ],
-                            "id": 153,
+                            "id": 192,
                             "name": "ExpressionStatement",
-                            "src": "2244:72:0"
+                            "src": "2625:72:0"
                           },
                           {
                             "children": [
@@ -6073,13 +7217,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 154,
+                                    "id": 193,
                                     "name": "Identifier",
-                                    "src": "2324:7:0"
+                                    "src": "2705:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6123,18 +7267,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 155,
+                                            "id": 194,
                                             "name": "Identifier",
-                                            "src": "2334:3:0"
+                                            "src": "2715:3:0"
                                           }
                                         ],
-                                        "id": 156,
+                                        "id": 195,
                                         "name": "MemberAccess",
-                                        "src": "2334:10:0"
+                                        "src": "2715:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6142,13 +7286,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 125,
+                                          "referencedDeclaration": 164,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 157,
+                                        "id": 196,
                                         "name": "Identifier",
-                                        "src": "2345:4:0"
+                                        "src": "2726:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -6171,29 +7315,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 158,
+                                            "id": 197,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2352:4:0"
+                                            "src": "2733:4:0"
                                           }
                                         ],
-                                        "id": 159,
+                                        "id": 198,
                                         "name": "TupleExpression",
-                                        "src": "2351:6:0"
+                                        "src": "2732:6:0"
                                       }
                                     ],
-                                    "id": 160,
+                                    "id": 199,
                                     "name": "FunctionCall",
-                                    "src": "2334:24:0"
+                                    "src": "2715:24:0"
                                   }
                                 ],
-                                "id": 161,
+                                "id": 200,
                                 "name": "Assignment",
-                                "src": "2324:34:0"
+                                "src": "2705:34:0"
                               }
                             ],
-                            "id": 162,
+                            "id": 201,
                             "name": "ExpressionStatement",
-                            "src": "2324:34:0"
+                            "src": "2705:34:0"
                           },
                           {
                             "children": [
@@ -6225,16 +7369,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 163,
+                                    "id": 202,
                                     "name": "Identifier",
-                                    "src": "2366:7:0"
+                                    "src": "2747:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6242,13 +7386,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 164,
+                                    "id": 203,
                                     "name": "Identifier",
-                                    "src": "2374:7:0"
+                                    "src": "2755:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6263,39 +7407,39 @@
                                       "type": "literal_string \"not enough allowed tokens. Token returns false.\"",
                                       "value": "not enough allowed tokens. Token returns false."
                                     },
-                                    "id": 165,
+                                    "id": 204,
                                     "name": "Literal",
-                                    "src": "2383:49:0"
+                                    "src": "2764:49:0"
                                   }
                                 ],
-                                "id": 166,
+                                "id": 205,
                                 "name": "FunctionCall",
-                                "src": "2366:67:0"
+                                "src": "2747:67:0"
                               }
                             ],
-                            "id": 167,
+                            "id": 206,
                             "name": "ExpressionStatement",
-                            "src": "2366:67:0"
+                            "src": "2747:67:0"
                           }
                         ],
-                        "id": 168,
+                        "id": 207,
                         "name": "Block",
-                        "src": "2236:204:0"
+                        "src": "2617:204:0"
                       }
                     ],
-                    "id": 169,
+                    "id": 208,
                     "name": "IfStatement",
-                    "src": "2215:225:0"
+                    "src": "2596:225:0"
                   }
                 ],
-                "id": 170,
+                "id": 209,
                 "name": "Block",
-                "src": "1940:504:0"
+                "src": "2321:504:0"
               }
             ],
-            "id": 171,
+            "id": 210,
             "name": "FunctionDefinition",
-            "src": "1854:590:0"
+            "src": "2235:590:0"
           },
           {
             "attributes": {
@@ -6307,7 +7451,7 @@
                 null
               ],
               "name": "_safeErc20Transfer",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6319,7 +7463,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_to",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -6333,20 +7477,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 172,
+                        "id": 211,
                         "name": "ElementaryTypeName",
-                        "src": "2476:7:0"
+                        "src": "2857:7:0"
                       }
                     ],
-                    "id": 173,
+                    "id": 212,
                     "name": "VariableDeclaration",
-                    "src": "2476:11:0"
+                    "src": "2857:11:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6359,19 +7503,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 174,
+                        "id": 213,
                         "name": "ElementaryTypeName",
-                        "src": "2489:7:0"
+                        "src": "2870:7:0"
                       }
                     ],
-                    "id": 175,
+                    "id": 214,
                     "name": "VariableDeclaration",
-                    "src": "2489:15:0"
+                    "src": "2870:15:0"
                   }
                 ],
-                "id": 176,
+                "id": 215,
                 "name": "ParameterList",
-                "src": "2475:30:0"
+                "src": "2856:30:0"
               },
               {
                 "attributes": {
@@ -6380,17 +7524,17 @@
                   ]
                 },
                 "children": [],
-                "id": 177,
+                "id": 216,
                 "name": "ParameterList",
-                "src": "2515:0:0"
+                "src": "2896:0:0"
               },
               {
                 "children": [
                   {
                     "attributes": {
                       "assignments": [
-                        179,
-                        181
+                        218,
+                        220
                       ]
                     },
                     "children": [
@@ -6398,7 +7542,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "bool",
@@ -6411,20 +7555,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 178,
+                            "id": 217,
                             "name": "ElementaryTypeName",
-                            "src": "2522:4:0"
+                            "src": "2903:4:0"
                           }
                         ],
-                        "id": 179,
+                        "id": 218,
                         "name": "VariableDeclaration",
-                        "src": "2522:12:0"
+                        "src": "2903:12:0"
                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -6437,14 +7581,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 180,
+                            "id": 219,
                             "name": "ElementaryTypeName",
-                            "src": "2536:5:0"
+                            "src": "2917:5:0"
                           }
                         ],
-                        "id": 181,
+                        "id": 220,
                         "name": "VariableDeclaration",
-                        "src": "2536:17:0"
+                        "src": "2917:17:0"
                       },
                       {
                         "attributes": {
@@ -6488,14 +7632,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 182,
+                                "id": 221,
                                 "name": "Identifier",
-                                "src": "2557:5:0"
+                                "src": "2938:5:0"
                               }
                             ],
-                            "id": 183,
+                            "id": 222,
                             "name": "MemberAccess",
-                            "src": "2557:10:0"
+                            "src": "2938:10:0"
                           },
                           {
                             "attributes": {
@@ -6543,18 +7687,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1002,
                                       "type": "abi",
                                       "value": "abi"
                                     },
-                                    "id": 184,
+                                    "id": 223,
                                     "name": "Identifier",
-                                    "src": "2568:3:0"
+                                    "src": "2949:3:0"
                                   }
                                 ],
-                                "id": 185,
+                                "id": 224,
                                 "name": "MemberAccess",
-                                "src": "2568:22:0"
+                                "src": "2949:22:0"
                               },
                               {
                                 "attributes": {
@@ -6569,9 +7713,9 @@
                                   "type": "int_const 2835717307",
                                   "value": "0xa9059cbb"
                                 },
-                                "id": 186,
+                                "id": 225,
                                 "name": "Literal",
-                                "src": "2591:10:0"
+                                "src": "2972:10:0"
                               },
                               {
                                 "attributes": {
@@ -6579,13 +7723,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 173,
+                                  "referencedDeclaration": 212,
                                   "type": "address",
                                   "value": "_to"
                                 },
-                                "id": 187,
+                                "id": 226,
                                 "name": "Identifier",
-                                "src": "2618:3:0"
+                                "src": "2999:3:0"
                               },
                               {
                                 "attributes": {
@@ -6593,28 +7737,28 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 175,
+                                  "referencedDeclaration": 214,
                                   "type": "uint256",
                                   "value": "_amount"
                                 },
-                                "id": 188,
+                                "id": 227,
                                 "name": "Identifier",
-                                "src": "2623:7:0"
+                                "src": "3004:7:0"
                               }
                             ],
-                            "id": 189,
+                            "id": 228,
                             "name": "FunctionCall",
-                            "src": "2568:63:0"
+                            "src": "2949:63:0"
                           }
                         ],
-                        "id": 190,
+                        "id": 229,
                         "name": "FunctionCall",
-                        "src": "2557:75:0"
+                        "src": "2938:75:0"
                       }
                     ],
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                     "name": "VariableDeclarationStatement",
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+                    "src": "2902:111:0"
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                   {
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@@ -6646,16 +7790,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1018,
+                                1019
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-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1019,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 192,
+                            "id": 231,
                             "name": "Identifier",
-                            "src": "2638:7:0"
+                            "src": "3019:7:0"
                           },
                           {
                             "attributes": {
@@ -6663,13 +7807,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 179,
+                              "referencedDeclaration": 218,
                               "type": "bool",
                               "value": "success"
                             },
-                            "id": 193,
+                            "id": 232,
                             "name": "Identifier",
-                            "src": "2646:7:0"
+                            "src": "3027:7:0"
                           },
                           {
                             "attributes": {
@@ -6684,19 +7828,19 @@
                               "type": "literal_string \"not enough tokens\"",
                               "value": "not enough tokens"
                             },
-                            "id": 194,
+                            "id": 233,
                             "name": "Literal",
-                            "src": "2655:19:0"
+                            "src": "3036:19:0"
                           }
                         ],
-                        "id": 195,
+                        "id": 234,
                         "name": "FunctionCall",
-                        "src": "2638:37:0"
+                        "src": "3019:37:0"
                       }
                     ],
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+                    "id": 235,
                     "name": "ExpressionStatement",
-                    "src": "2638:37:0"
+                    "src": "3019:37:0"
                   },
                   {
                     "attributes": {
@@ -6736,18 +7880,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 181,
+                                  "referencedDeclaration": 220,
                                   "type": "bytes memory",
                                   "value": "data"
                                 },
-                                "id": 197,
+                                "id": 236,
                                 "name": "Identifier",
-                                "src": "2775:4:0"
+                                "src": "3156:4:0"
                               }
                             ],
-                            "id": 198,
+                            "id": 237,
                             "name": "MemberAccess",
-                            "src": "2775:11:0"
+                            "src": "3156:11:0"
                           },
                           {
                             "attributes": {
@@ -6762,14 +7906,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 199,
+                            "id": 238,
                             "name": "Literal",
-                            "src": "2789:1:0"
+                            "src": "3170:1:0"
                           }
                         ],
-                        "id": 200,
+                        "id": 239,
                         "name": "BinaryOperation",
-                        "src": "2775:15:0"
+                        "src": "3156:15:0"
                       },
                       {
                         "children": [
@@ -6803,16 +7947,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 201,
+                                    "id": 240,
                                     "name": "Identifier",
-                                    "src": "2800:7:0"
+                                    "src": "3181:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6847,18 +7991,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 181,
+                                              "referencedDeclaration": 220,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 202,
+                                            "id": 241,
                                             "name": "Identifier",
-                                            "src": "2808:4:0"
+                                            "src": "3189:4:0"
                                           }
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-                                        "id": 203,
+                                        "id": 242,
                                         "name": "MemberAccess",
-                                        "src": "2808:11:0"
+                                        "src": "3189:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6873,14 +8017,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 204,
+                                        "id": 243,
                                         "name": "Literal",
-                                        "src": "2823:2:0"
+                                        "src": "3204:2:0"
                                       }
                                     ],
-                                    "id": 205,
+                                    "id": 244,
                                     "name": "BinaryOperation",
-                                    "src": "2808:17:0"
+                                    "src": "3189:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6895,19 +8039,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 206,
+                                    "id": 245,
                                     "name": "Literal",
-                                    "src": "2827:44:0"
+                                    "src": "3208:44:0"
                                   }
                                 ],
-                                "id": 207,
+                                "id": 246,
                                 "name": "FunctionCall",
-                                "src": "2800:72:0"
+                                "src": "3181:72:0"
                               }
                             ],
-                            "id": 208,
+                            "id": 247,
                             "name": "ExpressionStatement",
-                            "src": "2800:72:0"
+                            "src": "3181:72:0"
                           },
                           {
                             "children": [
@@ -6928,13 +8072,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 209,
+                                    "id": 248,
                                     "name": "Identifier",
-                                    "src": "2880:7:0"
+                                    "src": "3261:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6978,18 +8122,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1002,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 210,
+                                            "id": 249,
                                             "name": "Identifier",
-                                            "src": "2890:3:0"
+                                            "src": "3271:3:0"
                                           }
                                         ],
-                                        "id": 211,
+                                        "id": 250,
                                         "name": "MemberAccess",
-                                        "src": "2890:10:0"
+                                        "src": "3271:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6997,13 +8141,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 181,
+                                          "referencedDeclaration": 220,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 212,
+                                        "id": 251,
                                         "name": "Identifier",
-                                        "src": "2901:4:0"
+                                        "src": "3282:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -7026,29 +8170,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 213,
+                                            "id": 252,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2908:4:0"
+                                            "src": "3289:4:0"
                                           }
                                         ],
-                                        "id": 214,
+                                        "id": 253,
                                         "name": "TupleExpression",
-                                        "src": "2907:6:0"
+                                        "src": "3288:6:0"
                                       }
                                     ],
-                                    "id": 215,
+                                    "id": 254,
                                     "name": "FunctionCall",
-                                    "src": "2890:24:0"
+                                    "src": "3271:24:0"
                                   }
                                 ],
-                                "id": 216,
+                                "id": 255,
                                 "name": "Assignment",
-                                "src": "2880:34:0"
+                                "src": "3261:34:0"
                               }
                             ],
-                            "id": 217,
+                            "id": 256,
                             "name": "ExpressionStatement",
-                            "src": "2880:34:0"
+                            "src": "3261:34:0"
                           },
                           {
                             "children": [
@@ -7080,16 +8224,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1018,
+                                        1019
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1019,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 218,
+                                    "id": 257,
                                     "name": "Identifier",
-                                    "src": "2922:7:0"
+                                    "src": "3303:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7097,13 +8241,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 219,
+                                    "id": 258,
                                     "name": "Identifier",
-                                    "src": "2930:7:0"
+                                    "src": "3311:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7118,49 +8262,49 @@
                                       "type": "literal_string \"not enough tokens. Token returns false.\"",
                                       "value": "not enough tokens. Token returns false."
                                     },
-                                    "id": 220,
+                                    "id": 259,
                                     "name": "Literal",
-                                    "src": "2939:41:0"
+                                    "src": "3320:41:0"
                                   }
                                 ],
-                                "id": 221,
+                                "id": 260,
                                 "name": "FunctionCall",
-                                "src": "2922:59:0"
+                                "src": "3303:59:0"
                               }
                             ],
-                            "id": 222,
+                            "id": 261,
                             "name": "ExpressionStatement",
-                            "src": "2922:59:0"
+                            "src": "3303:59:0"
                           }
                         ],
-                        "id": 223,
+                        "id": 262,
                         "name": "Block",
-                        "src": "2792:196:0"
+                        "src": "3173:196:0"
                       }
                     ],
-                    "id": 224,
+                    "id": 263,
                     "name": "IfStatement",
-                    "src": "2771:217:0"
+                    "src": "3152:217:0"
                   }
                 ],
-                "id": 225,
+                "id": 264,
                 "name": "Block",
-                "src": "2515:477:0"
+                "src": "2896:477:0"
               }
             ],
-            "id": 226,
+            "id": 265,
             "name": "FunctionDefinition",
-            "src": "2448:544:0"
+            "src": "2829:544:0"
           }
         ],
-        "id": 227,
+        "id": 266,
         "name": "ContractDefinition",
-        "src": "805:2189:0"
+        "src": "805:2570:0"
       }
     ],
-    "id": 228,
+    "id": 267,
     "name": "SourceUnit",
-    "src": "755:2240:0"
+    "src": "755:2621:0"
   },
   "compiler": {
     "name": "solc",
@@ -7170,14 +8314,14 @@
     "42220": {
       "events": {},
       "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
+        "Hasher": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE"
       },
-      "address": "0x86FEFc3b3d4e82032A13ce41A2590dd666987780",
-      "transactionHash": "0xec93349397de563331eaa82256102fe751b05b26dd3ae4b5005d5b2ba941ee7e"
+      "address": "0xAB0931522889cD50b3519b24a2d74c825b1A3adC",
+      "transactionHash": "0x708b8ad77da6ce6a7ce2d205c83cc7e4e4aa0dcac9bf6911ee71740263a913cf"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:51:51.367Z",
+  "updatedAt": "2021-04-02T22:54:11.029Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {
diff --git a/client/contracts/CELOTornado.2.json b/client/contracts/CELOTornado.2.json
index 4a94674..bd4fb3c 100644
--- a/client/contracts/CELOTornado.2.json
+++ b/client/contracts/CELOTornado.2.json
@@ -8,6 +8,11 @@
           "name": "_verifier",
           "type": "address"
         },
+        {
+          "internalType": "contract IFeeManager",
+          "name": "_feeManager",
+          "type": "address"
+        },
         {
           "internalType": "uint256",
           "name": "_denomination",
@@ -215,6 +220,21 @@
       "stateMutability": "payable",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "feeManager",
+      "outputs": [
+        {
+          "internalType": "contract IFeeManager",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -406,6 +426,21 @@
       "stateMutability": "view",
       "type": "function"
     },
+    {
+      "constant": true,
+      "inputs": [],
+      "name": "protocolFee",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "payable": false,
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "constant": true,
       "inputs": [
@@ -539,21 +574,21 @@
       "type": "function"
     }
   ],
-  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x708938fd083239d2e9cd17e457cf25a2150bb900082fad58af8b689f786aef9c\",\"urls\":[\"bzz-raw://f345afd62002f883c60c032cd0cb051663dc8a3e59a52bf44109633b96cb3685\",\"dweb:/ipfs/QmNwjnH2uyNoq9GPjNUv6Z1mgtiR5rY3K7EHY74RBjXMpw\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0x09c70432243629ef44697fd3d0ca89d3578e2b1c9f46d90757371edb163c14da\",\"urls\":[\"bzz-raw://d2a2c9fa85c32cb15793282792cd25c71804a10aa5a911e41f3bcd07f5df117e\",\"dweb:/ipfs/QmeQ1s6ypNnP7fossR4x9svuuLjcSBtQ5spUTmWGZY5Ljr\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
+  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"contract IFeeManager\",\"name\":\"_feeManager\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"feeManager\",\"outputs\":[{\"internalType\":\"contract IFeeManager\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"protocolFee\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes\",\"name\":\"_proof\",\"type\":\"bytes\"},{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"},{\"internalType\":\"address payable\",\"name\":\"_recipient\",\"type\":\"address\"},{\"internalType\":\"address payable\",\"name\":\"_relayer\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_fee\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"_refund\",\"type\":\"uint256\"}],\"name\":\"withdraw\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"zeros\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"}],\"devdoc\":{\"methods\":{\"changeOperator(address)\":{\"details\":\"operator can change his address \"},\"deposit(bytes32)\":{\"details\":\"Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address\"},\"withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)\":{\"details\":\"Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)\"}}},\"userdoc\":{\"methods\":{}}},\"settings\":{\"compilationTarget\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":\"ERC20Tornado\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol\":{\"keccak256\":\"0x5c57c88351063f1864166162f6f32be5aebae197a18abaef8d08d67b36440a51\",\"urls\":[\"bzz-raw://6da2d6faa828b1cad43428366d273e4aa61fc176d6541fb641028985497caa0f\",\"dweb:/ipfs/QmULz388t88hr999vUk5PidTTJwbEWGUyb3d6QGnDA6qoV\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol\":{\"keccak256\":\"0x671cc9268dd70c47d18795f7e37fc4df11763fcbcca026edcf163f4239036254\",\"urls\":[\"bzz-raw://9c36a207ed164b60a514eae89bfb15e5b4de4b346c4a89a7a1cb50a940bc699d\",\"dweb:/ipfs/QmbPEqFJAGMpYduLEFsbPazyBsYWcjRtpth8X26wCHALwk\"]},\"/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol\":{\"keccak256\":\"0xe7db8acb3efcecf95c7364f447ed1764c571dbf5090fd4641fe4668a965332eb\",\"urls\":[\"bzz-raw://45e790c247c38ed8ae473e3165c1148ea10a753cf6e9f9c8742394019be2aef6\",\"dweb:/ipfs/QmaGfk1ndvqur2NvCY3TWoKuorfBVShXeykKei18GDY582\"]},\"@openzeppelin/contracts/utils/ReentrancyGuard.sol\":{\"keccak256\":\"0xb63221b23818d622bfd83d18e0968307e4fcb7a35536bdceded76e1cf8349acd\",\"urls\":[\"bzz-raw://44e1e8c22362c4708a8c3362735f1465f5b05e2f7315e16c7010d694ce019d73\",\"dweb:/ipfs/QmWj9g8X1hxkXRre2kwkEjLBetjuzmSbWHD81bsSojnBkS\"]}},\"version\":1}",
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+  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n  uint256 public protocolFee;\n\n  constructor(\n    IVerifier _verifier,\n    IFeeManager _feeManager,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _feeManager, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n    // 0.5% fee\n    protocolFee = _denomination / 200;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _relayer_fee, uint256 _refund, address _feeTo) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    bool feeOn = _feeTo != address(0);\n    if (feeOn) {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee - protocolFee);\n      _safeErc20Transfer(_feeTo, protocolFee);\n    } else {\n      _safeErc20Transfer(_recipient, denomination - _relayer_fee);\n    }\n\n    if (_relayer_fee > 0) {\n      _safeErc20Transfer(_relayer, _relayer_fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
   "sourcePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
   "ast": {
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/ERC20Tornado.sol",
     "exportedSymbols": {
       "ERC20Tornado": [
-        227
+        266
       ]
     },
-    "id": 228,
+    "id": 267,
     "nodeType": "SourceUnit",
     "nodes": [
       {
@@ -571,8 +606,8 @@
         "file": "./Tornado.sol",
         "id": 2,
         "nodeType": "ImportDirective",
-        "scope": 228,
-        "sourceUnit": 1195,
+        "scope": 267,
+        "sourceUnit": 1024,
         "src": "780:23:0",
         "symbolAliases": [],
         "unitAlias": ""
@@ -586,10 +621,10 @@
               "id": 3,
               "name": "Tornado",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1194,
+              "referencedDeclaration": 1023,
               "src": "830:7:0",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_Tornado_$1194",
+                "typeIdentifier": "t_contract$_Tornado_$1023",
                 "typeString": "contract Tornado"
               }
             },
@@ -599,19 +634,19 @@
           }
         ],
         "contractDependencies": [
-          694,
-          1194,
-          3245
+          685,
+          1023,
+          1053
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": true,
-        "id": 227,
+        "id": 266,
         "linearizedBaseContracts": [
-          227,
-          1194,
-          3245,
-          694
+          266,
+          1023,
+          1053,
+          685
         ],
         "name": "ERC20Tornado",
         "nodeType": "ContractDefinition",
@@ -621,7 +656,7 @@
             "id": 6,
             "name": "token",
             "nodeType": "VariableDeclaration",
-            "scope": 227,
+            "scope": 266,
             "src": "842:20:0",
             "stateVariable": true,
             "storageLocation": "default",
@@ -643,28 +678,54 @@
             "value": null,
             "visibility": "public"
           },
+          {
+            "constant": false,
+            "id": 8,
+            "name": "protocolFee",
+            "nodeType": "VariableDeclaration",
+            "scope": 266,
+            "src": "866:26:0",
+            "stateVariable": true,
+            "storageLocation": "default",
+            "typeDescriptions": {
+              "typeIdentifier": "t_uint256",
+              "typeString": "uint256"
+            },
+            "typeName": {
+              "id": 7,
+              "name": "uint256",
+              "nodeType": "ElementaryTypeName",
+              "src": "866:7:0",
+              "typeDescriptions": {
+                "typeIdentifier": "t_uint256",
+                "typeString": "uint256"
+              }
+            },
+            "value": null,
+            "visibility": "public"
+          },
           {
             "body": {
-              "id": 29,
+              "id": 40,
               "nodeType": "Block",
-              "src": "1079:25:0",
+              "src": "1151:80:0",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 27,
+                    "id": 32,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 25,
+                      "id": 30,
                       "name": "token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
                       "referencedDeclaration": 6,
-                      "src": "1085:5:0",
+                      "src": "1157:5:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -674,31 +735,114 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 26,
+                      "id": 31,
                       "name": "_token",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 16,
-                      "src": "1093:6:0",
+                      "referencedDeclaration": 20,
+                      "src": "1165:6:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1085:14:0",
+                    "src": "1157:14:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
-                  "id": 28,
+                  "id": 33,
                   "nodeType": "ExpressionStatement",
-                  "src": "1085:14:0"
+                  "src": "1157:14:0"
+                },
+                {
+                  "expression": {
+                    "argumentTypes": null,
+                    "id": 38,
+                    "isConstant": false,
+                    "isLValue": false,
+                    "isPure": false,
+                    "lValueRequested": false,
+                    "leftHandSide": {
+                      "argumentTypes": null,
+                      "id": 34,
+                      "name": "protocolFee",
+                      "nodeType": "Identifier",
+                      "overloadedDeclarations": [],
+                      "referencedDeclaration": 8,
+                      "src": "1193:11:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "nodeType": "Assignment",
+                    "operator": "=",
+                    "rightHandSide": {
+                      "argumentTypes": null,
+                      "commonType": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      },
+                      "id": 37,
+                      "isConstant": false,
+                      "isLValue": false,
+                      "isPure": false,
+                      "lValueRequested": false,
+                      "leftExpression": {
+                        "argumentTypes": null,
+                        "id": 35,
+                        "name": "_denomination",
+                        "nodeType": "Identifier",
+                        "overloadedDeclarations": [],
+                        "referencedDeclaration": 14,
+                        "src": "1207:13:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_uint256",
+                          "typeString": "uint256"
+                        }
+                      },
+                      "nodeType": "BinaryOperation",
+                      "operator": "/",
+                      "rightExpression": {
+                        "argumentTypes": null,
+                        "hexValue": "323030",
+                        "id": 36,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "kind": "number",
+                        "lValueRequested": false,
+                        "nodeType": "Literal",
+                        "src": "1223:3:0",
+                        "subdenomination": null,
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_rational_200_by_1",
+                          "typeString": "int_const 200"
+                        },
+                        "value": "200"
+                      },
+                      "src": "1207:19:0",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_uint256",
+                        "typeString": "uint256"
+                      }
+                    },
+                    "src": "1193:33:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
+                  },
+                  "id": 39,
+                  "nodeType": "ExpressionStatement",
+                  "src": "1193:33:0"
                 }
               ]
             },
             "documentation": null,
-            "id": 30,
+            "id": 41,
             "implemented": true,
             "kind": "constructor",
             "modifiers": [
@@ -706,25 +850,38 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 19,
+                    "id": 23,
                     "name": "_verifier",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 8,
-                    "src": "1016:9:0",
+                    "referencedDeclaration": 10,
+                    "src": "1075:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
                   {
                     "argumentTypes": null,
-                    "id": 20,
+                    "id": 24,
+                    "name": "_feeManager",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 12,
+                    "src": "1086:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  {
+                    "argumentTypes": null,
+                    "id": 25,
                     "name": "_denomination",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
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-                    "src": "1027:13:0",
+                    "referencedDeclaration": 14,
+                    "src": "1099:13:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -732,12 +889,12 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 21,
+                    "id": 26,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 12,
-                    "src": "1042:17:0",
+                    "referencedDeclaration": 16,
+                    "src": "1114:17:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -745,103 +902,131 @@
                   },
                   {
                     "argumentTypes": null,
-                    "id": 22,
+                    "id": 27,
                     "name": "_operator",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 14,
-                    "src": "1061:9:0",
+                    "referencedDeclaration": 18,
+                    "src": "1133:9:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   }
                 ],
-                "id": 23,
+                "id": 28,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 18,
+                  "id": 22,
                   "name": "Tornado",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 1194,
-                  "src": "1008:7:0",
+                  "referencedDeclaration": 1023,
+                  "src": "1067:7:0",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_Tornado_$1194_$",
+                    "typeIdentifier": "t_type$_t_contract$_Tornado_$1023_$",
                     "typeString": "type(contract Tornado)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1008:63:0"
+                "src": "1067:76:0"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 17,
+              "id": 21,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 8,
+                  "id": 10,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "884:19:0",
+                  "scope": 41,
+                  "src": "914:19:0",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$891",
+                    "typeIdentifier": "t_contract$_IVerifier_$701",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 7,
+                    "id": 9,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 891,
-                    "src": "884:9:0",
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+                    "src": "914:9:0",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$891",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
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                   "visibility": "internal"
                 },
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-                  "constant": false,
-                  "id": 10,
-                  "name": "_denomination",
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-                  "src": "909:21:0",
-                  "stateVariable": false,
-                  "storageLocation": "default",
-                  "typeDescriptions": {
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-                    "typeString": "uint256"
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-                    "name": "uint256",
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-                    "typeDescriptions": {
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-                      "typeString": "uint256"
-                    }
-                  },
-                  "value": null,
-                  "visibility": "internal"
-                },
                 {
                   "constant": false,
                   "id": 12,
+                  "name": "_feeManager",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "939:23:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_contract$_IFeeManager_$707",
+                    "typeString": "contract IFeeManager"
+                  },
+                  "typeName": {
+                    "contractScope": null,
+                    "id": 11,
+                    "name": "IFeeManager",
+                    "nodeType": "UserDefinedTypeName",
+                    "referencedDeclaration": 707,
+                    "src": "939:11:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
+                      "typeString": "contract IFeeManager"
+                    }
+                  },
+                  "value": null,
+                  "visibility": "internal"
+                },
+                {
+                  "constant": false,
+                  "id": 14,
+                  "name": "_denomination",
+                  "nodeType": "VariableDeclaration",
+                  "scope": 41,
+                  "src": "968:21:0",
+                  "stateVariable": false,
+                  "storageLocation": "default",
+                  "typeDescriptions": {
+                    "typeIdentifier": "t_uint256",
+                    "typeString": "uint256"
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+                    "name": "uint256",
+                    "nodeType": "ElementaryTypeName",
+                    "src": "968:7:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
+                    }
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+                  "visibility": "internal"
+                },
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                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "936:24:0",
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+                  "src": "995:24:0",
                   "stateVariable": false,
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@@ -849,10 +1034,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
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+                    "id": 15,
                     "name": "uint32",
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-                    "src": "936:6:0",
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                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -863,11 +1048,11 @@
                 },
                 {
                   "constant": false,
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                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "966:17:0",
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+                  "src": "1025:17:0",
                   "stateVariable": false,
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@@ -875,10 +1060,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 13,
+                    "id": 17,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "966:7:0",
+                    "src": "1025:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -890,11 +1075,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 16,
+                  "id": 20,
                   "name": "_token",
                   "nodeType": "VariableDeclaration",
-                  "scope": 30,
-                  "src": "989:14:0",
+                  "scope": 41,
+                  "src": "1048:14:0",
                   "stateVariable": false,
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@@ -902,10 +1087,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 15,
+                    "id": 19,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "989:7:0",
+                    "src": "1048:7:0",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -916,25 +1101,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "878:129:0"
+              "src": "908:158:0"
             },
             "returnParameters": {
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               "nodeType": "ParameterList",
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-              "src": "1079:0:0"
+              "src": "1151:0:0"
             },
-            "scope": 227,
-            "src": "867:237:0",
+            "scope": 266,
+            "src": "897:334:0",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 50,
+              "id": 61,
               "nodeType": "Block",
-              "src": "1144:155:0",
+              "src": "1271:155:0",
               "statements": [
                 {
                   "expression": {
@@ -946,7 +1131,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 37,
+                        "id": 48,
                         "isConstant": false,
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@@ -955,18 +1140,18 @@
                           "argumentTypes": null,
                           "expression": {
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-                            "id": 34,
+                            "id": 45,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3260,
-                            "src": "1158:3:0",
+                            "referencedDeclaration": 1068,
+                            "src": "1285:3:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 35,
+                          "id": 46,
                           "isConstant": false,
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@@ -974,7 +1159,7 @@
                           "memberName": "value",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "1158:9:0",
+                          "src": "1285:9:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -985,14 +1170,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 36,
+                          "id": 47,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1171:1:0",
+                          "src": "1298:1:0",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -1000,7 +1185,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1158:14:0",
+                        "src": "1285:14:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1009,14 +1194,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4554482076616c756520697320737570706f73656420746f206265203020666f7220455243323020696e7374616e6365",
-                        "id": 38,
+                        "id": 49,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1174:50:0",
+                        "src": "1301:50:0",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_b14b0818f1fdc710b92ba7e1ce725992b43e47a5b220b1b890f352eeac2e1d5e",
@@ -1036,21 +1221,21 @@
                           "typeString": "literal_string \"ETH value is supposed to be 0 for ERC20 instance\""
                         }
                       ],
-                      "id": 33,
+                      "id": 44,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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-                        3264
+                        1071,
+                        1072
                       ],
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-                      "src": "1150:7:0",
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+                      "src": "1277:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
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+                    "id": 50,
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@@ -1058,15 +1243,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1150:75:0",
+                    "src": "1277:75:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
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                   "expression": {
@@ -1076,18 +1261,18 @@
                         "argumentTypes": null,
                         "expression": {
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-                          "id": 42,
+                          "id": 53,
                           "name": "msg",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 3260,
-                          "src": "1254:3:0",
+                          "referencedDeclaration": 1068,
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                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_message",
                             "typeString": "msg"
                           }
                         },
-                        "id": 43,
+                        "id": 54,
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@@ -1095,7 +1280,7 @@
                         "memberName": "sender",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "1254:10:0",
+                        "src": "1381:10:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -1106,14 +1291,14 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 45,
+                            "id": 56,
                             "name": "this",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 3284,
-                            "src": "1274:4:0",
+                            "referencedDeclaration": 1094,
+                            "src": "1401:4:0",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           }
@@ -1121,24 +1306,24 @@
                         "expression": {
                           "argumentTypes": [
                             {
-                              "typeIdentifier": "t_contract$_ERC20Tornado_$227",
+                              "typeIdentifier": "t_contract$_ERC20Tornado_$266",
                               "typeString": "contract ERC20Tornado"
                             }
                           ],
-                          "id": 44,
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                           "isPure": true,
                           "lValueRequested": false,
                           "nodeType": "ElementaryTypeNameExpression",
-                          "src": "1266:7:0",
+                          "src": "1393:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_type$_t_address_$",
                             "typeString": "type(address)"
                           },
                           "typeName": "address"
                         },
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@@ -1146,7 +1331,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "1266:13:0",
+                        "src": "1393:13:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -1154,12 +1339,12 @@
                       },
                       {
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+                        "id": 58,
                         "name": "denomination",
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                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 897,
-                        "src": "1281:12:0",
+                        "referencedDeclaration": 713,
+                        "src": "1408:12:0",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1181,18 +1366,18 @@
                           "typeString": "uint256"
                         }
                       ],
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+                      "id": 52,
                       "name": "_safeErc20TransferFrom",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 171,
-                      "src": "1231:22:0",
+                      "referencedDeclaration": 210,
+                      "src": "1358:22:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,address,uint256)"
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                     },
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@@ -1200,48 +1385,48 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1231:63:0",
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                     "typeDescriptions": {
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                       "typeString": "tuple()"
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             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
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-              "src": "1132:2:0"
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+            "src": "1235:191:0",
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@@ -1253,7 +1438,7 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
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@@ -1262,18 +1447,18 @@
                           "argumentTypes": null,
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-                            "id": 63,
+                            "id": 76,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
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-                            "src": "1437:3:0",
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                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
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@@ -1281,7 +1466,7 @@
                           "memberName": "value",
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                           "referencedDeclaration": null,
-                          "src": "1437:9:0",
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@@ -1291,18 +1476,18 @@
                         "operator": "==",
                         "rightExpression": {
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-                          "id": 65,
+                          "id": 78,
                           "name": "_refund",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 59,
-                          "src": "1450:7:0",
+                          "referencedDeclaration": 70,
+                          "src": "1601:7:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "1437:20:0",
+                        "src": "1588:20:0",
                         "typeDescriptions": {
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@@ -1311,14 +1496,14 @@
                       {
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1459:50:0",
+                        "src": "1610:50:0",
                         "subdenomination": null,
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@@ -1338,21 +1523,21 @@
                           "typeString": "literal_string \"Incorrect refund amount received by the contract\""
                         }
                       ],
-                      "id": 62,
+                      "id": 75,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1071,
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+                      "src": "1580:7:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
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@@ -1360,178 +1545,158 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1429:81:0",
+                    "src": "1580:81:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 69,
+                  "id": 82,
                   "nodeType": "ExpressionStatement",
-                  "src": "1429:81:0"
+                  "src": "1580:81:0"
                 },
                 {
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-                    "arguments": [
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-                        "argumentTypes": null,
-                        "id": 71,
-                        "name": "_recipient",
-                        "nodeType": "Identifier",
-                        "overloadedDeclarations": [],
-                        "referencedDeclaration": 53,
-                        "src": "1536:10:0",
+                  "assignments": [
+                    84
+                  ],
+                  "declarations": [
+                    {
+                      "constant": false,
+                      "id": 84,
+                      "name": "feeOn",
+                      "nodeType": "VariableDeclaration",
+                      "scope": 151,
+                      "src": "1668:10:0",
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "typeDescriptions": {
+                        "typeIdentifier": "t_bool",
+                        "typeString": "bool"
+                      },
+                      "typeName": {
+                        "id": 83,
+                        "name": "bool",
+                        "nodeType": "ElementaryTypeName",
+                        "src": "1668:4:0",
                         "typeDescriptions": {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
+                          "typeIdentifier": "t_bool",
+                          "typeString": "bool"
                         }
                       },
-                      {
-                        "argumentTypes": null,
-                        "commonType": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        },
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-                        "isPure": false,
-                        "lValueRequested": false,
-                        "leftExpression": {
-                          "argumentTypes": null,
-                          "id": 72,
-                          "name": "denomination",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 897,
-                          "src": "1548:12:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "nodeType": "BinaryOperation",
-                        "operator": "-",
-                        "rightExpression": {
-                          "argumentTypes": null,
-                          "id": 73,
-                          "name": "_fee",
-                          "nodeType": "Identifier",
-                          "overloadedDeclarations": [],
-                          "referencedDeclaration": 57,
-                          "src": "1563:4:0",
-                          "typeDescriptions": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
-                          }
-                        },
-                        "src": "1548:19:0",
-                        "typeDescriptions": {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
-                      }
-                    ],
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-                      "argumentTypes": [
-                        {
-                          "typeIdentifier": "t_address_payable",
-                          "typeString": "address payable"
-                        },
-                        {
-                          "typeIdentifier": "t_uint256",
-                          "typeString": "uint256"
-                        }
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-                      "src": "1517:18:0",
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-                        "typeString": "function (address,uint256)"
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-                    "src": "1517:51:0",
-                    "typeDescriptions": {
-                      "typeIdentifier": "t_tuple$__$",
-                      "typeString": "tuple()"
+                      "value": null,
+                      "visibility": "internal"
                     }
-                  },
-                  "id": 76,
-                  "nodeType": "ExpressionStatement",
-                  "src": "1517:51:0"
-                },
-                {
-                  "condition": {
+                  ],
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+                  "initialValue": {
                     "argumentTypes": null,
                     "commonType": {
-                      "typeIdentifier": "t_uint256",
-                      "typeString": "uint256"
+                      "typeIdentifier": "t_address",
+                      "typeString": "address"
                     },
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                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 77,
-                      "name": "_fee",
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+                      "name": "_feeTo",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 57,
-                      "src": "1578:4:0",
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+                      "src": "1681:6:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_uint256",
-                        "typeString": "uint256"
+                        "typeIdentifier": "t_address",
+                        "typeString": "address"
                       }
                     },
                     "nodeType": "BinaryOperation",
-                    "operator": ">",
+                    "operator": "!=",
                     "rightExpression": {
                       "argumentTypes": null,
-                      "hexValue": "30",
-                      "id": 78,
+                      "arguments": [
+                        {
+                          "argumentTypes": null,
+                          "hexValue": "30",
+                          "id": 87,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": true,
+                          "kind": "number",
+                          "lValueRequested": false,
+                          "nodeType": "Literal",
+                          "src": "1699:1:0",
+                          "subdenomination": null,
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          },
+                          "value": "0"
+                        }
+                      ],
+                      "expression": {
+                        "argumentTypes": [
+                          {
+                            "typeIdentifier": "t_rational_0_by_1",
+                            "typeString": "int_const 0"
+                          }
+                        ],
+                        "id": 86,
+                        "isConstant": false,
+                        "isLValue": false,
+                        "isPure": true,
+                        "lValueRequested": false,
+                        "nodeType": "ElementaryTypeNameExpression",
+                        "src": "1691:7:0",
+                        "typeDescriptions": {
+                          "typeIdentifier": "t_type$_t_address_$",
+                          "typeString": "type(address)"
+                        },
+                        "typeName": "address"
+                      },
+                      "id": 88,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
-                      "kind": "number",
+                      "kind": "typeConversion",
                       "lValueRequested": false,
-                      "nodeType": "Literal",
-                      "src": "1585:1:0",
-                      "subdenomination": null,
+                      "names": [],
+                      "nodeType": "FunctionCall",
+                      "src": "1691:10:0",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_rational_0_by_1",
-                        "typeString": "int_const 0"
-                      },
-                      "value": "0"
+                        "typeIdentifier": "t_address_payable",
+                        "typeString": "address payable"
+                      }
                     },
-                    "src": "1578:8:0",
+                    "src": "1681:20:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
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-                  "id": 86,
-                  "nodeType": "IfStatement",
-                  "src": "1574:63:0",
-                  "trueBody": {
-                    "id": 85,
+                  "nodeType": "VariableDeclarationStatement",
+                  "src": "1668:33:0"
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "id": 91,
+                    "name": "feeOn",
+                    "nodeType": "Identifier",
+                    "overloadedDeclarations": [],
+                    "referencedDeclaration": 84,
+                    "src": "1711:5:0",
+                    "typeDescriptions": {
+                      "typeIdentifier": "t_bool",
+                      "typeString": "bool"
+                    }
+                  },
+                  "falseBody": {
+                    "id": 114,
                     "nodeType": "Block",
-                    "src": "1588:49:0",
+                    "src": "1859:74:0",
                     "statements": [
                       {
                         "expression": {
@@ -1539,12 +1704,12 @@
                           "arguments": [
                             {
                               "argumentTypes": null,
-                              "id": 81,
-                              "name": "_relayer",
+                              "id": 108,
+                              "name": "_recipient",
                               "nodeType": "Identifier",
                               "overloadedDeclarations": [],
-                              "referencedDeclaration": 55,
-                              "src": "1615:8:0",
+                              "referencedDeclaration": 64,
+                              "src": "1886:10:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_address_payable",
                                 "typeString": "address payable"
@@ -1552,12 +1717,44 @@
                             },
                             {
                               "argumentTypes": null,
-                              "id": 82,
-                              "name": "_fee",
-                              "nodeType": "Identifier",
-                              "overloadedDeclarations": [],
-                              "referencedDeclaration": 57,
-                              "src": "1625:4:0",
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 111,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "id": 109,
+                                "name": "denomination",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 713,
+                                "src": "1898:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 110,
+                                "name": "_relayer_fee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 68,
+                                "src": "1913:12:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1898:27:0",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_uint256",
                                 "typeString": "uint256"
@@ -1575,18 +1772,18 @@
                                 "typeString": "uint256"
                               }
                             ],
-                            "id": 80,
+                            "id": 107,
                             "name": "_safeErc20Transfer",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 226,
-                            "src": "1596:18:0",
+                            "referencedDeclaration": 265,
+                            "src": "1867:18:0",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
                               "typeString": "function (address,uint256)"
                             }
                           },
-                          "id": 83,
+                          "id": 112,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -1594,15 +1791,231 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "1596:34:0",
+                          "src": "1867:59:0",
                           "typeDescriptions": {
                             "typeIdentifier": "t_tuple$__$",
                             "typeString": "tuple()"
                           }
                         },
-                        "id": 84,
+                        "id": 113,
                         "nodeType": "ExpressionStatement",
-                        "src": "1596:34:0"
+                        "src": "1867:59:0"
+                      }
+                    ]
+                  },
+                  "id": 115,
+                  "nodeType": "IfStatement",
+                  "src": "1707:226:0",
+                  "trueBody": {
+                    "id": 106,
+                    "nodeType": "Block",
+                    "src": "1718:135:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 93,
+                              "name": "_recipient",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 64,
+                              "src": "1745:10:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "commonType": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              },
+                              "id": 98,
+                              "isConstant": false,
+                              "isLValue": false,
+                              "isPure": false,
+                              "lValueRequested": false,
+                              "leftExpression": {
+                                "argumentTypes": null,
+                                "commonType": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                },
+                                "id": 96,
+                                "isConstant": false,
+                                "isLValue": false,
+                                "isPure": false,
+                                "lValueRequested": false,
+                                "leftExpression": {
+                                  "argumentTypes": null,
+                                  "id": 94,
+                                  "name": "denomination",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 713,
+                                  "src": "1757:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "nodeType": "BinaryOperation",
+                                "operator": "-",
+                                "rightExpression": {
+                                  "argumentTypes": null,
+                                  "id": 95,
+                                  "name": "_relayer_fee",
+                                  "nodeType": "Identifier",
+                                  "overloadedDeclarations": [],
+                                  "referencedDeclaration": 68,
+                                  "src": "1772:12:0",
+                                  "typeDescriptions": {
+                                    "typeIdentifier": "t_uint256",
+                                    "typeString": "uint256"
+                                  }
+                                },
+                                "src": "1757:27:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "nodeType": "BinaryOperation",
+                              "operator": "-",
+                              "rightExpression": {
+                                "argumentTypes": null,
+                                "id": 97,
+                                "name": "protocolFee",
+                                "nodeType": "Identifier",
+                                "overloadedDeclarations": [],
+                                "referencedDeclaration": 8,
+                                "src": "1787:11:0",
+                                "typeDescriptions": {
+                                  "typeIdentifier": "t_uint256",
+                                  "typeString": "uint256"
+                                }
+                              },
+                              "src": "1757:41:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 92,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1726:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 99,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1726:73:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 100,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1726:73:0"
+                      },
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 102,
+                              "name": "_feeTo",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 72,
+                              "src": "1826:6:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 103,
+                              "name": "protocolFee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 8,
+                              "src": "1834:11:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address",
+                                "typeString": "address"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 101,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1807:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 104,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1807:39:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 105,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1807:39:0"
                       }
                     ]
                   }
@@ -1614,19 +2027,19 @@
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     },
-                    "id": 89,
+                    "id": 118,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 87,
-                      "name": "_refund",
+                      "id": 116,
+                      "name": "_relayer_fee",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 59,
-                      "src": "1647:7:0",
+                      "referencedDeclaration": 68,
+                      "src": "1943:12:0",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1637,14 +2050,14 @@
                     "rightExpression": {
                       "argumentTypes": null,
                       "hexValue": "30",
-                      "id": 88,
+                      "id": 117,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "1657:1:0",
+                      "src": "1958:1:0",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_0_by_1",
@@ -1652,34 +2065,168 @@
                       },
                       "value": "0"
                     },
-                    "src": "1647:11:0",
+                    "src": "1943:16:0",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
                   "falseBody": null,
-                  "id": 111,
+                  "id": 125,
                   "nodeType": "IfStatement",
-                  "src": "1643:203:0",
+                  "src": "1939:79:0",
                   "trueBody": {
-                    "id": 110,
+                    "id": 124,
                     "nodeType": "Block",
-                    "src": "1660:186:0",
+                    "src": "1961:57:0",
+                    "statements": [
+                      {
+                        "expression": {
+                          "argumentTypes": null,
+                          "arguments": [
+                            {
+                              "argumentTypes": null,
+                              "id": 120,
+                              "name": "_relayer",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 66,
+                              "src": "1988:8:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              }
+                            },
+                            {
+                              "argumentTypes": null,
+                              "id": 121,
+                              "name": "_relayer_fee",
+                              "nodeType": "Identifier",
+                              "overloadedDeclarations": [],
+                              "referencedDeclaration": 68,
+                              "src": "1998:12:0",
+                              "typeDescriptions": {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            }
+                          ],
+                          "expression": {
+                            "argumentTypes": [
+                              {
+                                "typeIdentifier": "t_address_payable",
+                                "typeString": "address payable"
+                              },
+                              {
+                                "typeIdentifier": "t_uint256",
+                                "typeString": "uint256"
+                              }
+                            ],
+                            "id": 119,
+                            "name": "_safeErc20Transfer",
+                            "nodeType": "Identifier",
+                            "overloadedDeclarations": [],
+                            "referencedDeclaration": 265,
+                            "src": "1969:18:0",
+                            "typeDescriptions": {
+                              "typeIdentifier": "t_function_internal_nonpayable$_t_address_$_t_uint256_$returns$__$",
+                              "typeString": "function (address,uint256)"
+                            }
+                          },
+                          "id": 122,
+                          "isConstant": false,
+                          "isLValue": false,
+                          "isPure": false,
+                          "kind": "functionCall",
+                          "lValueRequested": false,
+                          "names": [],
+                          "nodeType": "FunctionCall",
+                          "src": "1969:42:0",
+                          "typeDescriptions": {
+                            "typeIdentifier": "t_tuple$__$",
+                            "typeString": "tuple()"
+                          }
+                        },
+                        "id": 123,
+                        "nodeType": "ExpressionStatement",
+                        "src": "1969:42:0"
+                      }
+                    ]
+                  }
+                },
+                {
+                  "condition": {
+                    "argumentTypes": null,
+                    "commonType": {
+                      "typeIdentifier": "t_uint256",
+                      "typeString": "uint256"
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+                        "typeString": "uint256"
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+                      "subdenomination": null,
+                      "typeDescriptions": {
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+                        "typeString": "int_const 0"
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+                      "value": "0"
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+                    "typeDescriptions": {
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+                      "typeString": "bool"
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                     "statements": [
                       {
                         "assignments": [
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                         ],
                         "declarations": [
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                             "constant": false,
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-                            "src": "1669:12:0",
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@@ -1687,10 +2234,10 @@
                               "typeString": "bool"
                             },
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+                              "id": 129,
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@@ -1701,21 +2248,21 @@
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                         ],
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@@ -1734,12 +2281,12 @@
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@@ -1757,18 +2304,18 @@
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-                                  "src": "1687:10:0",
+                                  "referencedDeclaration": 64,
+                                  "src": "2068:10:0",
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                                     "typeString": "address payable"
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@@ -1776,13 +2323,13 @@
                                 "memberName": "call",
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                                 "referencedDeclaration": null,
-                                "src": "1687:15:0",
+                                "src": "2068:15:0",
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                                   "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1790,13 +2337,13 @@
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                               "referencedDeclaration": null,
-                              "src": "1687:21:0",
+                              "src": "2068:21:0",
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                                 "typeString": "function (uint256) pure returns (function (bytes memory) payable returns (bool,bytes memory))"
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@@ -1804,13 +2351,13 @@
                             "lValueRequested": false,
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                             "nodeType": "FunctionCall",
-                            "src": "1687:30:0",
+                            "src": "2068:30:0",
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                               "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -1818,19 +2365,19 @@
                           "lValueRequested": false,
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                           "nodeType": "FunctionCall",
-                          "src": "1687:34:0",
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                             "typeString": "tuple(bool,bytes memory)"
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@@ -1838,15 +2385,15 @@
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                           "operator": "!",
                           "prefix": true,
-                          "src": "1733:8:0",
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-                            "src": "1734:7:0",
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@@ -1858,13 +2405,13 @@
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@@ -1872,12 +2419,12 @@
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                                       "typeString": "uint256"
@@ -1893,18 +2440,18 @@
                                   ],
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-                                    "src": "1805:8:0",
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                                       "typeString": "address payable"
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@@ -1912,13 +2459,13 @@
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                                   "referencedDeclaration": null,
-                                  "src": "1805:17:0",
+                                  "src": "2186:17:0",
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                                     "typeString": "function (uint256)"
                                   }
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@@ -1926,15 +2473,15 @@
                                 "lValueRequested": false,
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                                 "nodeType": "FunctionCall",
-                                "src": "1805:26:0",
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                                   "typeString": "tuple()"
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                               },
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@@ -1945,23 +2492,23 @@
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             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
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@@ -1969,10 +2516,10 @@
                     "typeString": "address payable"
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+                    "id": 63,
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@@ -1984,11 +2531,11 @@
                 },
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+                  "id": 66,
                   "name": "_relayer",
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-                  "src": "1357:24:0",
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@@ -1996,10 +2543,10 @@
                     "typeString": "address payable"
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+                    "id": 65,
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                     "stateMutability": "payable",
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@@ -2011,11 +2558,11 @@
                 },
                 {
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-                  "id": 57,
-                  "name": "_fee",
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+                  "name": "_relayer_fee",
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-                  "src": "1383:12:0",
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@@ -2023,10 +2570,10 @@
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@@ -2037,11 +2584,11 @@
                 },
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@@ -2049,10 +2596,10 @@
                     "typeString": "uint256"
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                       "typeString": "uint256"
@@ -2060,41 +2607,68 @@
                   },
                   "value": null,
                   "visibility": "internal"
+                },
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+                  "name": "_feeTo",
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+                  "src": "1549:14:0",
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+                  "storageLocation": "default",
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+                    "typeString": "address"
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+                    "name": "address",
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@@ -2102,10 +2676,10 @@
                         "typeString": "bool"
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@@ -2116,11 +2690,11 @@
                     },
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@@ -2128,10 +2702,10 @@
                         "typeString": "bytes"
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@@ -2141,7 +2715,7 @@
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@@ -2151,14 +2725,14 @@
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-                            "src": "2016:10:0",
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@@ -2168,12 +2742,12 @@
                           },
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@@ -2181,12 +2755,12 @@
                           },
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@@ -2194,12 +2768,12 @@
                           },
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@@ -2227,18 +2801,18 @@
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-                            "referencedDeclaration": 3247,
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+                            "referencedDeclaration": 1055,
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                             "typeDescriptions": {
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                               "typeString": "abi"
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@@ -2246,13 +2820,13 @@
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                           "referencedDeclaration": null,
-                          "src": "1993:22:0",
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -2260,7 +2834,7 @@
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-                        "src": "1993:74:0",
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                           "typeString": "bytes memory"
@@ -2276,18 +2850,18 @@
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@@ -2295,13 +2869,13 @@
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-                      "src": "1982:10:0",
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@@ -2309,14 +2883,14 @@
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@@ -3034,12 +3608,12 @@
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                               "typeString": "uint256"
@@ -3063,18 +3637,18 @@
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                               "typeString": "abi"
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@@ -3082,13 +3656,13 @@
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                             "typeString": "function (bytes4) pure returns (bytes memory)"
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@@ -3096,7 +3670,7 @@
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                           "typeString": "bytes memory"
@@ -3112,18 +3686,18 @@
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@@ -3131,13 +3705,13 @@
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                         "typeString": "function (bytes memory) payable returns (bool,bytes memory)"
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@@ -3145,14 +3719,14 @@
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                       "typeString": "tuple(bool,bytes memory)"
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@@ -3160,12 +3734,12 @@
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@@ -3223,15 +3797,15 @@
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@@ -3240,7 +3814,7 @@
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@@ -3294,20 +3868,20 @@
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@@ -3319,7 +3893,7 @@
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@@ -3373,7 +3947,7 @@
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@@ -3409,21 +3983,21 @@
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@@ -3431,32 +4005,32 @@
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@@ -3469,12 +4043,12 @@
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@@ -3485,13 +4059,13 @@
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@@ -3499,14 +4073,14 @@
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@@ -3526,18 +4100,18 @@
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@@ -3545,13 +4119,13 @@
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@@ -3559,21 +4133,21 @@
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@@ -3644,15 +4218,15 @@
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-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -4556,20 +5286,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 54,
+                        "id": 65,
                         "name": "ElementaryTypeName",
-                        "src": "1357:15:0"
+                        "src": "1484:15:0"
                       }
                     ],
-                    "id": 55,
+                    "id": 66,
                     "name": "VariableDeclaration",
-                    "src": "1357:24:0"
+                    "src": "1484:24:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
-                      "name": "_fee",
-                      "scope": 113,
+                      "name": "_relayer_fee",
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4582,20 +5312,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 56,
+                        "id": 67,
                         "name": "ElementaryTypeName",
-                        "src": "1383:7:0"
+                        "src": "1510:7:0"
                       }
                     ],
-                    "id": 57,
+                    "id": 68,
                     "name": "VariableDeclaration",
-                    "src": "1383:12:0"
+                    "src": "1510:20:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 113,
+                      "scope": 152,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -4608,19 +5338,46 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 58,
+                        "id": 69,
                         "name": "ElementaryTypeName",
-                        "src": "1397:7:0"
+                        "src": "1532:7:0"
                       }
                     ],
-                    "id": 59,
+                    "id": 70,
                     "name": "VariableDeclaration",
-                    "src": "1397:15:0"
+                    "src": "1532:15:0"
+                  },
+                  {
+                    "attributes": {
+                      "constant": false,
+                      "name": "_feeTo",
+                      "scope": 152,
+                      "stateVariable": false,
+                      "storageLocation": "default",
+                      "type": "address",
+                      "value": null,
+                      "visibility": "internal"
+                    },
+                    "children": [
+                      {
+                        "attributes": {
+                          "name": "address",
+                          "stateMutability": "nonpayable",
+                          "type": "address"
+                        },
+                        "id": 71,
+                        "name": "ElementaryTypeName",
+                        "src": "1549:7:0"
+                      }
+                    ],
+                    "id": 72,
+                    "name": "VariableDeclaration",
+                    "src": "1549:14:0"
                   }
                 ],
-                "id": 60,
+                "id": 73,
                 "name": "ParameterList",
-                "src": "1328:85:0"
+                "src": "1455:109:0"
               },
               {
                 "attributes": {
@@ -4629,9 +5386,9 @@
                   ]
                 },
                 "children": [],
-                "id": 61,
+                "id": 74,
                 "name": "ParameterList",
-                "src": "1423:0:0"
+                "src": "1574:0:0"
               },
               {
                 "children": [
@@ -4665,16 +5422,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 62,
+                            "id": 75,
                             "name": "Identifier",
-                            "src": "1429:7:0"
+                            "src": "1580:7:0"
                           },
                           {
                             "attributes": {
@@ -4709,18 +5466,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3260,
+                                      "referencedDeclaration": 1068,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 63,
+                                    "id": 76,
                                     "name": "Identifier",
-                                    "src": "1437:3:0"
+                                    "src": "1588:3:0"
                                   }
                                 ],
-                                "id": 64,
+                                "id": 77,
                                 "name": "MemberAccess",
-                                "src": "1437:9:0"
+                                "src": "1588:9:0"
                               },
                               {
                                 "attributes": {
@@ -4728,18 +5485,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 59,
+                                  "referencedDeclaration": 70,
                                   "type": "uint256",
                                   "value": "_refund"
                                 },
-                                "id": 65,
+                                "id": 78,
                                 "name": "Identifier",
-                                "src": "1450:7:0"
+                                "src": "1601:7:0"
                               }
                             ],
-                            "id": 66,
+                            "id": 79,
                             "name": "BinaryOperation",
-                            "src": "1437:20:0"
+                            "src": "1588:20:0"
                           },
                           {
                             "attributes": {
@@ -4754,149 +5511,65 @@
                               "type": "literal_string \"Incorrect refund amount received by the contract\"",
                               "value": "Incorrect refund amount received by the contract"
                             },
-                            "id": 67,
+                            "id": 80,
                             "name": "Literal",
-                            "src": "1459:50:0"
+                            "src": "1610:50:0"
                           }
                         ],
-                        "id": 68,
+                        "id": 81,
                         "name": "FunctionCall",
-                        "src": "1429:81:0"
+                        "src": "1580:81:0"
                       }
                     ],
-                    "id": 69,
+                    "id": 82,
                     "name": "ExpressionStatement",
-                    "src": "1429:81:0"
-                  },
-                  {
-                    "children": [
-                      {
-                        "attributes": {
-                          "argumentTypes": null,
-                          "isConstant": false,
-                          "isLValue": false,
-                          "isPure": false,
-                          "isStructConstructorCall": false,
-                          "lValueRequested": false,
-                          "names": [
-                            null
-                          ],
-                          "type": "tuple()",
-                          "type_conversion": false
-                        },
-                        "children": [
-                          {
-                            "attributes": {
-                              "argumentTypes": [
-                                {
-                                  "typeIdentifier": "t_address_payable",
-                                  "typeString": "address payable"
-                                },
-                                {
-                                  "typeIdentifier": "t_uint256",
-                                  "typeString": "uint256"
-                                }
-                              ],
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 226,
-                              "type": "function (address,uint256)",
-                              "value": "_safeErc20Transfer"
-                            },
-                            "id": 70,
-                            "name": "Identifier",
-                            "src": "1517:18:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "overloadedDeclarations": [
-                                null
-                              ],
-                              "referencedDeclaration": 53,
-                              "type": "address payable",
-                              "value": "_recipient"
-                            },
-                            "id": 71,
-                            "name": "Identifier",
-                            "src": "1536:10:0"
-                          },
-                          {
-                            "attributes": {
-                              "argumentTypes": null,
-                              "commonType": {
-                                "typeIdentifier": "t_uint256",
-                                "typeString": "uint256"
-                              },
-                              "isConstant": false,
-                              "isLValue": false,
-                              "isPure": false,
-                              "lValueRequested": false,
-                              "operator": "-",
-                              "type": "uint256"
-                            },
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 897,
-                                  "type": "uint256",
-                                  "value": "denomination"
-                                },
-                                "id": 72,
-                                "name": "Identifier",
-                                "src": "1548:12:0"
-                              },
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "overloadedDeclarations": [
-                                    null
-                                  ],
-                                  "referencedDeclaration": 57,
-                                  "type": "uint256",
-                                  "value": "_fee"
-                                },
-                                "id": 73,
-                                "name": "Identifier",
-                                "src": "1563:4:0"
-                              }
-                            ],
-                            "id": 74,
-                            "name": "BinaryOperation",
-                            "src": "1548:19:0"
-                          }
-                        ],
-                        "id": 75,
-                        "name": "FunctionCall",
-                        "src": "1517:51:0"
-                      }
-                    ],
-                    "id": 76,
-                    "name": "ExpressionStatement",
-                    "src": "1517:51:0"
+                    "src": "1580:81:0"
                   },
                   {
                     "attributes": {
-                      "falseBody": null
+                      "assignments": [
+                        84
+                      ]
                     },
                     "children": [
+                      {
+                        "attributes": {
+                          "constant": false,
+                          "name": "feeOn",
+                          "scope": 151,
+                          "stateVariable": false,
+                          "storageLocation": "default",
+                          "type": "bool",
+                          "value": null,
+                          "visibility": "internal"
+                        },
+                        "children": [
+                          {
+                            "attributes": {
+                              "name": "bool",
+                              "type": "bool"
+                            },
+                            "id": 83,
+                            "name": "ElementaryTypeName",
+                            "src": "1668:4:0"
+                          }
+                        ],
+                        "id": 84,
+                        "name": "VariableDeclaration",
+                        "src": "1668:10:0"
+                      },
                       {
                         "attributes": {
                           "argumentTypes": null,
                           "commonType": {
-                            "typeIdentifier": "t_uint256",
-                            "typeString": "uint256"
+                            "typeIdentifier": "t_address",
+                            "typeString": "address"
                           },
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
-                          "operator": ">",
+                          "operator": "!=",
                           "type": "bool"
                         },
                         "children": [
@@ -4906,35 +5579,95 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 57,
-                              "type": "uint256",
-                              "value": "_fee"
+                              "referencedDeclaration": 72,
+                              "type": "address",
+                              "value": "_feeTo"
                             },
-                            "id": 77,
+                            "id": 85,
                             "name": "Identifier",
-                            "src": "1578:4:0"
+                            "src": "1681:6:0"
                           },
                           {
                             "attributes": {
                               "argumentTypes": null,
-                              "hexvalue": "30",
                               "isConstant": false,
                               "isLValue": false,
                               "isPure": true,
+                              "isStructConstructorCall": false,
                               "lValueRequested": false,
-                              "subdenomination": null,
-                              "token": "number",
-                              "type": "int_const 0",
-                              "value": "0"
+                              "names": [
+                                null
+                              ],
+                              "type": "address payable",
+                              "type_conversion": true
                             },
-                            "id": 78,
-                            "name": "Literal",
-                            "src": "1585:1:0"
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": [
+                                    {
+                                      "typeIdentifier": "t_rational_0_by_1",
+                                      "typeString": "int_const 0"
+                                    }
+                                  ],
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "type": "type(address)",
+                                  "value": "address"
+                                },
+                                "id": 86,
+                                "name": "ElementaryTypeNameExpression",
+                                "src": "1691:7:0"
+                              },
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "hexvalue": "30",
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": true,
+                                  "lValueRequested": false,
+                                  "subdenomination": null,
+                                  "token": "number",
+                                  "type": "int_const 0",
+                                  "value": "0"
+                                },
+                                "id": 87,
+                                "name": "Literal",
+                                "src": "1699:1:0"
+                              }
+                            ],
+                            "id": 88,
+                            "name": "FunctionCall",
+                            "src": "1691:10:0"
                           }
                         ],
-                        "id": 79,
+                        "id": 89,
                         "name": "BinaryOperation",
-                        "src": "1578:8:0"
+                        "src": "1681:20:0"
+                      }
+                    ],
+                    "id": 90,
+                    "name": "VariableDeclarationStatement",
+                    "src": "1668:33:0"
+                  },
+                  {
+                    "children": [
+                      {
+                        "attributes": {
+                          "argumentTypes": null,
+                          "overloadedDeclarations": [
+                            null
+                          ],
+                          "referencedDeclaration": 84,
+                          "type": "bool",
+                          "value": "feeOn"
+                        },
+                        "id": 91,
+                        "name": "Identifier",
+                        "src": "1711:5:0"
                       },
                       {
                         "children": [
@@ -4970,13 +5703,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 226,
+                                      "referencedDeclaration": 265,
                                       "type": "function (address,uint256)",
                                       "value": "_safeErc20Transfer"
                                     },
-                                    "id": 80,
+                                    "id": 92,
                                     "name": "Identifier",
-                                    "src": "1596:18:0"
+                                    "src": "1726:18:0"
                                   },
                                   {
                                     "attributes": {
@@ -4984,47 +5717,312 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 55,
+                                      "referencedDeclaration": 64,
                                       "type": "address payable",
-                                      "value": "_relayer"
+                                      "value": "_recipient"
                                     },
-                                    "id": 81,
+                                    "id": 93,
                                     "name": "Identifier",
-                                    "src": "1615:8:0"
+                                    "src": "1745:10:0"
                                   },
                                   {
                                     "attributes": {
                                       "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 57,
-                                      "type": "uint256",
-                                      "value": "_fee"
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
                                     },
-                                    "id": 82,
-                                    "name": "Identifier",
-                                    "src": "1625:4:0"
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "commonType": {
+                                            "typeIdentifier": "t_uint256",
+                                            "typeString": "uint256"
+                                          },
+                                          "isConstant": false,
+                                          "isLValue": false,
+                                          "isPure": false,
+                                          "lValueRequested": false,
+                                          "operator": "-",
+                                          "type": "uint256"
+                                        },
+                                        "children": [
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 713,
+                                              "type": "uint256",
+                                              "value": "denomination"
+                                            },
+                                            "id": 94,
+                                            "name": "Identifier",
+                                            "src": "1757:12:0"
+                                          },
+                                          {
+                                            "attributes": {
+                                              "argumentTypes": null,
+                                              "overloadedDeclarations": [
+                                                null
+                                              ],
+                                              "referencedDeclaration": 68,
+                                              "type": "uint256",
+                                              "value": "_relayer_fee"
+                                            },
+                                            "id": 95,
+                                            "name": "Identifier",
+                                            "src": "1772:12:0"
+                                          }
+                                        ],
+                                        "id": 96,
+                                        "name": "BinaryOperation",
+                                        "src": "1757:27:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 8,
+                                          "type": "uint256",
+                                          "value": "protocolFee"
+                                        },
+                                        "id": 97,
+                                        "name": "Identifier",
+                                        "src": "1787:11:0"
+                                      }
+                                    ],
+                                    "id": 98,
+                                    "name": "BinaryOperation",
+                                    "src": "1757:41:0"
                                   }
                                 ],
-                                "id": 83,
+                                "id": 99,
                                 "name": "FunctionCall",
-                                "src": "1596:34:0"
+                                "src": "1726:73:0"
                               }
                             ],
-                            "id": 84,
+                            "id": 100,
                             "name": "ExpressionStatement",
-                            "src": "1596:34:0"
+                            "src": "1726:73:0"
+                          },
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address",
+                                          "typeString": "address"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 101,
+                                    "name": "Identifier",
+                                    "src": "1807:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 72,
+                                      "type": "address",
+                                      "value": "_feeTo"
+                                    },
+                                    "id": 102,
+                                    "name": "Identifier",
+                                    "src": "1826:6:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 8,
+                                      "type": "uint256",
+                                      "value": "protocolFee"
+                                    },
+                                    "id": 103,
+                                    "name": "Identifier",
+                                    "src": "1834:11:0"
+                                  }
+                                ],
+                                "id": 104,
+                                "name": "FunctionCall",
+                                "src": "1807:39:0"
+                              }
+                            ],
+                            "id": 105,
+                            "name": "ExpressionStatement",
+                            "src": "1807:39:0"
                           }
                         ],
-                        "id": 85,
+                        "id": 106,
                         "name": "Block",
-                        "src": "1588:49:0"
+                        "src": "1718:135:0"
+                      },
+                      {
+                        "children": [
+                          {
+                            "children": [
+                              {
+                                "attributes": {
+                                  "argumentTypes": null,
+                                  "isConstant": false,
+                                  "isLValue": false,
+                                  "isPure": false,
+                                  "isStructConstructorCall": false,
+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
+                                    "id": 107,
+                                    "name": "Identifier",
+                                    "src": "1867:18:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 64,
+                                      "type": "address payable",
+                                      "value": "_recipient"
+                                    },
+                                    "id": 108,
+                                    "name": "Identifier",
+                                    "src": "1886:10:0"
+                                  },
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": null,
+                                      "commonType": {
+                                        "typeIdentifier": "t_uint256",
+                                        "typeString": "uint256"
+                                      },
+                                      "isConstant": false,
+                                      "isLValue": false,
+                                      "isPure": false,
+                                      "lValueRequested": false,
+                                      "operator": "-",
+                                      "type": "uint256"
+                                    },
+                                    "children": [
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 713,
+                                          "type": "uint256",
+                                          "value": "denomination"
+                                        },
+                                        "id": 109,
+                                        "name": "Identifier",
+                                        "src": "1898:12:0"
+                                      },
+                                      {
+                                        "attributes": {
+                                          "argumentTypes": null,
+                                          "overloadedDeclarations": [
+                                            null
+                                          ],
+                                          "referencedDeclaration": 68,
+                                          "type": "uint256",
+                                          "value": "_relayer_fee"
+                                        },
+                                        "id": 110,
+                                        "name": "Identifier",
+                                        "src": "1913:12:0"
+                                      }
+                                    ],
+                                    "id": 111,
+                                    "name": "BinaryOperation",
+                                    "src": "1898:27:0"
+                                  }
+                                ],
+                                "id": 112,
+                                "name": "FunctionCall",
+                                "src": "1867:59:0"
+                              }
+                            ],
+                            "id": 113,
+                            "name": "ExpressionStatement",
+                            "src": "1867:59:0"
+                          }
+                        ],
+                        "id": 114,
+                        "name": "Block",
+                        "src": "1859:74:0"
                       }
                     ],
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                   },
                   {
                     "attributes": {
@@ -5052,13 +6050,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 59,
+                              "referencedDeclaration": 68,
                               "type": "uint256",
-                              "value": "_refund"
+                              "value": "_relayer_fee"
                             },
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+                            "id": 116,
                             "name": "Identifier",
-                            "src": "1647:7:0"
+                            "src": "1943:12:0"
                           },
                           {
                             "attributes": {
@@ -5073,21 +6071,167 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 88,
+                            "id": 117,
                             "name": "Literal",
-                            "src": "1657:1:0"
+                            "src": "1958:1:0"
                           }
                         ],
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+                        "id": 118,
                         "name": "BinaryOperation",
-                        "src": "1647:11:0"
+                        "src": "1943:16:0"
+                      },
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+                          {
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+                                  "lValueRequested": false,
+                                  "names": [
+                                    null
+                                  ],
+                                  "type": "tuple()",
+                                  "type_conversion": false
+                                },
+                                "children": [
+                                  {
+                                    "attributes": {
+                                      "argumentTypes": [
+                                        {
+                                          "typeIdentifier": "t_address_payable",
+                                          "typeString": "address payable"
+                                        },
+                                        {
+                                          "typeIdentifier": "t_uint256",
+                                          "typeString": "uint256"
+                                        }
+                                      ],
+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 265,
+                                      "type": "function (address,uint256)",
+                                      "value": "_safeErc20Transfer"
+                                    },
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+                                    "name": "Identifier",
+                                    "src": "1969:18:0"
+                                  },
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+                                      "overloadedDeclarations": [
+                                        null
+                                      ],
+                                      "referencedDeclaration": 66,
+                                      "type": "address payable",
+                                      "value": "_relayer"
+                                    },
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+                                    "name": "Identifier",
+                                    "src": "1988:8:0"
+                                  },
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+                                        null
+                                      ],
+                                      "referencedDeclaration": 68,
+                                      "type": "uint256",
+                                      "value": "_relayer_fee"
+                                    },
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+                                    "name": "Identifier",
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+                                  }
+                                ],
+                                "id": 122,
+                                "name": "FunctionCall",
+                                "src": "1969:42:0"
+                              }
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+                            "name": "ExpressionStatement",
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+                          "commonType": {
+                            "typeIdentifier": "t_uint256",
+                            "typeString": "uint256"
+                          },
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+                          "isLValue": false,
+                          "isPure": false,
+                          "lValueRequested": false,
+                          "operator": ">",
+                          "type": "bool"
+                        },
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+                              "overloadedDeclarations": [
+                                null
+                              ],
+                              "referencedDeclaration": 70,
+                              "type": "uint256",
+                              "value": "_refund"
+                            },
+                            "id": 126,
+                            "name": "Identifier",
+                            "src": "2028:7:0"
+                          },
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+                              "hexvalue": "30",
+                              "isConstant": false,
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+                              "lValueRequested": false,
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+                              "token": "number",
+                              "type": "int_const 0",
+                              "value": "0"
+                            },
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+                            "name": "Literal",
+                            "src": "2038:1:0"
+                          }
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+                        "name": "BinaryOperation",
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                       },
                       {
                         "children": [
                           {
                             "attributes": {
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@@ -5096,7 +6240,7 @@
                                 "attributes": {
                                   "constant": false,
                                   "name": "success",
-                                  "scope": 110,
+                                  "scope": 149,
                                   "stateVariable": false,
                                   "storageLocation": "default",
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@@ -5109,14 +6253,14 @@
                                       "name": "bool",
                                       "type": "bool"
                                     },
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+                                    "id": 129,
                                     "name": "ElementaryTypeName",
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                                 "name": "VariableDeclaration",
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@@ -5188,23 +6332,23 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 53,
+                                                  "referencedDeclaration": 64,
                                                   "type": "address payable",
                                                   "value": "_recipient"
                                                 },
-                                                "id": 92,
+                                                "id": 131,
                                                 "name": "Identifier",
-                                                "src": "1687:10:0"
+                                                "src": "2068:10:0"
                                               }
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+                                            "id": 132,
                                             "name": "MemberAccess",
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                                         "name": "MemberAccess",
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@@ -5212,18 +6356,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
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                                           "type": "uint256",
                                           "value": "_refund"
                                         },
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                                         "name": "Identifier",
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@@ -5238,19 +6382,19 @@
                                       "type": "literal_string \"\"",
                                       "value": ""
                                     },
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                                     "name": "Literal",
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+                                    "src": "2099:2:0"
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                                 "name": "FunctionCall",
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                             "name": "VariableDeclarationStatement",
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@@ -5275,18 +6419,18 @@
                                       "overloadedDeclarations": [
                                         null
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                                       "type": "bool",
                                       "value": "success"
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                                     "name": "Identifier",
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                                 "name": "UnaryOperation",
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@@ -5330,18 +6474,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
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+                                                  "referencedDeclaration": 66,
                                                   "type": "address payable",
                                                   "value": "_relayer"
                                                 },
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+                                                "id": 141,
                                                 "name": "Identifier",
-                                                "src": "1805:8:0"
+                                                "src": "2186:8:0"
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+                                            "id": 143,
                                             "name": "MemberAccess",
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@@ -5349,53 +6493,53 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 59,
+                                              "referencedDeclaration": 70,
                                               "type": "uint256",
                                               "value": "_refund"
                                             },
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                                             "name": "Identifier",
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+                                            "src": "2204:7:0"
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                                 "name": "Block",
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                             ],
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                             "name": "IfStatement",
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+                            "src": "2110:111:0"
                           }
                         ],
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                         "name": "Block",
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                 ],
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           {
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@@ -5407,7 +6551,7 @@
                 null
               ],
               "name": "_safeErc20TransferFrom",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
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               "visibility": "internal"
@@ -5419,7 +6563,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_from",
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5433,20 +6577,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 114,
+                        "id": 153,
                         "name": "ElementaryTypeName",
-                        "src": "1886:7:0"
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                     ],
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-                    "src": "1886:13:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_to",
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                       "stateVariable": false,
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                       "type": "address",
@@ -5460,20 +6604,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 116,
+                        "id": 155,
                         "name": "ElementaryTypeName",
-                        "src": "1901:7:0"
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                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 171,
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                       "stateVariable": false,
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                       "type": "uint256",
@@ -5486,19 +6630,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 118,
+                        "id": 157,
                         "name": "ElementaryTypeName",
-                        "src": "1914:7:0"
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@@ -5507,17 +6651,17 @@
                   ]
                 },
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                 "name": "ParameterList",
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               {
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                   {
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-                        123,
-                        125
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@@ -5525,7 +6669,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 170,
+                          "scope": 209,
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                           "storageLocation": "default",
                           "type": "bool",
@@ -5538,20 +6682,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 122,
+                            "id": 161,
                             "name": "ElementaryTypeName",
-                            "src": "1947:4:0"
+                            "src": "2328:4:0"
                           }
                         ],
-                        "id": 123,
+                        "id": 162,
                         "name": "VariableDeclaration",
-                        "src": "1947:12:0"
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                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 170,
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                           "stateVariable": false,
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                           "type": "bytes",
@@ -5564,14 +6708,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 124,
+                            "id": 163,
                             "name": "ElementaryTypeName",
-                            "src": "1961:5:0"
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                         ],
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                         "name": "VariableDeclaration",
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                         "attributes": {
@@ -5615,14 +6759,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 126,
+                                "id": 165,
                                 "name": "Identifier",
-                                "src": "1982:5:0"
+                                "src": "2363:5:0"
                               }
                             ],
-                            "id": 127,
+                            "id": 166,
                             "name": "MemberAccess",
-                            "src": "1982:10:0"
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                           {
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@@ -5674,18 +6818,18 @@
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-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1055,
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                                       "value": "abi"
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                                     "name": "Identifier",
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                                 "name": "MemberAccess",
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@@ -5700,9 +6844,9 @@
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                                   "value": "0x23b872dd"
                                 },
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                                 "name": "Literal",
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@@ -5710,13 +6854,13 @@
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-                                  "referencedDeclaration": 115,
+                                  "referencedDeclaration": 154,
                                   "type": "address",
                                   "value": "_from"
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+                                "id": 170,
                                 "name": "Identifier",
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@@ -5724,13 +6868,13 @@
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                                 "name": "Identifier",
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@@ -5738,28 +6882,28 @@
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+                                  "referencedDeclaration": 158,
                                   "type": "uint256",
                                   "value": "_amount"
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                                 "name": "Identifier",
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@@ -5791,16 +6935,16 @@
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                               "value": "require"
                             },
-                            "id": 137,
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                             "name": "Identifier",
-                            "src": "2074:7:0"
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@@ -5808,13 +6952,13 @@
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@@ -5829,19 +6973,19 @@
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@@ -5881,18 +7025,18 @@
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                             "name": "MemberAccess",
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@@ -5907,14 +7051,14 @@
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@@ -5948,16 +7092,16 @@
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+                                        1072
                                       ],
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+                                      "referencedDeclaration": 1072,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 146,
+                                    "id": 185,
                                     "name": "Identifier",
-                                    "src": "2244:7:0"
+                                    "src": "2625:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -5992,18 +7136,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 125,
+                                              "referencedDeclaration": 164,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 147,
+                                            "id": 186,
                                             "name": "Identifier",
-                                            "src": "2252:4:0"
+                                            "src": "2633:4:0"
                                           }
                                         ],
-                                        "id": 148,
+                                        "id": 187,
                                         "name": "MemberAccess",
-                                        "src": "2252:11:0"
+                                        "src": "2633:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6018,14 +7162,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 149,
+                                        "id": 188,
                                         "name": "Literal",
-                                        "src": "2267:2:0"
+                                        "src": "2648:2:0"
                                       }
                                     ],
-                                    "id": 150,
+                                    "id": 189,
                                     "name": "BinaryOperation",
-                                    "src": "2252:17:0"
+                                    "src": "2633:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6040,19 +7184,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 151,
+                                    "id": 190,
                                     "name": "Literal",
-                                    "src": "2271:44:0"
+                                    "src": "2652:44:0"
                                   }
                                 ],
-                                "id": 152,
+                                "id": 191,
                                 "name": "FunctionCall",
-                                "src": "2244:72:0"
+                                "src": "2625:72:0"
                               }
                             ],
-                            "id": 153,
+                            "id": 192,
                             "name": "ExpressionStatement",
-                            "src": "2244:72:0"
+                            "src": "2625:72:0"
                           },
                           {
                             "children": [
@@ -6073,13 +7217,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 154,
+                                    "id": 193,
                                     "name": "Identifier",
-                                    "src": "2324:7:0"
+                                    "src": "2705:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6123,18 +7267,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1055,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 155,
+                                            "id": 194,
                                             "name": "Identifier",
-                                            "src": "2334:3:0"
+                                            "src": "2715:3:0"
                                           }
                                         ],
-                                        "id": 156,
+                                        "id": 195,
                                         "name": "MemberAccess",
-                                        "src": "2334:10:0"
+                                        "src": "2715:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6142,13 +7286,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 125,
+                                          "referencedDeclaration": 164,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 157,
+                                        "id": 196,
                                         "name": "Identifier",
-                                        "src": "2345:4:0"
+                                        "src": "2726:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -6171,29 +7315,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 158,
+                                            "id": 197,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2352:4:0"
+                                            "src": "2733:4:0"
                                           }
                                         ],
-                                        "id": 159,
+                                        "id": 198,
                                         "name": "TupleExpression",
-                                        "src": "2351:6:0"
+                                        "src": "2732:6:0"
                                       }
                                     ],
-                                    "id": 160,
+                                    "id": 199,
                                     "name": "FunctionCall",
-                                    "src": "2334:24:0"
+                                    "src": "2715:24:0"
                                   }
                                 ],
-                                "id": 161,
+                                "id": 200,
                                 "name": "Assignment",
-                                "src": "2324:34:0"
+                                "src": "2705:34:0"
                               }
                             ],
-                            "id": 162,
+                            "id": 201,
                             "name": "ExpressionStatement",
-                            "src": "2324:34:0"
+                            "src": "2705:34:0"
                           },
                           {
                             "children": [
@@ -6225,16 +7369,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1071,
+                                        1072
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1072,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 163,
+                                    "id": 202,
                                     "name": "Identifier",
-                                    "src": "2366:7:0"
+                                    "src": "2747:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6242,13 +7386,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 123,
+                                      "referencedDeclaration": 162,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 164,
+                                    "id": 203,
                                     "name": "Identifier",
-                                    "src": "2374:7:0"
+                                    "src": "2755:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6263,39 +7407,39 @@
                                       "type": "literal_string \"not enough allowed tokens. Token returns false.\"",
                                       "value": "not enough allowed tokens. Token returns false."
                                     },
-                                    "id": 165,
+                                    "id": 204,
                                     "name": "Literal",
-                                    "src": "2383:49:0"
+                                    "src": "2764:49:0"
                                   }
                                 ],
-                                "id": 166,
+                                "id": 205,
                                 "name": "FunctionCall",
-                                "src": "2366:67:0"
+                                "src": "2747:67:0"
                               }
                             ],
-                            "id": 167,
+                            "id": 206,
                             "name": "ExpressionStatement",
-                            "src": "2366:67:0"
+                            "src": "2747:67:0"
                           }
                         ],
-                        "id": 168,
+                        "id": 207,
                         "name": "Block",
-                        "src": "2236:204:0"
+                        "src": "2617:204:0"
                       }
                     ],
-                    "id": 169,
+                    "id": 208,
                     "name": "IfStatement",
-                    "src": "2215:225:0"
+                    "src": "2596:225:0"
                   }
                 ],
-                "id": 170,
+                "id": 209,
                 "name": "Block",
-                "src": "1940:504:0"
+                "src": "2321:504:0"
               }
             ],
-            "id": 171,
+            "id": 210,
             "name": "FunctionDefinition",
-            "src": "1854:590:0"
+            "src": "2235:590:0"
           },
           {
             "attributes": {
@@ -6307,7 +7451,7 @@
                 null
               ],
               "name": "_safeErc20Transfer",
-              "scope": 227,
+              "scope": 266,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6319,7 +7463,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_to",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -6333,20 +7477,20 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 172,
+                        "id": 211,
                         "name": "ElementaryTypeName",
-                        "src": "2476:7:0"
+                        "src": "2857:7:0"
                       }
                     ],
-                    "id": 173,
+                    "id": 212,
                     "name": "VariableDeclaration",
-                    "src": "2476:11:0"
+                    "src": "2857:11:0"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_amount",
-                      "scope": 226,
+                      "scope": 265,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6359,19 +7503,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 174,
+                        "id": 213,
                         "name": "ElementaryTypeName",
-                        "src": "2489:7:0"
+                        "src": "2870:7:0"
                       }
                     ],
-                    "id": 175,
+                    "id": 214,
                     "name": "VariableDeclaration",
-                    "src": "2489:15:0"
+                    "src": "2870:15:0"
                   }
                 ],
-                "id": 176,
+                "id": 215,
                 "name": "ParameterList",
-                "src": "2475:30:0"
+                "src": "2856:30:0"
               },
               {
                 "attributes": {
@@ -6380,17 +7524,17 @@
                   ]
                 },
                 "children": [],
-                "id": 177,
+                "id": 216,
                 "name": "ParameterList",
-                "src": "2515:0:0"
+                "src": "2896:0:0"
               },
               {
                 "children": [
                   {
                     "attributes": {
                       "assignments": [
-                        179,
-                        181
+                        218,
+                        220
                       ]
                     },
                     "children": [
@@ -6398,7 +7542,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "success",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "bool",
@@ -6411,20 +7555,20 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 178,
+                            "id": 217,
                             "name": "ElementaryTypeName",
-                            "src": "2522:4:0"
+                            "src": "2903:4:0"
                           }
                         ],
-                        "id": 179,
+                        "id": 218,
                         "name": "VariableDeclaration",
-                        "src": "2522:12:0"
+                        "src": "2903:12:0"
                       },
                       {
                         "attributes": {
                           "constant": false,
                           "name": "data",
-                          "scope": 225,
+                          "scope": 264,
                           "stateVariable": false,
                           "storageLocation": "memory",
                           "type": "bytes",
@@ -6437,14 +7581,14 @@
                               "name": "bytes",
                               "type": "bytes"
                             },
-                            "id": 180,
+                            "id": 219,
                             "name": "ElementaryTypeName",
-                            "src": "2536:5:0"
+                            "src": "2917:5:0"
                           }
                         ],
-                        "id": 181,
+                        "id": 220,
                         "name": "VariableDeclaration",
-                        "src": "2536:17:0"
+                        "src": "2917:17:0"
                       },
                       {
                         "attributes": {
@@ -6488,14 +7632,14 @@
                                   "type": "address",
                                   "value": "token"
                                 },
-                                "id": 182,
+                                "id": 221,
                                 "name": "Identifier",
-                                "src": "2557:5:0"
+                                "src": "2938:5:0"
                               }
                             ],
-                            "id": 183,
+                            "id": 222,
                             "name": "MemberAccess",
-                            "src": "2557:10:0"
+                            "src": "2938:10:0"
                           },
                           {
                             "attributes": {
@@ -6543,18 +7687,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 3247,
+                                      "referencedDeclaration": 1055,
                                       "type": "abi",
                                       "value": "abi"
                                     },
-                                    "id": 184,
+                                    "id": 223,
                                     "name": "Identifier",
-                                    "src": "2568:3:0"
+                                    "src": "2949:3:0"
                                   }
                                 ],
-                                "id": 185,
+                                "id": 224,
                                 "name": "MemberAccess",
-                                "src": "2568:22:0"
+                                "src": "2949:22:0"
                               },
                               {
                                 "attributes": {
@@ -6569,9 +7713,9 @@
                                   "type": "int_const 2835717307",
                                   "value": "0xa9059cbb"
                                 },
-                                "id": 186,
+                                "id": 225,
                                 "name": "Literal",
-                                "src": "2591:10:0"
+                                "src": "2972:10:0"
                               },
                               {
                                 "attributes": {
@@ -6579,13 +7723,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 173,
+                                  "referencedDeclaration": 212,
                                   "type": "address",
                                   "value": "_to"
                                 },
-                                "id": 187,
+                                "id": 226,
                                 "name": "Identifier",
-                                "src": "2618:3:0"
+                                "src": "2999:3:0"
                               },
                               {
                                 "attributes": {
@@ -6593,28 +7737,28 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 175,
+                                  "referencedDeclaration": 214,
                                   "type": "uint256",
                                   "value": "_amount"
                                 },
-                                "id": 188,
+                                "id": 227,
                                 "name": "Identifier",
-                                "src": "2623:7:0"
+                                "src": "3004:7:0"
                               }
                             ],
-                            "id": 189,
+                            "id": 228,
                             "name": "FunctionCall",
-                            "src": "2568:63:0"
+                            "src": "2949:63:0"
                           }
                         ],
-                        "id": 190,
+                        "id": 229,
                         "name": "FunctionCall",
-                        "src": "2557:75:0"
+                        "src": "2938:75:0"
                       }
                     ],
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                     "name": "VariableDeclarationStatement",
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+                    "src": "2902:111:0"
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                   {
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@@ -6646,16 +7790,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                3263,
-                                3264
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 3264,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 192,
+                            "id": 231,
                             "name": "Identifier",
-                            "src": "2638:7:0"
+                            "src": "3019:7:0"
                           },
                           {
                             "attributes": {
@@ -6663,13 +7807,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 179,
+                              "referencedDeclaration": 218,
                               "type": "bool",
                               "value": "success"
                             },
-                            "id": 193,
+                            "id": 232,
                             "name": "Identifier",
-                            "src": "2646:7:0"
+                            "src": "3027:7:0"
                           },
                           {
                             "attributes": {
@@ -6684,19 +7828,19 @@
                               "type": "literal_string \"not enough tokens\"",
                               "value": "not enough tokens"
                             },
-                            "id": 194,
+                            "id": 233,
                             "name": "Literal",
-                            "src": "2655:19:0"
+                            "src": "3036:19:0"
                           }
                         ],
-                        "id": 195,
+                        "id": 234,
                         "name": "FunctionCall",
-                        "src": "2638:37:0"
+                        "src": "3019:37:0"
                       }
                     ],
-                    "id": 196,
+                    "id": 235,
                     "name": "ExpressionStatement",
-                    "src": "2638:37:0"
+                    "src": "3019:37:0"
                   },
                   {
                     "attributes": {
@@ -6736,18 +7880,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 181,
+                                  "referencedDeclaration": 220,
                                   "type": "bytes memory",
                                   "value": "data"
                                 },
-                                "id": 197,
+                                "id": 236,
                                 "name": "Identifier",
-                                "src": "2775:4:0"
+                                "src": "3156:4:0"
                               }
                             ],
-                            "id": 198,
+                            "id": 237,
                             "name": "MemberAccess",
-                            "src": "2775:11:0"
+                            "src": "3156:11:0"
                           },
                           {
                             "attributes": {
@@ -6762,14 +7906,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 199,
+                            "id": 238,
                             "name": "Literal",
-                            "src": "2789:1:0"
+                            "src": "3170:1:0"
                           }
                         ],
-                        "id": 200,
+                        "id": 239,
                         "name": "BinaryOperation",
-                        "src": "2775:15:0"
+                        "src": "3156:15:0"
                       },
                       {
                         "children": [
@@ -6803,16 +7947,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1071,
+                                        1072
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1072,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 201,
+                                    "id": 240,
                                     "name": "Identifier",
-                                    "src": "2800:7:0"
+                                    "src": "3181:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6847,18 +7991,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 181,
+                                              "referencedDeclaration": 220,
                                               "type": "bytes memory",
                                               "value": "data"
                                             },
-                                            "id": 202,
+                                            "id": 241,
                                             "name": "Identifier",
-                                            "src": "2808:4:0"
+                                            "src": "3189:4:0"
                                           }
                                         ],
-                                        "id": 203,
+                                        "id": 242,
                                         "name": "MemberAccess",
-                                        "src": "2808:11:0"
+                                        "src": "3189:11:0"
                                       },
                                       {
                                         "attributes": {
@@ -6873,14 +8017,14 @@
                                           "type": "int_const 32",
                                           "value": "32"
                                         },
-                                        "id": 204,
+                                        "id": 243,
                                         "name": "Literal",
-                                        "src": "2823:2:0"
+                                        "src": "3204:2:0"
                                       }
                                     ],
-                                    "id": 205,
+                                    "id": 244,
                                     "name": "BinaryOperation",
-                                    "src": "2808:17:0"
+                                    "src": "3189:17:0"
                                   },
                                   {
                                     "attributes": {
@@ -6895,19 +8039,19 @@
                                       "type": "literal_string \"data length should be either 0 or 32 bytes\"",
                                       "value": "data length should be either 0 or 32 bytes"
                                     },
-                                    "id": 206,
+                                    "id": 245,
                                     "name": "Literal",
-                                    "src": "2827:44:0"
+                                    "src": "3208:44:0"
                                   }
                                 ],
-                                "id": 207,
+                                "id": 246,
                                 "name": "FunctionCall",
-                                "src": "2800:72:0"
+                                "src": "3181:72:0"
                               }
                             ],
-                            "id": 208,
+                            "id": 247,
                             "name": "ExpressionStatement",
-                            "src": "2800:72:0"
+                            "src": "3181:72:0"
                           },
                           {
                             "children": [
@@ -6928,13 +8072,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 209,
+                                    "id": 248,
                                     "name": "Identifier",
-                                    "src": "2880:7:0"
+                                    "src": "3261:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -6978,18 +8122,18 @@
                                               "overloadedDeclarations": [
                                                 null
                                               ],
-                                              "referencedDeclaration": 3247,
+                                              "referencedDeclaration": 1055,
                                               "type": "abi",
                                               "value": "abi"
                                             },
-                                            "id": 210,
+                                            "id": 249,
                                             "name": "Identifier",
-                                            "src": "2890:3:0"
+                                            "src": "3271:3:0"
                                           }
                                         ],
-                                        "id": 211,
+                                        "id": 250,
                                         "name": "MemberAccess",
-                                        "src": "2890:10:0"
+                                        "src": "3271:10:0"
                                       },
                                       {
                                         "attributes": {
@@ -6997,13 +8141,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 181,
+                                          "referencedDeclaration": 220,
                                           "type": "bytes memory",
                                           "value": "data"
                                         },
-                                        "id": 212,
+                                        "id": 251,
                                         "name": "Identifier",
-                                        "src": "2901:4:0"
+                                        "src": "3282:4:0"
                                       },
                                       {
                                         "attributes": {
@@ -7026,29 +8170,29 @@
                                               "type": "type(bool)",
                                               "value": "bool"
                                             },
-                                            "id": 213,
+                                            "id": 252,
                                             "name": "ElementaryTypeNameExpression",
-                                            "src": "2908:4:0"
+                                            "src": "3289:4:0"
                                           }
                                         ],
-                                        "id": 214,
+                                        "id": 253,
                                         "name": "TupleExpression",
-                                        "src": "2907:6:0"
+                                        "src": "3288:6:0"
                                       }
                                     ],
-                                    "id": 215,
+                                    "id": 254,
                                     "name": "FunctionCall",
-                                    "src": "2890:24:0"
+                                    "src": "3271:24:0"
                                   }
                                 ],
-                                "id": 216,
+                                "id": 255,
                                 "name": "Assignment",
-                                "src": "2880:34:0"
+                                "src": "3261:34:0"
                               }
                             ],
-                            "id": 217,
+                            "id": 256,
                             "name": "ExpressionStatement",
-                            "src": "2880:34:0"
+                            "src": "3261:34:0"
                           },
                           {
                             "children": [
@@ -7080,16 +8224,16 @@
                                         }
                                       ],
                                       "overloadedDeclarations": [
-                                        3263,
-                                        3264
+                                        1071,
+                                        1072
                                       ],
-                                      "referencedDeclaration": 3264,
+                                      "referencedDeclaration": 1072,
                                       "type": "function (bool,string memory) pure",
                                       "value": "require"
                                     },
-                                    "id": 218,
+                                    "id": 257,
                                     "name": "Identifier",
-                                    "src": "2922:7:0"
+                                    "src": "3303:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7097,13 +8241,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 179,
+                                      "referencedDeclaration": 218,
                                       "type": "bool",
                                       "value": "success"
                                     },
-                                    "id": 219,
+                                    "id": 258,
                                     "name": "Identifier",
-                                    "src": "2930:7:0"
+                                    "src": "3311:7:0"
                                   },
                                   {
                                     "attributes": {
@@ -7118,49 +8262,49 @@
                                       "type": "literal_string \"not enough tokens. Token returns false.\"",
                                       "value": "not enough tokens. Token returns false."
                                     },
-                                    "id": 220,
+                                    "id": 259,
                                     "name": "Literal",
-                                    "src": "2939:41:0"
+                                    "src": "3320:41:0"
                                   }
                                 ],
-                                "id": 221,
+                                "id": 260,
                                 "name": "FunctionCall",
-                                "src": "2922:59:0"
+                                "src": "3303:59:0"
                               }
                             ],
-                            "id": 222,
+                            "id": 261,
                             "name": "ExpressionStatement",
-                            "src": "2922:59:0"
+                            "src": "3303:59:0"
                           }
                         ],
-                        "id": 223,
+                        "id": 262,
                         "name": "Block",
-                        "src": "2792:196:0"
+                        "src": "3173:196:0"
                       }
                     ],
-                    "id": 224,
+                    "id": 263,
                     "name": "IfStatement",
-                    "src": "2771:217:0"
+                    "src": "3152:217:0"
                   }
                 ],
-                "id": 225,
+                "id": 264,
                 "name": "Block",
-                "src": "2515:477:0"
+                "src": "2896:477:0"
               }
             ],
-            "id": 226,
+            "id": 265,
             "name": "FunctionDefinition",
-            "src": "2448:544:0"
+            "src": "2829:544:0"
           }
         ],
-        "id": 227,
+        "id": 266,
         "name": "ContractDefinition",
-        "src": "805:2189:0"
+        "src": "805:2570:0"
       }
     ],
-    "id": 228,
+    "id": 267,
     "name": "SourceUnit",
-    "src": "755:2240:0"
+    "src": "755:2621:0"
   },
   "compiler": {
     "name": "solc",
@@ -7170,14 +8314,14 @@
     "42220": {
       "events": {},
       "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
+        "Hasher": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE"
       },
-      "address": "0x8A281116D0EFCc36cd038AbD4f7b117489D62AA7",
-      "transactionHash": "0x610b669c6d27b8033b966558fbc9662743eebbf5a9702779efd47ced680fc677"
+      "address": "0xB6b10B5f276AF5c0eE5dC46e4083c3DE3bF017c7",
+      "transactionHash": "0x16171dd7781eb5dcdd099b447591ee863059ed6c034770e4bf2377201a1b9d94"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:51:06.230Z",
+  "updatedAt": "2021-04-02T22:52:25.952Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {
diff --git a/client/contracts/CELOTornado.3.json b/client/contracts/CELOTornado.3.json
deleted file mode 100644
index 6af1f4a..0000000
--- a/client/contracts/CELOTornado.3.json
+++ /dev/null
@@ -1,7219 +0,0 @@
-{
-  "contractName": "ERC20Tornado",
-  "abi": [
-    {
-      "inputs": [
-        {
-          "internalType": "contract IVerifier",
-          "name": "_verifier",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_denomination",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint32",
-          "name": "_merkleTreeHeight",
-          "type": "uint32"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_token",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "bytes32",
-          "name": "commitment",
-          "type": "bytes32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint32",
-          "name": "leafIndex",
-          "type": "uint32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "Deposit",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bytes32",
-          "name": "nullifierHash",
-          "type": "bytes32"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "relayer",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "fee",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "FIELD_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ROOT_HISTORY_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ZERO_VALUE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_newOperator",
-          "type": "address"
-        }
-      ],
-      "name": "changeOperator",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "commitments",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "currentRootIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "denomination",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_commitment",
-          "type": "bytes32"
-        }
-      ],
-      "name": "deposit",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "filledSubtrees",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getLastRoot",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_left",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_right",
-          "type": "bytes32"
-        }
-      ],
-      "name": "hashLeftRight",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_root",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isKnownRoot",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_nullifierHash",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isSpent",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32[]",
-          "name": "_nullifierHashes",
-          "type": "bytes32[]"
-        }
-      ],
-      "name": "isSpentArray",
-      "outputs": [
-        {
-          "internalType": "bool[]",
-          "name": "spent",
-          "type": "bool[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "levels",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "nextIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "nullifierHashes",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "operator",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "roots",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "token",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_newVerifier",
-          "type": "address"
-        }
-      ],
-      "name": "updateVerifier",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "verifier",
-      "outputs": [
-        {
-          "internalType": "contract IVerifier",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "bytes",
-          "name": "_proof",
-          "type": "bytes"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_root",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_nullifierHash",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "address payable",
-          "name": "_recipient",
-          "type": "address"
-        },
-        {
-          "internalType": "address payable",
-          "name": "_relayer",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_fee",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_refund",
-          "type": "uint256"
-        }
-      ],
-      "name": "withdraw",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "zeros",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    }
-  ],
-  "metadata": "{\"compiler\":{\"version\":\"0.5.17+commit.d19bba13\"},\"language\":\"Solidity\",\"output\":{\"abi\":[{\"inputs\":[{\"internalType\":\"contract IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"nullifierHashes\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"operator\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"roots\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"token\",\"outputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newVerifier\",\"type\":\"address\"}],\"name\":\"updateVerifier\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"verifier\",\"outputs\":[{\"internalType\":\"contract 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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
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-                                          "isPure": true,
-                                          "lValueRequested": false,
-                                          "subdenomination": null,
-                                          "token": "number",
-                                          "type": "int_const 32",
-                                          "value": "32"
-                                        },
-                                        "id": 204,
-                                        "name": "Literal",
-                                        "src": "2823:2:0"
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-                                      "type": "literal_string \"data length should be either 0 or 32 bytes\"",
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-                                            "id": 213,
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-                              }
-                            ],
-                            "id": 217,
-                            "name": "ExpressionStatement",
-                            "src": "2880:34:0"
-                          },
-                          {
-                            "children": [
-                              {
-                                "attributes": {
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-                                    "attributes": {
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-                                        {
-                                          "typeIdentifier": "t_stringliteral_38fa5aabf87e9f42de902eb4d9022484dde7943d80702b79ba468e9fc08f5e5e",
-                                          "typeString": "literal_string \"not enough tokens. Token returns false.\""
-                                        }
-                                      ],
-                                      "overloadedDeclarations": [
-                                        3263,
-                                        3264
-                                      ],
-                                      "referencedDeclaration": 3264,
-                                      "type": "function (bool,string memory) pure",
-                                      "value": "require"
-                                    },
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-                                    "name": "Identifier",
-                                    "src": "2922:7:0"
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-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 179,
-                                      "type": "bool",
-                                      "value": "success"
-                                    },
-                                    "id": 219,
-                                    "name": "Identifier",
-                                    "src": "2930:7:0"
-                                  },
-                                  {
-                                    "attributes": {
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-                                      "hexvalue": "6e6f7420656e6f75676820746f6b656e732e20546f6b656e2072657475726e732066616c73652e",
-                                      "isConstant": false,
-                                      "isLValue": false,
-                                      "isPure": true,
-                                      "lValueRequested": false,
-                                      "subdenomination": null,
-                                      "token": "string",
-                                      "type": "literal_string \"not enough tokens. Token returns false.\"",
-                                      "value": "not enough tokens. Token returns false."
-                                    },
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-                                    "src": "2939:41:0"
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-                            "name": "ExpressionStatement",
-                            "src": "2922:59:0"
-                          }
-                        ],
-                        "id": 223,
-                        "name": "Block",
-                        "src": "2792:196:0"
-                      }
-                    ],
-                    "id": 224,
-                    "name": "IfStatement",
-                    "src": "2771:217:0"
-                  }
-                ],
-                "id": 225,
-                "name": "Block",
-                "src": "2515:477:0"
-              }
-            ],
-            "id": 226,
-            "name": "FunctionDefinition",
-            "src": "2448:544:0"
-          }
-        ],
-        "id": 227,
-        "name": "ContractDefinition",
-        "src": "805:2189:0"
-      }
-    ],
-    "id": 228,
-    "name": "SourceUnit",
-    "src": "755:2240:0"
-  },
-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "networks": {
-    "42220": {
-      "events": {},
-      "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
-      },
-      "address": "0x40DDBB4C0a0d3BD0835CA510cC941549cE2B7485",
-      "transactionHash": "0xb38b7b057d4e4c9576c8c4bd13856b870b2bc89d51b12464c0576f7888bc44d2"
-    }
-  },
-  "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:50:16.065Z",
-  "networkType": "ethereum",
-  "devdoc": {
-    "methods": {
-      "changeOperator(address)": {
-        "details": "operator can change his address "
-      },
-      "deposit(bytes32)": {
-        "details": "Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.",
-        "params": {
-          "_commitment": "the note commitment, which is PedersenHash(nullifier + secret)"
-        }
-      },
-      "getLastRoot()": {
-        "details": "Returns the last root"
-      },
-      "hashLeftRight(bytes32,bytes32)": {
-        "details": "Hash 2 tree leaves, returns MiMC(_left, _right)"
-      },
-      "isKnownRoot(bytes32)": {
-        "details": "Whether the root is present in the root history"
-      },
-      "isSpent(bytes32)": {
-        "details": "whether a note is already spent "
-      },
-      "isSpentArray(bytes32[])": {
-        "details": "whether an array of notes is already spent "
-      },
-      "updateVerifier(address)": {
-        "details": "allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address"
-      },
-      "withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)": {
-        "details": "Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)"
-      }
-    }
-  },
-  "userdoc": {
-    "methods": {}
-  }
-}
\ No newline at end of file
diff --git a/client/contracts/CELOTornado.4.json b/client/contracts/CELOTornado.4.json
deleted file mode 100644
index 34572e9..0000000
--- a/client/contracts/CELOTornado.4.json
+++ /dev/null
@@ -1,7219 +0,0 @@
-{
-  "contractName": "ERC20Tornado",
-  "abi": [
-    {
-      "inputs": [
-        {
-          "internalType": "contract IVerifier",
-          "name": "_verifier",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_denomination",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint32",
-          "name": "_merkleTreeHeight",
-          "type": "uint32"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_token",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "bytes32",
-          "name": "commitment",
-          "type": "bytes32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint32",
-          "name": "leafIndex",
-          "type": "uint32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "Deposit",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bytes32",
-          "name": "nullifierHash",
-          "type": "bytes32"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "relayer",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "fee",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "FIELD_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ROOT_HISTORY_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ZERO_VALUE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_newOperator",
-          "type": "address"
-        }
-      ],
-      "name": "changeOperator",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "commitments",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "currentRootIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "denomination",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_commitment",
-          "type": "bytes32"
-        }
-      ],
-      "name": "deposit",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "filledSubtrees",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getLastRoot",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_left",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_right",
-          "type": "bytes32"
-        }
-      ],
-      "name": "hashLeftRight",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_root",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isKnownRoot",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_nullifierHash",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isSpent",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32[]",
-          "name": "_nullifierHashes",
-          "type": "bytes32[]"
-        }
-      ],
-      "name": "isSpentArray",
-      "outputs": [
-        {
-          "internalType": "bool[]",
-          "name": "spent",
-          "type": "bool[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "levels",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "nextIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "nullifierHashes",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "operator",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "roots",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "token",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
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IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\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The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. 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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
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-                                          "hexvalue": "3332",
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-                                          "isLValue": false,
-                                          "isPure": true,
-                                          "lValueRequested": false,
-                                          "subdenomination": null,
-                                          "token": "number",
-                                          "type": "int_const 32",
-                                          "value": "32"
-                                        },
-                                        "id": 204,
-                                        "name": "Literal",
-                                        "src": "2823:2:0"
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-                                    "id": 205,
-                                    "name": "BinaryOperation",
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-                                      "lValueRequested": false,
-                                      "subdenomination": null,
-                                      "token": "string",
-                                      "type": "literal_string \"data length should be either 0 or 32 bytes\"",
-                                      "value": "data length should be either 0 or 32 bytes"
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-                                    "name": "Literal",
-                                    "src": "2827:44:0"
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-                                        },
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-                                        "src": "2901:4:0"
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-                                        "attributes": {
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-                                            "id": 213,
-                                            "name": "ElementaryTypeNameExpression",
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-                                        "id": 214,
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-                                "id": 216,
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-                                "src": "2880:34:0"
-                              }
-                            ],
-                            "id": 217,
-                            "name": "ExpressionStatement",
-                            "src": "2880:34:0"
-                          },
-                          {
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "isConstant": false,
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-                                  "isPure": false,
-                                  "isStructConstructorCall": false,
-                                  "lValueRequested": false,
-                                  "names": [
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-                                  ],
-                                  "type": "tuple()",
-                                  "type_conversion": false
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-                                "children": [
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": [
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-                                          "typeString": "bool"
-                                        },
-                                        {
-                                          "typeIdentifier": "t_stringliteral_38fa5aabf87e9f42de902eb4d9022484dde7943d80702b79ba468e9fc08f5e5e",
-                                          "typeString": "literal_string \"not enough tokens. Token returns false.\""
-                                        }
-                                      ],
-                                      "overloadedDeclarations": [
-                                        3263,
-                                        3264
-                                      ],
-                                      "referencedDeclaration": 3264,
-                                      "type": "function (bool,string memory) pure",
-                                      "value": "require"
-                                    },
-                                    "id": 218,
-                                    "name": "Identifier",
-                                    "src": "2922:7:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 179,
-                                      "type": "bool",
-                                      "value": "success"
-                                    },
-                                    "id": 219,
-                                    "name": "Identifier",
-                                    "src": "2930:7:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "hexvalue": "6e6f7420656e6f75676820746f6b656e732e20546f6b656e2072657475726e732066616c73652e",
-                                      "isConstant": false,
-                                      "isLValue": false,
-                                      "isPure": true,
-                                      "lValueRequested": false,
-                                      "subdenomination": null,
-                                      "token": "string",
-                                      "type": "literal_string \"not enough tokens. Token returns false.\"",
-                                      "value": "not enough tokens. Token returns false."
-                                    },
-                                    "id": 220,
-                                    "name": "Literal",
-                                    "src": "2939:41:0"
-                                  }
-                                ],
-                                "id": 221,
-                                "name": "FunctionCall",
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-                              }
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-                            "id": 222,
-                            "name": "ExpressionStatement",
-                            "src": "2922:59:0"
-                          }
-                        ],
-                        "id": 223,
-                        "name": "Block",
-                        "src": "2792:196:0"
-                      }
-                    ],
-                    "id": 224,
-                    "name": "IfStatement",
-                    "src": "2771:217:0"
-                  }
-                ],
-                "id": 225,
-                "name": "Block",
-                "src": "2515:477:0"
-              }
-            ],
-            "id": 226,
-            "name": "FunctionDefinition",
-            "src": "2448:544:0"
-          }
-        ],
-        "id": 227,
-        "name": "ContractDefinition",
-        "src": "805:2189:0"
-      }
-    ],
-    "id": 228,
-    "name": "SourceUnit",
-    "src": "755:2240:0"
-  },
-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "networks": {
-    "42220": {
-      "events": {},
-      "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
-      },
-      "address": "0xf1aA668d21Fe0560Af8d2B25047711FE70790B9d",
-      "transactionHash": "0xcb70e996a89f6d9ade8e386155644d4083444a9e240e9fb937f82e773117e55f"
-    }
-  },
-  "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:49:02.007Z",
-  "networkType": "ethereum",
-  "devdoc": {
-    "methods": {
-      "changeOperator(address)": {
-        "details": "operator can change his address "
-      },
-      "deposit(bytes32)": {
-        "details": "Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.",
-        "params": {
-          "_commitment": "the note commitment, which is PedersenHash(nullifier + secret)"
-        }
-      },
-      "getLastRoot()": {
-        "details": "Returns the last root"
-      },
-      "hashLeftRight(bytes32,bytes32)": {
-        "details": "Hash 2 tree leaves, returns MiMC(_left, _right)"
-      },
-      "isKnownRoot(bytes32)": {
-        "details": "Whether the root is present in the root history"
-      },
-      "isSpent(bytes32)": {
-        "details": "whether a note is already spent "
-      },
-      "isSpentArray(bytes32[])": {
-        "details": "whether an array of notes is already spent "
-      },
-      "updateVerifier(address)": {
-        "details": "allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address"
-      },
-      "withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)": {
-        "details": "Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)"
-      }
-    }
-  },
-  "userdoc": {
-    "methods": {}
-  }
-}
\ No newline at end of file
diff --git a/client/contracts/CELOTornado.5.json b/client/contracts/CELOTornado.5.json
deleted file mode 100644
index e5cac11..0000000
--- a/client/contracts/CELOTornado.5.json
+++ /dev/null
@@ -1,7219 +0,0 @@
-{
-  "contractName": "ERC20Tornado",
-  "abi": [
-    {
-      "inputs": [
-        {
-          "internalType": "contract IVerifier",
-          "name": "_verifier",
-          "type": "address"
-        },
-        {
-          "internalType": "uint256",
-          "name": "_denomination",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint32",
-          "name": "_merkleTreeHeight",
-          "type": "uint32"
-        },
-        {
-          "internalType": "address",
-          "name": "_operator",
-          "type": "address"
-        },
-        {
-          "internalType": "address",
-          "name": "_token",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "constructor"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": true,
-          "internalType": "bytes32",
-          "name": "commitment",
-          "type": "bytes32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint32",
-          "name": "leafIndex",
-          "type": "uint32"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "timestamp",
-          "type": "uint256"
-        }
-      ],
-      "name": "Deposit",
-      "type": "event"
-    },
-    {
-      "anonymous": false,
-      "inputs": [
-        {
-          "indexed": false,
-          "internalType": "address",
-          "name": "to",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "bytes32",
-          "name": "nullifierHash",
-          "type": "bytes32"
-        },
-        {
-          "indexed": true,
-          "internalType": "address",
-          "name": "relayer",
-          "type": "address"
-        },
-        {
-          "indexed": false,
-          "internalType": "uint256",
-          "name": "fee",
-          "type": "uint256"
-        }
-      ],
-      "name": "Withdrawal",
-      "type": "event"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "FIELD_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ROOT_HISTORY_SIZE",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "ZERO_VALUE",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
-          "name": "_newOperator",
-          "type": "address"
-        }
-      ],
-      "name": "changeOperator",
-      "outputs": [],
-      "payable": false,
-      "stateMutability": "nonpayable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "commitments",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "currentRootIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "denomination",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_commitment",
-          "type": "bytes32"
-        }
-      ],
-      "name": "deposit",
-      "outputs": [],
-      "payable": true,
-      "stateMutability": "payable",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "filledSubtrees",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "getLastRoot",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_left",
-          "type": "bytes32"
-        },
-        {
-          "internalType": "bytes32",
-          "name": "_right",
-          "type": "bytes32"
-        }
-      ],
-      "name": "hashLeftRight",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "pure",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_root",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isKnownRoot",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "_nullifierHash",
-          "type": "bytes32"
-        }
-      ],
-      "name": "isSpent",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32[]",
-          "name": "_nullifierHashes",
-          "type": "bytes32[]"
-        }
-      ],
-      "name": "isSpentArray",
-      "outputs": [
-        {
-          "internalType": "bool[]",
-          "name": "spent",
-          "type": "bool[]"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "levels",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "nextIndex",
-      "outputs": [
-        {
-          "internalType": "uint32",
-          "name": "",
-          "type": "uint32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "name": "nullifierHashes",
-      "outputs": [
-        {
-          "internalType": "bool",
-          "name": "",
-          "type": "bool"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "operator",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "name": "roots",
-      "outputs": [
-        {
-          "internalType": "bytes32",
-          "name": "",
-          "type": "bytes32"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": true,
-      "inputs": [],
-      "name": "token",
-      "outputs": [
-        {
-          "internalType": "address",
-          "name": "",
-          "type": "address"
-        }
-      ],
-      "payable": false,
-      "stateMutability": "view",
-      "type": "function"
-    },
-    {
-      "constant": false,
-      "inputs": [
-        {
-          "internalType": "address",
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IVerifier\",\"name\":\"_verifier\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"_denomination\",\"type\":\"uint256\"},{\"internalType\":\"uint32\",\"name\":\"_merkleTreeHeight\",\"type\":\"uint32\"},{\"internalType\":\"address\",\"name\":\"_operator\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"_token\",\"type\":\"address\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"bytes32\",\"name\":\"commitment\",\"type\":\"bytes32\"},{\"indexed\":false,\"internalType\":\"uint32\",\"name\":\"leafIndex\",\"type\":\"uint32\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"timestamp\",\"type\":\"uint256\"}],\"name\":\"Deposit\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":false,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"bytes32\",\"name\":\"nullifierHash\",\"type\":\"bytes32\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"relayer\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"fee\",\"type\":\"uint256\"}],\"name\":\"Withdrawal\",\"type\":\"event\"},{\"constant\":true,\"inputs\":[],\"name\":\"FIELD_SIZE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ROOT_HISTORY_SIZE\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"ZERO_VALUE\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"address\",\"name\":\"_newOperator\",\"type\":\"address\"}],\"name\":\"changeOperator\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"name\":\"commitments\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"currentRootIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"denomination\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":false,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_commitment\",\"type\":\"bytes32\"}],\"name\":\"deposit\",\"outputs\":[],\"payable\":true,\"stateMutability\":\"payable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"name\":\"filledSubtrees\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"getLastRoot\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_left\",\"type\":\"bytes32\"},{\"internalType\":\"bytes32\",\"name\":\"_right\",\"type\":\"bytes32\"}],\"name\":\"hashLeftRight\",\"outputs\":[{\"internalType\":\"bytes32\",\"name\":\"\",\"type\":\"bytes32\"}],\"payable\":false,\"stateMutability\":\"pure\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_root\",\"type\":\"bytes32\"}],\"name\":\"isKnownRoot\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32\",\"name\":\"_nullifierHash\",\"type\":\"bytes32\"}],\"name\":\"isSpent\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[{\"internalType\":\"bytes32[]\",\"name\":\"_nullifierHashes\",\"type\":\"bytes32[]\"}],\"name\":\"isSpentArray\",\"outputs\":[{\"internalType\":\"bool[]\",\"name\":\"spent\",\"type\":\"bool[]\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"levels\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\"uint32\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"nextIndex\",\"outputs\":[{\"internalType\":\"uint32\",\"name\":\"\",\"type\":\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The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\",\"params\":{\"_commitment\":\"the note commitment, which is PedersenHash(nullifier + secret)\"}},\"getLastRoot()\":{\"details\":\"Returns the last root\"},\"hashLeftRight(bytes32,bytes32)\":{\"details\":\"Hash 2 tree leaves, returns MiMC(_left, _right)\"},\"isKnownRoot(bytes32)\":{\"details\":\"Whether the root is present in the root history\"},\"isSpent(bytes32)\":{\"details\":\"whether a note is already spent \"},\"isSpentArray(bytes32[])\":{\"details\":\"whether an array of notes is already spent \"},\"updateVerifier(address)\":{\"details\":\"allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. 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-  "source": "// https://tornado.cash\n/*\n* d888888P                                           dP              a88888b.                   dP\n*    88                                              88             d8'   `88                   88\n*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.\n*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88\n*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88\n*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP\n* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo\n*/\n\npragma solidity 0.5.17;\n\nimport \"./Tornado.sol\";\n\ncontract ERC20Tornado is Tornado {\n  address public token;\n\n  constructor(\n    IVerifier _verifier,\n    uint256 _denomination,\n    uint32 _merkleTreeHeight,\n    address _operator,\n    address _token\n  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {\n    token = _token;\n  }\n\n  function _processDeposit() internal {\n    require(msg.value == 0, \"ETH value is supposed to be 0 for ERC20 instance\");\n    _safeErc20TransferFrom(msg.sender, address(this), denomination);\n  }\n\n  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {\n    require(msg.value == _refund, \"Incorrect refund amount received by the contract\");\n\n    _safeErc20Transfer(_recipient, denomination - _fee);\n    if (_fee > 0) {\n      _safeErc20Transfer(_relayer, _fee);\n    }\n\n    if (_refund > 0) {\n      (bool success, ) = _recipient.call.value(_refund)(\"\");\n      if (!success) {\n        // let's return _refund back to the relayer\n        _relayer.transfer(_refund);\n      }\n    }\n  }\n\n  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));\n    require(success, \"not enough allowed tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough allowed tokens. Token returns false.\");\n    }\n  }\n\n  function _safeErc20Transfer(address _to, uint256 _amount) internal {\n    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));\n    require(success, \"not enough tokens\");\n\n    // if contract returns some data lets make sure that is `true` according to standard\n    if (data.length > 0) {\n      require(data.length == 32, \"data length should be either 0 or 32 bytes\");\n      success = abi.decode(data, (bool));\n      require(success, \"not enough tokens. Token returns false.\");\n    }\n  }\n}\n",
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-                                    },
-                                    "children": [
-                                      {
-                                        "attributes": {
-                                          "argumentTypes": null,
-                                          "isConstant": false,
-                                          "isLValue": false,
-                                          "isPure": false,
-                                          "lValueRequested": false,
-                                          "member_name": "length",
-                                          "referencedDeclaration": null,
-                                          "type": "uint256"
-                                        },
-                                        "children": [
-                                          {
-                                            "attributes": {
-                                              "argumentTypes": null,
-                                              "overloadedDeclarations": [
-                                                null
-                                              ],
-                                              "referencedDeclaration": 181,
-                                              "type": "bytes memory",
-                                              "value": "data"
-                                            },
-                                            "id": 202,
-                                            "name": "Identifier",
-                                            "src": "2808:4:0"
-                                          }
-                                        ],
-                                        "id": 203,
-                                        "name": "MemberAccess",
-                                        "src": "2808:11:0"
-                                      },
-                                      {
-                                        "attributes": {
-                                          "argumentTypes": null,
-                                          "hexvalue": "3332",
-                                          "isConstant": false,
-                                          "isLValue": false,
-                                          "isPure": true,
-                                          "lValueRequested": false,
-                                          "subdenomination": null,
-                                          "token": "number",
-                                          "type": "int_const 32",
-                                          "value": "32"
-                                        },
-                                        "id": 204,
-                                        "name": "Literal",
-                                        "src": "2823:2:0"
-                                      }
-                                    ],
-                                    "id": 205,
-                                    "name": "BinaryOperation",
-                                    "src": "2808:17:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "hexvalue": "64617461206c656e6774682073686f756c64206265206569746865722030206f72203332206279746573",
-                                      "isConstant": false,
-                                      "isLValue": false,
-                                      "isPure": true,
-                                      "lValueRequested": false,
-                                      "subdenomination": null,
-                                      "token": "string",
-                                      "type": "literal_string \"data length should be either 0 or 32 bytes\"",
-                                      "value": "data length should be either 0 or 32 bytes"
-                                    },
-                                    "id": 206,
-                                    "name": "Literal",
-                                    "src": "2827:44:0"
-                                  }
-                                ],
-                                "id": 207,
-                                "name": "FunctionCall",
-                                "src": "2800:72:0"
-                              }
-                            ],
-                            "id": 208,
-                            "name": "ExpressionStatement",
-                            "src": "2800:72:0"
-                          },
-                          {
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "isConstant": false,
-                                  "isLValue": false,
-                                  "isPure": false,
-                                  "lValueRequested": false,
-                                  "operator": "=",
-                                  "type": "bool"
-                                },
-                                "children": [
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 179,
-                                      "type": "bool",
-                                      "value": "success"
-                                    },
-                                    "id": 209,
-                                    "name": "Identifier",
-                                    "src": "2880:7:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "isConstant": false,
-                                      "isLValue": false,
-                                      "isPure": false,
-                                      "isStructConstructorCall": false,
-                                      "lValueRequested": false,
-                                      "names": [
-                                        null
-                                      ],
-                                      "type": "bool",
-                                      "type_conversion": false
-                                    },
-                                    "children": [
-                                      {
-                                        "attributes": {
-                                          "argumentTypes": [
-                                            {
-                                              "typeIdentifier": "t_bytes_memory_ptr",
-                                              "typeString": "bytes memory"
-                                            },
-                                            {
-                                              "typeIdentifier": "t_type$_t_bool_$",
-                                              "typeString": "type(bool)"
-                                            }
-                                          ],
-                                          "isConstant": false,
-                                          "isLValue": false,
-                                          "isPure": true,
-                                          "lValueRequested": false,
-                                          "member_name": "decode",
-                                          "referencedDeclaration": null,
-                                          "type": "function () pure"
-                                        },
-                                        "children": [
-                                          {
-                                            "attributes": {
-                                              "argumentTypes": null,
-                                              "overloadedDeclarations": [
-                                                null
-                                              ],
-                                              "referencedDeclaration": 3247,
-                                              "type": "abi",
-                                              "value": "abi"
-                                            },
-                                            "id": 210,
-                                            "name": "Identifier",
-                                            "src": "2890:3:0"
-                                          }
-                                        ],
-                                        "id": 211,
-                                        "name": "MemberAccess",
-                                        "src": "2890:10:0"
-                                      },
-                                      {
-                                        "attributes": {
-                                          "argumentTypes": null,
-                                          "overloadedDeclarations": [
-                                            null
-                                          ],
-                                          "referencedDeclaration": 181,
-                                          "type": "bytes memory",
-                                          "value": "data"
-                                        },
-                                        "id": 212,
-                                        "name": "Identifier",
-                                        "src": "2901:4:0"
-                                      },
-                                      {
-                                        "attributes": {
-                                          "argumentTypes": null,
-                                          "isConstant": false,
-                                          "isInlineArray": false,
-                                          "isLValue": false,
-                                          "isPure": true,
-                                          "lValueRequested": false,
-                                          "type": "type(bool)"
-                                        },
-                                        "children": [
-                                          {
-                                            "attributes": {
-                                              "argumentTypes": null,
-                                              "isConstant": false,
-                                              "isLValue": false,
-                                              "isPure": true,
-                                              "lValueRequested": false,
-                                              "type": "type(bool)",
-                                              "value": "bool"
-                                            },
-                                            "id": 213,
-                                            "name": "ElementaryTypeNameExpression",
-                                            "src": "2908:4:0"
-                                          }
-                                        ],
-                                        "id": 214,
-                                        "name": "TupleExpression",
-                                        "src": "2907:6:0"
-                                      }
-                                    ],
-                                    "id": 215,
-                                    "name": "FunctionCall",
-                                    "src": "2890:24:0"
-                                  }
-                                ],
-                                "id": 216,
-                                "name": "Assignment",
-                                "src": "2880:34:0"
-                              }
-                            ],
-                            "id": 217,
-                            "name": "ExpressionStatement",
-                            "src": "2880:34:0"
-                          },
-                          {
-                            "children": [
-                              {
-                                "attributes": {
-                                  "argumentTypes": null,
-                                  "isConstant": false,
-                                  "isLValue": false,
-                                  "isPure": false,
-                                  "isStructConstructorCall": false,
-                                  "lValueRequested": false,
-                                  "names": [
-                                    null
-                                  ],
-                                  "type": "tuple()",
-                                  "type_conversion": false
-                                },
-                                "children": [
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": [
-                                        {
-                                          "typeIdentifier": "t_bool",
-                                          "typeString": "bool"
-                                        },
-                                        {
-                                          "typeIdentifier": "t_stringliteral_38fa5aabf87e9f42de902eb4d9022484dde7943d80702b79ba468e9fc08f5e5e",
-                                          "typeString": "literal_string \"not enough tokens. Token returns false.\""
-                                        }
-                                      ],
-                                      "overloadedDeclarations": [
-                                        3263,
-                                        3264
-                                      ],
-                                      "referencedDeclaration": 3264,
-                                      "type": "function (bool,string memory) pure",
-                                      "value": "require"
-                                    },
-                                    "id": 218,
-                                    "name": "Identifier",
-                                    "src": "2922:7:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "overloadedDeclarations": [
-                                        null
-                                      ],
-                                      "referencedDeclaration": 179,
-                                      "type": "bool",
-                                      "value": "success"
-                                    },
-                                    "id": 219,
-                                    "name": "Identifier",
-                                    "src": "2930:7:0"
-                                  },
-                                  {
-                                    "attributes": {
-                                      "argumentTypes": null,
-                                      "hexvalue": "6e6f7420656e6f75676820746f6b656e732e20546f6b656e2072657475726e732066616c73652e",
-                                      "isConstant": false,
-                                      "isLValue": false,
-                                      "isPure": true,
-                                      "lValueRequested": false,
-                                      "subdenomination": null,
-                                      "token": "string",
-                                      "type": "literal_string \"not enough tokens. Token returns false.\"",
-                                      "value": "not enough tokens. Token returns false."
-                                    },
-                                    "id": 220,
-                                    "name": "Literal",
-                                    "src": "2939:41:0"
-                                  }
-                                ],
-                                "id": 221,
-                                "name": "FunctionCall",
-                                "src": "2922:59:0"
-                              }
-                            ],
-                            "id": 222,
-                            "name": "ExpressionStatement",
-                            "src": "2922:59:0"
-                          }
-                        ],
-                        "id": 223,
-                        "name": "Block",
-                        "src": "2792:196:0"
-                      }
-                    ],
-                    "id": 224,
-                    "name": "IfStatement",
-                    "src": "2771:217:0"
-                  }
-                ],
-                "id": 225,
-                "name": "Block",
-                "src": "2515:477:0"
-              }
-            ],
-            "id": 226,
-            "name": "FunctionDefinition",
-            "src": "2448:544:0"
-          }
-        ],
-        "id": 227,
-        "name": "ContractDefinition",
-        "src": "805:2189:0"
-      }
-    ],
-    "id": 228,
-    "name": "SourceUnit",
-    "src": "755:2240:0"
-  },
-  "compiler": {
-    "name": "solc",
-    "version": "0.5.17+commit.d19bba13.Emscripten.clang"
-  },
-  "networks": {
-    "42220": {
-      "events": {},
-      "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
-      },
-      "address": "0x0824C3Ed3bF48E5A0dB14c36a1fa44D68f0D79AC",
-      "transactionHash": "0xba304f60ab6893d7e817560415b664f3fc974570c685426bbae19c1e1a34b420"
-    }
-  },
-  "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:45:46.951Z",
-  "networkType": "ethereum",
-  "devdoc": {
-    "methods": {
-      "changeOperator(address)": {
-        "details": "operator can change his address "
-      },
-      "deposit(bytes32)": {
-        "details": "Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.",
-        "params": {
-          "_commitment": "the note commitment, which is PedersenHash(nullifier + secret)"
-        }
-      },
-      "getLastRoot()": {
-        "details": "Returns the last root"
-      },
-      "hashLeftRight(bytes32,bytes32)": {
-        "details": "Hash 2 tree leaves, returns MiMC(_left, _right)"
-      },
-      "isKnownRoot(bytes32)": {
-        "details": "Whether the root is present in the root history"
-      },
-      "isSpent(bytes32)": {
-        "details": "whether a note is already spent "
-      },
-      "isSpentArray(bytes32[])": {
-        "details": "whether an array of notes is already spent "
-      },
-      "updateVerifier(address)": {
-        "details": "allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held. After that operator rights are supposed to be transferred to zero address"
-      },
-      "withdraw(bytes,bytes32,bytes32,address,address,uint256,uint256)": {
-        "details": "Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs `input` array consists of: - merkle root of all deposits in the contract - hash of unique deposit nullifier to prevent double spends - the recipient of funds - optional fee that goes to the transaction sender (usually a relay)"
-      }
-    }
-  },
-  "userdoc": {
-    "methods": {}
-  }
-}
\ No newline at end of file
diff --git a/client/contracts/ERC20Mock.json b/client/contracts/ERC20Mock.json
index 004db22..cc5f0aa 100644
--- a/client/contracts/ERC20Mock.json
+++ b/client/contracts/ERC20Mock.json
@@ -917,7 +917,7 @@
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:54:26.426Z",
+  "updatedAt": "2021-04-02T22:56:11.659Z",
   "networkType": "ethereum",
   "devdoc": {
     "methods": {
diff --git a/client/contracts/ERC20Tornado.json b/client/contracts/ERC20Tornado.json
index 0b07c2d..6696fd1 100644
--- a/client/contracts/ERC20Tornado.json
+++ b/client/contracts/ERC20Tornado.json
@@ -8314,14 +8314,15 @@
     "42220": {
       "events": {},
       "links": {
-        "Hasher": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d"
+        "Hasher": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE"
       },
-      "address": "0x89c8BB50BBa5B15B5044bdA870d1c34322B66171",
-      "transactionHash": "0xa26063a78dbf50e366559e0eaefd298963a7176b318d163a926d199dc9a1268e"
+      "address": "0xC8980dcBc56F5CEdd5356D190cB42125e16486eb",
+      "transactionHash": "0xbbd8007eb57eeeb98a12b9807e7d23d46e64b834d929967a9abf6cd0984d34bd"
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T22:30:43.183Z",
+  "updatedAt": "2021-04-02T22:56:11.626Z",
+  "networkType": "ethereum",
   "devdoc": {
     "methods": {
       "changeOperator(address)": {
diff --git a/client/contracts/FeeManager.json b/client/contracts/FeeManager.json
index 2b27f9b..aafc6bd 100644
--- a/client/contracts/FeeManager.json
+++ b/client/contracts/FeeManager.json
@@ -304,7 +304,7 @@
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 2131,
+                            "referencedDeclaration": 1068,
                             "src": "245:3:1",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
@@ -380,10 +380,10 @@
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        2134,
-                        2135
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 2135,
+                      "referencedDeclaration": 1072,
                       "src": "237:7:1",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
@@ -538,7 +538,7 @@
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 2131,
+                            "referencedDeclaration": 1068,
                             "src": "392:3:1",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
@@ -614,10 +614,10 @@
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        2134,
-                        2135
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 2135,
+                      "referencedDeclaration": 1072,
                       "src": "384:7:1",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
@@ -1061,10 +1061,10 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                2134,
-                                2135
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 2135,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
@@ -1105,7 +1105,7 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 2131,
+                                      "referencedDeclaration": 1068,
                                       "type": "msg",
                                       "value": "msg"
                                     },
@@ -1318,10 +1318,10 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                2134,
-                                2135
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 2135,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
@@ -1362,7 +1362,7 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 2131,
+                                      "referencedDeclaration": 1068,
                                       "type": "msg",
                                       "value": "msg"
                                     },
@@ -1496,9 +1496,17 @@
     "name": "solc",
     "version": "0.5.17+commit.d19bba13.Emscripten.clang"
   },
-  "networks": {},
+  "networks": {
+    "42220": {
+      "events": {},
+      "links": {},
+      "address": "0x7d21531Adf9d029Acc8C5b225d77Ce2a819887B6",
+      "transactionHash": "0x1e7d99d96bbf8bce1e1fb870088e2cd6cbdc27a87e8274d3cdb72042686b285d"
+    }
+  },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T20:48:07.401Z",
+  "updatedAt": "2021-04-02T22:56:11.656Z",
+  "networkType": "ethereum",
   "devdoc": {
     "methods": {}
   },
diff --git a/client/contracts/Hasher.json b/client/contracts/Hasher.json
index 906ee4a..53cb6ef 100644
--- a/client/contracts/Hasher.json
+++ b/client/contracts/Hasher.json
@@ -40,8 +40,8 @@
     "42220": {
       "events": {},
       "links": {},
-      "address": "0xD75035293f552aB5c33483f321DBf0DfA1C7c71d",
-      "transactionHash": "0x0f9102eb1cfa4f83630e72d2b0dcb9dec9285859895f39ca224e7500f6282689"
+      "address": "0x5666A6E07d7b991489b1D0f53d37B664B312a1fE",
+      "transactionHash": "0x70b1d0c40688aed10a6281b09f1159e9a5d44b5654cd18f6ef7d56ee14d68bcf"
     },
     "44787": {
       "events": {},
@@ -51,5 +51,6 @@
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T22:30:43.196Z"
+  "updatedAt": "2021-04-02T22:56:11.658Z",
+  "networkType": "ethereum"
 }
\ No newline at end of file
diff --git a/client/contracts/IFeeManager.json b/client/contracts/IFeeManager.json
index e182102..66f16da 100644
--- a/client/contracts/IFeeManager.json
+++ b/client/contracts/IFeeManager.json
@@ -28,47 +28,47 @@
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol",
     "exportedSymbols": {
       "IFeeManager": [
-        654
+        707
       ],
       "IVerifier": [
-        648
+        701
       ],
       "Tornado": [
-        970
+        1023
       ]
     },
-    "id": 971,
+    "id": 1024,
     "nodeType": "SourceUnit",
     "nodes": [
       {
-        "id": 634,
+        "id": 687,
         "literals": [
           "solidity",
           "0.5",
           ".17"
         ],
         "nodeType": "PragmaDirective",
-        "src": "0:23:2"
+        "src": "0:23:3"
       },
       {
         "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol",
         "file": "./MerkleTreeWithHistory.sol",
-        "id": 635,
+        "id": 688,
         "nodeType": "ImportDirective",
-        "scope": 971,
-        "sourceUnit": 633,
-        "src": "25:37:2",
+        "scope": 1024,
+        "sourceUnit": 686,
+        "src": "25:37:3",
         "symbolAliases": [],
         "unitAlias": ""
       },
       {
         "absolutePath": "@openzeppelin/contracts/utils/ReentrancyGuard.sol",
         "file": "@openzeppelin/contracts/utils/ReentrancyGuard.sol",
-        "id": 636,
+        "id": 689,
         "nodeType": "ImportDirective",
-        "scope": 971,
-        "sourceUnit": 1001,
-        "src": "63:59:2",
+        "scope": 1024,
+        "sourceUnit": 1054,
+        "src": "63:59:3",
         "symbolAliases": [],
         "unitAlias": ""
       },
@@ -78,9 +78,9 @@
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": false,
-        "id": 648,
+        "id": 701,
         "linearizedBaseContracts": [
-          648
+          701
         ],
         "name": "IVerifier",
         "nodeType": "ContractDefinition",
@@ -88,23 +88,23 @@
           {
             "body": null,
             "documentation": null,
-            "id": 647,
+            "id": 700,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "verifyProof",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 643,
+              "id": 696,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 638,
+                  "id": 691,
                   "name": "_proof",
                   "nodeType": "VariableDeclaration",
-                  "scope": 647,
-                  "src": "168:19:2",
+                  "scope": 700,
+                  "src": "168:19:3",
                   "stateVariable": false,
                   "storageLocation": "memory",
                   "typeDescriptions": {
@@ -112,10 +112,10 @@
                     "typeString": "bytes"
                   },
                   "typeName": {
-                    "id": 637,
+                    "id": 690,
                     "name": "bytes",
                     "nodeType": "ElementaryTypeName",
-                    "src": "168:5:2",
+                    "src": "168:5:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes_storage_ptr",
                       "typeString": "bytes"
@@ -126,11 +126,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 642,
+                  "id": 695,
                   "name": "_input",
                   "nodeType": "VariableDeclaration",
-                  "scope": 647,
-                  "src": "189:24:2",
+                  "scope": 700,
+                  "src": "189:24:3",
                   "stateVariable": false,
                   "storageLocation": "memory",
                   "typeDescriptions": {
@@ -139,27 +139,27 @@
                   },
                   "typeName": {
                     "baseType": {
-                      "id": 639,
+                      "id": 692,
                       "name": "uint256",
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                         "typeString": "uint256"
                       }
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                       "kind": "number",
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                       "nodeType": "Literal",
-                      "src": "197:1:2",
+                      "src": "197:1:3",
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@@ -168,7 +168,7 @@
                       "value": "6"
                     },
                     "nodeType": "ArrayTypeName",
-                    "src": "189:10:2",
+                    "src": "189:10:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_uint256_$6_storage_ptr",
                       "typeString": "uint256[6]"
@@ -178,19 +178,19 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "167:47:2"
+              "src": "167:47:3"
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@@ -198,10 +198,10 @@
                     "typeString": "bool"
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+                    "id": 697,
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@@ -211,17 +211,17 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "229:6:2"
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-            "src": "147:89:2",
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           }
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-        "scope": 971,
-        "src": "124:114:2"
+        "scope": 1024,
+        "src": "124:114:3"
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@@ -229,9 +229,9 @@
         "contractKind": "contract",
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         "fullyImplemented": false,
-        "id": 654,
+        "id": 707,
         "linearizedBaseContracts": [
-          654
+          707
         ],
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@@ -239,29 +239,29 @@
           {
             "body": null,
             "documentation": null,
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+            "id": 706,
             "implemented": false,
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             "modifiers": [],
             "name": "feeTo",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 649,
+              "id": 702,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "279:2:2"
+              "src": "279:2:3"
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+                  "src": "305:7:3",
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@@ -269,10 +269,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 650,
+                    "id": 703,
                     "name": "address",
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-                    "src": "305:7:2",
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                       "typeIdentifier": "t_address",
@@ -283,17 +283,17 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "304:9:2"
+              "src": "304:9:3"
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-            "scope": 654,
-            "src": "265:49:2",
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+            "src": "265:49:3",
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           }
         ],
-        "scope": 971,
-        "src": "240:76:2"
+        "scope": 1024,
+        "src": "240:76:3"
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@@ -301,62 +301,62 @@
             "arguments": null,
             "baseName": {
               "contractScope": null,
-              "id": 655,
+              "id": 708,
               "name": "MerkleTreeWithHistory",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 632,
-              "src": "338:21:2",
+              "referencedDeclaration": 685,
+              "src": "338:21:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_MerkleTreeWithHistory_$632",
+                "typeIdentifier": "t_contract$_MerkleTreeWithHistory_$685",
                 "typeString": "contract MerkleTreeWithHistory"
               }
             },
-            "id": 656,
+            "id": 709,
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-            "src": "338:21:2"
+            "src": "338:21:3"
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             "baseName": {
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-              "id": 657,
+              "id": 710,
               "name": "ReentrancyGuard",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1000,
-              "src": "361:15:2",
+              "referencedDeclaration": 1053,
+              "src": "361:15:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_ReentrancyGuard_$1000",
+                "typeIdentifier": "t_contract$_ReentrancyGuard_$1053",
                 "typeString": "contract ReentrancyGuard"
               }
             },
-            "id": 658,
+            "id": 711,
             "nodeType": "InheritanceSpecifier",
-            "src": "361:15:2"
+            "src": "361:15:3"
           }
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         "contractDependencies": [
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-          1000
+          685,
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         "linearizedBaseContracts": [
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-          1000,
-          632
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         "name": "Tornado",
         "nodeType": "ContractDefinition",
         "nodes": [
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             "constant": false,
-            "id": 660,
+            "id": 713,
             "name": "denomination",
             "nodeType": "VariableDeclaration",
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-            "src": "381:27:2",
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@@ -364,10 +364,10 @@
               "typeString": "uint256"
             },
             "typeName": {
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               "name": "uint256",
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                 "typeString": "uint256"
@@ -378,11 +378,11 @@
           },
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             "name": "nullifierHashes",
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-            "src": "412:47:2",
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@@ -390,28 +390,28 @@
               "typeString": "mapping(bytes32 => bool)"
             },
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                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "412:24:2",
+              "src": "412:24:3",
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                 "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                 "typeString": "mapping(bytes32 => bool)"
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               "valueType": {
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-                "src": "431:4:2",
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@@ -423,11 +423,11 @@
           },
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             "constant": false,
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             "name": "commitments",
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-            "src": "554:43:2",
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@@ -435,28 +435,28 @@
               "typeString": "mapping(bytes32 => bool)"
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                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "554:24:2",
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                 "typeString": "mapping(bytes32 => bool)"
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@@ -468,26 +468,26 @@
           },
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             "constant": false,
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             "name": "verifier",
             "nodeType": "VariableDeclaration",
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-            "src": "601:25:2",
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+            "src": "601:25:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IVerifier_$648",
+              "typeIdentifier": "t_contract$_IVerifier_$701",
               "typeString": "contract IVerifier"
             },
             "typeName": {
               "contractScope": null,
-              "id": 669,
+              "id": 722,
               "name": "IVerifier",
               "nodeType": "UserDefinedTypeName",
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-              "src": "601:9:2",
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+              "src": "601:9:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IVerifier_$648",
+                "typeIdentifier": "t_contract$_IVerifier_$701",
                 "typeString": "contract IVerifier"
               }
             },
@@ -496,26 +496,26 @@
           },
           {
             "constant": false,
-            "id": 672,
+            "id": 725,
             "name": "feeManager",
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-            "scope": 970,
-            "src": "630:29:2",
+            "scope": 1023,
+            "src": "630:29:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IFeeManager_$654",
+              "typeIdentifier": "t_contract$_IFeeManager_$707",
               "typeString": "contract IFeeManager"
             },
             "typeName": {
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               "name": "IFeeManager",
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-              "src": "630:11:2",
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+              "src": "630:11:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IFeeManager_$654",
+                "typeIdentifier": "t_contract$_IFeeManager_$707",
                 "typeString": "contract IFeeManager"
               }
             },
@@ -524,11 +524,11 @@
           },
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             "name": "operator",
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-            "src": "819:23:2",
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@@ -536,10 +536,10 @@
               "typeString": "address"
             },
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+              "id": 726,
               "name": "address",
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               "stateMutability": "nonpayable",
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                 "typeIdentifier": "t_address",
@@ -551,9 +551,9 @@
           },
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+              "id": 738,
               "nodeType": "Block",
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+              "src": "868:90:3",
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                 {
                   "expression": {
@@ -565,7 +565,7 @@
                           "typeIdentifier": "t_address",
                           "typeString": "address"
                         },
-                        "id": 680,
+                        "id": 733,
                         "isConstant": false,
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@@ -574,18 +574,18 @@
                           "argumentTypes": null,
                           "expression": {
                             "argumentTypes": null,
-                            "id": 677,
+                            "id": 730,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 1015,
-                            "src": "882:3:2",
+                            "referencedDeclaration": 1068,
+                            "src": "882:3:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 678,
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                           "isConstant": false,
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@@ -593,7 +593,7 @@
                           "memberName": "sender",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "882:10:2",
+                          "src": "882:10:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address_payable",
                             "typeString": "address payable"
@@ -603,18 +603,18 @@
                         "operator": "==",
                         "rightExpression": {
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-                          "id": 679,
+                          "id": 732,
                           "name": "operator",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 674,
-                          "src": "896:8:2",
+                          "referencedDeclaration": 727,
+                          "src": "896:8:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address",
                             "typeString": "address"
                           }
                         },
-                        "src": "882:22:2",
+                        "src": "882:22:3",
                         "typeDescriptions": {
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                           "typeString": "bool"
@@ -623,14 +623,14 @@
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "906:39:2",
+                        "src": "906:39:3",
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@@ -650,21 +650,21 @@
                           "typeString": "literal_string \"Only operator can call this function.\""
                         }
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                       "overloadedDeclarations": [
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-                      "src": "874:7:2",
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                       "typeDescriptions": {
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                         "typeString": "function (bool,string memory) pure"
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@@ -672,54 +672,54 @@
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                     "nodeType": "FunctionCall",
-                    "src": "874:72:2",
+                    "src": "874:72:3",
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                       "typeString": "tuple()"
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                   },
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                   "indexed": true,
                   "name": "commitment",
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@@ -727,10 +727,10 @@
                     "typeString": "bytes32"
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@@ -741,12 +741,12 @@
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@@ -754,10 +754,10 @@
                     "typeString": "uint32"
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-                    "src": "1004:6:2",
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@@ -768,12 +768,12 @@
                 },
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                   "name": "timestamp",
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-                  "src": "1022:17:2",
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@@ -781,10 +781,10 @@
                     "typeString": "uint256"
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+                    "id": 744,
                     "name": "uint256",
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-                    "src": "1022:7:2",
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                     "typeDescriptions": {
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                       "typeString": "uint256"
@@ -794,28 +794,28 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "975:65:2"
+              "src": "975:65:3"
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+            "src": "962:79:3"
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+            "id": 757,
             "name": "Withdrawal",
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@@ -823,10 +823,10 @@
                     "typeString": "address"
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@@ -838,12 +838,12 @@
                 },
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-                  "src": "1073:21:2",
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                   "stateVariable": false,
                   "storageLocation": "default",
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@@ -851,10 +851,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 697,
+                    "id": 750,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1073:7:2",
+                    "src": "1073:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -865,12 +865,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 700,
+                  "id": 753,
                   "indexed": true,
                   "name": "relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1096:23:2",
+                  "scope": 757,
+                  "src": "1096:23:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -878,10 +878,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 699,
+                    "id": 752,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1096:7:2",
+                    "src": "1096:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -893,12 +893,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 702,
+                  "id": 755,
                   "indexed": false,
                   "name": "fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1121:11:2",
+                  "scope": 757,
+                  "src": "1121:11:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -906,10 +906,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 701,
+                    "id": 754,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1121:7:2",
+                    "src": "1121:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -919,15 +919,15 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1060:73:2"
+              "src": "1060:73:3"
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-            "src": "1044:90:2"
+            "src": "1044:90:3"
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+              "id": 796,
               "nodeType": "Block",
-              "src": "1631:194:2",
+              "src": "1631:194:3",
               "statements": [
                 {
                   "expression": {
@@ -939,19 +939,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 723,
+                        "id": 776,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
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+                          "id": 774,
                           "name": "_denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 710,
-                          "src": "1645:13:2",
+                          "referencedDeclaration": 763,
+                          "src": "1645:13:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -962,14 +962,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 722,
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                           "isConstant": false,
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                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1661:1:2",
+                          "src": "1661:1:3",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -977,7 +977,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1645:17:2",
+                        "src": "1645:17:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -986,14 +986,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "64656e6f6d696e6174696f6e2073686f756c642062652067726561746572207468616e2030",
-                        "id": 724,
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                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1664:39:2",
+                        "src": "1664:39:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_04818fb803bf7e7ff6c9059d97eae335b77b108931ead0a529924d35ccaf3fc8",
@@ -1013,21 +1013,21 @@
                           "typeString": "literal_string \"denomination should be greater than 0\""
                         }
                       ],
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+                      "id": 773,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
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+                        1071,
+                        1072
                       ],
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+                      "src": "1637:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
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@@ -1035,34 +1035,34 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1637:67:2",
+                    "src": "1637:67:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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                     "leftHandSide": {
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+                      "id": 780,
                       "name": "verifier",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 670,
-                      "src": "1710:8:2",
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+                      "src": "1710:8:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
@@ -1070,45 +1070,45 @@
                     "operator": "=",
                     "rightHandSide": {
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                       "name": "_verifier",
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-                      "src": "1721:9:2",
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                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
-                    "src": "1710:20:2",
+                    "src": "1710:20:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
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                       "name": "feeManager",
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                       "overloadedDeclarations": [],
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-                      "src": "1736:10:2",
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+                      "src": "1736:10:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
@@ -1116,43 +1116,43 @@
                     "operator": "=",
                     "rightHandSide": {
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                       "name": "_feeManager",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
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-                      "src": "1749:11:2",
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                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
-                    "src": "1736:24:2",
+                    "src": "1736:24:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
                     }
                   },
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+                  "src": "1736:24:3"
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+                    "id": 790,
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                     "leftHandSide": {
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                       "name": "operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 674,
-                      "src": "1766:8:2",
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+                      "src": "1766:8:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -1162,43 +1162,43 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 736,
+                      "id": 789,
                       "name": "_operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 714,
-                      "src": "1777:9:2",
+                      "referencedDeclaration": 767,
+                      "src": "1777:9:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1766:20:2",
+                    "src": "1766:20:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
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+                  "id": 791,
                   "nodeType": "ExpressionStatement",
-                  "src": "1766:20:2"
+                  "src": "1766:20:3"
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                     "lValueRequested": false,
                     "leftHandSide": {
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-                      "id": 739,
+                      "id": 792,
                       "name": "denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 660,
-                      "src": "1792:12:2",
+                      "referencedDeclaration": 713,
+                      "src": "1792:12:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1208,31 +1208,31 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 740,
+                      "id": 793,
                       "name": "_denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 710,
-                      "src": "1807:13:2",
+                      "referencedDeclaration": 763,
+                      "src": "1807:13:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
                       }
                     },
-                    "src": "1792:28:2",
+                    "src": "1792:28:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     }
                   },
-                  "id": 742,
+                  "id": 795,
                   "nodeType": "ExpressionStatement",
-                  "src": "1792:28:2"
+                  "src": "1792:28:3"
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               ]
             },
             "documentation": "@dev The constructor\n@param _verifier the address of SNARK verifier for this contract\n@param _denomination transfer amount for each deposit\n@param _merkleTreeHeight the height of deposits' Merkle Tree\n@param _operator operator address (see operator comment above)",
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+            "id": 797,
             "implemented": true,
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@@ -1240,64 +1240,64 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 717,
+                    "id": 770,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 712,
-                    "src": "1605:17:2",
+                    "referencedDeclaration": 765,
+                    "src": "1605:17:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
                     }
                   }
                 ],
-                "id": 718,
+                "id": 771,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 716,
+                  "id": 769,
                   "name": "MerkleTreeWithHistory",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 632,
-                  "src": "1583:21:2",
+                  "referencedDeclaration": 685,
+                  "src": "1583:21:3",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$632_$",
+                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$685_$",
                     "typeString": "type(contract MerkleTreeWithHistory)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 715,
+              "id": 768,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 706,
+                  "id": 759,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1450:19:2",
+                  "scope": 797,
+                  "src": "1450:19:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$648",
+                    "typeIdentifier": "t_contract$_IVerifier_$701",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 705,
+                    "id": 758,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 648,
-                    "src": "1450:9:2",
+                    "referencedDeclaration": 701,
+                    "src": "1450:9:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
@@ -1306,26 +1306,26 @@
                 },
                 {
                   "constant": false,
-                  "id": 708,
+                  "id": 761,
                   "name": "_feeManager",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1475:23:2",
+                  "scope": 797,
+                  "src": "1475:23:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeIdentifier": "t_contract$_IFeeManager_$707",
                     "typeString": "contract IFeeManager"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 707,
+                    "id": 760,
                     "name": "IFeeManager",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 654,
-                    "src": "1475:11:2",
+                    "referencedDeclaration": 707,
+                    "src": "1475:11:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
                     }
                   },
@@ -1334,11 +1334,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 710,
+                  "id": 763,
                   "name": "_denomination",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1504:21:2",
+                  "scope": 797,
+                  "src": "1504:21:3",
                   "stateVariable": false,
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                   "typeDescriptions": {
@@ -1346,10 +1346,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 709,
+                    "id": 762,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1504:7:2",
+                    "src": "1504:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -1360,11 +1360,11 @@
                 },
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                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "1531:24:2",
+                  "scope": 797,
+                  "src": "1531:24:3",
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                   "typeDescriptions": {
@@ -1372,10 +1372,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 711,
+                    "id": 764,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1531:6:2",
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                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -1386,11 +1386,11 @@
                 },
                 {
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                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
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-                  "src": "1561:17:2",
+                  "scope": 797,
+                  "src": "1561:17:3",
                   "stateVariable": false,
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@@ -1398,10 +1398,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 713,
+                    "id": 766,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1561:7:2",
+                    "src": "1561:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -1412,25 +1412,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1444:138:2"
+              "src": "1444:138:3"
             },
             "returnParameters": {
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+              "id": 772,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1631:0:2"
+              "src": "1631:0:3"
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-            "scope": 970,
-            "src": "1433:392:2",
+            "scope": 1023,
+            "src": "1433:392:3",
             "stateMutability": "nonpayable",
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             "visibility": "public"
           },
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+              "id": 834,
               "nodeType": "Block",
-              "src": "2141:256:2",
+              "src": "2141:256:3",
               "statements": [
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@@ -1438,7 +1438,7 @@
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@@ -1446,31 +1446,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "2155:25:2",
+                        "src": "2155:25:3",
                         "subExpression": {
                           "argumentTypes": null,
                           "baseExpression": {
                             "argumentTypes": null,
-                            "id": 752,
+                            "id": 805,
                             "name": "commitments",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 668,
-                            "src": "2156:11:2",
+                            "referencedDeclaration": 721,
+                            "src": "2156:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
-                          "id": 754,
+                          "id": 807,
                           "indexExpression": {
                             "argumentTypes": null,
-                            "id": 753,
+                            "id": 806,
                             "name": "_commitment",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 746,
-                            "src": "2168:11:2",
+                            "referencedDeclaration": 799,
+                            "src": "2168:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -1481,7 +1481,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "2156:24:2",
+                          "src": "2156:24:3",
                           "typeDescriptions": {
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                             "typeString": "bool"
@@ -1495,14 +1495,14 @@
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                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "2182:35:2",
+                        "src": "2182:35:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_ae5f231636554c1cb3bf839359e4dfbb338ccb221c7c5dbdf2da91ddc6e2ee6b",
@@ -1522,21 +1522,21 @@
                           "typeString": "literal_string \"The commitment has been submitted\""
                         }
                       ],
-                      "id": 751,
+                      "id": 804,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "2147:7:2",
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+                      "src": "2147:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 757,
+                    "id": 810,
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@@ -1544,28 +1544,28 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2147:71:2",
+                    "src": "2147:71:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
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+                  "src": "2147:71:3"
                 },
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                   "assignments": [
-                    760
+                    813
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                   "declarations": [
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                       "name": "insertedIndex",
                       "nodeType": "VariableDeclaration",
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-                      "src": "2225:20:2",
+                      "scope": 834,
+                      "src": "2225:20:3",
                       "stateVariable": false,
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@@ -1573,10 +1573,10 @@
                         "typeString": "uint32"
                       },
                       "typeName": {
-                        "id": 759,
+                        "id": 812,
                         "name": "uint32",
                         "nodeType": "ElementaryTypeName",
-                        "src": "2225:6:2",
+                        "src": "2225:6:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint32",
                           "typeString": "uint32"
@@ -1586,18 +1586,18 @@
                       "visibility": "internal"
                     }
                   ],
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+                  "id": 817,
                   "initialValue": {
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                     "arguments": [
                       {
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+                        "id": 815,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2256:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2256:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1611,18 +1611,18 @@
                           "typeString": "bytes32"
                         }
                       ],
-                      "id": 761,
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                       "name": "_insert",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 574,
-                      "src": "2248:7:2",
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                         "typeIdentifier": "t_function_internal_nonpayable$_t_bytes32_$returns$_t_uint32_$",
                         "typeString": "function (bytes32) returns (uint32)"
                       }
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@@ -1630,19 +1630,19 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2248:20:2",
+                    "src": "2248:20:3",
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                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
                     }
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@@ -1651,26 +1651,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 765,
+                        "id": 818,
                         "name": "commitments",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 668,
-                        "src": "2274:11:2",
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+                        "src": "2274:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
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                       "indexExpression": {
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                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
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-                        "src": "2286:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2286:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1681,7 +1681,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "2274:24:2",
+                      "src": "2274:24:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
@@ -1692,14 +1692,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
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+                      "id": 821,
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                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "2301:4:2",
+                      "src": "2301:4:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
@@ -1707,15 +1707,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "2274:31:2",
+                    "src": "2274:31:3",
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                       "typeString": "bool"
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@@ -1723,18 +1723,18 @@
                     "arguments": [],
                     "expression": {
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                       "name": "_processDeposit",
                       "nodeType": "Identifier",
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-                      "src": "2311:15:2",
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                         "typeString": "function ()"
                       }
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@@ -1742,15 +1742,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2311:17:2",
+                    "src": "2311:17:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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+                  "src": "2311:17:3"
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                 {
                   "eventCall": {
@@ -1758,12 +1758,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 775,
+                        "id": 828,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2348:11:2",
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+                        "src": "2348:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1771,12 +1771,12 @@
                       },
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-                        "id": 776,
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                         "name": "insertedIndex",
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                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 760,
-                        "src": "2361:13:2",
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+                        "src": "2361:13:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint32",
                           "typeString": "uint32"
@@ -1786,18 +1786,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 777,
+                          "id": 830,
                           "name": "block",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 1005,
-                          "src": "2376:5:2",
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                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_block",
                             "typeString": "block"
                           }
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@@ -1805,7 +1805,7 @@
                         "memberName": "timestamp",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "2376:15:2",
+                        "src": "2376:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1827,18 +1827,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 774,
+                      "id": 827,
                       "name": "Deposit",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 694,
-                      "src": "2340:7:2",
+                      "referencedDeclaration": 747,
+                      "src": "2340:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_bytes32_$_t_uint32_$_t_uint256_$returns$__$",
                         "typeString": "function (bytes32,uint32,uint256)"
                       }
                     },
-                    "id": 779,
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@@ -1846,56 +1846,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2340:52:2",
+                    "src": "2340:52:3",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
                     }
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+                  "id": 833,
                   "nodeType": "EmitStatement",
-                  "src": "2335:57:2"
+                  "src": "2335:57:3"
                 }
               ]
             },
             "documentation": "@dev Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\n@param _commitment the note commitment, which is PedersenHash(nullifier + secret)",
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+            "id": 835,
             "implemented": true,
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             "modifiers": [
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-                "id": 749,
+                "id": 802,
                 "modifierName": {
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+                  "id": 801,
                   "name": "nonReentrant",
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-                  "referencedDeclaration": 999,
-                  "src": "2128:12:2",
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+                  "src": "2128:12:3",
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                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               }
             ],
             "name": "deposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 747,
+              "id": 800,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
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+                  "id": 799,
                   "name": "_commitment",
                   "nodeType": "VariableDeclaration",
-                  "scope": 782,
-                  "src": "2090:19:2",
+                  "scope": 835,
+                  "src": "2090:19:3",
                   "stateVariable": false,
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@@ -1903,10 +1903,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 745,
+                    "id": 798,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2090:7:2",
+                    "src": "2090:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -1916,16 +1916,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2089:21:2"
+              "src": "2089:21:3"
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             "returnParameters": {
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+              "src": "2141:0:3"
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-            "src": "2073:324:2",
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+            "src": "2073:324:3",
             "stateMutability": "payable",
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             "visibility": "external"
@@ -1933,35 +1933,35 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 785,
+            "id": 838,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
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-              "src": "2484:2:2"
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+              "src": "2495:0:3"
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-            "scope": 970,
-            "src": "2460:36:2",
+            "scope": 1023,
+            "src": "2460:36:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "internal"
           },
           {
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+              "id": 925,
               "nodeType": "Block",
-              "src": "3088:606:2",
+              "src": "3088:606:3",
               "statements": [
                 {
                   "expression": {
@@ -1973,19 +1973,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 807,
+                        "id": 860,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
-                          "id": 805,
+                          "id": 858,
                           "name": "_fee",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 797,
-                          "src": "3102:4:2",
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+                          "src": "3102:4:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -1995,18 +1995,18 @@
                         "operator": "<=",
                         "rightExpression": {
                           "argumentTypes": null,
-                          "id": 806,
+                          "id": 859,
                           "name": "denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 660,
-                          "src": "3110:12:2",
+                          "referencedDeclaration": 713,
+                          "src": "3110:12:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "3102:20:2",
+                        "src": "3102:20:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2015,14 +2015,14 @@
                       {
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                         "hexValue": "4665652065786365656473207472616e736665722076616c7565",
-                        "id": 808,
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                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3124:28:2",
+                        "src": "3124:28:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2ce218df547d416f80ea8a5deadaf9453d23523ffa5f2e880a48adfdb4053a9c",
@@ -2042,21 +2042,21 @@
                           "typeString": "literal_string \"Fee exceeds transfer value\""
                         }
                       ],
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+                      "id": 857,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1071,
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                       ],
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-                      "src": "3094:7:2",
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+                      "src": "3094:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 809,
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@@ -2064,15 +2064,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3094:59:2",
+                    "src": "3094:59:3",
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                       "typeString": "tuple()"
                     }
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@@ -2080,7 +2080,7 @@
                     "arguments": [
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                         "isConstant": false,
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@@ -2088,31 +2088,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "3167:32:2",
+                        "src": "3167:32:3",
                         "subExpression": {
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                           "baseExpression": {
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-                            "id": 812,
+                            "id": 865,
                             "name": "nullifierHashes",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 664,
-                            "src": "3168:15:2",
+                            "referencedDeclaration": 717,
+                            "src": "3168:15:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
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+                          "id": 867,
                           "indexExpression": {
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+                            "id": 866,
                             "name": "_nullifierHash",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 791,
-                            "src": "3184:14:2",
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                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2123,7 +2123,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "3168:31:2",
+                          "src": "3168:31:3",
                           "typeDescriptions": {
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                             "typeString": "bool"
@@ -2137,14 +2137,14 @@
                       {
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                         "hexValue": "546865206e6f746520686173206265656e20616c7265616479207370656e74",
-                        "id": 816,
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                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3201:33:2",
+                        "src": "3201:33:3",
                         "subdenomination": null,
                         "typeDescriptions": {
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@@ -2164,21 +2164,21 @@
                           "typeString": "literal_string \"The note has been already spent\""
                         }
                       ],
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+                      "id": 864,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1071,
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                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
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@@ -2186,15 +2186,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3159:76:2",
+                    "src": "3159:76:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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-                  "src": "3159:76:2"
+                  "src": "3159:76:3"
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@@ -2205,12 +2205,12 @@
                         "arguments": [
                           {
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-                            "id": 821,
+                            "id": 874,
                             "name": "_root",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 789,
-                            "src": "3261:5:2",
+                            "referencedDeclaration": 842,
+                            "src": "3261:5:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2224,18 +2224,18 @@
                               "typeString": "bytes32"
                             }
                           ],
-                          "id": 820,
+                          "id": 873,
                           "name": "isKnownRoot",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 621,
-                          "src": "3249:11:2",
+                          "referencedDeclaration": 674,
+                          "src": "3249:11:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_bool_$",
                             "typeString": "function (bytes32) view returns (bool)"
                           }
                         },
-                        "id": 822,
+                        "id": 875,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2243,7 +2243,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3249:18:2",
+                        "src": "3249:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2252,14 +2252,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "43616e6e6f742066696e6420796f7572206d65726b6c6520726f6f74",
-                        "id": 823,
+                        "id": 876,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3269:30:2",
+                        "src": "3269:30:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2a69086763073955418d2fd7dfee3d2f1fbc5b21047a216b7855d3f313d8e204",
@@ -2279,21 +2279,21 @@
                           "typeString": "literal_string \"Cannot find your merkle root\""
                         }
                       ],
-                      "id": 819,
+                      "id": 872,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "3241:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "3241:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 824,
+                    "id": 877,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2301,15 +2301,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3241:59:2",
+                    "src": "3241:59:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 825,
+                  "id": 878,
                   "nodeType": "ExpressionStatement",
-                  "src": "3241:59:2"
+                  "src": "3241:59:3"
                 },
                 {
                   "expression": {
@@ -2320,12 +2320,12 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 829,
+                            "id": 882,
                             "name": "_proof",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 787,
-                            "src": "3368:6:2",
+                            "referencedDeclaration": 840,
+                            "src": "3368:6:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes_calldata_ptr",
                               "typeString": "bytes calldata"
@@ -2339,12 +2339,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 831,
+                                    "id": 884,
                                     "name": "_root",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 789,
-                                    "src": "3385:5:2",
+                                    "referencedDeclaration": 842,
+                                    "src": "3385:5:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2358,20 +2358,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
-                                  "id": 830,
+                                  "id": 883,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3377:7:2",
+                                  "src": "3377:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 832,
+                                "id": 885,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2379,7 +2379,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3377:14:2",
+                                "src": "3377:14:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2390,12 +2390,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 834,
+                                    "id": 887,
                                     "name": "_nullifierHash",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 791,
-                                    "src": "3401:14:2",
+                                    "referencedDeclaration": 844,
+                                    "src": "3401:14:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2409,20 +2409,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
-                                  "id": 833,
+                                  "id": 886,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3393:7:2",
+                                  "src": "3393:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 835,
+                                "id": 888,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2430,7 +2430,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3393:23:2",
+                                "src": "3393:23:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2441,12 +2441,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 837,
+                                    "id": 890,
                                     "name": "_recipient",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 793,
-                                    "src": "3426:10:2",
+                                    "referencedDeclaration": 846,
+                                    "src": "3426:10:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -2460,20 +2460,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
-                                  "id": 836,
+                                  "id": 889,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3418:7:2",
+                                  "src": "3418:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 838,
+                                "id": 891,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2481,7 +2481,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3418:19:2",
+                                "src": "3418:19:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2492,12 +2492,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 840,
+                                    "id": 893,
                                     "name": "_relayer",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 795,
-                                    "src": "3447:8:2",
+                                    "referencedDeclaration": 848,
+                                    "src": "3447:8:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -2511,20 +2511,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
-                                  "id": 839,
+                                  "id": 892,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3439:7:2",
+                                  "src": "3439:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 841,
+                                "id": 894,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2532,7 +2532,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3439:17:2",
+                                "src": "3439:17:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2540,12 +2540,12 @@
                               },
                               {
                                 "argumentTypes": null,
-                                "id": 842,
+                                "id": 895,
                                 "name": "_fee",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 797,
-                                "src": "3458:4:2",
+                                "referencedDeclaration": 850,
+                                "src": "3458:4:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2553,26 +2553,26 @@
                               },
                               {
                                 "argumentTypes": null,
-                                "id": 843,
+                                "id": 896,
                                 "name": "_refund",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 799,
-                                "src": "3464:7:2",
+                                "referencedDeclaration": 852,
+                                "src": "3464:7:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
                                 }
                               }
                             ],
-                            "id": 844,
+                            "id": 897,
                             "isConstant": false,
                             "isInlineArray": true,
                             "isLValue": false,
                             "isPure": false,
                             "lValueRequested": false,
                             "nodeType": "TupleExpression",
-                            "src": "3376:96:2",
+                            "src": "3376:96:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_array$_t_uint256_$6_memory_ptr",
                               "typeString": "uint256[6] memory"
@@ -2592,32 +2592,32 @@
                           ],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 827,
+                            "id": 880,
                             "name": "verifier",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 670,
-                            "src": "3347:8:2",
+                            "referencedDeclaration": 723,
+                            "src": "3347:8:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IVerifier_$648",
+                              "typeIdentifier": "t_contract$_IVerifier_$701",
                               "typeString": "contract IVerifier"
                             }
                           },
-                          "id": 828,
+                          "id": 881,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "verifyProof",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 647,
-                          "src": "3347:20:2",
+                          "referencedDeclaration": 700,
+                          "src": "3347:20:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_nonpayable$_t_bytes_memory_ptr_$_t_array$_t_uint256_$6_memory_ptr_$returns$_t_bool_$",
                             "typeString": "function (bytes memory,uint256[6] memory) external returns (bool)"
                           }
                         },
-                        "id": 845,
+                        "id": 898,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2625,7 +2625,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3347:126:2",
+                        "src": "3347:126:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2634,14 +2634,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "496e76616c69642077697468647261772070726f6f66",
-                        "id": 846,
+                        "id": 899,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3475:24:2",
+                        "src": "3475:24:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_7021ea58137dba96e572e94936410b0b0e4cbc344e1ab2ee7f47660768b81ff4",
@@ -2661,21 +2661,21 @@
                           "typeString": "literal_string \"Invalid withdraw proof\""
                         }
                       ],
-                      "id": 826,
+                      "id": 879,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "3339:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "3339:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 847,
+                    "id": 900,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2683,20 +2683,20 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3339:161:2",
+                    "src": "3339:161:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 848,
+                  "id": 901,
                   "nodeType": "ExpressionStatement",
-                  "src": "3339:161:2"
+                  "src": "3339:161:3"
                 },
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 853,
+                    "id": 906,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2705,26 +2705,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 849,
+                        "id": 902,
                         "name": "nullifierHashes",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 664,
-                        "src": "3507:15:2",
+                        "referencedDeclaration": 717,
+                        "src": "3507:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
                       },
-                      "id": 851,
+                      "id": 904,
                       "indexExpression": {
                         "argumentTypes": null,
-                        "id": 850,
+                        "id": 903,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3523:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3523:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2735,7 +2735,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "3507:31:2",
+                      "src": "3507:31:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
@@ -2746,14 +2746,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
-                      "id": 852,
+                      "id": 905,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "3541:4:2",
+                      "src": "3541:4:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
@@ -2761,15 +2761,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "3507:38:2",
+                    "src": "3507:38:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "id": 854,
+                  "id": 907,
                   "nodeType": "ExpressionStatement",
-                  "src": "3507:38:2"
+                  "src": "3507:38:3"
                 },
                 {
                   "expression": {
@@ -2777,12 +2777,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 856,
+                        "id": 909,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3568:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3568:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2790,12 +2790,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 857,
+                        "id": 910,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3580:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3580:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2803,12 +2803,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 858,
+                        "id": 911,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3590:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3590:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -2816,12 +2816,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 859,
+                        "id": 912,
                         "name": "_refund",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 799,
-                        "src": "3596:7:2",
+                        "referencedDeclaration": 852,
+                        "src": "3596:7:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -2834,32 +2834,32 @@
                           "argumentTypes": [],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 860,
+                            "id": 913,
                             "name": "feeManager",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 672,
-                            "src": "3605:10:2",
+                            "referencedDeclaration": 725,
+                            "src": "3605:10:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IFeeManager_$654",
+                              "typeIdentifier": "t_contract$_IFeeManager_$707",
                               "typeString": "contract IFeeManager"
                             }
                           },
-                          "id": 861,
+                          "id": 914,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "feeTo",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 653,
-                          "src": "3605:16:2",
+                          "referencedDeclaration": 706,
+                          "src": "3605:16:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_view$__$returns$_t_address_$",
                             "typeString": "function () view external returns (address)"
                           }
                         },
-                        "id": 862,
+                        "id": 915,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2867,7 +2867,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3605:18:2",
+                        "src": "3605:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -2897,18 +2897,18 @@
                           "typeString": "address"
                         }
                       ],
-                      "id": 855,
+                      "id": 908,
                       "name": "_processWithdraw",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 886,
-                      "src": "3551:16:2",
+                      "referencedDeclaration": 939,
+                      "src": "3551:16:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_payable_$_t_address_payable_$_t_uint256_$_t_uint256_$_t_address_$returns$__$",
                         "typeString": "function (address payable,address payable,uint256,uint256,address)"
                       }
                     },
-                    "id": 863,
+                    "id": 916,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2916,15 +2916,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3551:73:2",
+                    "src": "3551:73:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 864,
+                  "id": 917,
                   "nodeType": "ExpressionStatement",
-                  "src": "3551:73:2"
+                  "src": "3551:73:3"
                 },
                 {
                   "eventCall": {
@@ -2932,12 +2932,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 866,
+                        "id": 919,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3646:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3646:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2945,12 +2945,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 867,
+                        "id": 920,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3658:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3658:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2958,12 +2958,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 868,
+                        "id": 921,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3674:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3674:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2971,12 +2971,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 869,
+                        "id": 922,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3684:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3684:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -3002,18 +3002,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 865,
+                      "id": 918,
                       "name": "Withdrawal",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 704,
-                      "src": "3635:10:2",
+                      "referencedDeclaration": 757,
+                      "src": "3635:10:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_bytes32_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,bytes32,address,uint256)"
                       }
                     },
-                    "id": 870,
+                    "id": 923,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3021,56 +3021,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3635:54:2",
+                    "src": "3635:54:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 871,
+                  "id": 924,
                   "nodeType": "EmitStatement",
-                  "src": "3630:59:2"
+                  "src": "3630:59:3"
                 }
               ]
             },
             "documentation": "@dev Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs\n`input` array consists of:\n- merkle root of all deposits in the contract\n- hash of unique deposit nullifier to prevent double spends\n- the recipient of funds\n- optional fee that goes to the transaction sender (usually a relay)",
-            "id": 873,
+            "id": 926,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 802,
+                "id": 855,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 801,
+                  "id": 854,
                   "name": "nonReentrant",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 999,
-                  "src": "3075:12:2",
+                  "referencedDeclaration": 1052,
+                  "src": "3075:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               }
             ],
             "name": "withdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 800,
+              "id": 853,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 787,
+                  "id": 840,
                   "name": "_proof",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2911:21:2",
+                  "scope": 926,
+                  "src": "2911:21:3",
                   "stateVariable": false,
                   "storageLocation": "calldata",
                   "typeDescriptions": {
@@ -3078,10 +3078,10 @@
                     "typeString": "bytes"
                   },
                   "typeName": {
-                    "id": 786,
+                    "id": 839,
                     "name": "bytes",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2911:5:2",
+                    "src": "2911:5:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes_storage_ptr",
                       "typeString": "bytes"
@@ -3092,11 +3092,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 789,
+                  "id": 842,
                   "name": "_root",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2934:13:2",
+                  "scope": 926,
+                  "src": "2934:13:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3104,10 +3104,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 788,
+                    "id": 841,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2934:7:2",
+                    "src": "2934:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3118,11 +3118,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 791,
+                  "id": 844,
                   "name": "_nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2949:22:2",
+                  "scope": 926,
+                  "src": "2949:22:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3130,10 +3130,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 790,
+                    "id": 843,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2949:7:2",
+                    "src": "2949:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3144,11 +3144,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 793,
+                  "id": 846,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2973:26:2",
+                  "scope": 926,
+                  "src": "2973:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3156,10 +3156,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 792,
+                    "id": 845,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2973:15:2",
+                    "src": "2973:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3171,11 +3171,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 795,
+                  "id": 848,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3001:24:2",
+                  "scope": 926,
+                  "src": "3001:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3183,10 +3183,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 794,
+                    "id": 847,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3001:15:2",
+                    "src": "3001:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3198,11 +3198,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 797,
+                  "id": 850,
                   "name": "_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3027:12:2",
+                  "scope": 926,
+                  "src": "3027:12:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3210,10 +3210,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 796,
+                    "id": 849,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3027:7:2",
+                    "src": "3027:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3224,11 +3224,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 799,
+                  "id": 852,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3041:15:2",
+                  "scope": 926,
+                  "src": "3041:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3236,10 +3236,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 798,
+                    "id": 851,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3041:7:2",
+                    "src": "3041:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3249,16 +3249,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2910:147:2"
+              "src": "2910:147:3"
             },
             "returnParameters": {
-              "id": 803,
+              "id": 856,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "3088:0:2"
+              "src": "3088:0:3"
             },
-            "scope": 970,
-            "src": "2893:801:2",
+            "scope": 1023,
+            "src": "2893:801:3",
             "stateMutability": "payable",
             "superFunction": null,
             "visibility": "external"
@@ -3266,23 +3266,23 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 886,
+            "id": 939,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 884,
+              "id": 937,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 875,
+                  "id": 928,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3783:26:2",
+                  "scope": 939,
+                  "src": "3783:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3290,10 +3290,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 874,
+                    "id": 927,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3783:15:2",
+                    "src": "3783:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3305,11 +3305,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 877,
+                  "id": 930,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3811:24:2",
+                  "scope": 939,
+                  "src": "3811:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3317,10 +3317,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 876,
+                    "id": 929,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3811:15:2",
+                    "src": "3811:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3332,11 +3332,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 879,
+                  "id": 932,
                   "name": "_relayer_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3837:20:2",
+                  "scope": 939,
+                  "src": "3837:20:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3344,10 +3344,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 878,
+                    "id": 931,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3837:7:2",
+                    "src": "3837:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3358,11 +3358,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 881,
+                  "id": 934,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3859:15:2",
+                  "scope": 939,
+                  "src": "3859:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3370,10 +3370,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 880,
+                    "id": 933,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3859:7:2",
+                    "src": "3859:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3384,11 +3384,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 883,
+                  "id": 936,
                   "name": "_feeTo",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3876:14:2",
+                  "scope": 939,
+                  "src": "3876:14:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3396,10 +3396,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 882,
+                    "id": 935,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3876:7:2",
+                    "src": "3876:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -3410,51 +3410,51 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "3782:109:2"
+              "src": "3782:109:3"
             },
             "returnParameters": {
-              "id": 885,
+              "id": 938,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "3900:0:2"
+              "src": "3900:0:3"
             },
-            "scope": 970,
-            "src": "3757:144:2",
+            "scope": 1023,
+            "src": "3757:144:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "internal"
           },
           {
             "body": {
-              "id": 897,
+              "id": 950,
               "nodeType": "Block",
-              "src": "4018:49:2",
+              "src": "4018:49:3",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
                     "baseExpression": {
                       "argumentTypes": null,
-                      "id": 893,
+                      "id": 946,
                       "name": "nullifierHashes",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 664,
-                      "src": "4031:15:2",
+                      "referencedDeclaration": 717,
+                      "src": "4031:15:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                         "typeString": "mapping(bytes32 => bool)"
                       }
                     },
-                    "id": 895,
+                    "id": 948,
                     "indexExpression": {
                       "argumentTypes": null,
-                      "id": 894,
+                      "id": 947,
                       "name": "_nullifierHash",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 888,
-                      "src": "4047:14:2",
+                      "referencedDeclaration": 941,
+                      "src": "4047:14:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bytes32",
                         "typeString": "bytes32"
@@ -3465,37 +3465,37 @@
                     "isPure": false,
                     "lValueRequested": false,
                     "nodeType": "IndexAccess",
-                    "src": "4031:31:2",
+                    "src": "4031:31:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "functionReturnParameters": 892,
-                  "id": 896,
+                  "functionReturnParameters": 945,
+                  "id": 949,
                   "nodeType": "Return",
-                  "src": "4024:38:2"
+                  "src": "4024:38:3"
                 }
               ]
             },
             "documentation": "@dev whether a note is already spent ",
-            "id": 898,
+            "id": 951,
             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "isSpent",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 889,
+              "id": 942,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 888,
+                  "id": 941,
                   "name": "_nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 898,
-                  "src": "3968:22:2",
+                  "scope": 951,
+                  "src": "3968:22:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3503,10 +3503,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 887,
+                    "id": 940,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3968:7:2",
+                    "src": "3968:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3516,19 +3516,19 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "3967:24:2"
+              "src": "3967:24:3"
             },
             "returnParameters": {
-              "id": 892,
+              "id": 945,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 891,
+                  "id": 944,
                   "name": "",
                   "nodeType": "VariableDeclaration",
-                  "scope": 898,
-                  "src": "4012:4:2",
+                  "scope": 951,
+                  "src": "4012:4:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3536,10 +3536,10 @@
                     "typeString": "bool"
                   },
                   "typeName": {
-                    "id": 890,
+                    "id": 943,
                     "name": "bool",
                     "nodeType": "ElementaryTypeName",
-                    "src": "4012:4:2",
+                    "src": "4012:4:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
@@ -3549,36 +3549,36 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "4011:6:2"
+              "src": "4011:6:3"
             },
-            "scope": 970,
-            "src": "3951:116:2",
+            "scope": 1023,
+            "src": "3951:116:3",
             "stateMutability": "view",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 942,
+              "id": 995,
               "nodeType": "Block",
-              "src": "4230:191:2",
+              "src": "4230:191:3",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 914,
+                    "id": 967,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 907,
+                      "id": 960,
                       "name": "spent",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 905,
-                      "src": "4236:5:2",
+                      "referencedDeclaration": 958,
+                      "src": "4236:5:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                         "typeString": "bool[] memory"
@@ -3593,18 +3593,18 @@
                           "argumentTypes": null,
                           "expression": {
                             "argumentTypes": null,
-                            "id": 911,
+                            "id": 964,
                             "name": "_nullifierHashes",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 901,
-                            "src": "4255:16:2",
+                            "referencedDeclaration": 954,
+                            "src": "4255:16:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_array$_t_bytes32_$dyn_calldata_ptr",
                               "typeString": "bytes32[] calldata"
                             }
                           },
-                          "id": 912,
+                          "id": 965,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -3612,7 +3612,7 @@
                           "memberName": "length",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "4255:23:2",
+                          "src": "4255:23:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -3626,39 +3626,39 @@
                             "typeString": "uint256"
                           }
                         ],
-                        "id": 910,
+                        "id": 963,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "lValueRequested": false,
                         "nodeType": "NewExpression",
-                        "src": "4244:10:2",
+                        "src": "4244:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_function_objectcreation_pure$_t_uint256_$returns$_t_array$_t_bool_$dyn_memory_$",
                           "typeString": "function (uint256) pure returns (bool[] memory)"
                         },
                         "typeName": {
                           "baseType": {
-                            "id": 908,
+                            "id": 961,
                             "name": "bool",
                             "nodeType": "ElementaryTypeName",
-                            "src": "4248:4:2",
+                            "src": "4248:4:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bool",
                               "typeString": "bool"
                             }
                           },
-                          "id": 909,
+                          "id": 962,
                           "length": null,
                           "nodeType": "ArrayTypeName",
-                          "src": "4248:6:2",
+                          "src": "4248:6:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_array$_t_bool_$dyn_storage_ptr",
                             "typeString": "bool[]"
                           }
                         }
                       },
-                      "id": 913,
+                      "id": 966,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": false,
@@ -3666,27 +3666,27 @@
                       "lValueRequested": false,
                       "names": [],
                       "nodeType": "FunctionCall",
-                      "src": "4244:35:2",
+                      "src": "4244:35:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_array$_t_bool_$dyn_memory",
                         "typeString": "bool[] memory"
                       }
                     },
-                    "src": "4236:43:2",
+                    "src": "4236:43:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                       "typeString": "bool[] memory"
                     }
                   },
-                  "id": 915,
+                  "id": 968,
                   "nodeType": "ExpressionStatement",
-                  "src": "4236:43:2"
+                  "src": "4236:43:3"
                 },
                 {
                   "body": {
-                    "id": 940,
+                    "id": 993,
                     "nodeType": "Block",
-                    "src": "4335:82:2",
+                    "src": "4335:82:3",
                     "statements": [
                       {
                         "condition": {
@@ -3696,26 +3696,26 @@
                               "argumentTypes": null,
                               "baseExpression": {
                                 "argumentTypes": null,
-                                "id": 928,
+                                "id": 981,
                                 "name": "_nullifierHashes",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 901,
-                                "src": "4355:16:2",
+                                "referencedDeclaration": 954,
+                                "src": "4355:16:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_array$_t_bytes32_$dyn_calldata_ptr",
                                   "typeString": "bytes32[] calldata"
                                 }
                               },
-                              "id": 930,
+                              "id": 983,
                               "indexExpression": {
                                 "argumentTypes": null,
-                                "id": 929,
+                                "id": 982,
                                 "name": "i",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 917,
-                                "src": "4372:1:2",
+                                "referencedDeclaration": 970,
+                                "src": "4372:1:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -3726,7 +3726,7 @@
                               "isPure": false,
                               "lValueRequested": false,
                               "nodeType": "IndexAccess",
-                              "src": "4355:19:2",
+                              "src": "4355:19:3",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_bytes32",
                                 "typeString": "bytes32"
@@ -3740,18 +3740,18 @@
                                 "typeString": "bytes32"
                               }
                             ],
-                            "id": 927,
+                            "id": 980,
                             "name": "isSpent",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 898,
-                            "src": "4347:7:2",
+                            "referencedDeclaration": 951,
+                            "src": "4347:7:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_bool_$",
                               "typeString": "function (bytes32) view returns (bool)"
                             }
                           },
-                          "id": 931,
+                          "id": 984,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -3759,25 +3759,25 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "4347:28:2",
+                          "src": "4347:28:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
                           }
                         },
                         "falseBody": null,
-                        "id": 939,
+                        "id": 992,
                         "nodeType": "IfStatement",
-                        "src": "4343:68:2",
+                        "src": "4343:68:3",
                         "trueBody": {
-                          "id": 938,
+                          "id": 991,
                           "nodeType": "Block",
-                          "src": "4377:34:2",
+                          "src": "4377:34:3",
                           "statements": [
                             {
                               "expression": {
                                 "argumentTypes": null,
-                                "id": 936,
+                                "id": 989,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -3786,26 +3786,26 @@
                                   "argumentTypes": null,
                                   "baseExpression": {
                                     "argumentTypes": null,
-                                    "id": 932,
+                                    "id": 985,
                                     "name": "spent",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 905,
-                                    "src": "4387:5:2",
+                                    "referencedDeclaration": 958,
+                                    "src": "4387:5:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                                       "typeString": "bool[] memory"
                                     }
                                   },
-                                  "id": 934,
+                                  "id": 987,
                                   "indexExpression": {
                                     "argumentTypes": null,
-                                    "id": 933,
+                                    "id": 986,
                                     "name": "i",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 917,
-                                    "src": "4393:1:2",
+                                    "referencedDeclaration": 970,
+                                    "src": "4393:1:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_uint256",
                                       "typeString": "uint256"
@@ -3816,7 +3816,7 @@
                                   "isPure": false,
                                   "lValueRequested": true,
                                   "nodeType": "IndexAccess",
-                                  "src": "4387:8:2",
+                                  "src": "4387:8:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_bool",
                                     "typeString": "bool"
@@ -3827,14 +3827,14 @@
                                 "rightHandSide": {
                                   "argumentTypes": null,
                                   "hexValue": "74727565",
-                                  "id": 935,
+                                  "id": 988,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "kind": "bool",
                                   "lValueRequested": false,
                                   "nodeType": "Literal",
-                                  "src": "4398:4:2",
+                                  "src": "4398:4:3",
                                   "subdenomination": null,
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_bool",
@@ -3842,15 +3842,15 @@
                                   },
                                   "value": "true"
                                 },
-                                "src": "4387:15:2",
+                                "src": "4387:15:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_bool",
                                   "typeString": "bool"
                                 }
                               },
-                              "id": 937,
+                              "id": 990,
                               "nodeType": "ExpressionStatement",
-                              "src": "4387:15:2"
+                              "src": "4387:15:3"
                             }
                           ]
                         }
@@ -3863,19 +3863,19 @@
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
                     },
-                    "id": 923,
+                    "id": 976,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftExpression": {
                       "argumentTypes": null,
-                      "id": 920,
+                      "id": 973,
                       "name": "i",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 917,
-                      "src": "4301:1:2",
+                      "referencedDeclaration": 970,
+                      "src": "4301:1:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -3887,18 +3887,18 @@
                       "argumentTypes": null,
                       "expression": {
                         "argumentTypes": null,
-                        "id": 921,
+                        "id": 974,
                         "name": "_nullifierHashes",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 901,
-                        "src": "4305:16:2",
+                        "referencedDeclaration": 954,
+                        "src": "4305:16:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_array$_t_bytes32_$dyn_calldata_ptr",
                           "typeString": "bytes32[] calldata"
                         }
                       },
-                      "id": 922,
+                      "id": 975,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": false,
@@ -3906,31 +3906,31 @@
                       "memberName": "length",
                       "nodeType": "MemberAccess",
                       "referencedDeclaration": null,
-                      "src": "4305:23:2",
+                      "src": "4305:23:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
                       }
                     },
-                    "src": "4301:27:2",
+                    "src": "4301:27:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "id": 941,
+                  "id": 994,
                   "initializationExpression": {
                     "assignments": [
-                      917
+                      970
                     ],
                     "declarations": [
                       {
                         "constant": false,
-                        "id": 917,
+                        "id": 970,
                         "name": "i",
                         "nodeType": "VariableDeclaration",
-                        "scope": 941,
-                        "src": "4289:6:2",
+                        "scope": 994,
+                        "src": "4289:6:3",
                         "stateVariable": false,
                         "storageLocation": "default",
                         "typeDescriptions": {
@@ -3938,10 +3938,10 @@
                           "typeString": "uint256"
                         },
                         "typeName": {
-                          "id": 916,
+                          "id": 969,
                           "name": "uint",
                           "nodeType": "ElementaryTypeName",
-                          "src": "4289:4:2",
+                          "src": "4289:4:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -3951,18 +3951,18 @@
                         "visibility": "internal"
                       }
                     ],
-                    "id": 919,
+                    "id": 972,
                     "initialValue": {
                       "argumentTypes": null,
                       "hexValue": "30",
-                      "id": 918,
+                      "id": 971,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "4298:1:2",
+                      "src": "4298:1:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_0_by_1",
@@ -3971,12 +3971,12 @@
                       "value": "0"
                     },
                     "nodeType": "VariableDeclarationStatement",
-                    "src": "4289:10:2"
+                    "src": "4289:10:3"
                   },
                   "loopExpression": {
                     "expression": {
                       "argumentTypes": null,
-                      "id": 925,
+                      "id": 978,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": false,
@@ -3984,15 +3984,15 @@
                       "nodeType": "UnaryOperation",
                       "operator": "++",
                       "prefix": false,
-                      "src": "4330:3:2",
+                      "src": "4330:3:3",
                       "subExpression": {
                         "argumentTypes": null,
-                        "id": 924,
+                        "id": 977,
                         "name": "i",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 917,
-                        "src": "4330:1:2",
+                        "referencedDeclaration": 970,
+                        "src": "4330:1:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -4003,33 +4003,33 @@
                         "typeString": "uint256"
                       }
                     },
-                    "id": 926,
+                    "id": 979,
                     "nodeType": "ExpressionStatement",
-                    "src": "4330:3:2"
+                    "src": "4330:3:3"
                   },
                   "nodeType": "ForStatement",
-                  "src": "4285:132:2"
+                  "src": "4285:132:3"
                 }
               ]
             },
             "documentation": "@dev whether an array of notes is already spent ",
-            "id": 943,
+            "id": 996,
             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "isSpentArray",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 902,
+              "id": 955,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 901,
+                  "id": 954,
                   "name": "_nullifierHashes",
                   "nodeType": "VariableDeclaration",
-                  "scope": 943,
-                  "src": "4150:35:2",
+                  "scope": 996,
+                  "src": "4150:35:3",
                   "stateVariable": false,
                   "storageLocation": "calldata",
                   "typeDescriptions": {
@@ -4038,19 +4038,19 @@
                   },
                   "typeName": {
                     "baseType": {
-                      "id": 899,
+                      "id": 952,
                       "name": "bytes32",
                       "nodeType": "ElementaryTypeName",
-                      "src": "4150:7:2",
+                      "src": "4150:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bytes32",
                         "typeString": "bytes32"
                       }
                     },
-                    "id": 900,
+                    "id": 953,
                     "length": null,
                     "nodeType": "ArrayTypeName",
-                    "src": "4150:9:2",
+                    "src": "4150:9:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_bytes32_$dyn_storage_ptr",
                       "typeString": "bytes32[]"
@@ -4060,19 +4060,19 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "4149:37:2"
+              "src": "4149:37:3"
             },
             "returnParameters": {
-              "id": 906,
+              "id": 959,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 905,
+                  "id": 958,
                   "name": "spent",
                   "nodeType": "VariableDeclaration",
-                  "scope": 943,
-                  "src": "4209:19:2",
+                  "scope": 996,
+                  "src": "4209:19:3",
                   "stateVariable": false,
                   "storageLocation": "memory",
                   "typeDescriptions": {
@@ -4081,19 +4081,19 @@
                   },
                   "typeName": {
                     "baseType": {
-                      "id": 903,
+                      "id": 956,
                       "name": "bool",
                       "nodeType": "ElementaryTypeName",
-                      "src": "4209:4:2",
+                      "src": "4209:4:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
                       }
                     },
-                    "id": 904,
+                    "id": 957,
                     "length": null,
                     "nodeType": "ArrayTypeName",
-                    "src": "4209:6:2",
+                    "src": "4209:6:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_bool_$dyn_storage_ptr",
                       "typeString": "bool[]"
@@ -4103,38 +4103,38 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "4208:21:2"
+              "src": "4208:21:3"
             },
-            "scope": 970,
-            "src": "4128:293:2",
+            "scope": 1023,
+            "src": "4128:293:3",
             "stateMutability": "view",
             "superFunction": null,
             "visibility": "external"
           },
           {
             "body": {
-              "id": 956,
+              "id": 1009,
               "nodeType": "Block",
-              "src": "4719:45:2",
+              "src": "4719:45:3",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 954,
+                    "id": 1007,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 950,
+                      "id": 1003,
                       "name": "verifier",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 670,
-                      "src": "4725:8:2",
+                      "referencedDeclaration": 723,
+                      "src": "4725:8:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
@@ -4145,12 +4145,12 @@
                       "arguments": [
                         {
                           "argumentTypes": null,
-                          "id": 952,
+                          "id": 1005,
                           "name": "_newVerifier",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 945,
-                          "src": "4746:12:2",
+                          "referencedDeclaration": 998,
+                          "src": "4746:12:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address",
                             "typeString": "address"
@@ -4164,18 +4164,18 @@
                             "typeString": "address"
                           }
                         ],
-                        "id": 951,
+                        "id": 1004,
                         "name": "IVerifier",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 648,
-                        "src": "4736:9:2",
+                        "referencedDeclaration": 701,
+                        "src": "4736:9:3",
                         "typeDescriptions": {
-                          "typeIdentifier": "t_type$_t_contract$_IVerifier_$648_$",
+                          "typeIdentifier": "t_type$_t_contract$_IVerifier_$701_$",
                           "typeString": "type(contract IVerifier)"
                         }
                       },
-                      "id": 953,
+                      "id": 1006,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": false,
@@ -4183,62 +4183,62 @@
                       "lValueRequested": false,
                       "names": [],
                       "nodeType": "FunctionCall",
-                      "src": "4736:23:2",
+                      "src": "4736:23:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
-                    "src": "4725:34:2",
+                    "src": "4725:34:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
-                  "id": 955,
+                  "id": 1008,
                   "nodeType": "ExpressionStatement",
-                  "src": "4725:34:2"
+                  "src": "4725:34:3"
                 }
               ]
             },
             "documentation": "@dev allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held.\nAfter that operator rights are supposed to be transferred to zero address",
-            "id": 957,
+            "id": 1010,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 948,
+                "id": 1001,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 947,
+                  "id": 1000,
                   "name": "onlyOperator",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 686,
-                  "src": "4706:12:2",
+                  "referencedDeclaration": 739,
+                  "src": "4706:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "4706:12:2"
+                "src": "4706:12:3"
               }
             ],
             "name": "updateVerifier",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 946,
+              "id": 999,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 945,
+                  "id": 998,
                   "name": "_newVerifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 957,
-                  "src": "4675:20:2",
+                  "scope": 1010,
+                  "src": "4675:20:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -4246,10 +4246,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 944,
+                    "id": 997,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "4675:7:2",
+                    "src": "4675:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -4260,42 +4260,42 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "4674:22:2"
+              "src": "4674:22:3"
             },
             "returnParameters": {
-              "id": 949,
+              "id": 1002,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "4719:0:2"
+              "src": "4719:0:3"
             },
-            "scope": 970,
-            "src": "4651:113:2",
+            "scope": 1023,
+            "src": "4651:113:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "external"
           },
           {
             "body": {
-              "id": 968,
+              "id": 1021,
               "nodeType": "Block",
-              "src": "4882:34:2",
+              "src": "4882:34:3",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 966,
+                    "id": 1019,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 964,
+                      "id": 1017,
                       "name": "operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 674,
-                      "src": "4888:8:2",
+                      "referencedDeclaration": 727,
+                      "src": "4888:8:3",
                       "typeDescriptions": {
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                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -5201,21 +5201,21 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 689,
+                        "id": 742,
                         "name": "ElementaryTypeName",
-                        "src": "1004:6:2"
+                        "src": "1004:6:3"
                       }
                     ],
-                    "id": 690,
+                    "id": 743,
                     "name": "VariableDeclaration",
-                    "src": "1004:16:2"
+                    "src": "1004:16:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "timestamp",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5228,24 +5228,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 691,
+                        "id": 744,
                         "name": "ElementaryTypeName",
-                        "src": "1022:7:2"
+                        "src": "1022:7:3"
                       }
                     ],
-                    "id": 692,
+                    "id": 745,
                     "name": "VariableDeclaration",
-                    "src": "1022:17:2"
+                    "src": "1022:17:3"
                   }
                 ],
-                "id": 693,
+                "id": 746,
                 "name": "ParameterList",
-                "src": "975:65:2"
+                "src": "975:65:3"
               }
             ],
-            "id": 694,
+            "id": 747,
             "name": "EventDefinition",
-            "src": "962:79:2"
+            "src": "962:79:3"
           },
           {
             "attributes": {
@@ -5261,7 +5261,7 @@
                       "constant": false,
                       "indexed": false,
                       "name": "to",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5275,21 +5275,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 695,
+                        "id": 748,
                         "name": "ElementaryTypeName",
-                        "src": "1061:7:2"
+                        "src": "1061:7:3"
                       }
                     ],
-                    "id": 696,
+                    "id": 749,
                     "name": "VariableDeclaration",
-                    "src": "1061:10:2"
+                    "src": "1061:10:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "nullifierHash",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5302,21 +5302,21 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 697,
+                        "id": 750,
                         "name": "ElementaryTypeName",
-                        "src": "1073:7:2"
+                        "src": "1073:7:3"
                       }
                     ],
-                    "id": 698,
+                    "id": 751,
                     "name": "VariableDeclaration",
-                    "src": "1073:21:2"
+                    "src": "1073:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": true,
                       "name": "relayer",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5330,21 +5330,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 699,
+                        "id": 752,
                         "name": "ElementaryTypeName",
-                        "src": "1096:7:2"
+                        "src": "1096:7:3"
                       }
                     ],
-                    "id": 700,
+                    "id": 753,
                     "name": "VariableDeclaration",
-                    "src": "1096:23:2"
+                    "src": "1096:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "fee",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5357,24 +5357,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 701,
+                        "id": 754,
                         "name": "ElementaryTypeName",
-                        "src": "1121:7:2"
+                        "src": "1121:7:3"
                       }
                     ],
-                    "id": 702,
+                    "id": 755,
                     "name": "VariableDeclaration",
-                    "src": "1121:11:2"
+                    "src": "1121:11:3"
                   }
                 ],
-                "id": 703,
+                "id": 756,
                 "name": "ParameterList",
-                "src": "1060:73:2"
+                "src": "1060:73:3"
               }
             ],
-            "id": 704,
+            "id": 757,
             "name": "EventDefinition",
-            "src": "1044:90:2"
+            "src": "1044:90:3"
           },
           {
             "attributes": {
@@ -5383,7 +5383,7 @@
               "isConstructor": true,
               "kind": "constructor",
               "name": "",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "public"
@@ -5395,7 +5395,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_verifier",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IVerifier",
@@ -5407,23 +5407,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IVerifier",
-                          "referencedDeclaration": 648,
+                          "referencedDeclaration": 701,
                           "type": "contract IVerifier"
                         },
-                        "id": 705,
+                        "id": 758,
                         "name": "UserDefinedTypeName",
-                        "src": "1450:9:2"
+                        "src": "1450:9:3"
                       }
                     ],
-                    "id": 706,
+                    "id": 759,
                     "name": "VariableDeclaration",
-                    "src": "1450:19:2"
+                    "src": "1450:19:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeManager",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IFeeManager",
@@ -5435,23 +5435,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IFeeManager",
-                          "referencedDeclaration": 654,
+                          "referencedDeclaration": 707,
                           "type": "contract IFeeManager"
                         },
-                        "id": 707,
+                        "id": 760,
                         "name": "UserDefinedTypeName",
-                        "src": "1475:11:2"
+                        "src": "1475:11:3"
                       }
                     ],
-                    "id": 708,
+                    "id": 761,
                     "name": "VariableDeclaration",
-                    "src": "1475:23:2"
+                    "src": "1475:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_denomination",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5464,20 +5464,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 709,
+                        "id": 762,
                         "name": "ElementaryTypeName",
-                        "src": "1504:7:2"
+                        "src": "1504:7:3"
                       }
                     ],
-                    "id": 710,
+                    "id": 763,
                     "name": "VariableDeclaration",
-                    "src": "1504:21:2"
+                    "src": "1504:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_merkleTreeHeight",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -5490,20 +5490,20 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 711,
+                        "id": 764,
                         "name": "ElementaryTypeName",
-                        "src": "1531:6:2"
+                        "src": "1531:6:3"
                       }
                     ],
-                    "id": 712,
+                    "id": 765,
                     "name": "VariableDeclaration",
-                    "src": "1531:24:2"
+                    "src": "1531:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_operator",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5517,19 +5517,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 713,
+                        "id": 766,
                         "name": "ElementaryTypeName",
-                        "src": "1561:7:2"
+                        "src": "1561:7:3"
                       }
                     ],
-                    "id": 714,
+                    "id": 767,
                     "name": "VariableDeclaration",
-                    "src": "1561:17:2"
+                    "src": "1561:17:3"
                   }
                 ],
-                "id": 715,
+                "id": 768,
                 "name": "ParameterList",
-                "src": "1444:138:2"
+                "src": "1444:138:3"
               },
               {
                 "attributes": {
@@ -5538,9 +5538,9 @@
                   ]
                 },
                 "children": [],
-                "id": 719,
+                "id": 772,
                 "name": "ParameterList",
-                "src": "1631:0:2"
+                "src": "1631:0:3"
               },
               {
                 "children": [
@@ -5550,13 +5550,13 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 632,
+                      "referencedDeclaration": 685,
                       "type": "type(contract MerkleTreeWithHistory)",
                       "value": "MerkleTreeWithHistory"
                     },
-                    "id": 716,
+                    "id": 769,
                     "name": "Identifier",
-                    "src": "1583:21:2"
+                    "src": "1583:21:3"
                   },
                   {
                     "attributes": {
@@ -5564,18 +5564,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 712,
+                      "referencedDeclaration": 765,
                       "type": "uint32",
                       "value": "_merkleTreeHeight"
                     },
-                    "id": 717,
+                    "id": 770,
                     "name": "Identifier",
-                    "src": "1605:17:2"
+                    "src": "1605:17:3"
                   }
                 ],
-                "id": 718,
+                "id": 771,
                 "name": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               },
               {
                 "children": [
@@ -5609,16 +5609,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 720,
+                            "id": 773,
                             "name": "Identifier",
-                            "src": "1637:7:2"
+                            "src": "1637:7:3"
                           },
                           {
                             "attributes": {
@@ -5641,13 +5641,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 710,
+                                  "referencedDeclaration": 763,
                                   "type": "uint256",
                                   "value": "_denomination"
                                 },
-                                "id": 721,
+                                "id": 774,
                                 "name": "Identifier",
-                                "src": "1645:13:2"
+                                "src": "1645:13:3"
                               },
                               {
                                 "attributes": {
@@ -5662,14 +5662,14 @@
                                   "type": "int_const 0",
                                   "value": "0"
                                 },
-                                "id": 722,
+                                "id": 775,
                                 "name": "Literal",
-                                "src": "1661:1:2"
+                                "src": "1661:1:3"
                               }
                             ],
-                            "id": 723,
+                            "id": 776,
                             "name": "BinaryOperation",
-                            "src": "1645:17:2"
+                            "src": "1645:17:3"
                           },
                           {
                             "attributes": {
@@ -5684,19 +5684,19 @@
                               "type": "literal_string \"denomination should be greater than 0\"",
                               "value": "denomination should be greater than 0"
                             },
-                            "id": 724,
+                            "id": 777,
                             "name": "Literal",
-                            "src": "1664:39:2"
+                            "src": "1664:39:3"
                           }
                         ],
-                        "id": 725,
+                        "id": 778,
                         "name": "FunctionCall",
-                        "src": "1637:67:2"
+                        "src": "1637:67:3"
                       }
                     ],
-                    "id": 726,
+                    "id": 779,
                     "name": "ExpressionStatement",
-                    "src": "1637:67:2"
+                    "src": "1637:67:3"
                   },
                   {
                     "children": [
@@ -5717,13 +5717,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 670,
+                              "referencedDeclaration": 723,
                               "type": "contract IVerifier",
                               "value": "verifier"
                             },
-                            "id": 727,
+                            "id": 780,
                             "name": "Identifier",
-                            "src": "1710:8:2"
+                            "src": "1710:8:3"
                           },
                           {
                             "attributes": {
@@ -5731,23 +5731,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 706,
+                              "referencedDeclaration": 759,
                               "type": "contract IVerifier",
                               "value": "_verifier"
                             },
-                            "id": 728,
+                            "id": 781,
                             "name": "Identifier",
-                            "src": "1721:9:2"
+                            "src": "1721:9:3"
                           }
                         ],
-                        "id": 729,
+                        "id": 782,
                         "name": "Assignment",
-                        "src": "1710:20:2"
+                        "src": "1710:20:3"
                       }
                     ],
-                    "id": 730,
+                    "id": 783,
                     "name": "ExpressionStatement",
-                    "src": "1710:20:2"
+                    "src": "1710:20:3"
                   },
                   {
                     "children": [
@@ -5768,13 +5768,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 672,
+                              "referencedDeclaration": 725,
                               "type": "contract IFeeManager",
                               "value": "feeManager"
                             },
-                            "id": 731,
+                            "id": 784,
                             "name": "Identifier",
-                            "src": "1736:10:2"
+                            "src": "1736:10:3"
                           },
                           {
                             "attributes": {
@@ -5782,23 +5782,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 708,
+                              "referencedDeclaration": 761,
                               "type": "contract IFeeManager",
                               "value": "_feeManager"
                             },
-                            "id": 732,
+                            "id": 785,
                             "name": "Identifier",
-                            "src": "1749:11:2"
+                            "src": "1749:11:3"
                           }
                         ],
-                        "id": 733,
+                        "id": 786,
                         "name": "Assignment",
-                        "src": "1736:24:2"
+                        "src": "1736:24:3"
                       }
                     ],
-                    "id": 734,
+                    "id": 787,
                     "name": "ExpressionStatement",
-                    "src": "1736:24:2"
+                    "src": "1736:24:3"
                   },
                   {
                     "children": [
@@ -5819,13 +5819,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 674,
+                              "referencedDeclaration": 727,
                               "type": "address",
                               "value": "operator"
                             },
-                            "id": 735,
+                            "id": 788,
                             "name": "Identifier",
-                            "src": "1766:8:2"
+                            "src": "1766:8:3"
                           },
                           {
                             "attributes": {
@@ -5833,23 +5833,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 714,
+                              "referencedDeclaration": 767,
                               "type": "address",
                               "value": "_operator"
                             },
-                            "id": 736,
+                            "id": 789,
                             "name": "Identifier",
-                            "src": "1777:9:2"
+                            "src": "1777:9:3"
                           }
                         ],
-                        "id": 737,
+                        "id": 790,
                         "name": "Assignment",
-                        "src": "1766:20:2"
+                        "src": "1766:20:3"
                       }
                     ],
-                    "id": 738,
+                    "id": 791,
                     "name": "ExpressionStatement",
-                    "src": "1766:20:2"
+                    "src": "1766:20:3"
                   },
                   {
                     "children": [
@@ -5870,13 +5870,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 660,
+                              "referencedDeclaration": 713,
                               "type": "uint256",
                               "value": "denomination"
                             },
-                            "id": 739,
+                            "id": 792,
                             "name": "Identifier",
-                            "src": "1792:12:2"
+                            "src": "1792:12:3"
                           },
                           {
                             "attributes": {
@@ -5884,33 +5884,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 710,
+                              "referencedDeclaration": 763,
                               "type": "uint256",
                               "value": "_denomination"
                             },
-                            "id": 740,
+                            "id": 793,
                             "name": "Identifier",
-                            "src": "1807:13:2"
+                            "src": "1807:13:3"
                           }
                         ],
-                        "id": 741,
+                        "id": 794,
                         "name": "Assignment",
-                        "src": "1792:28:2"
+                        "src": "1792:28:3"
                       }
                     ],
-                    "id": 742,
+                    "id": 795,
                     "name": "ExpressionStatement",
-                    "src": "1792:28:2"
+                    "src": "1792:28:3"
                   }
                 ],
-                "id": 743,
+                "id": 796,
                 "name": "Block",
-                "src": "1631:194:2"
+                "src": "1631:194:3"
               }
             ],
-            "id": 744,
+            "id": 797,
             "name": "FunctionDefinition",
-            "src": "1433:392:2"
+            "src": "1433:392:3"
           },
           {
             "attributes": {
@@ -5919,7 +5919,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "deposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -5931,7 +5931,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_commitment",
-                      "scope": 782,
+                      "scope": 835,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5944,19 +5944,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 745,
+                        "id": 798,
                         "name": "ElementaryTypeName",
-                        "src": "2090:7:2"
+                        "src": "2090:7:3"
                       }
                     ],
-                    "id": 746,
+                    "id": 799,
                     "name": "VariableDeclaration",
-                    "src": "2090:19:2"
+                    "src": "2090:19:3"
                   }
                 ],
-                "id": 747,
+                "id": 800,
                 "name": "ParameterList",
-                "src": "2089:21:2"
+                "src": "2089:21:3"
               },
               {
                 "attributes": {
@@ -5965,9 +5965,9 @@
                   ]
                 },
                 "children": [],
-                "id": 750,
+                "id": 803,
                 "name": "ParameterList",
-                "src": "2141:0:2"
+                "src": "2141:0:3"
               },
               {
                 "attributes": {
@@ -5980,18 +5980,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
-                    "id": 748,
+                    "id": 801,
                     "name": "Identifier",
-                    "src": "2128:12:2"
+                    "src": "2128:12:3"
                   }
                 ],
-                "id": 749,
+                "id": 802,
                 "name": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               },
               {
                 "children": [
@@ -6025,16 +6025,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 751,
+                            "id": 804,
                             "name": "Identifier",
-                            "src": "2147:7:2"
+                            "src": "2147:7:3"
                           },
                           {
                             "attributes": {
@@ -6064,13 +6064,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 668,
+                                      "referencedDeclaration": 721,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "commitments"
                                     },
-                                    "id": 752,
+                                    "id": 805,
                                     "name": "Identifier",
-                                    "src": "2156:11:2"
+                                    "src": "2156:11:3"
                                   },
                                   {
                                     "attributes": {
@@ -6078,23 +6078,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 746,
+                                      "referencedDeclaration": 799,
                                       "type": "bytes32",
                                       "value": "_commitment"
                                     },
-                                    "id": 753,
+                                    "id": 806,
                                     "name": "Identifier",
-                                    "src": "2168:11:2"
+                                    "src": "2168:11:3"
                                   }
                                 ],
-                                "id": 754,
+                                "id": 807,
                                 "name": "IndexAccess",
-                                "src": "2156:24:2"
+                                "src": "2156:24:3"
                               }
                             ],
-                            "id": 755,
+                            "id": 808,
                             "name": "UnaryOperation",
-                            "src": "2155:25:2"
+                            "src": "2155:25:3"
                           },
                           {
                             "attributes": {
@@ -6109,24 +6109,24 @@
                               "type": "literal_string \"The commitment has been submitted\"",
                               "value": "The commitment has been submitted"
                             },
-                            "id": 756,
+                            "id": 809,
                             "name": "Literal",
-                            "src": "2182:35:2"
+                            "src": "2182:35:3"
                           }
                         ],
-                        "id": 757,
+                        "id": 810,
                         "name": "FunctionCall",
-                        "src": "2147:71:2"
+                        "src": "2147:71:3"
                       }
                     ],
-                    "id": 758,
+                    "id": 811,
                     "name": "ExpressionStatement",
-                    "src": "2147:71:2"
+                    "src": "2147:71:3"
                   },
                   {
                     "attributes": {
                       "assignments": [
-                        760
+                        813
                       ]
                     },
                     "children": [
@@ -6134,7 +6134,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "insertedIndex",
-                          "scope": 781,
+                          "scope": 834,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "uint32",
@@ -6147,14 +6147,14 @@
                               "name": "uint32",
                               "type": "uint32"
                             },
-                            "id": 759,
+                            "id": 812,
                             "name": "ElementaryTypeName",
-                            "src": "2225:6:2"
+                            "src": "2225:6:3"
                           }
                         ],
-                        "id": 760,
+                        "id": 813,
                         "name": "VariableDeclaration",
-                        "src": "2225:20:2"
+                        "src": "2225:20:3"
                       },
                       {
                         "attributes": {
@@ -6182,13 +6182,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 574,
+                              "referencedDeclaration": 627,
                               "type": "function (bytes32) returns (uint32)",
                               "value": "_insert"
                             },
-                            "id": 761,
+                            "id": 814,
                             "name": "Identifier",
-                            "src": "2248:7:2"
+                            "src": "2248:7:3"
                           },
                           {
                             "attributes": {
@@ -6196,23 +6196,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 762,
+                            "id": 815,
                             "name": "Identifier",
-                            "src": "2256:11:2"
+                            "src": "2256:11:3"
                           }
                         ],
-                        "id": 763,
+                        "id": 816,
                         "name": "FunctionCall",
-                        "src": "2248:20:2"
+                        "src": "2248:20:3"
                       }
                     ],
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+                    "id": 817,
                     "name": "VariableDeclarationStatement",
-                    "src": "2225:43:2"
+                    "src": "2225:43:3"
                   },
                   {
                     "children": [
@@ -6243,13 +6243,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 668,
+                                  "referencedDeclaration": 721,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "commitments"
                                 },
-                                "id": 765,
+                                "id": 818,
                                 "name": "Identifier",
-                                "src": "2274:11:2"
+                                "src": "2274:11:3"
                               },
                               {
                                 "attributes": {
@@ -6257,18 +6257,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 746,
+                                  "referencedDeclaration": 799,
                                   "type": "bytes32",
                                   "value": "_commitment"
                                 },
-                                "id": 766,
+                                "id": 819,
                                 "name": "Identifier",
-                                "src": "2286:11:2"
+                                "src": "2286:11:3"
                               }
                             ],
-                            "id": 767,
+                            "id": 820,
                             "name": "IndexAccess",
-                            "src": "2274:24:2"
+                            "src": "2274:24:3"
                           },
                           {
                             "attributes": {
@@ -6283,19 +6283,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 768,
+                            "id": 821,
                             "name": "Literal",
-                            "src": "2301:4:2"
+                            "src": "2301:4:3"
                           }
                         ],
-                        "id": 769,
+                        "id": 822,
                         "name": "Assignment",
-                        "src": "2274:31:2"
+                        "src": "2274:31:3"
                       }
                     ],
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+                    "id": 823,
                     "name": "ExpressionStatement",
-                    "src": "2274:31:2"
+                    "src": "2274:31:3"
                   },
                   {
                     "children": [
@@ -6325,23 +6325,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 785,
+                              "referencedDeclaration": 838,
                               "type": "function ()",
                               "value": "_processDeposit"
                             },
-                            "id": 771,
+                            "id": 824,
                             "name": "Identifier",
-                            "src": "2311:15:2"
+                            "src": "2311:15:3"
                           }
                         ],
-                        "id": 772,
+                        "id": 825,
                         "name": "FunctionCall",
-                        "src": "2311:17:2"
+                        "src": "2311:17:3"
                       }
                     ],
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+                    "id": 826,
                     "name": "ExpressionStatement",
-                    "src": "2311:17:2"
+                    "src": "2311:17:3"
                   },
                   {
                     "children": [
@@ -6379,13 +6379,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 694,
+                              "referencedDeclaration": 747,
                               "type": "function (bytes32,uint32,uint256)",
                               "value": "Deposit"
                             },
-                            "id": 774,
+                            "id": 827,
                             "name": "Identifier",
-                            "src": "2340:7:2"
+                            "src": "2340:7:3"
                           },
                           {
                             "attributes": {
@@ -6393,13 +6393,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 775,
+                            "id": 828,
                             "name": "Identifier",
-                            "src": "2348:11:2"
+                            "src": "2348:11:3"
                           },
                           {
                             "attributes": {
@@ -6407,13 +6407,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 760,
+                              "referencedDeclaration": 813,
                               "type": "uint32",
                               "value": "insertedIndex"
                             },
-                            "id": 776,
+                            "id": 829,
                             "name": "Identifier",
-                            "src": "2361:13:2"
+                            "src": "2361:13:3"
                           },
                           {
                             "attributes": {
@@ -6433,38 +6433,38 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 1005,
+                                  "referencedDeclaration": 1058,
                                   "type": "block",
                                   "value": "block"
                                 },
-                                "id": 777,
+                                "id": 830,
                                 "name": "Identifier",
-                                "src": "2376:5:2"
+                                "src": "2376:5:3"
                               }
                             ],
-                            "id": 778,
+                            "id": 831,
                             "name": "MemberAccess",
-                            "src": "2376:15:2"
+                            "src": "2376:15:3"
                           }
                         ],
-                        "id": 779,
+                        "id": 832,
                         "name": "FunctionCall",
-                        "src": "2340:52:2"
+                        "src": "2340:52:3"
                       }
                     ],
-                    "id": 780,
+                    "id": 833,
                     "name": "EmitStatement",
-                    "src": "2335:57:2"
+                    "src": "2335:57:3"
                   }
                 ],
-                "id": 781,
+                "id": 834,
                 "name": "Block",
-                "src": "2141:256:2"
+                "src": "2141:256:3"
               }
             ],
-            "id": 782,
+            "id": 835,
             "name": "FunctionDefinition",
-            "src": "2073:324:2"
+            "src": "2073:324:3"
           },
           {
             "attributes": {
@@ -6477,7 +6477,7 @@
                 null
               ],
               "name": "_processDeposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6490,9 +6490,9 @@
                   ]
                 },
                 "children": [],
-                "id": 783,
+                "id": 836,
                 "name": "ParameterList",
-                "src": "2484:2:2"
+                "src": "2484:2:3"
               },
               {
                 "attributes": {
@@ -6501,14 +6501,14 @@
                   ]
                 },
                 "children": [],
-                "id": 784,
+                "id": 837,
                 "name": "ParameterList",
-                "src": "2495:0:2"
+                "src": "2495:0:3"
               }
             ],
-            "id": 785,
+            "id": 838,
             "name": "FunctionDefinition",
-            "src": "2460:36:2"
+            "src": "2460:36:3"
           },
           {
             "attributes": {
@@ -6517,7 +6517,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "withdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -6529,7 +6529,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_proof",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes",
@@ -6542,20 +6542,20 @@
                           "name": "bytes",
                           "type": "bytes"
                         },
-                        "id": 786,
+                        "id": 839,
                         "name": "ElementaryTypeName",
-                        "src": "2911:5:2"
+                        "src": "2911:5:3"
                       }
                     ],
-                    "id": 787,
+                    "id": 840,
                     "name": "VariableDeclaration",
-                    "src": "2911:21:2"
+                    "src": "2911:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_root",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -6568,20 +6568,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 788,
+                        "id": 841,
                         "name": "ElementaryTypeName",
-                        "src": "2934:7:2"
+                        "src": "2934:7:3"
                       }
                     ],
-                    "id": 789,
+                    "id": 842,
                     "name": "VariableDeclaration",
-                    "src": "2934:13:2"
+                    "src": "2934:13:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -6594,20 +6594,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 790,
+                        "id": 843,
                         "name": "ElementaryTypeName",
-                        "src": "2949:7:2"
+                        "src": "2949:7:3"
                       }
                     ],
-                    "id": 791,
+                    "id": 844,
                     "name": "VariableDeclaration",
-                    "src": "2949:22:2"
+                    "src": "2949:22:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -6621,20 +6621,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 792,
+                        "id": 845,
                         "name": "ElementaryTypeName",
-                        "src": "2973:15:2"
+                        "src": "2973:15:3"
                       }
                     ],
-                    "id": 793,
+                    "id": 846,
                     "name": "VariableDeclaration",
-                    "src": "2973:26:2"
+                    "src": "2973:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -6648,20 +6648,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 794,
+                        "id": 847,
                         "name": "ElementaryTypeName",
-                        "src": "3001:15:2"
+                        "src": "3001:15:3"
                       }
                     ],
-                    "id": 795,
+                    "id": 848,
                     "name": "VariableDeclaration",
-                    "src": "3001:24:2"
+                    "src": "3001:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_fee",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6674,20 +6674,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 796,
+                        "id": 849,
                         "name": "ElementaryTypeName",
-                        "src": "3027:7:2"
+                        "src": "3027:7:3"
                       }
                     ],
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+                    "id": 850,
                     "name": "VariableDeclaration",
-                    "src": "3027:12:2"
+                    "src": "3027:12:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6700,19 +6700,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 798,
+                        "id": 851,
                         "name": "ElementaryTypeName",
-                        "src": "3041:7:2"
+                        "src": "3041:7:3"
                       }
                     ],
-                    "id": 799,
+                    "id": 852,
                     "name": "VariableDeclaration",
-                    "src": "3041:15:2"
+                    "src": "3041:15:3"
                   }
                 ],
-                "id": 800,
+                "id": 853,
                 "name": "ParameterList",
-                "src": "2910:147:2"
+                "src": "2910:147:3"
               },
               {
                 "attributes": {
@@ -6721,9 +6721,9 @@
                   ]
                 },
                 "children": [],
-                "id": 803,
+                "id": 856,
                 "name": "ParameterList",
-                "src": "3088:0:2"
+                "src": "3088:0:3"
               },
               {
                 "attributes": {
@@ -6736,18 +6736,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
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+                    "id": 854,
                     "name": "Identifier",
-                    "src": "3075:12:2"
+                    "src": "3075:12:3"
                   }
                 ],
-                "id": 802,
+                "id": 855,
                 "name": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               },
               {
                 "children": [
@@ -6781,16 +6781,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 804,
+                            "id": 857,
                             "name": "Identifier",
-                            "src": "3094:7:2"
+                            "src": "3094:7:3"
                           },
                           {
                             "attributes": {
@@ -6813,13 +6813,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 797,
+                                  "referencedDeclaration": 850,
                                   "type": "uint256",
                                   "value": "_fee"
                                 },
-                                "id": 805,
+                                "id": 858,
                                 "name": "Identifier",
-                                "src": "3102:4:2"
+                                "src": "3102:4:3"
                               },
                               {
                                 "attributes": {
@@ -6827,18 +6827,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 660,
+                                  "referencedDeclaration": 713,
                                   "type": "uint256",
                                   "value": "denomination"
                                 },
-                                "id": 806,
+                                "id": 859,
                                 "name": "Identifier",
-                                "src": "3110:12:2"
+                                "src": "3110:12:3"
                               }
                             ],
-                            "id": 807,
+                            "id": 860,
                             "name": "BinaryOperation",
-                            "src": "3102:20:2"
+                            "src": "3102:20:3"
                           },
                           {
                             "attributes": {
@@ -6853,19 +6853,19 @@
                               "type": "literal_string \"Fee exceeds transfer value\"",
                               "value": "Fee exceeds transfer value"
                             },
-                            "id": 808,
+                            "id": 861,
                             "name": "Literal",
-                            "src": "3124:28:2"
+                            "src": "3124:28:3"
                           }
                         ],
-                        "id": 809,
+                        "id": 862,
                         "name": "FunctionCall",
-                        "src": "3094:59:2"
+                        "src": "3094:59:3"
                       }
                     ],
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+                    "id": 863,
                     "name": "ExpressionStatement",
-                    "src": "3094:59:2"
+                    "src": "3094:59:3"
                   },
                   {
                     "children": [
@@ -6897,16 +6897,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
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+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 811,
+                            "id": 864,
                             "name": "Identifier",
-                            "src": "3159:7:2"
+                            "src": "3159:7:3"
                           },
                           {
                             "attributes": {
@@ -6936,13 +6936,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 664,
+                                      "referencedDeclaration": 717,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "nullifierHashes"
                                     },
-                                    "id": 812,
+                                    "id": 865,
                                     "name": "Identifier",
-                                    "src": "3168:15:2"
+                                    "src": "3168:15:3"
                                   },
                                   {
                                     "attributes": {
@@ -6950,23 +6950,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 791,
+                                      "referencedDeclaration": 844,
                                       "type": "bytes32",
                                       "value": "_nullifierHash"
                                     },
-                                    "id": 813,
+                                    "id": 866,
                                     "name": "Identifier",
-                                    "src": "3184:14:2"
+                                    "src": "3184:14:3"
                                   }
                                 ],
-                                "id": 814,
+                                "id": 867,
                                 "name": "IndexAccess",
-                                "src": "3168:31:2"
+                                "src": "3168:31:3"
                               }
                             ],
-                            "id": 815,
+                            "id": 868,
                             "name": "UnaryOperation",
-                            "src": "3167:32:2"
+                            "src": "3167:32:3"
                           },
                           {
                             "attributes": {
@@ -6981,19 +6981,19 @@
                               "type": "literal_string \"The note has been already spent\"",
                               "value": "The note has been already spent"
                             },
-                            "id": 816,
+                            "id": 869,
                             "name": "Literal",
-                            "src": "3201:33:2"
+                            "src": "3201:33:3"
                           }
                         ],
-                        "id": 817,
+                        "id": 870,
                         "name": "FunctionCall",
-                        "src": "3159:76:2"
+                        "src": "3159:76:3"
                       }
                     ],
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+                    "id": 871,
                     "name": "ExpressionStatement",
-                    "src": "3159:76:2"
+                    "src": "3159:76:3"
                   },
                   {
                     "children": [
@@ -7025,16 +7025,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
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+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 819,
+                            "id": 872,
                             "name": "Identifier",
-                            "src": "3241:7:2"
+                            "src": "3241:7:3"
                           },
                           {
                             "attributes": {
@@ -7062,13 +7062,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 621,
+                                  "referencedDeclaration": 674,
                                   "type": "function (bytes32) view returns (bool)",
                                   "value": "isKnownRoot"
                                 },
-                                "id": 820,
+                                "id": 873,
                                 "name": "Identifier",
-                                "src": "3249:11:2"
+                                "src": "3249:11:3"
                               },
                               {
                                 "attributes": {
@@ -7076,18 +7076,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 789,
+                                  "referencedDeclaration": 842,
                                   "type": "bytes32",
                                   "value": "_root"
                                 },
-                                "id": 821,
+                                "id": 874,
                                 "name": "Identifier",
-                                "src": "3261:5:2"
+                                "src": "3261:5:3"
                               }
                             ],
-                            "id": 822,
+                            "id": 875,
                             "name": "FunctionCall",
-                            "src": "3249:18:2"
+                            "src": "3249:18:3"
                           },
                           {
                             "attributes": {
@@ -7102,19 +7102,19 @@
                               "type": "literal_string \"Cannot find your merkle root\"",
                               "value": "Cannot find your merkle root"
                             },
-                            "id": 823,
+                            "id": 876,
                             "name": "Literal",
-                            "src": "3269:30:2"
+                            "src": "3269:30:3"
                           }
                         ],
-                        "id": 824,
+                        "id": 877,
                         "name": "FunctionCall",
-                        "src": "3241:59:2"
+                        "src": "3241:59:3"
                       }
                     ],
-                    "id": 825,
+                    "id": 878,
                     "name": "ExpressionStatement",
-                    "src": "3241:59:2"
+                    "src": "3241:59:3"
                   },
                   {
                     "children": [
@@ -7146,16 +7146,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 826,
+                            "id": 879,
                             "name": "Identifier",
-                            "src": "3339:7:2"
+                            "src": "3339:7:3"
                           },
                           {
                             "attributes": {
@@ -7189,7 +7189,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "verifyProof",
-                                  "referencedDeclaration": 647,
+                                  "referencedDeclaration": 700,
                                   "type": "function (bytes memory,uint256[6] memory) external returns (bool)"
                                 },
                                 "children": [
@@ -7199,18 +7199,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 670,
+                                      "referencedDeclaration": 723,
                                       "type": "contract IVerifier",
                                       "value": "verifier"
                                     },
-                                    "id": 827,
+                                    "id": 880,
                                     "name": "Identifier",
-                                    "src": "3347:8:2"
+                                    "src": "3347:8:3"
                                   }
                                 ],
-                                "id": 828,
+                                "id": 881,
                                 "name": "MemberAccess",
-                                "src": "3347:20:2"
+                                "src": "3347:20:3"
                               },
                               {
                                 "attributes": {
@@ -7218,13 +7218,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 787,
+                                  "referencedDeclaration": 840,
                                   "type": "bytes calldata",
                                   "value": "_proof"
                                 },
-                                "id": 829,
+                                "id": 882,
                                 "name": "Identifier",
-                                "src": "3368:6:2"
+                                "src": "3368:6:3"
                               },
                               {
                                 "attributes": {
@@ -7267,9 +7267,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 830,
+                                        "id": 883,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3377:7:2"
+                                        "src": "3377:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7277,18 +7277,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 789,
+                                          "referencedDeclaration": 842,
                                           "type": "bytes32",
                                           "value": "_root"
                                         },
-                                        "id": 831,
+                                        "id": 884,
                                         "name": "Identifier",
-                                        "src": "3385:5:2"
+                                        "src": "3385:5:3"
                                       }
                                     ],
-                                    "id": 832,
+                                    "id": 885,
                                     "name": "FunctionCall",
-                                    "src": "3377:14:2"
+                                    "src": "3377:14:3"
                                   },
                                   {
                                     "attributes": {
@@ -7320,9 +7320,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 833,
+                                        "id": 886,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3393:7:2"
+                                        "src": "3393:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7330,18 +7330,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 791,
+                                          "referencedDeclaration": 844,
                                           "type": "bytes32",
                                           "value": "_nullifierHash"
                                         },
-                                        "id": 834,
+                                        "id": 887,
                                         "name": "Identifier",
-                                        "src": "3401:14:2"
+                                        "src": "3401:14:3"
                                       }
                                     ],
-                                    "id": 835,
+                                    "id": 888,
                                     "name": "FunctionCall",
-                                    "src": "3393:23:2"
+                                    "src": "3393:23:3"
                                   },
                                   {
                                     "attributes": {
@@ -7373,9 +7373,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 836,
+                                        "id": 889,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3418:7:2"
+                                        "src": "3418:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7383,18 +7383,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 793,
+                                          "referencedDeclaration": 846,
                                           "type": "address payable",
                                           "value": "_recipient"
                                         },
-                                        "id": 837,
+                                        "id": 890,
                                         "name": "Identifier",
-                                        "src": "3426:10:2"
+                                        "src": "3426:10:3"
                                       }
                                     ],
-                                    "id": 838,
+                                    "id": 891,
                                     "name": "FunctionCall",
-                                    "src": "3418:19:2"
+                                    "src": "3418:19:3"
                                   },
                                   {
                                     "attributes": {
@@ -7426,9 +7426,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 839,
+                                        "id": 892,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3439:7:2"
+                                        "src": "3439:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7436,18 +7436,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 795,
+                                          "referencedDeclaration": 848,
                                           "type": "address payable",
                                           "value": "_relayer"
                                         },
-                                        "id": 840,
+                                        "id": 893,
                                         "name": "Identifier",
-                                        "src": "3447:8:2"
+                                        "src": "3447:8:3"
                                       }
                                     ],
-                                    "id": 841,
+                                    "id": 894,
                                     "name": "FunctionCall",
-                                    "src": "3439:17:2"
+                                    "src": "3439:17:3"
                                   },
                                   {
                                     "attributes": {
@@ -7455,13 +7455,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 797,
+                                      "referencedDeclaration": 850,
                                       "type": "uint256",
                                       "value": "_fee"
                                     },
-                                    "id": 842,
+                                    "id": 895,
                                     "name": "Identifier",
-                                    "src": "3458:4:2"
+                                    "src": "3458:4:3"
                                   },
                                   {
                                     "attributes": {
@@ -7469,23 +7469,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 799,
+                                      "referencedDeclaration": 852,
                                       "type": "uint256",
                                       "value": "_refund"
                                     },
-                                    "id": 843,
+                                    "id": 896,
                                     "name": "Identifier",
-                                    "src": "3464:7:2"
+                                    "src": "3464:7:3"
                                   }
                                 ],
-                                "id": 844,
+                                "id": 897,
                                 "name": "TupleExpression",
-                                "src": "3376:96:2"
+                                "src": "3376:96:3"
                               }
                             ],
-                            "id": 845,
+                            "id": 898,
                             "name": "FunctionCall",
-                            "src": "3347:126:2"
+                            "src": "3347:126:3"
                           },
                           {
                             "attributes": {
@@ -7500,19 +7500,19 @@
                               "type": "literal_string \"Invalid withdraw proof\"",
                               "value": "Invalid withdraw proof"
                             },
-                            "id": 846,
+                            "id": 899,
                             "name": "Literal",
-                            "src": "3475:24:2"
+                            "src": "3475:24:3"
                           }
                         ],
-                        "id": 847,
+                        "id": 900,
                         "name": "FunctionCall",
-                        "src": "3339:161:2"
+                        "src": "3339:161:3"
                       }
                     ],
-                    "id": 848,
+                    "id": 901,
                     "name": "ExpressionStatement",
-                    "src": "3339:161:2"
+                    "src": "3339:161:3"
                   },
                   {
                     "children": [
@@ -7543,13 +7543,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 664,
+                                  "referencedDeclaration": 717,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "nullifierHashes"
                                 },
-                                "id": 849,
+                                "id": 902,
                                 "name": "Identifier",
-                                "src": "3507:15:2"
+                                "src": "3507:15:3"
                               },
                               {
                                 "attributes": {
@@ -7557,18 +7557,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 791,
+                                  "referencedDeclaration": 844,
                                   "type": "bytes32",
                                   "value": "_nullifierHash"
                                 },
-                                "id": 850,
+                                "id": 903,
                                 "name": "Identifier",
-                                "src": "3523:14:2"
+                                "src": "3523:14:3"
                               }
                             ],
-                            "id": 851,
+                            "id": 904,
                             "name": "IndexAccess",
-                            "src": "3507:31:2"
+                            "src": "3507:31:3"
                           },
                           {
                             "attributes": {
@@ -7583,19 +7583,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 852,
+                            "id": 905,
                             "name": "Literal",
-                            "src": "3541:4:2"
+                            "src": "3541:4:3"
                           }
                         ],
-                        "id": 853,
+                        "id": 906,
                         "name": "Assignment",
-                        "src": "3507:38:2"
+                        "src": "3507:38:3"
                       }
                     ],
-                    "id": 854,
+                    "id": 907,
                     "name": "ExpressionStatement",
-                    "src": "3507:38:2"
+                    "src": "3507:38:3"
                   },
                   {
                     "children": [
@@ -7641,13 +7641,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 886,
+                              "referencedDeclaration": 939,
                               "type": "function (address payable,address payable,uint256,uint256,address)",
                               "value": "_processWithdraw"
                             },
-                            "id": 855,
+                            "id": 908,
                             "name": "Identifier",
-                            "src": "3551:16:2"
+                            "src": "3551:16:3"
                           },
                           {
                             "attributes": {
@@ -7655,13 +7655,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 856,
+                            "id": 909,
                             "name": "Identifier",
-                            "src": "3568:10:2"
+                            "src": "3568:10:3"
                           },
                           {
                             "attributes": {
@@ -7669,13 +7669,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 857,
+                            "id": 910,
                             "name": "Identifier",
-                            "src": "3580:8:2"
+                            "src": "3580:8:3"
                           },
                           {
                             "attributes": {
@@ -7683,13 +7683,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 858,
+                            "id": 911,
                             "name": "Identifier",
-                            "src": "3590:4:2"
+                            "src": "3590:4:3"
                           },
                           {
                             "attributes": {
@@ -7697,13 +7697,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 799,
+                              "referencedDeclaration": 852,
                               "type": "uint256",
                               "value": "_refund"
                             },
-                            "id": 859,
+                            "id": 912,
                             "name": "Identifier",
-                            "src": "3596:7:2"
+                            "src": "3596:7:3"
                           },
                           {
                             "attributes": {
@@ -7733,7 +7733,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "feeTo",
-                                  "referencedDeclaration": 653,
+                                  "referencedDeclaration": 706,
                                   "type": "function () view external returns (address)"
                                 },
                                 "children": [
@@ -7743,33 +7743,33 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 672,
+                                      "referencedDeclaration": 725,
                                       "type": "contract IFeeManager",
                                       "value": "feeManager"
                                     },
-                                    "id": 860,
+                                    "id": 913,
                                     "name": "Identifier",
-                                    "src": "3605:10:2"
+                                    "src": "3605:10:3"
                                   }
                                 ],
-                                "id": 861,
+                                "id": 914,
                                 "name": "MemberAccess",
-                                "src": "3605:16:2"
+                                "src": "3605:16:3"
                               }
                             ],
-                            "id": 862,
+                            "id": 915,
                             "name": "FunctionCall",
-                            "src": "3605:18:2"
+                            "src": "3605:18:3"
                           }
                         ],
-                        "id": 863,
+                        "id": 916,
                         "name": "FunctionCall",
-                        "src": "3551:73:2"
+                        "src": "3551:73:3"
                       }
                     ],
-                    "id": 864,
+                    "id": 917,
                     "name": "ExpressionStatement",
-                    "src": "3551:73:2"
+                    "src": "3551:73:3"
                   },
                   {
                     "children": [
@@ -7811,13 +7811,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 704,
+                              "referencedDeclaration": 757,
                               "type": "function (address,bytes32,address,uint256)",
                               "value": "Withdrawal"
                             },
-                            "id": 865,
+                            "id": 918,
                             "name": "Identifier",
-                            "src": "3635:10:2"
+                            "src": "3635:10:3"
                           },
                           {
                             "attributes": {
@@ -7825,13 +7825,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 866,
+                            "id": 919,
                             "name": "Identifier",
-                            "src": "3646:10:2"
+                            "src": "3646:10:3"
                           },
                           {
                             "attributes": {
@@ -7839,13 +7839,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 791,
+                              "referencedDeclaration": 844,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 867,
+                            "id": 920,
                             "name": "Identifier",
-                            "src": "3658:14:2"
+                            "src": "3658:14:3"
                           },
                           {
                             "attributes": {
@@ -7853,13 +7853,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 868,
+                            "id": 921,
                             "name": "Identifier",
-                            "src": "3674:8:2"
+                            "src": "3674:8:3"
                           },
                           {
                             "attributes": {
@@ -7867,33 +7867,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 869,
+                            "id": 922,
                             "name": "Identifier",
-                            "src": "3684:4:2"
+                            "src": "3684:4:3"
                           }
                         ],
-                        "id": 870,
+                        "id": 923,
                         "name": "FunctionCall",
-                        "src": "3635:54:2"
+                        "src": "3635:54:3"
                       }
                     ],
-                    "id": 871,
+                    "id": 924,
                     "name": "EmitStatement",
-                    "src": "3630:59:2"
+                    "src": "3630:59:3"
                   }
                 ],
-                "id": 872,
+                "id": 925,
                 "name": "Block",
-                "src": "3088:606:2"
+                "src": "3088:606:3"
               }
             ],
-            "id": 873,
+            "id": 926,
             "name": "FunctionDefinition",
-            "src": "2893:801:2"
+            "src": "2893:801:3"
           },
           {
             "attributes": {
@@ -7906,7 +7906,7 @@
                 null
               ],
               "name": "_processWithdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -7918,7 +7918,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7932,20 +7932,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 874,
+                        "id": 927,
                         "name": "ElementaryTypeName",
-                        "src": "3783:15:2"
+                        "src": "3783:15:3"
                       }
                     ],
-                    "id": 875,
+                    "id": 928,
                     "name": "VariableDeclaration",
-                    "src": "3783:26:2"
+                    "src": "3783:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7959,20 +7959,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 876,
+                        "id": 929,
                         "name": "ElementaryTypeName",
-                        "src": "3811:15:2"
+                        "src": "3811:15:3"
                       }
                     ],
-                    "id": 877,
+                    "id": 930,
                     "name": "VariableDeclaration",
-                    "src": "3811:24:2"
+                    "src": "3811:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer_fee",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -7985,20 +7985,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 878,
+                        "id": 931,
                         "name": "ElementaryTypeName",
-                        "src": "3837:7:2"
+                        "src": "3837:7:3"
                       }
                     ],
-                    "id": 879,
+                    "id": 932,
                     "name": "VariableDeclaration",
-                    "src": "3837:20:2"
+                    "src": "3837:20:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -8011,20 +8011,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 880,
+                        "id": 933,
                         "name": "ElementaryTypeName",
-                        "src": "3859:7:2"
+                        "src": "3859:7:3"
                       }
                     ],
-                    "id": 881,
+                    "id": 934,
                     "name": "VariableDeclaration",
-                    "src": "3859:15:2"
+                    "src": "3859:15:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeTo",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -8038,19 +8038,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 882,
+                        "id": 935,
                         "name": "ElementaryTypeName",
-                        "src": "3876:7:2"
+                        "src": "3876:7:3"
                       }
                     ],
-                    "id": 883,
+                    "id": 936,
                     "name": "VariableDeclaration",
-                    "src": "3876:14:2"
+                    "src": "3876:14:3"
                   }
                 ],
-                "id": 884,
+                "id": 937,
                 "name": "ParameterList",
-                "src": "3782:109:2"
+                "src": "3782:109:3"
               },
               {
                 "attributes": {
@@ -8059,14 +8059,14 @@
                   ]
                 },
                 "children": [],
-                "id": 885,
+                "id": 938,
                 "name": "ParameterList",
-                "src": "3900:0:2"
+                "src": "3900:0:3"
               }
             ],
-            "id": 886,
+            "id": 939,
             "name": "FunctionDefinition",
-            "src": "3757:144:2"
+            "src": "3757:144:3"
           },
           {
             "attributes": {
@@ -8078,7 +8078,7 @@
                 null
               ],
               "name": "isSpent",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "public"
@@ -8090,7 +8090,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -8103,19 +8103,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 887,
+                        "id": 940,
                         "name": "ElementaryTypeName",
-                        "src": "3968:7:2"
+                        "src": "3968:7:3"
                       }
                     ],
-                    "id": 888,
+                    "id": 941,
                     "name": "VariableDeclaration",
-                    "src": "3968:22:2"
+                    "src": "3968:22:3"
                   }
                 ],
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+                "id": 942,
                 "name": "ParameterList",
-                "src": "3967:24:2"
+                "src": "3967:24:3"
               },
               {
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@@ -8123,7 +8123,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bool",
@@ -8136,25 +8136,25 @@
                           "name": "bool",
                           "type": "bool"
                         },
-                        "id": 890,
+                        "id": 943,
                         "name": "ElementaryTypeName",
-                        "src": "4012:4:2"
+                        "src": "4012:4:3"
                       }
                     ],
-                    "id": 891,
+                    "id": 944,
                     "name": "VariableDeclaration",
-                    "src": "4012:4:2"
+                    "src": "4012:4:3"
                   }
                 ],
-                "id": 892,
+                "id": 945,
                 "name": "ParameterList",
-                "src": "4011:6:2"
+                "src": "4011:6:3"
               },
               {
                 "children": [
                   {
                     "attributes": {
-                      "functionReturnParameters": 892
+                      "functionReturnParameters": 945
                     },
                     "children": [
                       {
@@ -8173,13 +8173,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 664,
+                              "referencedDeclaration": 717,
                               "type": "mapping(bytes32 => bool)",
                               "value": "nullifierHashes"
                             },
-                            "id": 893,
+                            "id": 946,
                             "name": "Identifier",
-                            "src": "4031:15:2"
+                            "src": "4031:15:3"
                           },
                           {
                             "attributes": {
@@ -8187,33 +8187,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 888,
+                              "referencedDeclaration": 941,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 894,
+                            "id": 947,
                             "name": "Identifier",
-                            "src": "4047:14:2"
+                            "src": "4047:14:3"
                           }
                         ],
-                        "id": 895,
+                        "id": 948,
                         "name": "IndexAccess",
-                        "src": "4031:31:2"
+                        "src": "4031:31:3"
                       }
                     ],
-                    "id": 896,
+                    "id": 949,
                     "name": "Return",
-                    "src": "4024:38:2"
+                    "src": "4024:38:3"
                   }
                 ],
-                "id": 897,
+                "id": 950,
                 "name": "Block",
-                "src": "4018:49:2"
+                "src": "4018:49:3"
               }
             ],
-            "id": 898,
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             "name": "FunctionDefinition",
-            "src": "3951:116:2"
+            "src": "3951:116:3"
           },
           {
             "attributes": {
@@ -8225,7 +8225,7 @@
                 null
               ],
               "name": "isSpentArray",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "external"
@@ -8237,7 +8237,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHashes",
-                      "scope": 943,
+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes32[]",
@@ -8256,24 +8256,24 @@
                               "name": "bytes32",
                               "type": "bytes32"
                             },
-                            "id": 899,
+                            "id": 952,
                             "name": "ElementaryTypeName",
-                            "src": "4150:7:2"
+                            "src": "4150:7:3"
                           }
                         ],
-                        "id": 900,
+                        "id": 953,
                         "name": "ArrayTypeName",
-                        "src": "4150:9:2"
+                        "src": "4150:9:3"
                       }
                     ],
-                    "id": 901,
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                     "name": "VariableDeclaration",
-                    "src": "4150:35:2"
+                    "src": "4150:35:3"
                   }
                 ],
-                "id": 902,
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                 "name": "ParameterList",
-                "src": "4149:37:2"
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@@ -8281,7 +8281,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "spent",
-                      "scope": 943,
+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "memory",
                       "type": "bool[]",
@@ -8300,24 +8300,24 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 903,
+                            "id": 956,
                             "name": "ElementaryTypeName",
-                            "src": "4209:4:2"
+                            "src": "4209:4:3"
                           }
                         ],
-                        "id": 904,
+                        "id": 957,
                         "name": "ArrayTypeName",
-                        "src": "4209:6:2"
+                        "src": "4209:6:3"
                       }
                     ],
-                    "id": 905,
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                     "name": "VariableDeclaration",
-                    "src": "4209:19:2"
+                    "src": "4209:19:3"
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                 ],
-                "id": 906,
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                 "name": "ParameterList",
-                "src": "4208:21:2"
+                "src": "4208:21:3"
               },
               {
                 "children": [
@@ -8340,13 +8340,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 905,
+                              "referencedDeclaration": 958,
                               "type": "bool[] memory",
                               "value": "spent"
                             },
-                            "id": 907,
+                            "id": 960,
                             "name": "Identifier",
-                            "src": "4236:5:2"
+                            "src": "4236:5:3"
                           },
                           {
                             "attributes": {
@@ -8389,19 +8389,19 @@
                                           "name": "bool",
                                           "type": "bool"
                                         },
-                                        "id": 908,
+                                        "id": 961,
                                         "name": "ElementaryTypeName",
-                                        "src": "4248:4:2"
+                                        "src": "4248:4:3"
                                       }
                                     ],
-                                    "id": 909,
+                                    "id": 962,
                                     "name": "ArrayTypeName",
-                                    "src": "4248:6:2"
+                                    "src": "4248:6:3"
                                   }
                                 ],
-                                "id": 910,
+                                "id": 963,
                                 "name": "NewExpression",
-                                "src": "4244:10:2"
+                                "src": "4244:10:3"
                               },
                               {
                                 "attributes": {
@@ -8421,40 +8421,40 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 901,
+                                      "referencedDeclaration": 954,
                                       "type": "bytes32[] calldata",
                                       "value": "_nullifierHashes"
                                     },
-                                    "id": 911,
+                                    "id": 964,
                                     "name": "Identifier",
-                                    "src": "4255:16:2"
+                                    "src": "4255:16:3"
                                   }
                                 ],
-                                "id": 912,
+                                "id": 965,
                                 "name": "MemberAccess",
-                                "src": "4255:23:2"
+                                "src": "4255:23:3"
                               }
                             ],
-                            "id": 913,
+                            "id": 966,
                             "name": "FunctionCall",
-                            "src": "4244:35:2"
+                            "src": "4244:35:3"
                           }
                         ],
-                        "id": 914,
+                        "id": 967,
                         "name": "Assignment",
-                        "src": "4236:43:2"
+                        "src": "4236:43:3"
                       }
                     ],
-                    "id": 915,
+                    "id": 968,
                     "name": "ExpressionStatement",
-                    "src": "4236:43:2"
+                    "src": "4236:43:3"
                   },
                   {
                     "children": [
                       {
                         "attributes": {
                           "assignments": [
-                            917
+                            970
                           ]
                         },
                         "children": [
@@ -8462,7 +8462,7 @@
                             "attributes": {
                               "constant": false,
                               "name": "i",
-                              "scope": 941,
+                              "scope": 994,
                               "stateVariable": false,
                               "storageLocation": "default",
                               "type": "uint256",
@@ -8475,14 +8475,14 @@
                                   "name": "uint",
                                   "type": "uint256"
                                 },
-                                "id": 916,
+                                "id": 969,
                                 "name": "ElementaryTypeName",
-                                "src": "4289:4:2"
+                                "src": "4289:4:3"
                               }
                             ],
-                            "id": 917,
+                            "id": 970,
                             "name": "VariableDeclaration",
-                            "src": "4289:6:2"
+                            "src": "4289:6:3"
                           },
                           {
                             "attributes": {
@@ -8497,14 +8497,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 918,
+                            "id": 971,
                             "name": "Literal",
-                            "src": "4298:1:2"
+                            "src": "4298:1:3"
                           }
                         ],
-                        "id": 919,
+                        "id": 972,
                         "name": "VariableDeclarationStatement",
-                        "src": "4289:10:2"
+                        "src": "4289:10:3"
                       },
                       {
                         "attributes": {
@@ -8527,13 +8527,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 917,
+                              "referencedDeclaration": 970,
                               "type": "uint256",
                               "value": "i"
                             },
-                            "id": 920,
+                            "id": 973,
                             "name": "Identifier",
-                            "src": "4301:1:2"
+                            "src": "4301:1:3"
                           },
                           {
                             "attributes": {
@@ -8553,23 +8553,23 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 901,
+                                  "referencedDeclaration": 954,
                                   "type": "bytes32[] calldata",
                                   "value": "_nullifierHashes"
                                 },
-                                "id": 921,
+                                "id": 974,
                                 "name": "Identifier",
-                                "src": "4305:16:2"
+                                "src": "4305:16:3"
                               }
                             ],
-                            "id": 922,
+                            "id": 975,
                             "name": "MemberAccess",
-                            "src": "4305:23:2"
+                            "src": "4305:23:3"
                           }
                         ],
-                        "id": 923,
+                        "id": 976,
                         "name": "BinaryOperation",
-                        "src": "4301:27:2"
+                        "src": "4301:27:3"
                       },
                       {
                         "children": [
@@ -8591,23 +8591,23 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 917,
+                                  "referencedDeclaration": 970,
                                   "type": "uint256",
                                   "value": "i"
                                 },
-                                "id": 924,
+                                "id": 977,
                                 "name": "Identifier",
-                                "src": "4330:1:2"
+                                "src": "4330:1:3"
                               }
                             ],
-                            "id": 925,
+                            "id": 978,
                             "name": "UnaryOperation",
-                            "src": "4330:3:2"
+                            "src": "4330:3:3"
                           }
                         ],
-                        "id": 926,
+                        "id": 979,
                         "name": "ExpressionStatement",
-                        "src": "4330:3:2"
+                        "src": "4330:3:3"
                       },
                       {
                         "children": [
@@ -8642,13 +8642,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 898,
+                                      "referencedDeclaration": 951,
                                       "type": "function (bytes32) view returns (bool)",
                                       "value": "isSpent"
                                     },
-                                    "id": 927,
+                                    "id": 980,
                                     "name": "Identifier",
-                                    "src": "4347:7:2"
+                                    "src": "4347:7:3"
                                   },
                                   {
                                     "attributes": {
@@ -8666,13 +8666,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 901,
+                                          "referencedDeclaration": 954,
                                           "type": "bytes32[] calldata",
                                           "value": "_nullifierHashes"
                                         },
-                                        "id": 928,
+                                        "id": 981,
                                         "name": "Identifier",
-                                        "src": "4355:16:2"
+                                        "src": "4355:16:3"
                                       },
                                       {
                                         "attributes": {
@@ -8680,23 +8680,23 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 917,
+                                          "referencedDeclaration": 970,
                                           "type": "uint256",
                                           "value": "i"
                                         },
-                                        "id": 929,
+                                        "id": 982,
                                         "name": "Identifier",
-                                        "src": "4372:1:2"
+                                        "src": "4372:1:3"
                                       }
                                     ],
-                                    "id": 930,
+                                    "id": 983,
                                     "name": "IndexAccess",
-                                    "src": "4355:19:2"
+                                    "src": "4355:19:3"
                                   }
                                 ],
-                                "id": 931,
+                                "id": 984,
                                 "name": "FunctionCall",
-                                "src": "4347:28:2"
+                                "src": "4347:28:3"
                               },
                               {
                                 "children": [
@@ -8729,13 +8729,13 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 905,
+                                                  "referencedDeclaration": 958,
                                                   "type": "bool[] memory",
                                                   "value": "spent"
                                                 },
-                                                "id": 932,
+                                                "id": 985,
                                                 "name": "Identifier",
-                                                "src": "4387:5:2"
+                                                "src": "4387:5:3"
                                               },
                                               {
                                                 "attributes": {
@@ -8743,18 +8743,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 917,
+                                                  "referencedDeclaration": 970,
                                                   "type": "uint256",
                                                   "value": "i"
                                                 },
-                                                "id": 933,
+                                                "id": 986,
                                                 "name": "Identifier",
-                                                "src": "4393:1:2"
+                                                "src": "4393:1:3"
                                               }
                                             ],
-                                            "id": 934,
+                                            "id": 987,
                                             "name": "IndexAccess",
-                                            "src": "4387:8:2"
+                                            "src": "4387:8:3"
                                           },
                                           {
                                             "attributes": {
@@ -8769,49 +8769,49 @@
                                               "type": "bool",
                                               "value": "true"
                                             },
-                                            "id": 935,
+                                            "id": 988,
                                             "name": "Literal",
-                                            "src": "4398:4:2"
+                                            "src": "4398:4:3"
                                           }
                                         ],
-                                        "id": 936,
+                                        "id": 989,
                                         "name": "Assignment",
-                                        "src": "4387:15:2"
+                                        "src": "4387:15:3"
                                       }
                                     ],
-                                    "id": 937,
+                                    "id": 990,
                                     "name": "ExpressionStatement",
-                                    "src": "4387:15:2"
+                                    "src": "4387:15:3"
                                   }
                                 ],
-                                "id": 938,
+                                "id": 991,
                                 "name": "Block",
-                                "src": "4377:34:2"
+                                "src": "4377:34:3"
                               }
                             ],
-                            "id": 939,
+                            "id": 992,
                             "name": "IfStatement",
-                            "src": "4343:68:2"
+                            "src": "4343:68:3"
                           }
                         ],
-                        "id": 940,
+                        "id": 993,
                         "name": "Block",
-                        "src": "4335:82:2"
+                        "src": "4335:82:3"
                       }
                     ],
-                    "id": 941,
+                    "id": 994,
                     "name": "ForStatement",
-                    "src": "4285:132:2"
+                    "src": "4285:132:3"
                   }
                 ],
-                "id": 942,
+                "id": 995,
                 "name": "Block",
-                "src": "4230:191:2"
+                "src": "4230:191:3"
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             ],
-            "id": 943,
+            "id": 996,
             "name": "FunctionDefinition",
-            "src": "4128:293:2"
+            "src": "4128:293:3"
           },
           {
             "attributes": {
@@ -8820,7 +8820,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "updateVerifier",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "external"
@@ -8832,7 +8832,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_newVerifier",
-                      "scope": 957,
+                      "scope": 1010,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -8846,19 +8846,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 944,
+                        "id": 997,
                         "name": "ElementaryTypeName",
-                        "src": "4675:7:2"
+                        "src": "4675:7:3"
                       }
                     ],
-                    "id": 945,
+                    "id": 998,
                     "name": "VariableDeclaration",
-                    "src": "4675:20:2"
+                    "src": "4675:20:3"
                   }
                 ],
-                "id": 946,
+                "id": 999,
                 "name": "ParameterList",
-                "src": "4674:22:2"
+                "src": "4674:22:3"
               },
               {
                 "attributes": {
@@ -8867,9 +8867,9 @@
                   ]
                 },
                 "children": [],
-                "id": 949,
+                "id": 1002,
                 "name": "ParameterList",
-                "src": "4719:0:2"
+                "src": "4719:0:3"
               },
               {
                 "attributes": {
@@ -8882,18 +8882,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 686,
+                      "referencedDeclaration": 739,
                       "type": "modifier ()",
                       "value": "onlyOperator"
                     },
-                    "id": 947,
+                    "id": 1000,
                     "name": "Identifier",
-                    "src": "4706:12:2"
+                    "src": "4706:12:3"
                   }
                 ],
-                "id": 948,
+                "id": 1001,
                 "name": "ModifierInvocation",
-                "src": "4706:12:2"
+                "src": "4706:12:3"
               },
               {
                 "children": [
@@ -8916,13 +8916,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 670,
+                              "referencedDeclaration": 723,
                               "type": "contract IVerifier",
                               "value": "verifier"
                             },
-                            "id": 950,
+                            "id": 1003,
                             "name": "Identifier",
-                            "src": "4725:8:2"
+                            "src": "4725:8:3"
                           },
                           {
                             "attributes": {
@@ -8950,13 +8950,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 648,
+                                  "referencedDeclaration": 701,
                                   "type": "type(contract IVerifier)",
                                   "value": "IVerifier"
                                 },
-                                "id": 951,
+                                "id": 1004,
                                 "name": "Identifier",
-                                "src": "4736:9:2"
+                                "src": "4736:9:3"
                               },
                               {
                                 "attributes": {
@@ -8964,38 +8964,38 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 945,
+                                  "referencedDeclaration": 998,
                                   "type": "address",
                                   "value": "_newVerifier"
                                 },
-                                "id": 952,
+                                "id": 1005,
                                 "name": "Identifier",
-                                "src": "4746:12:2"
+                                "src": "4746:12:3"
                               }
                             ],
-                            "id": 953,
+                            "id": 1006,
                             "name": "FunctionCall",
-                            "src": "4736:23:2"
+                            "src": "4736:23:3"
                           }
                         ],
-                        "id": 954,
+                        "id": 1007,
                         "name": "Assignment",
-                        "src": "4725:34:2"
+                        "src": "4725:34:3"
                       }
                     ],
-                    "id": 955,
+                    "id": 1008,
                     "name": "ExpressionStatement",
-                    "src": "4725:34:2"
+                    "src": "4725:34:3"
                   }
                 ],
-                "id": 956,
+                "id": 1009,
                 "name": "Block",
-                "src": "4719:45:2"
+                "src": "4719:45:3"
               }
             ],
-            "id": 957,
+            "id": 1010,
             "name": "FunctionDefinition",
-            "src": "4651:113:2"
+            "src": "4651:113:3"
           },
           {
             "attributes": {
@@ -9004,7 +9004,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "changeOperator",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "external"
@@ -9016,7 +9016,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_newOperator",
-                      "scope": 969,
+                      "scope": 1022,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -9030,19 +9030,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 958,
+                        "id": 1011,
                         "name": "ElementaryTypeName",
-                        "src": "4838:7:2"
+                        "src": "4838:7:3"
                       }
                     ],
-                    "id": 959,
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                     "name": "VariableDeclaration",
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+                    "src": "4838:20:3"
                   }
                 ],
-                "id": 960,
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                 "name": "ParameterList",
-                "src": "4837:22:2"
+                "src": "4837:22:3"
               },
               {
                 "attributes": {
@@ -9051,9 +9051,9 @@
                   ]
                 },
                 "children": [],
-                "id": 963,
+                "id": 1016,
                 "name": "ParameterList",
-                "src": "4882:0:2"
+                "src": "4882:0:3"
               },
               {
                 "attributes": {
@@ -9066,18 +9066,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 686,
+                      "referencedDeclaration": 739,
                       "type": "modifier ()",
                       "value": "onlyOperator"
                     },
-                    "id": 961,
+                    "id": 1014,
                     "name": "Identifier",
-                    "src": "4869:12:2"
+                    "src": "4869:12:3"
                   }
                 ],
-                "id": 962,
+                "id": 1015,
                 "name": "ModifierInvocation",
-                "src": "4869:12:2"
+                "src": "4869:12:3"
               },
               {
                 "children": [
@@ -9100,13 +9100,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 674,
+                              "referencedDeclaration": 727,
                               "type": "address",
                               "value": "operator"
                             },
-                            "id": 964,
+                            "id": 1017,
                             "name": "Identifier",
-                            "src": "4888:8:2"
+                            "src": "4888:8:3"
                           },
                           {
                             "attributes": {
@@ -9114,43 +9114,43 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 959,
+                              "referencedDeclaration": 1012,
                               "type": "address",
                               "value": "_newOperator"
                             },
-                            "id": 965,
+                            "id": 1018,
                             "name": "Identifier",
-                            "src": "4899:12:2"
+                            "src": "4899:12:3"
                           }
                         ],
-                        "id": 966,
+                        "id": 1019,
                         "name": "Assignment",
-                        "src": "4888:23:2"
+                        "src": "4888:23:3"
                       }
                     ],
-                    "id": 967,
+                    "id": 1020,
                     "name": "ExpressionStatement",
-                    "src": "4888:23:2"
+                    "src": "4888:23:3"
                   }
                 ],
-                "id": 968,
+                "id": 1021,
                 "name": "Block",
-                "src": "4882:34:2"
+                "src": "4882:34:3"
               }
             ],
-            "id": 969,
+            "id": 1022,
             "name": "FunctionDefinition",
-            "src": "4814:102:2"
+            "src": "4814:102:3"
           }
         ],
-        "id": 970,
+        "id": 1023,
         "name": "ContractDefinition",
-        "src": "318:4600:2"
+        "src": "318:4600:3"
       }
     ],
-    "id": 971,
+    "id": 1024,
     "name": "SourceUnit",
-    "src": "0:4919:2"
+    "src": "0:4919:3"
   },
   "compiler": {
     "name": "solc",
@@ -9158,7 +9158,7 @@
   },
   "networks": {},
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T22:21:29.527Z",
+  "updatedAt": "2021-04-02T22:52:06.027Z",
   "devdoc": {
     "methods": {}
   },
diff --git a/client/contracts/IVerifier.json b/client/contracts/IVerifier.json
index a93acee..3fca8e6 100644
--- a/client/contracts/IVerifier.json
+++ b/client/contracts/IVerifier.json
@@ -39,47 +39,47 @@
     "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/Tornado.sol",
     "exportedSymbols": {
       "IFeeManager": [
-        654
+        707
       ],
       "IVerifier": [
-        648
+        701
       ],
       "Tornado": [
-        970
+        1023
       ]
     },
-    "id": 971,
+    "id": 1024,
     "nodeType": "SourceUnit",
     "nodes": [
       {
-        "id": 634,
+        "id": 687,
         "literals": [
           "solidity",
           "0.5",
           ".17"
         ],
         "nodeType": "PragmaDirective",
-        "src": "0:23:2"
+        "src": "0:23:3"
       },
       {
         "absolutePath": "/Users/brianli/dotfiles/tornado-core/contracts/MerkleTreeWithHistory.sol",
         "file": "./MerkleTreeWithHistory.sol",
-        "id": 635,
+        "id": 688,
         "nodeType": "ImportDirective",
-        "scope": 971,
-        "sourceUnit": 633,
-        "src": "25:37:2",
+        "scope": 1024,
+        "sourceUnit": 686,
+        "src": "25:37:3",
         "symbolAliases": [],
         "unitAlias": ""
       },
       {
         "absolutePath": "@openzeppelin/contracts/utils/ReentrancyGuard.sol",
         "file": "@openzeppelin/contracts/utils/ReentrancyGuard.sol",
-        "id": 636,
+        "id": 689,
         "nodeType": "ImportDirective",
-        "scope": 971,
-        "sourceUnit": 1001,
-        "src": "63:59:2",
+        "scope": 1024,
+        "sourceUnit": 1054,
+        "src": "63:59:3",
         "symbolAliases": [],
         "unitAlias": ""
       },
@@ -89,9 +89,9 @@
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": false,
-        "id": 648,
+        "id": 701,
         "linearizedBaseContracts": [
-          648
+          701
         ],
         "name": "IVerifier",
         "nodeType": "ContractDefinition",
@@ -99,23 +99,23 @@
           {
             "body": null,
             "documentation": null,
-            "id": 647,
+            "id": 700,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "verifyProof",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 643,
+              "id": 696,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 638,
+                  "id": 691,
                   "name": "_proof",
                   "nodeType": "VariableDeclaration",
-                  "scope": 647,
-                  "src": "168:19:2",
+                  "scope": 700,
+                  "src": "168:19:3",
                   "stateVariable": false,
                   "storageLocation": "memory",
                   "typeDescriptions": {
@@ -123,10 +123,10 @@
                     "typeString": "bytes"
                   },
                   "typeName": {
-                    "id": 637,
+                    "id": 690,
                     "name": "bytes",
                     "nodeType": "ElementaryTypeName",
-                    "src": "168:5:2",
+                    "src": "168:5:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes_storage_ptr",
                       "typeString": "bytes"
@@ -137,11 +137,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 642,
+                  "id": 695,
                   "name": "_input",
                   "nodeType": "VariableDeclaration",
-                  "scope": 647,
-                  "src": "189:24:2",
+                  "scope": 700,
+                  "src": "189:24:3",
                   "stateVariable": false,
                   "storageLocation": "memory",
                   "typeDescriptions": {
@@ -150,27 +150,27 @@
                   },
                   "typeName": {
                     "baseType": {
-                      "id": 639,
+                      "id": 692,
                       "name": "uint256",
                       "nodeType": "ElementaryTypeName",
-                      "src": "189:7:2",
+                      "src": "189:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
                       }
                     },
-                    "id": 641,
+                    "id": 694,
                     "length": {
                       "argumentTypes": null,
                       "hexValue": "36",
-                      "id": 640,
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                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "number",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "197:1:2",
+                      "src": "197:1:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_rational_6_by_1",
@@ -179,7 +179,7 @@
                       "value": "6"
                     },
                     "nodeType": "ArrayTypeName",
-                    "src": "189:10:2",
+                    "src": "189:10:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_uint256_$6_storage_ptr",
                       "typeString": "uint256[6]"
@@ -189,19 +189,19 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "167:47:2"
+              "src": "167:47:3"
             },
             "returnParameters": {
-              "id": 646,
+              "id": 699,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 645,
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                   "name": "",
                   "nodeType": "VariableDeclaration",
-                  "scope": 647,
-                  "src": "230:4:2",
+                  "scope": 700,
+                  "src": "230:4:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -209,10 +209,10 @@
                     "typeString": "bool"
                   },
                   "typeName": {
-                    "id": 644,
+                    "id": 697,
                     "name": "bool",
                     "nodeType": "ElementaryTypeName",
-                    "src": "230:4:2",
+                    "src": "230:4:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
@@ -222,17 +222,17 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "229:6:2"
+              "src": "229:6:3"
             },
-            "scope": 648,
-            "src": "147:89:2",
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+            "src": "147:89:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           }
         ],
-        "scope": 971,
-        "src": "124:114:2"
+        "scope": 1024,
+        "src": "124:114:3"
       },
       {
         "baseContracts": [],
@@ -240,9 +240,9 @@
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": false,
-        "id": 654,
+        "id": 707,
         "linearizedBaseContracts": [
-          654
+          707
         ],
         "name": "IFeeManager",
         "nodeType": "ContractDefinition",
@@ -250,29 +250,29 @@
           {
             "body": null,
             "documentation": null,
-            "id": 653,
+            "id": 706,
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             "kind": "function",
             "modifiers": [],
             "name": "feeTo",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 649,
+              "id": 702,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "279:2:2"
+              "src": "279:2:3"
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             "returnParameters": {
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                   "constant": false,
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+                  "id": 704,
                   "name": "",
                   "nodeType": "VariableDeclaration",
-                  "scope": 653,
-                  "src": "305:7:2",
+                  "scope": 706,
+                  "src": "305:7:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -280,10 +280,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 650,
+                    "id": 703,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "305:7:2",
+                    "src": "305:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -294,17 +294,17 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "304:9:2"
+              "src": "304:9:3"
             },
-            "scope": 654,
-            "src": "265:49:2",
+            "scope": 707,
+            "src": "265:49:3",
             "stateMutability": "view",
             "superFunction": null,
             "visibility": "external"
           }
         ],
-        "scope": 971,
-        "src": "240:76:2"
+        "scope": 1024,
+        "src": "240:76:3"
       },
       {
         "baseContracts": [
@@ -312,62 +312,62 @@
             "arguments": null,
             "baseName": {
               "contractScope": null,
-              "id": 655,
+              "id": 708,
               "name": "MerkleTreeWithHistory",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 632,
-              "src": "338:21:2",
+              "referencedDeclaration": 685,
+              "src": "338:21:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_MerkleTreeWithHistory_$632",
+                "typeIdentifier": "t_contract$_MerkleTreeWithHistory_$685",
                 "typeString": "contract MerkleTreeWithHistory"
               }
             },
-            "id": 656,
+            "id": 709,
             "nodeType": "InheritanceSpecifier",
-            "src": "338:21:2"
+            "src": "338:21:3"
           },
           {
             "arguments": null,
             "baseName": {
               "contractScope": null,
-              "id": 657,
+              "id": 710,
               "name": "ReentrancyGuard",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 1000,
-              "src": "361:15:2",
+              "referencedDeclaration": 1053,
+              "src": "361:15:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_ReentrancyGuard_$1000",
+                "typeIdentifier": "t_contract$_ReentrancyGuard_$1053",
                 "typeString": "contract ReentrancyGuard"
               }
             },
-            "id": 658,
+            "id": 711,
             "nodeType": "InheritanceSpecifier",
-            "src": "361:15:2"
+            "src": "361:15:3"
           }
         ],
         "contractDependencies": [
-          632,
-          1000
+          685,
+          1053
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": false,
-        "id": 970,
+        "id": 1023,
         "linearizedBaseContracts": [
-          970,
-          1000,
-          632
+          1023,
+          1053,
+          685
         ],
         "name": "Tornado",
         "nodeType": "ContractDefinition",
         "nodes": [
           {
             "constant": false,
-            "id": 660,
+            "id": 713,
             "name": "denomination",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "381:27:2",
+            "scope": 1023,
+            "src": "381:27:3",
             "stateVariable": true,
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@@ -375,10 +375,10 @@
               "typeString": "uint256"
             },
             "typeName": {
-              "id": 659,
+              "id": 712,
               "name": "uint256",
               "nodeType": "ElementaryTypeName",
-              "src": "381:7:2",
+              "src": "381:7:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_uint256",
                 "typeString": "uint256"
@@ -389,11 +389,11 @@
           },
           {
             "constant": false,
-            "id": 664,
+            "id": 717,
             "name": "nullifierHashes",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "412:47:2",
+            "scope": 1023,
+            "src": "412:47:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
@@ -401,28 +401,28 @@
               "typeString": "mapping(bytes32 => bool)"
             },
             "typeName": {
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+              "id": 716,
               "keyType": {
-                "id": 661,
+                "id": 714,
                 "name": "bytes32",
                 "nodeType": "ElementaryTypeName",
-                "src": "420:7:2",
+                "src": "420:7:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "412:24:2",
+              "src": "412:24:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                 "typeString": "mapping(bytes32 => bool)"
               },
               "valueType": {
-                "id": 662,
+                "id": 715,
                 "name": "bool",
                 "nodeType": "ElementaryTypeName",
-                "src": "431:4:2",
+                "src": "431:4:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bool",
                   "typeString": "bool"
@@ -434,11 +434,11 @@
           },
           {
             "constant": false,
-            "id": 668,
+            "id": 721,
             "name": "commitments",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "554:43:2",
+            "scope": 1023,
+            "src": "554:43:3",
             "stateVariable": true,
             "storageLocation": "default",
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@@ -446,28 +446,28 @@
               "typeString": "mapping(bytes32 => bool)"
             },
             "typeName": {
-              "id": 667,
+              "id": 720,
               "keyType": {
-                "id": 665,
+                "id": 718,
                 "name": "bytes32",
                 "nodeType": "ElementaryTypeName",
-                "src": "562:7:2",
+                "src": "562:7:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "554:24:2",
+              "src": "554:24:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                 "typeString": "mapping(bytes32 => bool)"
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                 "nodeType": "ElementaryTypeName",
-                "src": "573:4:2",
+                "src": "573:4:3",
                 "typeDescriptions": {
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                   "typeString": "bool"
@@ -479,26 +479,26 @@
           },
           {
             "constant": false,
-            "id": 670,
+            "id": 723,
             "name": "verifier",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "601:25:2",
+            "scope": 1023,
+            "src": "601:25:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IVerifier_$648",
+              "typeIdentifier": "t_contract$_IVerifier_$701",
               "typeString": "contract IVerifier"
             },
             "typeName": {
               "contractScope": null,
-              "id": 669,
+              "id": 722,
               "name": "IVerifier",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 648,
-              "src": "601:9:2",
+              "referencedDeclaration": 701,
+              "src": "601:9:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IVerifier_$648",
+                "typeIdentifier": "t_contract$_IVerifier_$701",
                 "typeString": "contract IVerifier"
               }
             },
@@ -507,26 +507,26 @@
           },
           {
             "constant": false,
-            "id": 672,
+            "id": 725,
             "name": "feeManager",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "630:29:2",
+            "scope": 1023,
+            "src": "630:29:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IFeeManager_$654",
+              "typeIdentifier": "t_contract$_IFeeManager_$707",
               "typeString": "contract IFeeManager"
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-              "id": 671,
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               "name": "IFeeManager",
               "nodeType": "UserDefinedTypeName",
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-              "src": "630:11:2",
+              "referencedDeclaration": 707,
+              "src": "630:11:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IFeeManager_$654",
+                "typeIdentifier": "t_contract$_IFeeManager_$707",
                 "typeString": "contract IFeeManager"
               }
             },
@@ -535,11 +535,11 @@
           },
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             "constant": false,
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+            "id": 727,
             "name": "operator",
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-            "scope": 970,
-            "src": "819:23:2",
+            "scope": 1023,
+            "src": "819:23:3",
             "stateVariable": true,
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@@ -547,10 +547,10 @@
               "typeString": "address"
             },
             "typeName": {
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+              "id": 726,
               "name": "address",
               "nodeType": "ElementaryTypeName",
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+              "src": "819:7:3",
               "stateMutability": "nonpayable",
               "typeDescriptions": {
                 "typeIdentifier": "t_address",
@@ -562,9 +562,9 @@
           },
           {
             "body": {
-              "id": 685,
+              "id": 738,
               "nodeType": "Block",
-              "src": "868:90:2",
+              "src": "868:90:3",
               "statements": [
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@@ -576,7 +576,7 @@
                           "typeIdentifier": "t_address",
                           "typeString": "address"
                         },
-                        "id": 680,
+                        "id": 733,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -585,18 +585,18 @@
                           "argumentTypes": null,
                           "expression": {
                             "argumentTypes": null,
-                            "id": 677,
+                            "id": 730,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 1015,
-                            "src": "882:3:2",
+                            "referencedDeclaration": 1068,
+                            "src": "882:3:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
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                           },
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@@ -604,7 +604,7 @@
                           "memberName": "sender",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "882:10:2",
+                          "src": "882:10:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address_payable",
                             "typeString": "address payable"
@@ -614,18 +614,18 @@
                         "operator": "==",
                         "rightExpression": {
                           "argumentTypes": null,
-                          "id": 679,
+                          "id": 732,
                           "name": "operator",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 674,
-                          "src": "896:8:2",
+                          "referencedDeclaration": 727,
+                          "src": "896:8:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address",
                             "typeString": "address"
                           }
                         },
-                        "src": "882:22:2",
+                        "src": "882:22:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -634,14 +634,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4f6e6c79206f70657261746f722063616e2063616c6c20746869732066756e6374696f6e2e",
-                        "id": 681,
+                        "id": 734,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "906:39:2",
+                        "src": "906:39:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_e8393660073679be7a6133571fe2ca8983a31a683c72e9055f401ac33a2efffc",
@@ -661,21 +661,21 @@
                           "typeString": "literal_string \"Only operator can call this function.\""
                         }
                       ],
-                      "id": 676,
+                      "id": 729,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "874:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "874:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 682,
+                    "id": 735,
                     "isConstant": false,
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                     "isPure": false,
@@ -683,54 +683,54 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "874:72:2",
+                    "src": "874:72:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 683,
+                  "id": 736,
                   "nodeType": "ExpressionStatement",
-                  "src": "874:72:2"
+                  "src": "874:72:3"
                 },
                 {
-                  "id": 684,
+                  "id": 737,
                   "nodeType": "PlaceholderStatement",
-                  "src": "952:1:2"
+                  "src": "952:1:3"
                 }
               ]
             },
             "documentation": null,
-            "id": 686,
+            "id": 739,
             "name": "onlyOperator",
             "nodeType": "ModifierDefinition",
             "parameters": {
-              "id": 675,
+              "id": 728,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "868:0:2"
+              "src": "868:0:3"
             },
-            "src": "846:112:2",
+            "src": "846:112:3",
             "visibility": "internal"
           },
           {
             "anonymous": false,
             "documentation": null,
-            "id": 694,
+            "id": 747,
             "name": "Deposit",
             "nodeType": "EventDefinition",
             "parameters": {
-              "id": 693,
+              "id": 746,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 688,
+                  "id": 741,
                   "indexed": true,
                   "name": "commitment",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "976:26:2",
+                  "scope": 747,
+                  "src": "976:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -738,10 +738,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 687,
+                    "id": 740,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "976:7:2",
+                    "src": "976:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -752,12 +752,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 690,
+                  "id": 743,
                   "indexed": false,
                   "name": "leafIndex",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "1004:16:2",
+                  "scope": 747,
+                  "src": "1004:16:3",
                   "stateVariable": false,
                   "storageLocation": "default",
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@@ -765,10 +765,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 689,
+                    "id": 742,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1004:6:2",
+                    "src": "1004:6:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -779,12 +779,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 692,
+                  "id": 745,
                   "indexed": false,
                   "name": "timestamp",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "1022:17:2",
+                  "scope": 747,
+                  "src": "1022:17:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -792,10 +792,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 691,
+                    "id": 744,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1022:7:2",
+                    "src": "1022:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -805,28 +805,28 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "975:65:2"
+              "src": "975:65:3"
             },
-            "src": "962:79:2"
+            "src": "962:79:3"
           },
           {
             "anonymous": false,
             "documentation": null,
-            "id": 704,
+            "id": 757,
             "name": "Withdrawal",
             "nodeType": "EventDefinition",
             "parameters": {
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+              "id": 756,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 696,
+                  "id": 749,
                   "indexed": false,
                   "name": "to",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1061:10:2",
+                  "scope": 757,
+                  "src": "1061:10:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -834,10 +834,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 695,
+                    "id": 748,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1061:7:2",
+                    "src": "1061:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -849,12 +849,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 698,
+                  "id": 751,
                   "indexed": false,
                   "name": "nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1073:21:2",
+                  "scope": 757,
+                  "src": "1073:21:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -862,10 +862,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 697,
+                    "id": 750,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1073:7:2",
+                    "src": "1073:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -876,12 +876,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 700,
+                  "id": 753,
                   "indexed": true,
                   "name": "relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1096:23:2",
+                  "scope": 757,
+                  "src": "1096:23:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -889,10 +889,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 699,
+                    "id": 752,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1096:7:2",
+                    "src": "1096:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -904,12 +904,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 702,
+                  "id": 755,
                   "indexed": false,
                   "name": "fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1121:11:2",
+                  "scope": 757,
+                  "src": "1121:11:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -917,10 +917,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 701,
+                    "id": 754,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1121:7:2",
+                    "src": "1121:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -930,15 +930,15 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1060:73:2"
+              "src": "1060:73:3"
             },
-            "src": "1044:90:2"
+            "src": "1044:90:3"
           },
           {
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+              "id": 796,
               "nodeType": "Block",
-              "src": "1631:194:2",
+              "src": "1631:194:3",
               "statements": [
                 {
                   "expression": {
@@ -950,19 +950,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 723,
+                        "id": 776,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
-                          "id": 721,
+                          "id": 774,
                           "name": "_denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 710,
-                          "src": "1645:13:2",
+                          "referencedDeclaration": 763,
+                          "src": "1645:13:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -973,14 +973,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 722,
+                          "id": 775,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1661:1:2",
+                          "src": "1661:1:3",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -988,7 +988,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1645:17:2",
+                        "src": "1645:17:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -997,14 +997,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "64656e6f6d696e6174696f6e2073686f756c642062652067726561746572207468616e2030",
-                        "id": 724,
+                        "id": 777,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1664:39:2",
+                        "src": "1664:39:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_04818fb803bf7e7ff6c9059d97eae335b77b108931ead0a529924d35ccaf3fc8",
@@ -1024,21 +1024,21 @@
                           "typeString": "literal_string \"denomination should be greater than 0\""
                         }
                       ],
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+                      "id": 773,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "1637:7:2",
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                         "typeString": "function (bool,string memory) pure"
                       }
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                     "isConstant": false,
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@@ -1046,34 +1046,34 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1637:67:2",
+                    "src": "1637:67:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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                     "lValueRequested": false,
                     "leftHandSide": {
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+                      "id": 780,
                       "name": "verifier",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 670,
-                      "src": "1710:8:2",
+                      "referencedDeclaration": 723,
+                      "src": "1710:8:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
@@ -1081,45 +1081,45 @@
                     "operator": "=",
                     "rightHandSide": {
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-                      "id": 728,
+                      "id": 781,
                       "name": "_verifier",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 706,
-                      "src": "1721:9:2",
+                      "referencedDeclaration": 759,
+                      "src": "1721:9:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
-                    "src": "1710:20:2",
+                    "src": "1710:20:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
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+                  "id": 783,
                   "nodeType": "ExpressionStatement",
-                  "src": "1710:20:2"
+                  "src": "1710:20:3"
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+                    "id": 786,
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                     "leftHandSide": {
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+                      "id": 784,
                       "name": "feeManager",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 672,
-                      "src": "1736:10:2",
+                      "referencedDeclaration": 725,
+                      "src": "1736:10:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
@@ -1127,43 +1127,43 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 732,
+                      "id": 785,
                       "name": "_feeManager",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 708,
-                      "src": "1749:11:2",
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+                      "src": "1749:11:3",
                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
-                    "src": "1736:24:2",
+                    "src": "1736:24:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
                     }
                   },
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                   "nodeType": "ExpressionStatement",
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+                  "src": "1736:24:3"
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                     "leftHandSide": {
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                       "name": "operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 674,
-                      "src": "1766:8:2",
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+                      "src": "1766:8:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -1173,43 +1173,43 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 736,
+                      "id": 789,
                       "name": "_operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 714,
-                      "src": "1777:9:2",
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+                      "src": "1777:9:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1766:20:2",
+                    "src": "1766:20:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
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+                  "id": 791,
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+                  "src": "1766:20:3"
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                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 739,
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                       "name": "denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 660,
-                      "src": "1792:12:2",
+                      "referencedDeclaration": 713,
+                      "src": "1792:12:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1219,31 +1219,31 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 740,
+                      "id": 793,
                       "name": "_denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 710,
-                      "src": "1807:13:2",
+                      "referencedDeclaration": 763,
+                      "src": "1807:13:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
                       }
                     },
-                    "src": "1792:28:2",
+                    "src": "1792:28:3",
                     "typeDescriptions": {
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                       "typeString": "uint256"
                     }
                   },
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+                  "id": 795,
                   "nodeType": "ExpressionStatement",
-                  "src": "1792:28:2"
+                  "src": "1792:28:3"
                 }
               ]
             },
             "documentation": "@dev The constructor\n@param _verifier the address of SNARK verifier for this contract\n@param _denomination transfer amount for each deposit\n@param _merkleTreeHeight the height of deposits' Merkle Tree\n@param _operator operator address (see operator comment above)",
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+            "id": 797,
             "implemented": true,
             "kind": "constructor",
             "modifiers": [
@@ -1251,64 +1251,64 @@
                 "arguments": [
                   {
                     "argumentTypes": null,
-                    "id": 717,
+                    "id": 770,
                     "name": "_merkleTreeHeight",
                     "nodeType": "Identifier",
                     "overloadedDeclarations": [],
-                    "referencedDeclaration": 712,
-                    "src": "1605:17:2",
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+                    "src": "1605:17:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
                     }
                   }
                 ],
-                "id": 718,
+                "id": 771,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 716,
+                  "id": 769,
                   "name": "MerkleTreeWithHistory",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 632,
-                  "src": "1583:21:2",
+                  "referencedDeclaration": 685,
+                  "src": "1583:21:3",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$632_$",
+                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$685_$",
                     "typeString": "type(contract MerkleTreeWithHistory)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               }
             ],
             "name": "",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 715,
+              "id": 768,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 706,
+                  "id": 759,
                   "name": "_verifier",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1450:19:2",
+                  "scope": 797,
+                  "src": "1450:19:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$648",
+                    "typeIdentifier": "t_contract$_IVerifier_$701",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 705,
+                    "id": 758,
                     "name": "IVerifier",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 648,
-                    "src": "1450:9:2",
+                    "referencedDeclaration": 701,
+                    "src": "1450:9:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
                   },
@@ -1317,26 +1317,26 @@
                 },
                 {
                   "constant": false,
-                  "id": 708,
+                  "id": 761,
                   "name": "_feeManager",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1475:23:2",
+                  "scope": 797,
+                  "src": "1475:23:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeIdentifier": "t_contract$_IFeeManager_$707",
                     "typeString": "contract IFeeManager"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 707,
+                    "id": 760,
                     "name": "IFeeManager",
                     "nodeType": "UserDefinedTypeName",
-                    "referencedDeclaration": 654,
-                    "src": "1475:11:2",
+                    "referencedDeclaration": 707,
+                    "src": "1475:11:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
                     }
                   },
@@ -1345,11 +1345,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 710,
+                  "id": 763,
                   "name": "_denomination",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1504:21:2",
+                  "scope": 797,
+                  "src": "1504:21:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1357,10 +1357,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 709,
+                    "id": 762,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1504:7:2",
+                    "src": "1504:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -1371,11 +1371,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 712,
+                  "id": 765,
                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1531:24:2",
+                  "scope": 797,
+                  "src": "1531:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1383,10 +1383,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 711,
+                    "id": 764,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1531:6:2",
+                    "src": "1531:6:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -1397,11 +1397,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 714,
+                  "id": 767,
                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
-                  "scope": 744,
-                  "src": "1561:17:2",
+                  "scope": 797,
+                  "src": "1561:17:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1409,10 +1409,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 713,
+                    "id": 766,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1561:7:2",
+                    "src": "1561:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -1423,25 +1423,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1444:138:2"
+              "src": "1444:138:3"
             },
             "returnParameters": {
-              "id": 719,
+              "id": 772,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1631:0:2"
+              "src": "1631:0:3"
             },
-            "scope": 970,
-            "src": "1433:392:2",
+            "scope": 1023,
+            "src": "1433:392:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 781,
+              "id": 834,
               "nodeType": "Block",
-              "src": "2141:256:2",
+              "src": "2141:256:3",
               "statements": [
                 {
                   "expression": {
@@ -1449,7 +1449,7 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 755,
+                        "id": 808,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -1457,31 +1457,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "2155:25:2",
+                        "src": "2155:25:3",
                         "subExpression": {
                           "argumentTypes": null,
                           "baseExpression": {
                             "argumentTypes": null,
-                            "id": 752,
+                            "id": 805,
                             "name": "commitments",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 668,
-                            "src": "2156:11:2",
+                            "referencedDeclaration": 721,
+                            "src": "2156:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
-                          "id": 754,
+                          "id": 807,
                           "indexExpression": {
                             "argumentTypes": null,
-                            "id": 753,
+                            "id": 806,
                             "name": "_commitment",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 746,
-                            "src": "2168:11:2",
+                            "referencedDeclaration": 799,
+                            "src": "2168:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -1492,7 +1492,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "2156:24:2",
+                          "src": "2156:24:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
@@ -1506,14 +1506,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "54686520636f6d6d69746d656e7420686173206265656e207375626d6974746564",
-                        "id": 756,
+                        "id": 809,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "2182:35:2",
+                        "src": "2182:35:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_ae5f231636554c1cb3bf839359e4dfbb338ccb221c7c5dbdf2da91ddc6e2ee6b",
@@ -1533,21 +1533,21 @@
                           "typeString": "literal_string \"The commitment has been submitted\""
                         }
                       ],
-                      "id": 751,
+                      "id": 804,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "2147:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "2147:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 757,
+                    "id": 810,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -1555,28 +1555,28 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2147:71:2",
+                    "src": "2147:71:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 758,
+                  "id": 811,
                   "nodeType": "ExpressionStatement",
-                  "src": "2147:71:2"
+                  "src": "2147:71:3"
                 },
                 {
                   "assignments": [
-                    760
+                    813
                   ],
                   "declarations": [
                     {
                       "constant": false,
-                      "id": 760,
+                      "id": 813,
                       "name": "insertedIndex",
                       "nodeType": "VariableDeclaration",
-                      "scope": 781,
-                      "src": "2225:20:2",
+                      "scope": 834,
+                      "src": "2225:20:3",
                       "stateVariable": false,
                       "storageLocation": "default",
                       "typeDescriptions": {
@@ -1584,10 +1584,10 @@
                         "typeString": "uint32"
                       },
                       "typeName": {
-                        "id": 759,
+                        "id": 812,
                         "name": "uint32",
                         "nodeType": "ElementaryTypeName",
-                        "src": "2225:6:2",
+                        "src": "2225:6:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint32",
                           "typeString": "uint32"
@@ -1597,18 +1597,18 @@
                       "visibility": "internal"
                     }
                   ],
-                  "id": 764,
+                  "id": 817,
                   "initialValue": {
                     "argumentTypes": null,
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 762,
+                        "id": 815,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2256:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2256:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1622,18 +1622,18 @@
                           "typeString": "bytes32"
                         }
                       ],
-                      "id": 761,
+                      "id": 814,
                       "name": "_insert",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 574,
-                      "src": "2248:7:2",
+                      "referencedDeclaration": 627,
+                      "src": "2248:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_bytes32_$returns$_t_uint32_$",
                         "typeString": "function (bytes32) returns (uint32)"
                       }
                     },
-                    "id": 763,
+                    "id": 816,
                     "isConstant": false,
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                     "isPure": false,
@@ -1641,19 +1641,19 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2248:20:2",
+                    "src": "2248:20:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
                     }
                   },
                   "nodeType": "VariableDeclarationStatement",
-                  "src": "2225:43:2"
+                  "src": "2225:43:3"
                 },
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 769,
+                    "id": 822,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -1662,26 +1662,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 765,
+                        "id": 818,
                         "name": "commitments",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 668,
-                        "src": "2274:11:2",
+                        "referencedDeclaration": 721,
+                        "src": "2274:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
                       },
-                      "id": 767,
+                      "id": 820,
                       "indexExpression": {
                         "argumentTypes": null,
-                        "id": 766,
+                        "id": 819,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2286:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2286:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1692,7 +1692,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "2274:24:2",
+                      "src": "2274:24:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
@@ -1703,14 +1703,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
-                      "id": 768,
+                      "id": 821,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "2301:4:2",
+                      "src": "2301:4:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
@@ -1718,15 +1718,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "2274:31:2",
+                    "src": "2274:31:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "id": 770,
+                  "id": 823,
                   "nodeType": "ExpressionStatement",
-                  "src": "2274:31:2"
+                  "src": "2274:31:3"
                 },
                 {
                   "expression": {
@@ -1734,18 +1734,18 @@
                     "arguments": [],
                     "expression": {
                       "argumentTypes": [],
-                      "id": 771,
+                      "id": 824,
                       "name": "_processDeposit",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 785,
-                      "src": "2311:15:2",
+                      "referencedDeclaration": 838,
+                      "src": "2311:15:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$__$returns$__$",
                         "typeString": "function ()"
                       }
                     },
-                    "id": 772,
+                    "id": 825,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -1753,15 +1753,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2311:17:2",
+                    "src": "2311:17:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 773,
+                  "id": 826,
                   "nodeType": "ExpressionStatement",
-                  "src": "2311:17:2"
+                  "src": "2311:17:3"
                 },
                 {
                   "eventCall": {
@@ -1769,12 +1769,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 775,
+                        "id": 828,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2348:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2348:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -1782,12 +1782,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 776,
+                        "id": 829,
                         "name": "insertedIndex",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 760,
-                        "src": "2361:13:2",
+                        "referencedDeclaration": 813,
+                        "src": "2361:13:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint32",
                           "typeString": "uint32"
@@ -1797,18 +1797,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 777,
+                          "id": 830,
                           "name": "block",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 1005,
-                          "src": "2376:5:2",
+                          "referencedDeclaration": 1058,
+                          "src": "2376:5:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_block",
                             "typeString": "block"
                           }
                         },
-                        "id": 778,
+                        "id": 831,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -1816,7 +1816,7 @@
                         "memberName": "timestamp",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "2376:15:2",
+                        "src": "2376:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -1838,18 +1838,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 774,
+                      "id": 827,
                       "name": "Deposit",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 694,
-                      "src": "2340:7:2",
+                      "referencedDeclaration": 747,
+                      "src": "2340:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_bytes32_$_t_uint32_$_t_uint256_$returns$__$",
                         "typeString": "function (bytes32,uint32,uint256)"
                       }
                     },
-                    "id": 779,
+                    "id": 832,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -1857,56 +1857,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2340:52:2",
+                    "src": "2340:52:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 780,
+                  "id": 833,
                   "nodeType": "EmitStatement",
-                  "src": "2335:57:2"
+                  "src": "2335:57:3"
                 }
               ]
             },
             "documentation": "@dev Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\n@param _commitment the note commitment, which is PedersenHash(nullifier + secret)",
-            "id": 782,
+            "id": 835,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 749,
+                "id": 802,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 748,
+                  "id": 801,
                   "name": "nonReentrant",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 999,
-                  "src": "2128:12:2",
+                  "referencedDeclaration": 1052,
+                  "src": "2128:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               }
             ],
             "name": "deposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 747,
+              "id": 800,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 746,
+                  "id": 799,
                   "name": "_commitment",
                   "nodeType": "VariableDeclaration",
-                  "scope": 782,
-                  "src": "2090:19:2",
+                  "scope": 835,
+                  "src": "2090:19:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1914,10 +1914,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 745,
+                    "id": 798,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2090:7:2",
+                    "src": "2090:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -1927,16 +1927,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2089:21:2"
+              "src": "2089:21:3"
             },
             "returnParameters": {
-              "id": 750,
+              "id": 803,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "2141:0:2"
+              "src": "2141:0:3"
             },
-            "scope": 970,
-            "src": "2073:324:2",
+            "scope": 1023,
+            "src": "2073:324:3",
             "stateMutability": "payable",
             "superFunction": null,
             "visibility": "external"
@@ -1944,35 +1944,35 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 785,
+            "id": 838,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 783,
+              "id": 836,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "2484:2:2"
+              "src": "2484:2:3"
             },
             "returnParameters": {
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+              "id": 837,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "2495:0:2"
+              "src": "2495:0:3"
             },
-            "scope": 970,
-            "src": "2460:36:2",
+            "scope": 1023,
+            "src": "2460:36:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "internal"
           },
           {
             "body": {
-              "id": 872,
+              "id": 925,
               "nodeType": "Block",
-              "src": "3088:606:2",
+              "src": "3088:606:3",
               "statements": [
                 {
                   "expression": {
@@ -1984,19 +1984,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 807,
+                        "id": 860,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
-                          "id": 805,
+                          "id": 858,
                           "name": "_fee",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 797,
-                          "src": "3102:4:2",
+                          "referencedDeclaration": 850,
+                          "src": "3102:4:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -2006,18 +2006,18 @@
                         "operator": "<=",
                         "rightExpression": {
                           "argumentTypes": null,
-                          "id": 806,
+                          "id": 859,
                           "name": "denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 660,
-                          "src": "3110:12:2",
+                          "referencedDeclaration": 713,
+                          "src": "3110:12:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "3102:20:2",
+                        "src": "3102:20:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2026,14 +2026,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4665652065786365656473207472616e736665722076616c7565",
-                        "id": 808,
+                        "id": 861,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3124:28:2",
+                        "src": "3124:28:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2ce218df547d416f80ea8a5deadaf9453d23523ffa5f2e880a48adfdb4053a9c",
@@ -2053,21 +2053,21 @@
                           "typeString": "literal_string \"Fee exceeds transfer value\""
                         }
                       ],
-                      "id": 804,
+                      "id": 857,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "3094:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "3094:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 809,
+                    "id": 862,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2075,15 +2075,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3094:59:2",
+                    "src": "3094:59:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 810,
+                  "id": 863,
                   "nodeType": "ExpressionStatement",
-                  "src": "3094:59:2"
+                  "src": "3094:59:3"
                 },
                 {
                   "expression": {
@@ -2091,7 +2091,7 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 815,
+                        "id": 868,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2099,31 +2099,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "3167:32:2",
+                        "src": "3167:32:3",
                         "subExpression": {
                           "argumentTypes": null,
                           "baseExpression": {
                             "argumentTypes": null,
-                            "id": 812,
+                            "id": 865,
                             "name": "nullifierHashes",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 664,
-                            "src": "3168:15:2",
+                            "referencedDeclaration": 717,
+                            "src": "3168:15:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
-                          "id": 814,
+                          "id": 867,
                           "indexExpression": {
                             "argumentTypes": null,
-                            "id": 813,
+                            "id": 866,
                             "name": "_nullifierHash",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 791,
-                            "src": "3184:14:2",
+                            "referencedDeclaration": 844,
+                            "src": "3184:14:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2134,7 +2134,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "3168:31:2",
+                          "src": "3168:31:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
@@ -2148,14 +2148,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "546865206e6f746520686173206265656e20616c7265616479207370656e74",
-                        "id": 816,
+                        "id": 869,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3201:33:2",
+                        "src": "3201:33:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_a1bef92d7a18b1c6975dc8de68df6140a52afea05a2c6c91da2b1562c617e896",
@@ -2175,21 +2175,21 @@
                           "typeString": "literal_string \"The note has been already spent\""
                         }
                       ],
-                      "id": 811,
+                      "id": 864,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "3159:7:2",
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+                      "src": "3159:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 817,
+                    "id": 870,
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@@ -2197,15 +2197,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3159:76:2",
+                    "src": "3159:76:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 818,
+                  "id": 871,
                   "nodeType": "ExpressionStatement",
-                  "src": "3159:76:2"
+                  "src": "3159:76:3"
                 },
                 {
                   "expression": {
@@ -2216,12 +2216,12 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 821,
+                            "id": 874,
                             "name": "_root",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 789,
-                            "src": "3261:5:2",
+                            "referencedDeclaration": 842,
+                            "src": "3261:5:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2235,18 +2235,18 @@
                               "typeString": "bytes32"
                             }
                           ],
-                          "id": 820,
+                          "id": 873,
                           "name": "isKnownRoot",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 621,
-                          "src": "3249:11:2",
+                          "referencedDeclaration": 674,
+                          "src": "3249:11:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_bool_$",
                             "typeString": "function (bytes32) view returns (bool)"
                           }
                         },
-                        "id": 822,
+                        "id": 875,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2254,7 +2254,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3249:18:2",
+                        "src": "3249:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2263,14 +2263,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "43616e6e6f742066696e6420796f7572206d65726b6c6520726f6f74",
-                        "id": 823,
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                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3269:30:2",
+                        "src": "3269:30:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2a69086763073955418d2fd7dfee3d2f1fbc5b21047a216b7855d3f313d8e204",
@@ -2290,21 +2290,21 @@
                           "typeString": "literal_string \"Cannot find your merkle root\""
                         }
                       ],
-                      "id": 819,
+                      "id": 872,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "3241:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "3241:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 824,
+                    "id": 877,
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@@ -2312,15 +2312,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3241:59:2",
+                    "src": "3241:59:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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-                  "src": "3241:59:2"
+                  "src": "3241:59:3"
                 },
                 {
                   "expression": {
@@ -2331,12 +2331,12 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 829,
+                            "id": 882,
                             "name": "_proof",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 787,
-                            "src": "3368:6:2",
+                            "referencedDeclaration": 840,
+                            "src": "3368:6:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes_calldata_ptr",
                               "typeString": "bytes calldata"
@@ -2350,12 +2350,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 831,
+                                    "id": 884,
                                     "name": "_root",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 789,
-                                    "src": "3385:5:2",
+                                    "referencedDeclaration": 842,
+                                    "src": "3385:5:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2369,20 +2369,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
-                                  "id": 830,
+                                  "id": 883,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3377:7:2",
+                                  "src": "3377:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 832,
+                                "id": 885,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2390,7 +2390,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3377:14:2",
+                                "src": "3377:14:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2401,12 +2401,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 834,
+                                    "id": 887,
                                     "name": "_nullifierHash",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 791,
-                                    "src": "3401:14:2",
+                                    "referencedDeclaration": 844,
+                                    "src": "3401:14:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2420,20 +2420,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
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+                                  "id": 886,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3393:7:2",
+                                  "src": "3393:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 835,
+                                "id": 888,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2441,7 +2441,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3393:23:2",
+                                "src": "3393:23:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2452,12 +2452,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 837,
+                                    "id": 890,
                                     "name": "_recipient",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 793,
-                                    "src": "3426:10:2",
+                                    "referencedDeclaration": 846,
+                                    "src": "3426:10:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -2471,20 +2471,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
-                                  "id": 836,
+                                  "id": 889,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3418:7:2",
+                                  "src": "3418:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 838,
+                                "id": 891,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2492,7 +2492,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3418:19:2",
+                                "src": "3418:19:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2503,12 +2503,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 840,
+                                    "id": 893,
                                     "name": "_relayer",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 795,
-                                    "src": "3447:8:2",
+                                    "referencedDeclaration": 848,
+                                    "src": "3447:8:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -2522,20 +2522,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
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+                                  "id": 892,
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                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3439:7:2",
+                                  "src": "3439:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
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+                                "id": 894,
                                 "isConstant": false,
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@@ -2543,7 +2543,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3439:17:2",
+                                "src": "3439:17:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2551,12 +2551,12 @@
                               },
                               {
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+                                "id": 895,
                                 "name": "_fee",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 797,
-                                "src": "3458:4:2",
+                                "referencedDeclaration": 850,
+                                "src": "3458:4:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2564,26 +2564,26 @@
                               },
                               {
                                 "argumentTypes": null,
-                                "id": 843,
+                                "id": 896,
                                 "name": "_refund",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 799,
-                                "src": "3464:7:2",
+                                "referencedDeclaration": 852,
+                                "src": "3464:7:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
                                 }
                               }
                             ],
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                             "isPure": false,
                             "lValueRequested": false,
                             "nodeType": "TupleExpression",
-                            "src": "3376:96:2",
+                            "src": "3376:96:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_array$_t_uint256_$6_memory_ptr",
                               "typeString": "uint256[6] memory"
@@ -2603,32 +2603,32 @@
                           ],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 827,
+                            "id": 880,
                             "name": "verifier",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 670,
-                            "src": "3347:8:2",
+                            "referencedDeclaration": 723,
+                            "src": "3347:8:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IVerifier_$648",
+                              "typeIdentifier": "t_contract$_IVerifier_$701",
                               "typeString": "contract IVerifier"
                             }
                           },
-                          "id": 828,
+                          "id": 881,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "verifyProof",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 647,
-                          "src": "3347:20:2",
+                          "referencedDeclaration": 700,
+                          "src": "3347:20:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_nonpayable$_t_bytes_memory_ptr_$_t_array$_t_uint256_$6_memory_ptr_$returns$_t_bool_$",
                             "typeString": "function (bytes memory,uint256[6] memory) external returns (bool)"
                           }
                         },
-                        "id": 845,
+                        "id": 898,
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@@ -2636,7 +2636,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3347:126:2",
+                        "src": "3347:126:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2645,14 +2645,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "496e76616c69642077697468647261772070726f6f66",
-                        "id": 846,
+                        "id": 899,
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                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3475:24:2",
+                        "src": "3475:24:3",
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                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_7021ea58137dba96e572e94936410b0b0e4cbc344e1ab2ee7f47660768b81ff4",
@@ -2672,21 +2672,21 @@
                           "typeString": "literal_string \"Invalid withdraw proof\""
                         }
                       ],
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+                      "id": 879,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "3339:7:2",
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+                      "src": "3339:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 847,
+                    "id": 900,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2694,20 +2694,20 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3339:161:2",
+                    "src": "3339:161:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 848,
+                  "id": 901,
                   "nodeType": "ExpressionStatement",
-                  "src": "3339:161:2"
+                  "src": "3339:161:3"
                 },
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 853,
+                    "id": 906,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2716,26 +2716,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 849,
+                        "id": 902,
                         "name": "nullifierHashes",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 664,
-                        "src": "3507:15:2",
+                        "referencedDeclaration": 717,
+                        "src": "3507:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
                       },
-                      "id": 851,
+                      "id": 904,
                       "indexExpression": {
                         "argumentTypes": null,
-                        "id": 850,
+                        "id": 903,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3523:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3523:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2746,7 +2746,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "3507:31:2",
+                      "src": "3507:31:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
@@ -2757,14 +2757,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
-                      "id": 852,
+                      "id": 905,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "3541:4:2",
+                      "src": "3541:4:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
@@ -2772,15 +2772,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "3507:38:2",
+                    "src": "3507:38:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "id": 854,
+                  "id": 907,
                   "nodeType": "ExpressionStatement",
-                  "src": "3507:38:2"
+                  "src": "3507:38:3"
                 },
                 {
                   "expression": {
@@ -2788,12 +2788,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 856,
+                        "id": 909,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3568:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3568:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2801,12 +2801,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 857,
+                        "id": 910,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3580:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3580:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2814,12 +2814,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 858,
+                        "id": 911,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3590:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3590:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -2827,12 +2827,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 859,
+                        "id": 912,
                         "name": "_refund",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 799,
-                        "src": "3596:7:2",
+                        "referencedDeclaration": 852,
+                        "src": "3596:7:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -2845,32 +2845,32 @@
                           "argumentTypes": [],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 860,
+                            "id": 913,
                             "name": "feeManager",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 672,
-                            "src": "3605:10:2",
+                            "referencedDeclaration": 725,
+                            "src": "3605:10:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IFeeManager_$654",
+                              "typeIdentifier": "t_contract$_IFeeManager_$707",
                               "typeString": "contract IFeeManager"
                             }
                           },
-                          "id": 861,
+                          "id": 914,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "feeTo",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 653,
-                          "src": "3605:16:2",
+                          "referencedDeclaration": 706,
+                          "src": "3605:16:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_view$__$returns$_t_address_$",
                             "typeString": "function () view external returns (address)"
                           }
                         },
-                        "id": 862,
+                        "id": 915,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2878,7 +2878,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3605:18:2",
+                        "src": "3605:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -2908,18 +2908,18 @@
                           "typeString": "address"
                         }
                       ],
-                      "id": 855,
+                      "id": 908,
                       "name": "_processWithdraw",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 886,
-                      "src": "3551:16:2",
+                      "referencedDeclaration": 939,
+                      "src": "3551:16:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_payable_$_t_address_payable_$_t_uint256_$_t_uint256_$_t_address_$returns$__$",
                         "typeString": "function (address payable,address payable,uint256,uint256,address)"
                       }
                     },
-                    "id": 863,
+                    "id": 916,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2927,15 +2927,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3551:73:2",
+                    "src": "3551:73:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 864,
+                  "id": 917,
                   "nodeType": "ExpressionStatement",
-                  "src": "3551:73:2"
+                  "src": "3551:73:3"
                 },
                 {
                   "eventCall": {
@@ -2943,12 +2943,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 866,
+                        "id": 919,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3646:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3646:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2956,12 +2956,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 867,
+                        "id": 920,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3658:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3658:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2969,12 +2969,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 868,
+                        "id": 921,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3674:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3674:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -2982,12 +2982,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 869,
+                        "id": 922,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3684:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3684:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -3013,18 +3013,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 865,
+                      "id": 918,
                       "name": "Withdrawal",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 704,
-                      "src": "3635:10:2",
+                      "referencedDeclaration": 757,
+                      "src": "3635:10:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_bytes32_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,bytes32,address,uint256)"
                       }
                     },
-                    "id": 870,
+                    "id": 923,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3032,56 +3032,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3635:54:2",
+                    "src": "3635:54:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 871,
+                  "id": 924,
                   "nodeType": "EmitStatement",
-                  "src": "3630:59:2"
+                  "src": "3630:59:3"
                 }
               ]
             },
             "documentation": "@dev Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs\n`input` array consists of:\n- merkle root of all deposits in the contract\n- hash of unique deposit nullifier to prevent double spends\n- the recipient of funds\n- optional fee that goes to the transaction sender (usually a relay)",
-            "id": 873,
+            "id": 926,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 802,
+                "id": 855,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 801,
+                  "id": 854,
                   "name": "nonReentrant",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 999,
-                  "src": "3075:12:2",
+                  "referencedDeclaration": 1052,
+                  "src": "3075:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               }
             ],
             "name": "withdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 800,
+              "id": 853,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 787,
+                  "id": 840,
                   "name": "_proof",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2911:21:2",
+                  "scope": 926,
+                  "src": "2911:21:3",
                   "stateVariable": false,
                   "storageLocation": "calldata",
                   "typeDescriptions": {
@@ -3089,10 +3089,10 @@
                     "typeString": "bytes"
                   },
                   "typeName": {
-                    "id": 786,
+                    "id": 839,
                     "name": "bytes",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2911:5:2",
+                    "src": "2911:5:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes_storage_ptr",
                       "typeString": "bytes"
@@ -3103,11 +3103,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 789,
+                  "id": 842,
                   "name": "_root",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2934:13:2",
+                  "scope": 926,
+                  "src": "2934:13:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3115,10 +3115,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 788,
+                    "id": 841,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2934:7:2",
+                    "src": "2934:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3129,11 +3129,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 791,
+                  "id": 844,
                   "name": "_nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2949:22:2",
+                  "scope": 926,
+                  "src": "2949:22:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3141,10 +3141,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 790,
+                    "id": 843,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2949:7:2",
+                    "src": "2949:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3155,11 +3155,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 793,
+                  "id": 846,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2973:26:2",
+                  "scope": 926,
+                  "src": "2973:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3167,10 +3167,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 792,
+                    "id": 845,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2973:15:2",
+                    "src": "2973:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3182,11 +3182,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 795,
+                  "id": 848,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3001:24:2",
+                  "scope": 926,
+                  "src": "3001:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3194,10 +3194,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 794,
+                    "id": 847,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3001:15:2",
+                    "src": "3001:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3209,11 +3209,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 797,
+                  "id": 850,
                   "name": "_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3027:12:2",
+                  "scope": 926,
+                  "src": "3027:12:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3221,10 +3221,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 796,
+                    "id": 849,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3027:7:2",
+                    "src": "3027:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3235,11 +3235,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 799,
+                  "id": 852,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3041:15:2",
+                  "scope": 926,
+                  "src": "3041:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3247,10 +3247,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 798,
+                    "id": 851,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3041:7:2",
+                    "src": "3041:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3260,16 +3260,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2910:147:2"
+              "src": "2910:147:3"
             },
             "returnParameters": {
-              "id": 803,
+              "id": 856,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "3088:0:2"
+              "src": "3088:0:3"
             },
-            "scope": 970,
-            "src": "2893:801:2",
+            "scope": 1023,
+            "src": "2893:801:3",
             "stateMutability": "payable",
             "superFunction": null,
             "visibility": "external"
@@ -3277,23 +3277,23 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 886,
+            "id": 939,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 884,
+              "id": 937,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 875,
+                  "id": 928,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3783:26:2",
+                  "scope": 939,
+                  "src": "3783:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3301,10 +3301,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 874,
+                    "id": 927,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3783:15:2",
+                    "src": "3783:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3316,11 +3316,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 877,
+                  "id": 930,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3811:24:2",
+                  "scope": 939,
+                  "src": "3811:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3328,10 +3328,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 876,
+                    "id": 929,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3811:15:2",
+                    "src": "3811:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3343,11 +3343,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 879,
+                  "id": 932,
                   "name": "_relayer_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3837:20:2",
+                  "scope": 939,
+                  "src": "3837:20:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3355,10 +3355,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 878,
+                    "id": 931,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3837:7:2",
+                    "src": "3837:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3369,11 +3369,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 881,
+                  "id": 934,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3859:15:2",
+                  "scope": 939,
+                  "src": "3859:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3381,10 +3381,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 880,
+                    "id": 933,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3859:7:2",
+                    "src": "3859:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3395,11 +3395,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 883,
+                  "id": 936,
                   "name": "_feeTo",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3876:14:2",
+                  "scope": 939,
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@@ -3407,10 +3407,10 @@
                     "typeString": "address"
                   },
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+                    "id": 935,
                     "name": "address",
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+                    "src": "3876:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -3421,51 +3421,51 @@
                   "visibility": "internal"
                 }
               ],
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+              "src": "3782:109:3"
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+              "id": 950,
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@@ -3476,37 +3476,37 @@
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@@ -3514,10 +3514,10 @@
                     "typeString": "bytes32"
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+                    "id": 940,
                     "name": "bytes32",
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@@ -3527,19 +3527,19 @@
                   "visibility": "internal"
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@@ -3547,10 +3547,10 @@
                     "typeString": "bool"
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@@ -3560,36 +3560,36 @@
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                         "typeString": "bool[] memory"
@@ -3604,18 +3604,18 @@
                           "argumentTypes": null,
                           "expression": {
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-                            "id": 911,
+                            "id": 964,
                             "name": "_nullifierHashes",
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                             "overloadedDeclarations": [],
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                               "typeString": "bytes32[] calldata"
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@@ -3623,7 +3623,7 @@
                           "memberName": "length",
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@@ -3637,39 +3637,39 @@
                             "typeString": "uint256"
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                         "nodeType": "NewExpression",
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                           "typeString": "function (uint256) pure returns (bool[] memory)"
                         },
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+                            "id": 961,
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@@ -3677,27 +3677,27 @@
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                         "typeString": "bool[] memory"
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@@ -3707,26 +3707,26 @@
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@@ -3737,7 +3737,7 @@
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@@ -3751,18 +3751,18 @@
                                 "typeString": "bytes32"
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@@ -3770,25 +3770,25 @@
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@@ -3797,26 +3797,26 @@
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@@ -3827,7 +3827,7 @@
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@@ -3838,14 +3838,14 @@
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@@ -3853,15 +3853,15 @@
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                                   "value": "true"
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@@ -3874,19 +3874,19 @@
                       "typeIdentifier": "t_uint256",
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@@ -3898,18 +3898,18 @@
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@@ -3917,31 +3917,31 @@
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                         "typeString": "uint256"
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@@ -3949,10 +3949,10 @@
                           "typeString": "uint256"
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@@ -3962,18 +3962,18 @@
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@@ -3982,12 +3982,12 @@
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@@ -3995,15 +3995,15 @@
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@@ -4014,33 +4014,33 @@
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@@ -4049,19 +4049,19 @@
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@@ -4071,19 +4071,19 @@
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             "attributes": {
               "constant": false,
               "name": "commitments",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "mapping(bytes32 => bool)",
@@ -4884,34 +4884,34 @@
                       "name": "bytes32",
                       "type": "bytes32"
                     },
-                    "id": 665,
+                    "id": 718,
                     "name": "ElementaryTypeName",
-                    "src": "562:7:2"
+                    "src": "562:7:3"
                   },
                   {
                     "attributes": {
                       "name": "bool",
                       "type": "bool"
                     },
-                    "id": 666,
+                    "id": 719,
                     "name": "ElementaryTypeName",
-                    "src": "573:4:2"
+                    "src": "573:4:3"
                   }
                 ],
-                "id": 667,
+                "id": 720,
                 "name": "Mapping",
-                "src": "554:24:2"
+                "src": "554:24:3"
               }
             ],
-            "id": 668,
+            "id": 721,
             "name": "VariableDeclaration",
-            "src": "554:43:2"
+            "src": "554:43:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "verifier",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "contract IVerifier",
@@ -4923,23 +4923,23 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "IVerifier",
-                  "referencedDeclaration": 648,
+                  "referencedDeclaration": 701,
                   "type": "contract IVerifier"
                 },
-                "id": 669,
+                "id": 722,
                 "name": "UserDefinedTypeName",
-                "src": "601:9:2"
+                "src": "601:9:3"
               }
             ],
-            "id": 670,
+            "id": 723,
             "name": "VariableDeclaration",
-            "src": "601:25:2"
+            "src": "601:25:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "feeManager",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "contract IFeeManager",
@@ -4951,23 +4951,23 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "IFeeManager",
-                  "referencedDeclaration": 654,
+                  "referencedDeclaration": 707,
                   "type": "contract IFeeManager"
                 },
-                "id": 671,
+                "id": 724,
                 "name": "UserDefinedTypeName",
-                "src": "630:11:2"
+                "src": "630:11:3"
               }
             ],
-            "id": 672,
+            "id": 725,
             "name": "VariableDeclaration",
-            "src": "630:29:2"
+            "src": "630:29:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "operator",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "address",
@@ -4981,14 +4981,14 @@
                   "stateMutability": "nonpayable",
                   "type": "address"
                 },
-                "id": 673,
+                "id": 726,
                 "name": "ElementaryTypeName",
-                "src": "819:7:2"
+                "src": "819:7:3"
               }
             ],
-            "id": 674,
+            "id": 727,
             "name": "VariableDeclaration",
-            "src": "819:23:2"
+            "src": "819:23:3"
           },
           {
             "attributes": {
@@ -5004,9 +5004,9 @@
                   ]
                 },
                 "children": [],
-                "id": 675,
+                "id": 728,
                 "name": "ParameterList",
-                "src": "868:0:2"
+                "src": "868:0:3"
               },
               {
                 "children": [
@@ -5040,16 +5040,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 676,
+                            "id": 729,
                             "name": "Identifier",
-                            "src": "874:7:2"
+                            "src": "874:7:3"
                           },
                           {
                             "attributes": {
@@ -5084,18 +5084,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 1015,
+                                      "referencedDeclaration": 1068,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 677,
+                                    "id": 730,
                                     "name": "Identifier",
-                                    "src": "882:3:2"
+                                    "src": "882:3:3"
                                   }
                                 ],
-                                "id": 678,
+                                "id": 731,
                                 "name": "MemberAccess",
-                                "src": "882:10:2"
+                                "src": "882:10:3"
                               },
                               {
                                 "attributes": {
@@ -5103,18 +5103,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 674,
+                                  "referencedDeclaration": 727,
                                   "type": "address",
                                   "value": "operator"
                                 },
-                                "id": 679,
+                                "id": 732,
                                 "name": "Identifier",
-                                "src": "896:8:2"
+                                "src": "896:8:3"
                               }
                             ],
-                            "id": 680,
+                            "id": 733,
                             "name": "BinaryOperation",
-                            "src": "882:22:2"
+                            "src": "882:22:3"
                           },
                           {
                             "attributes": {
@@ -5129,34 +5129,34 @@
                               "type": "literal_string \"Only operator can call this function.\"",
                               "value": "Only operator can call this function."
                             },
-                            "id": 681,
+                            "id": 734,
                             "name": "Literal",
-                            "src": "906:39:2"
+                            "src": "906:39:3"
                           }
                         ],
-                        "id": 682,
+                        "id": 735,
                         "name": "FunctionCall",
-                        "src": "874:72:2"
+                        "src": "874:72:3"
                       }
                     ],
-                    "id": 683,
+                    "id": 736,
                     "name": "ExpressionStatement",
-                    "src": "874:72:2"
+                    "src": "874:72:3"
                   },
                   {
-                    "id": 684,
+                    "id": 737,
                     "name": "PlaceholderStatement",
-                    "src": "952:1:2"
+                    "src": "952:1:3"
                   }
                 ],
-                "id": 685,
+                "id": 738,
                 "name": "Block",
-                "src": "868:90:2"
+                "src": "868:90:3"
               }
             ],
-            "id": 686,
+            "id": 739,
             "name": "ModifierDefinition",
-            "src": "846:112:2"
+            "src": "846:112:3"
           },
           {
             "attributes": {
@@ -5172,7 +5172,7 @@
                       "constant": false,
                       "indexed": true,
                       "name": "commitment",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5185,21 +5185,21 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 687,
+                        "id": 740,
                         "name": "ElementaryTypeName",
-                        "src": "976:7:2"
+                        "src": "976:7:3"
                       }
                     ],
-                    "id": 688,
+                    "id": 741,
                     "name": "VariableDeclaration",
-                    "src": "976:26:2"
+                    "src": "976:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "leafIndex",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -5212,21 +5212,21 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 689,
+                        "id": 742,
                         "name": "ElementaryTypeName",
-                        "src": "1004:6:2"
+                        "src": "1004:6:3"
                       }
                     ],
-                    "id": 690,
+                    "id": 743,
                     "name": "VariableDeclaration",
-                    "src": "1004:16:2"
+                    "src": "1004:16:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "timestamp",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5239,24 +5239,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 691,
+                        "id": 744,
                         "name": "ElementaryTypeName",
-                        "src": "1022:7:2"
+                        "src": "1022:7:3"
                       }
                     ],
-                    "id": 692,
+                    "id": 745,
                     "name": "VariableDeclaration",
-                    "src": "1022:17:2"
+                    "src": "1022:17:3"
                   }
                 ],
-                "id": 693,
+                "id": 746,
                 "name": "ParameterList",
-                "src": "975:65:2"
+                "src": "975:65:3"
               }
             ],
-            "id": 694,
+            "id": 747,
             "name": "EventDefinition",
-            "src": "962:79:2"
+            "src": "962:79:3"
           },
           {
             "attributes": {
@@ -5272,7 +5272,7 @@
                       "constant": false,
                       "indexed": false,
                       "name": "to",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5286,21 +5286,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 695,
+                        "id": 748,
                         "name": "ElementaryTypeName",
-                        "src": "1061:7:2"
+                        "src": "1061:7:3"
                       }
                     ],
-                    "id": 696,
+                    "id": 749,
                     "name": "VariableDeclaration",
-                    "src": "1061:10:2"
+                    "src": "1061:10:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "nullifierHash",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5313,21 +5313,21 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 697,
+                        "id": 750,
                         "name": "ElementaryTypeName",
-                        "src": "1073:7:2"
+                        "src": "1073:7:3"
                       }
                     ],
-                    "id": 698,
+                    "id": 751,
                     "name": "VariableDeclaration",
-                    "src": "1073:21:2"
+                    "src": "1073:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": true,
                       "name": "relayer",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5341,21 +5341,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 699,
+                        "id": 752,
                         "name": "ElementaryTypeName",
-                        "src": "1096:7:2"
+                        "src": "1096:7:3"
                       }
                     ],
-                    "id": 700,
+                    "id": 753,
                     "name": "VariableDeclaration",
-                    "src": "1096:23:2"
+                    "src": "1096:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "fee",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5368,24 +5368,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 701,
+                        "id": 754,
                         "name": "ElementaryTypeName",
-                        "src": "1121:7:2"
+                        "src": "1121:7:3"
                       }
                     ],
-                    "id": 702,
+                    "id": 755,
                     "name": "VariableDeclaration",
-                    "src": "1121:11:2"
+                    "src": "1121:11:3"
                   }
                 ],
-                "id": 703,
+                "id": 756,
                 "name": "ParameterList",
-                "src": "1060:73:2"
+                "src": "1060:73:3"
               }
             ],
-            "id": 704,
+            "id": 757,
             "name": "EventDefinition",
-            "src": "1044:90:2"
+            "src": "1044:90:3"
           },
           {
             "attributes": {
@@ -5394,7 +5394,7 @@
               "isConstructor": true,
               "kind": "constructor",
               "name": "",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "public"
@@ -5406,7 +5406,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_verifier",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IVerifier",
@@ -5418,23 +5418,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IVerifier",
-                          "referencedDeclaration": 648,
+                          "referencedDeclaration": 701,
                           "type": "contract IVerifier"
                         },
-                        "id": 705,
+                        "id": 758,
                         "name": "UserDefinedTypeName",
-                        "src": "1450:9:2"
+                        "src": "1450:9:3"
                       }
                     ],
-                    "id": 706,
+                    "id": 759,
                     "name": "VariableDeclaration",
-                    "src": "1450:19:2"
+                    "src": "1450:19:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeManager",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IFeeManager",
@@ -5446,23 +5446,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IFeeManager",
-                          "referencedDeclaration": 654,
+                          "referencedDeclaration": 707,
                           "type": "contract IFeeManager"
                         },
-                        "id": 707,
+                        "id": 760,
                         "name": "UserDefinedTypeName",
-                        "src": "1475:11:2"
+                        "src": "1475:11:3"
                       }
                     ],
-                    "id": 708,
+                    "id": 761,
                     "name": "VariableDeclaration",
-                    "src": "1475:23:2"
+                    "src": "1475:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_denomination",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5475,20 +5475,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 709,
+                        "id": 762,
                         "name": "ElementaryTypeName",
-                        "src": "1504:7:2"
+                        "src": "1504:7:3"
                       }
                     ],
-                    "id": 710,
+                    "id": 763,
                     "name": "VariableDeclaration",
-                    "src": "1504:21:2"
+                    "src": "1504:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_merkleTreeHeight",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -5501,20 +5501,20 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 711,
+                        "id": 764,
                         "name": "ElementaryTypeName",
-                        "src": "1531:6:2"
+                        "src": "1531:6:3"
                       }
                     ],
-                    "id": 712,
+                    "id": 765,
                     "name": "VariableDeclaration",
-                    "src": "1531:24:2"
+                    "src": "1531:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_operator",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5528,19 +5528,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 713,
+                        "id": 766,
                         "name": "ElementaryTypeName",
-                        "src": "1561:7:2"
+                        "src": "1561:7:3"
                       }
                     ],
-                    "id": 714,
+                    "id": 767,
                     "name": "VariableDeclaration",
-                    "src": "1561:17:2"
+                    "src": "1561:17:3"
                   }
                 ],
-                "id": 715,
+                "id": 768,
                 "name": "ParameterList",
-                "src": "1444:138:2"
+                "src": "1444:138:3"
               },
               {
                 "attributes": {
@@ -5549,9 +5549,9 @@
                   ]
                 },
                 "children": [],
-                "id": 719,
+                "id": 772,
                 "name": "ParameterList",
-                "src": "1631:0:2"
+                "src": "1631:0:3"
               },
               {
                 "children": [
@@ -5561,13 +5561,13 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 632,
+                      "referencedDeclaration": 685,
                       "type": "type(contract MerkleTreeWithHistory)",
                       "value": "MerkleTreeWithHistory"
                     },
-                    "id": 716,
+                    "id": 769,
                     "name": "Identifier",
-                    "src": "1583:21:2"
+                    "src": "1583:21:3"
                   },
                   {
                     "attributes": {
@@ -5575,18 +5575,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 712,
+                      "referencedDeclaration": 765,
                       "type": "uint32",
                       "value": "_merkleTreeHeight"
                     },
-                    "id": 717,
+                    "id": 770,
                     "name": "Identifier",
-                    "src": "1605:17:2"
+                    "src": "1605:17:3"
                   }
                 ],
-                "id": 718,
+                "id": 771,
                 "name": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               },
               {
                 "children": [
@@ -5620,16 +5620,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 720,
+                            "id": 773,
                             "name": "Identifier",
-                            "src": "1637:7:2"
+                            "src": "1637:7:3"
                           },
                           {
                             "attributes": {
@@ -5652,13 +5652,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 710,
+                                  "referencedDeclaration": 763,
                                   "type": "uint256",
                                   "value": "_denomination"
                                 },
-                                "id": 721,
+                                "id": 774,
                                 "name": "Identifier",
-                                "src": "1645:13:2"
+                                "src": "1645:13:3"
                               },
                               {
                                 "attributes": {
@@ -5673,14 +5673,14 @@
                                   "type": "int_const 0",
                                   "value": "0"
                                 },
-                                "id": 722,
+                                "id": 775,
                                 "name": "Literal",
-                                "src": "1661:1:2"
+                                "src": "1661:1:3"
                               }
                             ],
-                            "id": 723,
+                            "id": 776,
                             "name": "BinaryOperation",
-                            "src": "1645:17:2"
+                            "src": "1645:17:3"
                           },
                           {
                             "attributes": {
@@ -5695,19 +5695,19 @@
                               "type": "literal_string \"denomination should be greater than 0\"",
                               "value": "denomination should be greater than 0"
                             },
-                            "id": 724,
+                            "id": 777,
                             "name": "Literal",
-                            "src": "1664:39:2"
+                            "src": "1664:39:3"
                           }
                         ],
-                        "id": 725,
+                        "id": 778,
                         "name": "FunctionCall",
-                        "src": "1637:67:2"
+                        "src": "1637:67:3"
                       }
                     ],
-                    "id": 726,
+                    "id": 779,
                     "name": "ExpressionStatement",
-                    "src": "1637:67:2"
+                    "src": "1637:67:3"
                   },
                   {
                     "children": [
@@ -5728,13 +5728,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 670,
+                              "referencedDeclaration": 723,
                               "type": "contract IVerifier",
                               "value": "verifier"
                             },
-                            "id": 727,
+                            "id": 780,
                             "name": "Identifier",
-                            "src": "1710:8:2"
+                            "src": "1710:8:3"
                           },
                           {
                             "attributes": {
@@ -5742,23 +5742,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 706,
+                              "referencedDeclaration": 759,
                               "type": "contract IVerifier",
                               "value": "_verifier"
                             },
-                            "id": 728,
+                            "id": 781,
                             "name": "Identifier",
-                            "src": "1721:9:2"
+                            "src": "1721:9:3"
                           }
                         ],
-                        "id": 729,
+                        "id": 782,
                         "name": "Assignment",
-                        "src": "1710:20:2"
+                        "src": "1710:20:3"
                       }
                     ],
-                    "id": 730,
+                    "id": 783,
                     "name": "ExpressionStatement",
-                    "src": "1710:20:2"
+                    "src": "1710:20:3"
                   },
                   {
                     "children": [
@@ -5779,13 +5779,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 672,
+                              "referencedDeclaration": 725,
                               "type": "contract IFeeManager",
                               "value": "feeManager"
                             },
-                            "id": 731,
+                            "id": 784,
                             "name": "Identifier",
-                            "src": "1736:10:2"
+                            "src": "1736:10:3"
                           },
                           {
                             "attributes": {
@@ -5793,23 +5793,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 708,
+                              "referencedDeclaration": 761,
                               "type": "contract IFeeManager",
                               "value": "_feeManager"
                             },
-                            "id": 732,
+                            "id": 785,
                             "name": "Identifier",
-                            "src": "1749:11:2"
+                            "src": "1749:11:3"
                           }
                         ],
-                        "id": 733,
+                        "id": 786,
                         "name": "Assignment",
-                        "src": "1736:24:2"
+                        "src": "1736:24:3"
                       }
                     ],
-                    "id": 734,
+                    "id": 787,
                     "name": "ExpressionStatement",
-                    "src": "1736:24:2"
+                    "src": "1736:24:3"
                   },
                   {
                     "children": [
@@ -5830,13 +5830,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 674,
+                              "referencedDeclaration": 727,
                               "type": "address",
                               "value": "operator"
                             },
-                            "id": 735,
+                            "id": 788,
                             "name": "Identifier",
-                            "src": "1766:8:2"
+                            "src": "1766:8:3"
                           },
                           {
                             "attributes": {
@@ -5844,23 +5844,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 714,
+                              "referencedDeclaration": 767,
                               "type": "address",
                               "value": "_operator"
                             },
-                            "id": 736,
+                            "id": 789,
                             "name": "Identifier",
-                            "src": "1777:9:2"
+                            "src": "1777:9:3"
                           }
                         ],
-                        "id": 737,
+                        "id": 790,
                         "name": "Assignment",
-                        "src": "1766:20:2"
+                        "src": "1766:20:3"
                       }
                     ],
-                    "id": 738,
+                    "id": 791,
                     "name": "ExpressionStatement",
-                    "src": "1766:20:2"
+                    "src": "1766:20:3"
                   },
                   {
                     "children": [
@@ -5881,13 +5881,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 660,
+                              "referencedDeclaration": 713,
                               "type": "uint256",
                               "value": "denomination"
                             },
-                            "id": 739,
+                            "id": 792,
                             "name": "Identifier",
-                            "src": "1792:12:2"
+                            "src": "1792:12:3"
                           },
                           {
                             "attributes": {
@@ -5895,33 +5895,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 710,
+                              "referencedDeclaration": 763,
                               "type": "uint256",
                               "value": "_denomination"
                             },
-                            "id": 740,
+                            "id": 793,
                             "name": "Identifier",
-                            "src": "1807:13:2"
+                            "src": "1807:13:3"
                           }
                         ],
-                        "id": 741,
+                        "id": 794,
                         "name": "Assignment",
-                        "src": "1792:28:2"
+                        "src": "1792:28:3"
                       }
                     ],
-                    "id": 742,
+                    "id": 795,
                     "name": "ExpressionStatement",
-                    "src": "1792:28:2"
+                    "src": "1792:28:3"
                   }
                 ],
-                "id": 743,
+                "id": 796,
                 "name": "Block",
-                "src": "1631:194:2"
+                "src": "1631:194:3"
               }
             ],
-            "id": 744,
+            "id": 797,
             "name": "FunctionDefinition",
-            "src": "1433:392:2"
+            "src": "1433:392:3"
           },
           {
             "attributes": {
@@ -5930,7 +5930,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "deposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -5942,7 +5942,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_commitment",
-                      "scope": 782,
+                      "scope": 835,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5955,19 +5955,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 745,
+                        "id": 798,
                         "name": "ElementaryTypeName",
-                        "src": "2090:7:2"
+                        "src": "2090:7:3"
                       }
                     ],
-                    "id": 746,
+                    "id": 799,
                     "name": "VariableDeclaration",
-                    "src": "2090:19:2"
+                    "src": "2090:19:3"
                   }
                 ],
-                "id": 747,
+                "id": 800,
                 "name": "ParameterList",
-                "src": "2089:21:2"
+                "src": "2089:21:3"
               },
               {
                 "attributes": {
@@ -5976,9 +5976,9 @@
                   ]
                 },
                 "children": [],
-                "id": 750,
+                "id": 803,
                 "name": "ParameterList",
-                "src": "2141:0:2"
+                "src": "2141:0:3"
               },
               {
                 "attributes": {
@@ -5991,18 +5991,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
-                    "id": 748,
+                    "id": 801,
                     "name": "Identifier",
-                    "src": "2128:12:2"
+                    "src": "2128:12:3"
                   }
                 ],
-                "id": 749,
+                "id": 802,
                 "name": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               },
               {
                 "children": [
@@ -6036,16 +6036,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 751,
+                            "id": 804,
                             "name": "Identifier",
-                            "src": "2147:7:2"
+                            "src": "2147:7:3"
                           },
                           {
                             "attributes": {
@@ -6075,13 +6075,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 668,
+                                      "referencedDeclaration": 721,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "commitments"
                                     },
-                                    "id": 752,
+                                    "id": 805,
                                     "name": "Identifier",
-                                    "src": "2156:11:2"
+                                    "src": "2156:11:3"
                                   },
                                   {
                                     "attributes": {
@@ -6089,23 +6089,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 746,
+                                      "referencedDeclaration": 799,
                                       "type": "bytes32",
                                       "value": "_commitment"
                                     },
-                                    "id": 753,
+                                    "id": 806,
                                     "name": "Identifier",
-                                    "src": "2168:11:2"
+                                    "src": "2168:11:3"
                                   }
                                 ],
-                                "id": 754,
+                                "id": 807,
                                 "name": "IndexAccess",
-                                "src": "2156:24:2"
+                                "src": "2156:24:3"
                               }
                             ],
-                            "id": 755,
+                            "id": 808,
                             "name": "UnaryOperation",
-                            "src": "2155:25:2"
+                            "src": "2155:25:3"
                           },
                           {
                             "attributes": {
@@ -6120,24 +6120,24 @@
                               "type": "literal_string \"The commitment has been submitted\"",
                               "value": "The commitment has been submitted"
                             },
-                            "id": 756,
+                            "id": 809,
                             "name": "Literal",
-                            "src": "2182:35:2"
+                            "src": "2182:35:3"
                           }
                         ],
-                        "id": 757,
+                        "id": 810,
                         "name": "FunctionCall",
-                        "src": "2147:71:2"
+                        "src": "2147:71:3"
                       }
                     ],
-                    "id": 758,
+                    "id": 811,
                     "name": "ExpressionStatement",
-                    "src": "2147:71:2"
+                    "src": "2147:71:3"
                   },
                   {
                     "attributes": {
                       "assignments": [
-                        760
+                        813
                       ]
                     },
                     "children": [
@@ -6145,7 +6145,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "insertedIndex",
-                          "scope": 781,
+                          "scope": 834,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "uint32",
@@ -6158,14 +6158,14 @@
                               "name": "uint32",
                               "type": "uint32"
                             },
-                            "id": 759,
+                            "id": 812,
                             "name": "ElementaryTypeName",
-                            "src": "2225:6:2"
+                            "src": "2225:6:3"
                           }
                         ],
-                        "id": 760,
+                        "id": 813,
                         "name": "VariableDeclaration",
-                        "src": "2225:20:2"
+                        "src": "2225:20:3"
                       },
                       {
                         "attributes": {
@@ -6193,13 +6193,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 574,
+                              "referencedDeclaration": 627,
                               "type": "function (bytes32) returns (uint32)",
                               "value": "_insert"
                             },
-                            "id": 761,
+                            "id": 814,
                             "name": "Identifier",
-                            "src": "2248:7:2"
+                            "src": "2248:7:3"
                           },
                           {
                             "attributes": {
@@ -6207,23 +6207,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 762,
+                            "id": 815,
                             "name": "Identifier",
-                            "src": "2256:11:2"
+                            "src": "2256:11:3"
                           }
                         ],
-                        "id": 763,
+                        "id": 816,
                         "name": "FunctionCall",
-                        "src": "2248:20:2"
+                        "src": "2248:20:3"
                       }
                     ],
-                    "id": 764,
+                    "id": 817,
                     "name": "VariableDeclarationStatement",
-                    "src": "2225:43:2"
+                    "src": "2225:43:3"
                   },
                   {
                     "children": [
@@ -6254,13 +6254,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 668,
+                                  "referencedDeclaration": 721,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "commitments"
                                 },
-                                "id": 765,
+                                "id": 818,
                                 "name": "Identifier",
-                                "src": "2274:11:2"
+                                "src": "2274:11:3"
                               },
                               {
                                 "attributes": {
@@ -6268,18 +6268,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 746,
+                                  "referencedDeclaration": 799,
                                   "type": "bytes32",
                                   "value": "_commitment"
                                 },
-                                "id": 766,
+                                "id": 819,
                                 "name": "Identifier",
-                                "src": "2286:11:2"
+                                "src": "2286:11:3"
                               }
                             ],
-                            "id": 767,
+                            "id": 820,
                             "name": "IndexAccess",
-                            "src": "2274:24:2"
+                            "src": "2274:24:3"
                           },
                           {
                             "attributes": {
@@ -6294,19 +6294,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 768,
+                            "id": 821,
                             "name": "Literal",
-                            "src": "2301:4:2"
+                            "src": "2301:4:3"
                           }
                         ],
-                        "id": 769,
+                        "id": 822,
                         "name": "Assignment",
-                        "src": "2274:31:2"
+                        "src": "2274:31:3"
                       }
                     ],
-                    "id": 770,
+                    "id": 823,
                     "name": "ExpressionStatement",
-                    "src": "2274:31:2"
+                    "src": "2274:31:3"
                   },
                   {
                     "children": [
@@ -6336,23 +6336,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 785,
+                              "referencedDeclaration": 838,
                               "type": "function ()",
                               "value": "_processDeposit"
                             },
-                            "id": 771,
+                            "id": 824,
                             "name": "Identifier",
-                            "src": "2311:15:2"
+                            "src": "2311:15:3"
                           }
                         ],
-                        "id": 772,
+                        "id": 825,
                         "name": "FunctionCall",
-                        "src": "2311:17:2"
+                        "src": "2311:17:3"
                       }
                     ],
-                    "id": 773,
+                    "id": 826,
                     "name": "ExpressionStatement",
-                    "src": "2311:17:2"
+                    "src": "2311:17:3"
                   },
                   {
                     "children": [
@@ -6390,13 +6390,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 694,
+                              "referencedDeclaration": 747,
                               "type": "function (bytes32,uint32,uint256)",
                               "value": "Deposit"
                             },
-                            "id": 774,
+                            "id": 827,
                             "name": "Identifier",
-                            "src": "2340:7:2"
+                            "src": "2340:7:3"
                           },
                           {
                             "attributes": {
@@ -6404,13 +6404,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 775,
+                            "id": 828,
                             "name": "Identifier",
-                            "src": "2348:11:2"
+                            "src": "2348:11:3"
                           },
                           {
                             "attributes": {
@@ -6418,13 +6418,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 760,
+                              "referencedDeclaration": 813,
                               "type": "uint32",
                               "value": "insertedIndex"
                             },
-                            "id": 776,
+                            "id": 829,
                             "name": "Identifier",
-                            "src": "2361:13:2"
+                            "src": "2361:13:3"
                           },
                           {
                             "attributes": {
@@ -6444,38 +6444,38 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 1005,
+                                  "referencedDeclaration": 1058,
                                   "type": "block",
                                   "value": "block"
                                 },
-                                "id": 777,
+                                "id": 830,
                                 "name": "Identifier",
-                                "src": "2376:5:2"
+                                "src": "2376:5:3"
                               }
                             ],
-                            "id": 778,
+                            "id": 831,
                             "name": "MemberAccess",
-                            "src": "2376:15:2"
+                            "src": "2376:15:3"
                           }
                         ],
-                        "id": 779,
+                        "id": 832,
                         "name": "FunctionCall",
-                        "src": "2340:52:2"
+                        "src": "2340:52:3"
                       }
                     ],
-                    "id": 780,
+                    "id": 833,
                     "name": "EmitStatement",
-                    "src": "2335:57:2"
+                    "src": "2335:57:3"
                   }
                 ],
-                "id": 781,
+                "id": 834,
                 "name": "Block",
-                "src": "2141:256:2"
+                "src": "2141:256:3"
               }
             ],
-            "id": 782,
+            "id": 835,
             "name": "FunctionDefinition",
-            "src": "2073:324:2"
+            "src": "2073:324:3"
           },
           {
             "attributes": {
@@ -6488,7 +6488,7 @@
                 null
               ],
               "name": "_processDeposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -6501,9 +6501,9 @@
                   ]
                 },
                 "children": [],
-                "id": 783,
+                "id": 836,
                 "name": "ParameterList",
-                "src": "2484:2:2"
+                "src": "2484:2:3"
               },
               {
                 "attributes": {
@@ -6512,14 +6512,14 @@
                   ]
                 },
                 "children": [],
-                "id": 784,
+                "id": 837,
                 "name": "ParameterList",
-                "src": "2495:0:2"
+                "src": "2495:0:3"
               }
             ],
-            "id": 785,
+            "id": 838,
             "name": "FunctionDefinition",
-            "src": "2460:36:2"
+            "src": "2460:36:3"
           },
           {
             "attributes": {
@@ -6528,7 +6528,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "withdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -6540,7 +6540,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_proof",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes",
@@ -6553,20 +6553,20 @@
                           "name": "bytes",
                           "type": "bytes"
                         },
-                        "id": 786,
+                        "id": 839,
                         "name": "ElementaryTypeName",
-                        "src": "2911:5:2"
+                        "src": "2911:5:3"
                       }
                     ],
-                    "id": 787,
+                    "id": 840,
                     "name": "VariableDeclaration",
-                    "src": "2911:21:2"
+                    "src": "2911:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_root",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -6579,20 +6579,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 788,
+                        "id": 841,
                         "name": "ElementaryTypeName",
-                        "src": "2934:7:2"
+                        "src": "2934:7:3"
                       }
                     ],
-                    "id": 789,
+                    "id": 842,
                     "name": "VariableDeclaration",
-                    "src": "2934:13:2"
+                    "src": "2934:13:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -6605,20 +6605,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 790,
+                        "id": 843,
                         "name": "ElementaryTypeName",
-                        "src": "2949:7:2"
+                        "src": "2949:7:3"
                       }
                     ],
-                    "id": 791,
+                    "id": 844,
                     "name": "VariableDeclaration",
-                    "src": "2949:22:2"
+                    "src": "2949:22:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -6632,20 +6632,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 792,
+                        "id": 845,
                         "name": "ElementaryTypeName",
-                        "src": "2973:15:2"
+                        "src": "2973:15:3"
                       }
                     ],
-                    "id": 793,
+                    "id": 846,
                     "name": "VariableDeclaration",
-                    "src": "2973:26:2"
+                    "src": "2973:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -6659,20 +6659,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 794,
+                        "id": 847,
                         "name": "ElementaryTypeName",
-                        "src": "3001:15:2"
+                        "src": "3001:15:3"
                       }
                     ],
-                    "id": 795,
+                    "id": 848,
                     "name": "VariableDeclaration",
-                    "src": "3001:24:2"
+                    "src": "3001:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_fee",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6685,20 +6685,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 796,
+                        "id": 849,
                         "name": "ElementaryTypeName",
-                        "src": "3027:7:2"
+                        "src": "3027:7:3"
                       }
                     ],
-                    "id": 797,
+                    "id": 850,
                     "name": "VariableDeclaration",
-                    "src": "3027:12:2"
+                    "src": "3027:12:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -6711,19 +6711,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 798,
+                        "id": 851,
                         "name": "ElementaryTypeName",
-                        "src": "3041:7:2"
+                        "src": "3041:7:3"
                       }
                     ],
-                    "id": 799,
+                    "id": 852,
                     "name": "VariableDeclaration",
-                    "src": "3041:15:2"
+                    "src": "3041:15:3"
                   }
                 ],
-                "id": 800,
+                "id": 853,
                 "name": "ParameterList",
-                "src": "2910:147:2"
+                "src": "2910:147:3"
               },
               {
                 "attributes": {
@@ -6732,9 +6732,9 @@
                   ]
                 },
                 "children": [],
-                "id": 803,
+                "id": 856,
                 "name": "ParameterList",
-                "src": "3088:0:2"
+                "src": "3088:0:3"
               },
               {
                 "attributes": {
@@ -6747,18 +6747,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
-                    "id": 801,
+                    "id": 854,
                     "name": "Identifier",
-                    "src": "3075:12:2"
+                    "src": "3075:12:3"
                   }
                 ],
-                "id": 802,
+                "id": 855,
                 "name": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               },
               {
                 "children": [
@@ -6792,16 +6792,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 804,
+                            "id": 857,
                             "name": "Identifier",
-                            "src": "3094:7:2"
+                            "src": "3094:7:3"
                           },
                           {
                             "attributes": {
@@ -6824,13 +6824,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 797,
+                                  "referencedDeclaration": 850,
                                   "type": "uint256",
                                   "value": "_fee"
                                 },
-                                "id": 805,
+                                "id": 858,
                                 "name": "Identifier",
-                                "src": "3102:4:2"
+                                "src": "3102:4:3"
                               },
                               {
                                 "attributes": {
@@ -6838,18 +6838,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 660,
+                                  "referencedDeclaration": 713,
                                   "type": "uint256",
                                   "value": "denomination"
                                 },
-                                "id": 806,
+                                "id": 859,
                                 "name": "Identifier",
-                                "src": "3110:12:2"
+                                "src": "3110:12:3"
                               }
                             ],
-                            "id": 807,
+                            "id": 860,
                             "name": "BinaryOperation",
-                            "src": "3102:20:2"
+                            "src": "3102:20:3"
                           },
                           {
                             "attributes": {
@@ -6864,19 +6864,19 @@
                               "type": "literal_string \"Fee exceeds transfer value\"",
                               "value": "Fee exceeds transfer value"
                             },
-                            "id": 808,
+                            "id": 861,
                             "name": "Literal",
-                            "src": "3124:28:2"
+                            "src": "3124:28:3"
                           }
                         ],
-                        "id": 809,
+                        "id": 862,
                         "name": "FunctionCall",
-                        "src": "3094:59:2"
+                        "src": "3094:59:3"
                       }
                     ],
-                    "id": 810,
+                    "id": 863,
                     "name": "ExpressionStatement",
-                    "src": "3094:59:2"
+                    "src": "3094:59:3"
                   },
                   {
                     "children": [
@@ -6908,16 +6908,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 811,
+                            "id": 864,
                             "name": "Identifier",
-                            "src": "3159:7:2"
+                            "src": "3159:7:3"
                           },
                           {
                             "attributes": {
@@ -6947,13 +6947,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 664,
+                                      "referencedDeclaration": 717,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "nullifierHashes"
                                     },
-                                    "id": 812,
+                                    "id": 865,
                                     "name": "Identifier",
-                                    "src": "3168:15:2"
+                                    "src": "3168:15:3"
                                   },
                                   {
                                     "attributes": {
@@ -6961,23 +6961,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 791,
+                                      "referencedDeclaration": 844,
                                       "type": "bytes32",
                                       "value": "_nullifierHash"
                                     },
-                                    "id": 813,
+                                    "id": 866,
                                     "name": "Identifier",
-                                    "src": "3184:14:2"
+                                    "src": "3184:14:3"
                                   }
                                 ],
-                                "id": 814,
+                                "id": 867,
                                 "name": "IndexAccess",
-                                "src": "3168:31:2"
+                                "src": "3168:31:3"
                               }
                             ],
-                            "id": 815,
+                            "id": 868,
                             "name": "UnaryOperation",
-                            "src": "3167:32:2"
+                            "src": "3167:32:3"
                           },
                           {
                             "attributes": {
@@ -6992,19 +6992,19 @@
                               "type": "literal_string \"The note has been already spent\"",
                               "value": "The note has been already spent"
                             },
-                            "id": 816,
+                            "id": 869,
                             "name": "Literal",
-                            "src": "3201:33:2"
+                            "src": "3201:33:3"
                           }
                         ],
-                        "id": 817,
+                        "id": 870,
                         "name": "FunctionCall",
-                        "src": "3159:76:2"
+                        "src": "3159:76:3"
                       }
                     ],
-                    "id": 818,
+                    "id": 871,
                     "name": "ExpressionStatement",
-                    "src": "3159:76:2"
+                    "src": "3159:76:3"
                   },
                   {
                     "children": [
@@ -7036,16 +7036,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 819,
+                            "id": 872,
                             "name": "Identifier",
-                            "src": "3241:7:2"
+                            "src": "3241:7:3"
                           },
                           {
                             "attributes": {
@@ -7073,13 +7073,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 621,
+                                  "referencedDeclaration": 674,
                                   "type": "function (bytes32) view returns (bool)",
                                   "value": "isKnownRoot"
                                 },
-                                "id": 820,
+                                "id": 873,
                                 "name": "Identifier",
-                                "src": "3249:11:2"
+                                "src": "3249:11:3"
                               },
                               {
                                 "attributes": {
@@ -7087,18 +7087,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 789,
+                                  "referencedDeclaration": 842,
                                   "type": "bytes32",
                                   "value": "_root"
                                 },
-                                "id": 821,
+                                "id": 874,
                                 "name": "Identifier",
-                                "src": "3261:5:2"
+                                "src": "3261:5:3"
                               }
                             ],
-                            "id": 822,
+                            "id": 875,
                             "name": "FunctionCall",
-                            "src": "3249:18:2"
+                            "src": "3249:18:3"
                           },
                           {
                             "attributes": {
@@ -7113,19 +7113,19 @@
                               "type": "literal_string \"Cannot find your merkle root\"",
                               "value": "Cannot find your merkle root"
                             },
-                            "id": 823,
+                            "id": 876,
                             "name": "Literal",
-                            "src": "3269:30:2"
+                            "src": "3269:30:3"
                           }
                         ],
-                        "id": 824,
+                        "id": 877,
                         "name": "FunctionCall",
-                        "src": "3241:59:2"
+                        "src": "3241:59:3"
                       }
                     ],
-                    "id": 825,
+                    "id": 878,
                     "name": "ExpressionStatement",
-                    "src": "3241:59:2"
+                    "src": "3241:59:3"
                   },
                   {
                     "children": [
@@ -7157,16 +7157,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 826,
+                            "id": 879,
                             "name": "Identifier",
-                            "src": "3339:7:2"
+                            "src": "3339:7:3"
                           },
                           {
                             "attributes": {
@@ -7200,7 +7200,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "verifyProof",
-                                  "referencedDeclaration": 647,
+                                  "referencedDeclaration": 700,
                                   "type": "function (bytes memory,uint256[6] memory) external returns (bool)"
                                 },
                                 "children": [
@@ -7210,18 +7210,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 670,
+                                      "referencedDeclaration": 723,
                                       "type": "contract IVerifier",
                                       "value": "verifier"
                                     },
-                                    "id": 827,
+                                    "id": 880,
                                     "name": "Identifier",
-                                    "src": "3347:8:2"
+                                    "src": "3347:8:3"
                                   }
                                 ],
-                                "id": 828,
+                                "id": 881,
                                 "name": "MemberAccess",
-                                "src": "3347:20:2"
+                                "src": "3347:20:3"
                               },
                               {
                                 "attributes": {
@@ -7229,13 +7229,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 787,
+                                  "referencedDeclaration": 840,
                                   "type": "bytes calldata",
                                   "value": "_proof"
                                 },
-                                "id": 829,
+                                "id": 882,
                                 "name": "Identifier",
-                                "src": "3368:6:2"
+                                "src": "3368:6:3"
                               },
                               {
                                 "attributes": {
@@ -7278,9 +7278,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 830,
+                                        "id": 883,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3377:7:2"
+                                        "src": "3377:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7288,18 +7288,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 789,
+                                          "referencedDeclaration": 842,
                                           "type": "bytes32",
                                           "value": "_root"
                                         },
-                                        "id": 831,
+                                        "id": 884,
                                         "name": "Identifier",
-                                        "src": "3385:5:2"
+                                        "src": "3385:5:3"
                                       }
                                     ],
-                                    "id": 832,
+                                    "id": 885,
                                     "name": "FunctionCall",
-                                    "src": "3377:14:2"
+                                    "src": "3377:14:3"
                                   },
                                   {
                                     "attributes": {
@@ -7331,9 +7331,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 833,
+                                        "id": 886,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3393:7:2"
+                                        "src": "3393:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7341,18 +7341,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 791,
+                                          "referencedDeclaration": 844,
                                           "type": "bytes32",
                                           "value": "_nullifierHash"
                                         },
-                                        "id": 834,
+                                        "id": 887,
                                         "name": "Identifier",
-                                        "src": "3401:14:2"
+                                        "src": "3401:14:3"
                                       }
                                     ],
-                                    "id": 835,
+                                    "id": 888,
                                     "name": "FunctionCall",
-                                    "src": "3393:23:2"
+                                    "src": "3393:23:3"
                                   },
                                   {
                                     "attributes": {
@@ -7384,9 +7384,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 836,
+                                        "id": 889,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3418:7:2"
+                                        "src": "3418:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7394,18 +7394,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 793,
+                                          "referencedDeclaration": 846,
                                           "type": "address payable",
                                           "value": "_recipient"
                                         },
-                                        "id": 837,
+                                        "id": 890,
                                         "name": "Identifier",
-                                        "src": "3426:10:2"
+                                        "src": "3426:10:3"
                                       }
                                     ],
-                                    "id": 838,
+                                    "id": 891,
                                     "name": "FunctionCall",
-                                    "src": "3418:19:2"
+                                    "src": "3418:19:3"
                                   },
                                   {
                                     "attributes": {
@@ -7437,9 +7437,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 839,
+                                        "id": 892,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3439:7:2"
+                                        "src": "3439:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7447,18 +7447,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 795,
+                                          "referencedDeclaration": 848,
                                           "type": "address payable",
                                           "value": "_relayer"
                                         },
-                                        "id": 840,
+                                        "id": 893,
                                         "name": "Identifier",
-                                        "src": "3447:8:2"
+                                        "src": "3447:8:3"
                                       }
                                     ],
-                                    "id": 841,
+                                    "id": 894,
                                     "name": "FunctionCall",
-                                    "src": "3439:17:2"
+                                    "src": "3439:17:3"
                                   },
                                   {
                                     "attributes": {
@@ -7466,13 +7466,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 797,
+                                      "referencedDeclaration": 850,
                                       "type": "uint256",
                                       "value": "_fee"
                                     },
-                                    "id": 842,
+                                    "id": 895,
                                     "name": "Identifier",
-                                    "src": "3458:4:2"
+                                    "src": "3458:4:3"
                                   },
                                   {
                                     "attributes": {
@@ -7480,23 +7480,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 799,
+                                      "referencedDeclaration": 852,
                                       "type": "uint256",
                                       "value": "_refund"
                                     },
-                                    "id": 843,
+                                    "id": 896,
                                     "name": "Identifier",
-                                    "src": "3464:7:2"
+                                    "src": "3464:7:3"
                                   }
                                 ],
-                                "id": 844,
+                                "id": 897,
                                 "name": "TupleExpression",
-                                "src": "3376:96:2"
+                                "src": "3376:96:3"
                               }
                             ],
-                            "id": 845,
+                            "id": 898,
                             "name": "FunctionCall",
-                            "src": "3347:126:2"
+                            "src": "3347:126:3"
                           },
                           {
                             "attributes": {
@@ -7511,19 +7511,19 @@
                               "type": "literal_string \"Invalid withdraw proof\"",
                               "value": "Invalid withdraw proof"
                             },
-                            "id": 846,
+                            "id": 899,
                             "name": "Literal",
-                            "src": "3475:24:2"
+                            "src": "3475:24:3"
                           }
                         ],
-                        "id": 847,
+                        "id": 900,
                         "name": "FunctionCall",
-                        "src": "3339:161:2"
+                        "src": "3339:161:3"
                       }
                     ],
-                    "id": 848,
+                    "id": 901,
                     "name": "ExpressionStatement",
-                    "src": "3339:161:2"
+                    "src": "3339:161:3"
                   },
                   {
                     "children": [
@@ -7554,13 +7554,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 664,
+                                  "referencedDeclaration": 717,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "nullifierHashes"
                                 },
-                                "id": 849,
+                                "id": 902,
                                 "name": "Identifier",
-                                "src": "3507:15:2"
+                                "src": "3507:15:3"
                               },
                               {
                                 "attributes": {
@@ -7568,18 +7568,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 791,
+                                  "referencedDeclaration": 844,
                                   "type": "bytes32",
                                   "value": "_nullifierHash"
                                 },
-                                "id": 850,
+                                "id": 903,
                                 "name": "Identifier",
-                                "src": "3523:14:2"
+                                "src": "3523:14:3"
                               }
                             ],
-                            "id": 851,
+                            "id": 904,
                             "name": "IndexAccess",
-                            "src": "3507:31:2"
+                            "src": "3507:31:3"
                           },
                           {
                             "attributes": {
@@ -7594,19 +7594,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 852,
+                            "id": 905,
                             "name": "Literal",
-                            "src": "3541:4:2"
+                            "src": "3541:4:3"
                           }
                         ],
-                        "id": 853,
+                        "id": 906,
                         "name": "Assignment",
-                        "src": "3507:38:2"
+                        "src": "3507:38:3"
                       }
                     ],
-                    "id": 854,
+                    "id": 907,
                     "name": "ExpressionStatement",
-                    "src": "3507:38:2"
+                    "src": "3507:38:3"
                   },
                   {
                     "children": [
@@ -7652,13 +7652,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 886,
+                              "referencedDeclaration": 939,
                               "type": "function (address payable,address payable,uint256,uint256,address)",
                               "value": "_processWithdraw"
                             },
-                            "id": 855,
+                            "id": 908,
                             "name": "Identifier",
-                            "src": "3551:16:2"
+                            "src": "3551:16:3"
                           },
                           {
                             "attributes": {
@@ -7666,13 +7666,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 856,
+                            "id": 909,
                             "name": "Identifier",
-                            "src": "3568:10:2"
+                            "src": "3568:10:3"
                           },
                           {
                             "attributes": {
@@ -7680,13 +7680,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 857,
+                            "id": 910,
                             "name": "Identifier",
-                            "src": "3580:8:2"
+                            "src": "3580:8:3"
                           },
                           {
                             "attributes": {
@@ -7694,13 +7694,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 858,
+                            "id": 911,
                             "name": "Identifier",
-                            "src": "3590:4:2"
+                            "src": "3590:4:3"
                           },
                           {
                             "attributes": {
@@ -7708,13 +7708,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 799,
+                              "referencedDeclaration": 852,
                               "type": "uint256",
                               "value": "_refund"
                             },
-                            "id": 859,
+                            "id": 912,
                             "name": "Identifier",
-                            "src": "3596:7:2"
+                            "src": "3596:7:3"
                           },
                           {
                             "attributes": {
@@ -7744,7 +7744,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "feeTo",
-                                  "referencedDeclaration": 653,
+                                  "referencedDeclaration": 706,
                                   "type": "function () view external returns (address)"
                                 },
                                 "children": [
@@ -7754,33 +7754,33 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 672,
+                                      "referencedDeclaration": 725,
                                       "type": "contract IFeeManager",
                                       "value": "feeManager"
                                     },
-                                    "id": 860,
+                                    "id": 913,
                                     "name": "Identifier",
-                                    "src": "3605:10:2"
+                                    "src": "3605:10:3"
                                   }
                                 ],
-                                "id": 861,
+                                "id": 914,
                                 "name": "MemberAccess",
-                                "src": "3605:16:2"
+                                "src": "3605:16:3"
                               }
                             ],
-                            "id": 862,
+                            "id": 915,
                             "name": "FunctionCall",
-                            "src": "3605:18:2"
+                            "src": "3605:18:3"
                           }
                         ],
-                        "id": 863,
+                        "id": 916,
                         "name": "FunctionCall",
-                        "src": "3551:73:2"
+                        "src": "3551:73:3"
                       }
                     ],
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                     "name": "ExpressionStatement",
-                    "src": "3551:73:2"
+                    "src": "3551:73:3"
                   },
                   {
                     "children": [
@@ -7822,13 +7822,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 704,
+                              "referencedDeclaration": 757,
                               "type": "function (address,bytes32,address,uint256)",
                               "value": "Withdrawal"
                             },
-                            "id": 865,
+                            "id": 918,
                             "name": "Identifier",
-                            "src": "3635:10:2"
+                            "src": "3635:10:3"
                           },
                           {
                             "attributes": {
@@ -7836,13 +7836,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 866,
+                            "id": 919,
                             "name": "Identifier",
-                            "src": "3646:10:2"
+                            "src": "3646:10:3"
                           },
                           {
                             "attributes": {
@@ -7850,13 +7850,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 791,
+                              "referencedDeclaration": 844,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 867,
+                            "id": 920,
                             "name": "Identifier",
-                            "src": "3658:14:2"
+                            "src": "3658:14:3"
                           },
                           {
                             "attributes": {
@@ -7864,13 +7864,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 868,
+                            "id": 921,
                             "name": "Identifier",
-                            "src": "3674:8:2"
+                            "src": "3674:8:3"
                           },
                           {
                             "attributes": {
@@ -7878,33 +7878,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 869,
+                            "id": 922,
                             "name": "Identifier",
-                            "src": "3684:4:2"
+                            "src": "3684:4:3"
                           }
                         ],
-                        "id": 870,
+                        "id": 923,
                         "name": "FunctionCall",
-                        "src": "3635:54:2"
+                        "src": "3635:54:3"
                       }
                     ],
-                    "id": 871,
+                    "id": 924,
                     "name": "EmitStatement",
-                    "src": "3630:59:2"
+                    "src": "3630:59:3"
                   }
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-                "id": 872,
+                "id": 925,
                 "name": "Block",
-                "src": "3088:606:2"
+                "src": "3088:606:3"
               }
             ],
-            "id": 873,
+            "id": 926,
             "name": "FunctionDefinition",
-            "src": "2893:801:2"
+            "src": "2893:801:3"
           },
           {
             "attributes": {
@@ -7917,7 +7917,7 @@
                 null
               ],
               "name": "_processWithdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -7929,7 +7929,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7943,20 +7943,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 874,
+                        "id": 927,
                         "name": "ElementaryTypeName",
-                        "src": "3783:15:2"
+                        "src": "3783:15:3"
                       }
                     ],
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+                    "id": 928,
                     "name": "VariableDeclaration",
-                    "src": "3783:26:2"
+                    "src": "3783:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7970,20 +7970,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 876,
+                        "id": 929,
                         "name": "ElementaryTypeName",
-                        "src": "3811:15:2"
+                        "src": "3811:15:3"
                       }
                     ],
-                    "id": 877,
+                    "id": 930,
                     "name": "VariableDeclaration",
-                    "src": "3811:24:2"
+                    "src": "3811:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer_fee",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -7996,20 +7996,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 878,
+                        "id": 931,
                         "name": "ElementaryTypeName",
-                        "src": "3837:7:2"
+                        "src": "3837:7:3"
                       }
                     ],
-                    "id": 879,
+                    "id": 932,
                     "name": "VariableDeclaration",
-                    "src": "3837:20:2"
+                    "src": "3837:20:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -8022,20 +8022,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 880,
+                        "id": 933,
                         "name": "ElementaryTypeName",
-                        "src": "3859:7:2"
+                        "src": "3859:7:3"
                       }
                     ],
-                    "id": 881,
+                    "id": 934,
                     "name": "VariableDeclaration",
-                    "src": "3859:15:2"
+                    "src": "3859:15:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeTo",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -8049,19 +8049,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 882,
+                        "id": 935,
                         "name": "ElementaryTypeName",
-                        "src": "3876:7:2"
+                        "src": "3876:7:3"
                       }
                     ],
-                    "id": 883,
+                    "id": 936,
                     "name": "VariableDeclaration",
-                    "src": "3876:14:2"
+                    "src": "3876:14:3"
                   }
                 ],
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+                "id": 937,
                 "name": "ParameterList",
-                "src": "3782:109:2"
+                "src": "3782:109:3"
               },
               {
                 "attributes": {
@@ -8070,14 +8070,14 @@
                   ]
                 },
                 "children": [],
-                "id": 885,
+                "id": 938,
                 "name": "ParameterList",
-                "src": "3900:0:2"
+                "src": "3900:0:3"
               }
             ],
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+            "id": 939,
             "name": "FunctionDefinition",
-            "src": "3757:144:2"
+            "src": "3757:144:3"
           },
           {
             "attributes": {
@@ -8089,7 +8089,7 @@
                 null
               ],
               "name": "isSpent",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "public"
@@ -8101,7 +8101,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -8114,19 +8114,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 887,
+                        "id": 940,
                         "name": "ElementaryTypeName",
-                        "src": "3968:7:2"
+                        "src": "3968:7:3"
                       }
                     ],
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+                    "id": 941,
                     "name": "VariableDeclaration",
-                    "src": "3968:22:2"
+                    "src": "3968:22:3"
                   }
                 ],
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+                "id": 942,
                 "name": "ParameterList",
-                "src": "3967:24:2"
+                "src": "3967:24:3"
               },
               {
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@@ -8134,7 +8134,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bool",
@@ -8147,25 +8147,25 @@
                           "name": "bool",
                           "type": "bool"
                         },
-                        "id": 890,
+                        "id": 943,
                         "name": "ElementaryTypeName",
-                        "src": "4012:4:2"
+                        "src": "4012:4:3"
                       }
                     ],
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                     "name": "VariableDeclaration",
-                    "src": "4012:4:2"
+                    "src": "4012:4:3"
                   }
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+                "id": 945,
                 "name": "ParameterList",
-                "src": "4011:6:2"
+                "src": "4011:6:3"
               },
               {
                 "children": [
                   {
                     "attributes": {
-                      "functionReturnParameters": 892
+                      "functionReturnParameters": 945
                     },
                     "children": [
                       {
@@ -8184,13 +8184,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 664,
+                              "referencedDeclaration": 717,
                               "type": "mapping(bytes32 => bool)",
                               "value": "nullifierHashes"
                             },
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+                            "id": 946,
                             "name": "Identifier",
-                            "src": "4031:15:2"
+                            "src": "4031:15:3"
                           },
                           {
                             "attributes": {
@@ -8198,33 +8198,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 888,
+                              "referencedDeclaration": 941,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 894,
+                            "id": 947,
                             "name": "Identifier",
-                            "src": "4047:14:2"
+                            "src": "4047:14:3"
                           }
                         ],
-                        "id": 895,
+                        "id": 948,
                         "name": "IndexAccess",
-                        "src": "4031:31:2"
+                        "src": "4031:31:3"
                       }
                     ],
-                    "id": 896,
+                    "id": 949,
                     "name": "Return",
-                    "src": "4024:38:2"
+                    "src": "4024:38:3"
                   }
                 ],
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+                "id": 950,
                 "name": "Block",
-                "src": "4018:49:2"
+                "src": "4018:49:3"
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             ],
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             "name": "FunctionDefinition",
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+            "src": "3951:116:3"
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           {
             "attributes": {
@@ -8236,7 +8236,7 @@
                 null
               ],
               "name": "isSpentArray",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "external"
@@ -8248,7 +8248,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHashes",
-                      "scope": 943,
+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes32[]",
@@ -8267,24 +8267,24 @@
                               "name": "bytes32",
                               "type": "bytes32"
                             },
-                            "id": 899,
+                            "id": 952,
                             "name": "ElementaryTypeName",
-                            "src": "4150:7:2"
+                            "src": "4150:7:3"
                           }
                         ],
-                        "id": 900,
+                        "id": 953,
                         "name": "ArrayTypeName",
-                        "src": "4150:9:2"
+                        "src": "4150:9:3"
                       }
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                     "name": "VariableDeclaration",
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                 "name": "ParameterList",
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@@ -8292,7 +8292,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "spent",
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+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "memory",
                       "type": "bool[]",
@@ -8311,24 +8311,24 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 903,
+                            "id": 956,
                             "name": "ElementaryTypeName",
-                            "src": "4209:4:2"
+                            "src": "4209:4:3"
                           }
                         ],
-                        "id": 904,
+                        "id": 957,
                         "name": "ArrayTypeName",
-                        "src": "4209:6:2"
+                        "src": "4209:6:3"
                       }
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                 "name": "ParameterList",
-                "src": "4208:21:2"
+                "src": "4208:21:3"
               },
               {
                 "children": [
@@ -8351,13 +8351,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 905,
+                              "referencedDeclaration": 958,
                               "type": "bool[] memory",
                               "value": "spent"
                             },
-                            "id": 907,
+                            "id": 960,
                             "name": "Identifier",
-                            "src": "4236:5:2"
+                            "src": "4236:5:3"
                           },
                           {
                             "attributes": {
@@ -8400,19 +8400,19 @@
                                           "name": "bool",
                                           "type": "bool"
                                         },
-                                        "id": 908,
+                                        "id": 961,
                                         "name": "ElementaryTypeName",
-                                        "src": "4248:4:2"
+                                        "src": "4248:4:3"
                                       }
                                     ],
-                                    "id": 909,
+                                    "id": 962,
                                     "name": "ArrayTypeName",
-                                    "src": "4248:6:2"
+                                    "src": "4248:6:3"
                                   }
                                 ],
-                                "id": 910,
+                                "id": 963,
                                 "name": "NewExpression",
-                                "src": "4244:10:2"
+                                "src": "4244:10:3"
                               },
                               {
                                 "attributes": {
@@ -8432,40 +8432,40 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 901,
+                                      "referencedDeclaration": 954,
                                       "type": "bytes32[] calldata",
                                       "value": "_nullifierHashes"
                                     },
-                                    "id": 911,
+                                    "id": 964,
                                     "name": "Identifier",
-                                    "src": "4255:16:2"
+                                    "src": "4255:16:3"
                                   }
                                 ],
-                                "id": 912,
+                                "id": 965,
                                 "name": "MemberAccess",
-                                "src": "4255:23:2"
+                                "src": "4255:23:3"
                               }
                             ],
-                            "id": 913,
+                            "id": 966,
                             "name": "FunctionCall",
-                            "src": "4244:35:2"
+                            "src": "4244:35:3"
                           }
                         ],
-                        "id": 914,
+                        "id": 967,
                         "name": "Assignment",
-                        "src": "4236:43:2"
+                        "src": "4236:43:3"
                       }
                     ],
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                     "name": "ExpressionStatement",
-                    "src": "4236:43:2"
+                    "src": "4236:43:3"
                   },
                   {
                     "children": [
                       {
                         "attributes": {
                           "assignments": [
-                            917
+                            970
                           ]
                         },
                         "children": [
@@ -8473,7 +8473,7 @@
                             "attributes": {
                               "constant": false,
                               "name": "i",
-                              "scope": 941,
+                              "scope": 994,
                               "stateVariable": false,
                               "storageLocation": "default",
                               "type": "uint256",
@@ -8486,14 +8486,14 @@
                                   "name": "uint",
                                   "type": "uint256"
                                 },
-                                "id": 916,
+                                "id": 969,
                                 "name": "ElementaryTypeName",
-                                "src": "4289:4:2"
+                                "src": "4289:4:3"
                               }
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+                            "id": 970,
                             "name": "VariableDeclaration",
-                            "src": "4289:6:2"
+                            "src": "4289:6:3"
                           },
                           {
                             "attributes": {
@@ -8508,14 +8508,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 918,
+                            "id": 971,
                             "name": "Literal",
-                            "src": "4298:1:2"
+                            "src": "4298:1:3"
                           }
                         ],
-                        "id": 919,
+                        "id": 972,
                         "name": "VariableDeclarationStatement",
-                        "src": "4289:10:2"
+                        "src": "4289:10:3"
                       },
                       {
                         "attributes": {
@@ -8538,13 +8538,13 @@
                               "overloadedDeclarations": [
                                 null
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-                              "referencedDeclaration": 917,
+                              "referencedDeclaration": 970,
                               "type": "uint256",
                               "value": "i"
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+                            "id": 973,
                             "name": "Identifier",
-                            "src": "4301:1:2"
+                            "src": "4301:1:3"
                           },
                           {
                             "attributes": {
@@ -8564,23 +8564,23 @@
                                   "overloadedDeclarations": [
                                     null
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-                                  "referencedDeclaration": 901,
+                                  "referencedDeclaration": 954,
                                   "type": "bytes32[] calldata",
                                   "value": "_nullifierHashes"
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+                                "id": 974,
                                 "name": "Identifier",
-                                "src": "4305:16:2"
+                                "src": "4305:16:3"
                               }
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-                            "id": 922,
+                            "id": 975,
                             "name": "MemberAccess",
-                            "src": "4305:23:2"
+                            "src": "4305:23:3"
                           }
                         ],
-                        "id": 923,
+                        "id": 976,
                         "name": "BinaryOperation",
-                        "src": "4301:27:2"
+                        "src": "4301:27:3"
                       },
                       {
                         "children": [
@@ -8602,23 +8602,23 @@
                                   "overloadedDeclarations": [
                                     null
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-                                  "referencedDeclaration": 917,
+                                  "referencedDeclaration": 970,
                                   "type": "uint256",
                                   "value": "i"
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+                                "id": 977,
                                 "name": "Identifier",
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+                                "src": "4330:1:3"
                               }
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-                            "id": 925,
+                            "id": 978,
                             "name": "UnaryOperation",
-                            "src": "4330:3:2"
+                            "src": "4330:3:3"
                           }
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-                        "id": 926,
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                         "name": "ExpressionStatement",
-                        "src": "4330:3:2"
+                        "src": "4330:3:3"
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                       {
                         "children": [
@@ -8653,13 +8653,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 898,
+                                      "referencedDeclaration": 951,
                                       "type": "function (bytes32) view returns (bool)",
                                       "value": "isSpent"
                                     },
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+                                    "id": 980,
                                     "name": "Identifier",
-                                    "src": "4347:7:2"
+                                    "src": "4347:7:3"
                                   },
                                   {
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@@ -8677,13 +8677,13 @@
                                           "overloadedDeclarations": [
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-                                          "referencedDeclaration": 901,
+                                          "referencedDeclaration": 954,
                                           "type": "bytes32[] calldata",
                                           "value": "_nullifierHashes"
                                         },
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+                                        "id": 981,
                                         "name": "Identifier",
-                                        "src": "4355:16:2"
+                                        "src": "4355:16:3"
                                       },
                                       {
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@@ -8691,23 +8691,23 @@
                                           "overloadedDeclarations": [
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-                                          "referencedDeclaration": 917,
+                                          "referencedDeclaration": 970,
                                           "type": "uint256",
                                           "value": "i"
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+                                        "id": 982,
                                         "name": "Identifier",
-                                        "src": "4372:1:2"
+                                        "src": "4372:1:3"
                                       }
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-                                    "id": 930,
+                                    "id": 983,
                                     "name": "IndexAccess",
-                                    "src": "4355:19:2"
+                                    "src": "4355:19:3"
                                   }
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-                                "id": 931,
+                                "id": 984,
                                 "name": "FunctionCall",
-                                "src": "4347:28:2"
+                                "src": "4347:28:3"
                               },
                               {
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@@ -8740,13 +8740,13 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 905,
+                                                  "referencedDeclaration": 958,
                                                   "type": "bool[] memory",
                                                   "value": "spent"
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@@ -8754,18 +8754,18 @@
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@@ -8780,49 +8780,49 @@
                                               "type": "bool",
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@@ -8831,7 +8831,7 @@
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@@ -8843,7 +8843,7 @@
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@@ -8857,19 +8857,19 @@
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@@ -8878,9 +8878,9 @@
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@@ -8893,18 +8893,18 @@
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@@ -8927,13 +8927,13 @@
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@@ -8961,13 +8961,13 @@
                                   "overloadedDeclarations": [
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@@ -8975,38 +8975,38 @@
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@@ -9015,7 +9015,7 @@
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@@ -9027,7 +9027,7 @@
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@@ -9041,19 +9041,19 @@
                           "stateMutability": "nonpayable",
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                         "name": "ElementaryTypeName",
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@@ -9062,9 +9062,9 @@
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@@ -9077,18 +9077,18 @@
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@@ -9111,13 +9111,13 @@
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                             "name": "Identifier",
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@@ -9125,43 +9125,43 @@
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@@ -9169,7 +9169,7 @@
   },
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diff --git a/client/contracts/Migrations.json b/client/contracts/Migrations.json
index c7d4749..f827627 100644
--- a/client/contracts/Migrations.json
+++ b/client/contracts/Migrations.json
@@ -1480,7 +1480,7 @@
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   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-03-22T02:54:26.428Z",
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diff --git a/client/contracts/Tornado.json b/client/contracts/Tornado.json
index b79c737..7a1ad3a 100644
--- a/client/contracts/Tornado.json
+++ b/client/contracts/Tornado.json
@@ -550,47 +550,47 @@
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-        "src": "0:23:2"
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-        "sourceUnit": 633,
-        "src": "25:37:2",
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+        "src": "25:37:3",
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-        "src": "63:59:2",
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@@ -600,9 +600,9 @@
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@@ -610,23 +610,23 @@
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-                  "src": "168:19:2",
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@@ -634,10 +634,10 @@
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@@ -648,11 +648,11 @@
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@@ -661,27 +661,27 @@
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-                      "src": "197:1:2",
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@@ -690,7 +690,7 @@
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-                    "src": "189:10:2",
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@@ -700,19 +700,19 @@
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@@ -720,10 +720,10 @@
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@@ -733,17 +733,17 @@
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@@ -751,9 +751,9 @@
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@@ -791,10 +791,10 @@
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@@ -805,17 +805,17 @@
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-            "src": "265:49:2",
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@@ -823,62 +823,62 @@
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-              "src": "338:21:2",
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+              "src": "338:21:3",
               "typeDescriptions": {
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+                "typeIdentifier": "t_contract$_MerkleTreeWithHistory_$685",
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               "typeDescriptions": {
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+                "typeIdentifier": "t_contract$_ReentrancyGuard_$1053",
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         "contractDependencies": [
-          632,
-          1000
+          685,
+          1053
         ],
         "contractKind": "contract",
         "documentation": null,
         "fullyImplemented": false,
-        "id": 970,
+        "id": 1023,
         "linearizedBaseContracts": [
-          970,
-          1000,
-          632
+          1023,
+          1053,
+          685
         ],
         "name": "Tornado",
         "nodeType": "ContractDefinition",
         "nodes": [
           {
             "constant": false,
-            "id": 660,
+            "id": 713,
             "name": "denomination",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "381:27:2",
+            "scope": 1023,
+            "src": "381:27:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
@@ -886,10 +886,10 @@
               "typeString": "uint256"
             },
             "typeName": {
-              "id": 659,
+              "id": 712,
               "name": "uint256",
               "nodeType": "ElementaryTypeName",
-              "src": "381:7:2",
+              "src": "381:7:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_uint256",
                 "typeString": "uint256"
@@ -900,11 +900,11 @@
           },
           {
             "constant": false,
-            "id": 664,
+            "id": 717,
             "name": "nullifierHashes",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "412:47:2",
+            "scope": 1023,
+            "src": "412:47:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
@@ -912,28 +912,28 @@
               "typeString": "mapping(bytes32 => bool)"
             },
             "typeName": {
-              "id": 663,
+              "id": 716,
               "keyType": {
-                "id": 661,
+                "id": 714,
                 "name": "bytes32",
                 "nodeType": "ElementaryTypeName",
-                "src": "420:7:2",
+                "src": "420:7:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "412:24:2",
+              "src": "412:24:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                 "typeString": "mapping(bytes32 => bool)"
               },
               "valueType": {
-                "id": 662,
+                "id": 715,
                 "name": "bool",
                 "nodeType": "ElementaryTypeName",
-                "src": "431:4:2",
+                "src": "431:4:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bool",
                   "typeString": "bool"
@@ -945,11 +945,11 @@
           },
           {
             "constant": false,
-            "id": 668,
+            "id": 721,
             "name": "commitments",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "554:43:2",
+            "scope": 1023,
+            "src": "554:43:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
@@ -957,28 +957,28 @@
               "typeString": "mapping(bytes32 => bool)"
             },
             "typeName": {
-              "id": 667,
+              "id": 720,
               "keyType": {
-                "id": 665,
+                "id": 718,
                 "name": "bytes32",
                 "nodeType": "ElementaryTypeName",
-                "src": "562:7:2",
+                "src": "562:7:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bytes32",
                   "typeString": "bytes32"
                 }
               },
               "nodeType": "Mapping",
-              "src": "554:24:2",
+              "src": "554:24:3",
               "typeDescriptions": {
                 "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                 "typeString": "mapping(bytes32 => bool)"
               },
               "valueType": {
-                "id": 666,
+                "id": 719,
                 "name": "bool",
                 "nodeType": "ElementaryTypeName",
-                "src": "573:4:2",
+                "src": "573:4:3",
                 "typeDescriptions": {
                   "typeIdentifier": "t_bool",
                   "typeString": "bool"
@@ -990,26 +990,26 @@
           },
           {
             "constant": false,
-            "id": 670,
+            "id": 723,
             "name": "verifier",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "601:25:2",
+            "scope": 1023,
+            "src": "601:25:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IVerifier_$648",
+              "typeIdentifier": "t_contract$_IVerifier_$701",
               "typeString": "contract IVerifier"
             },
             "typeName": {
               "contractScope": null,
-              "id": 669,
+              "id": 722,
               "name": "IVerifier",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 648,
-              "src": "601:9:2",
+              "referencedDeclaration": 701,
+              "src": "601:9:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IVerifier_$648",
+                "typeIdentifier": "t_contract$_IVerifier_$701",
                 "typeString": "contract IVerifier"
               }
             },
@@ -1018,26 +1018,26 @@
           },
           {
             "constant": false,
-            "id": 672,
+            "id": 725,
             "name": "feeManager",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "630:29:2",
+            "scope": 1023,
+            "src": "630:29:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
-              "typeIdentifier": "t_contract$_IFeeManager_$654",
+              "typeIdentifier": "t_contract$_IFeeManager_$707",
               "typeString": "contract IFeeManager"
             },
             "typeName": {
               "contractScope": null,
-              "id": 671,
+              "id": 724,
               "name": "IFeeManager",
               "nodeType": "UserDefinedTypeName",
-              "referencedDeclaration": 654,
-              "src": "630:11:2",
+              "referencedDeclaration": 707,
+              "src": "630:11:3",
               "typeDescriptions": {
-                "typeIdentifier": "t_contract$_IFeeManager_$654",
+                "typeIdentifier": "t_contract$_IFeeManager_$707",
                 "typeString": "contract IFeeManager"
               }
             },
@@ -1046,11 +1046,11 @@
           },
           {
             "constant": false,
-            "id": 674,
+            "id": 727,
             "name": "operator",
             "nodeType": "VariableDeclaration",
-            "scope": 970,
-            "src": "819:23:2",
+            "scope": 1023,
+            "src": "819:23:3",
             "stateVariable": true,
             "storageLocation": "default",
             "typeDescriptions": {
@@ -1058,10 +1058,10 @@
               "typeString": "address"
             },
             "typeName": {
-              "id": 673,
+              "id": 726,
               "name": "address",
               "nodeType": "ElementaryTypeName",
-              "src": "819:7:2",
+              "src": "819:7:3",
               "stateMutability": "nonpayable",
               "typeDescriptions": {
                 "typeIdentifier": "t_address",
@@ -1073,9 +1073,9 @@
           },
           {
             "body": {
-              "id": 685,
+              "id": 738,
               "nodeType": "Block",
-              "src": "868:90:2",
+              "src": "868:90:3",
               "statements": [
                 {
                   "expression": {
@@ -1087,7 +1087,7 @@
                           "typeIdentifier": "t_address",
                           "typeString": "address"
                         },
-                        "id": 680,
+                        "id": 733,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -1096,18 +1096,18 @@
                           "argumentTypes": null,
                           "expression": {
                             "argumentTypes": null,
-                            "id": 677,
+                            "id": 730,
                             "name": "msg",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 1015,
-                            "src": "882:3:2",
+                            "referencedDeclaration": 1068,
+                            "src": "882:3:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_magic_message",
                               "typeString": "msg"
                             }
                           },
-                          "id": 678,
+                          "id": 731,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -1115,7 +1115,7 @@
                           "memberName": "sender",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "882:10:2",
+                          "src": "882:10:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address_payable",
                             "typeString": "address payable"
@@ -1125,18 +1125,18 @@
                         "operator": "==",
                         "rightExpression": {
                           "argumentTypes": null,
-                          "id": 679,
+                          "id": 732,
                           "name": "operator",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 674,
-                          "src": "896:8:2",
+                          "referencedDeclaration": 727,
+                          "src": "896:8:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_address",
                             "typeString": "address"
                           }
                         },
-                        "src": "882:22:2",
+                        "src": "882:22:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1145,14 +1145,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4f6e6c79206f70657261746f722063616e2063616c6c20746869732066756e6374696f6e2e",
-                        "id": 681,
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                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "906:39:2",
+                        "src": "906:39:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_e8393660073679be7a6133571fe2ca8983a31a683c72e9055f401ac33a2efffc",
@@ -1172,21 +1172,21 @@
                           "typeString": "literal_string \"Only operator can call this function.\""
                         }
                       ],
-                      "id": 676,
+                      "id": 729,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "874:7:2",
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                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 682,
+                    "id": 735,
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@@ -1194,54 +1194,54 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "874:72:2",
+                    "src": "874:72:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 683,
+                  "id": 736,
                   "nodeType": "ExpressionStatement",
-                  "src": "874:72:2"
+                  "src": "874:72:3"
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                 {
-                  "id": 684,
+                  "id": 737,
                   "nodeType": "PlaceholderStatement",
-                  "src": "952:1:2"
+                  "src": "952:1:3"
                 }
               ]
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             "documentation": null,
-            "id": 686,
+            "id": 739,
             "name": "onlyOperator",
             "nodeType": "ModifierDefinition",
             "parameters": {
-              "id": 675,
+              "id": 728,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "868:0:2"
+              "src": "868:0:3"
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-            "src": "846:112:2",
+            "src": "846:112:3",
             "visibility": "internal"
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           {
             "anonymous": false,
             "documentation": null,
-            "id": 694,
+            "id": 747,
             "name": "Deposit",
             "nodeType": "EventDefinition",
             "parameters": {
-              "id": 693,
+              "id": 746,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 688,
+                  "id": 741,
                   "indexed": true,
                   "name": "commitment",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "976:26:2",
+                  "scope": 747,
+                  "src": "976:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1249,10 +1249,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 687,
+                    "id": 740,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "976:7:2",
+                    "src": "976:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -1263,12 +1263,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 690,
+                  "id": 743,
                   "indexed": false,
                   "name": "leafIndex",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "1004:16:2",
+                  "scope": 747,
+                  "src": "1004:16:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1276,10 +1276,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
-                    "id": 689,
+                    "id": 742,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1004:6:2",
+                    "src": "1004:6:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -1290,12 +1290,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 692,
+                  "id": 745,
                   "indexed": false,
                   "name": "timestamp",
                   "nodeType": "VariableDeclaration",
-                  "scope": 694,
-                  "src": "1022:17:2",
+                  "scope": 747,
+                  "src": "1022:17:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1303,10 +1303,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 691,
+                    "id": 744,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1022:7:2",
+                    "src": "1022:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -1316,28 +1316,28 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "975:65:2"
+              "src": "975:65:3"
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-            "src": "962:79:2"
+            "src": "962:79:3"
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             "anonymous": false,
             "documentation": null,
-            "id": 704,
+            "id": 757,
             "name": "Withdrawal",
             "nodeType": "EventDefinition",
             "parameters": {
-              "id": 703,
+              "id": 756,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
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                   "indexed": false,
                   "name": "to",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1061:10:2",
+                  "scope": 757,
+                  "src": "1061:10:3",
                   "stateVariable": false,
                   "storageLocation": "default",
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@@ -1345,10 +1345,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 695,
+                    "id": 748,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1061:7:2",
+                    "src": "1061:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -1360,12 +1360,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 698,
+                  "id": 751,
                   "indexed": false,
                   "name": "nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1073:21:2",
+                  "scope": 757,
+                  "src": "1073:21:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1373,10 +1373,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 697,
+                    "id": 750,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1073:7:2",
+                    "src": "1073:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -1387,12 +1387,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 700,
+                  "id": 753,
                   "indexed": true,
                   "name": "relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1096:23:2",
+                  "scope": 757,
+                  "src": "1096:23:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1400,10 +1400,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 699,
+                    "id": 752,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1096:7:2",
+                    "src": "1096:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -1415,12 +1415,12 @@
                 },
                 {
                   "constant": false,
-                  "id": 702,
+                  "id": 755,
                   "indexed": false,
                   "name": "fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 704,
-                  "src": "1121:11:2",
+                  "scope": 757,
+                  "src": "1121:11:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -1428,10 +1428,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 701,
+                    "id": 754,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1121:7:2",
+                    "src": "1121:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -1441,15 +1441,15 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1060:73:2"
+              "src": "1060:73:3"
             },
-            "src": "1044:90:2"
+            "src": "1044:90:3"
           },
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+              "id": 796,
               "nodeType": "Block",
-              "src": "1631:194:2",
+              "src": "1631:194:3",
               "statements": [
                 {
                   "expression": {
@@ -1461,19 +1461,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 723,
+                        "id": 776,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
-                          "id": 721,
+                          "id": 774,
                           "name": "_denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 710,
-                          "src": "1645:13:2",
+                          "referencedDeclaration": 763,
+                          "src": "1645:13:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -1484,14 +1484,14 @@
                         "rightExpression": {
                           "argumentTypes": null,
                           "hexValue": "30",
-                          "id": 722,
+                          "id": 775,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": true,
                           "kind": "number",
                           "lValueRequested": false,
                           "nodeType": "Literal",
-                          "src": "1661:1:2",
+                          "src": "1661:1:3",
                           "subdenomination": null,
                           "typeDescriptions": {
                             "typeIdentifier": "t_rational_0_by_1",
@@ -1499,7 +1499,7 @@
                           },
                           "value": "0"
                         },
-                        "src": "1645:17:2",
+                        "src": "1645:17:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -1508,14 +1508,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "64656e6f6d696e6174696f6e2073686f756c642062652067726561746572207468616e2030",
-                        "id": 724,
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                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "1664:39:2",
+                        "src": "1664:39:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_04818fb803bf7e7ff6c9059d97eae335b77b108931ead0a529924d35ccaf3fc8",
@@ -1535,21 +1535,21 @@
                           "typeString": "literal_string \"denomination should be greater than 0\""
                         }
                       ],
-                      "id": 720,
+                      "id": 773,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "1637:7:2",
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+                      "src": "1637:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 725,
+                    "id": 778,
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@@ -1557,34 +1557,34 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "1637:67:2",
+                    "src": "1637:67:3",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
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+                  "src": "1637:67:3"
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                       "name": "verifier",
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                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
@@ -1592,45 +1592,45 @@
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                     "rightHandSide": {
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-                        "typeIdentifier": "t_contract$_IVerifier_$648",
+                        "typeIdentifier": "t_contract$_IVerifier_$701",
                         "typeString": "contract IVerifier"
                       }
                     },
-                    "src": "1710:20:2",
+                    "src": "1710:20:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
                     }
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                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
@@ -1638,43 +1638,43 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
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                       "name": "_feeManager",
                       "nodeType": "Identifier",
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                       "typeDescriptions": {
-                        "typeIdentifier": "t_contract$_IFeeManager_$654",
+                        "typeIdentifier": "t_contract$_IFeeManager_$707",
                         "typeString": "contract IFeeManager"
                       }
                     },
-                    "src": "1736:24:2",
+                    "src": "1736:24:3",
                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
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                     "leftHandSide": {
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                       "name": "operator",
                       "nodeType": "Identifier",
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-                      "referencedDeclaration": 674,
-                      "src": "1766:8:2",
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+                      "src": "1766:8:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
@@ -1684,43 +1684,43 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 736,
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                       "name": "_operator",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 714,
-                      "src": "1777:9:2",
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+                      "src": "1777:9:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_address",
                         "typeString": "address"
                       }
                     },
-                    "src": "1766:20:2",
+                    "src": "1766:20:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
                       "typeString": "address"
                     }
                   },
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+                  "id": 791,
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                     "leftHandSide": {
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                       "name": "denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 660,
-                      "src": "1792:12:2",
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+                      "src": "1792:12:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
@@ -1730,31 +1730,31 @@
                     "operator": "=",
                     "rightHandSide": {
                       "argumentTypes": null,
-                      "id": 740,
+                      "id": 793,
                       "name": "_denomination",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
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-                      "src": "1807:13:2",
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                       "typeDescriptions": {
                         "typeIdentifier": "t_uint256",
                         "typeString": "uint256"
                       }
                     },
-                    "src": "1792:28:2",
+                    "src": "1792:28:3",
                     "typeDescriptions": {
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                       "typeString": "uint256"
                     }
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                   "nodeType": "ExpressionStatement",
-                  "src": "1792:28:2"
+                  "src": "1792:28:3"
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               ]
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             "documentation": "@dev The constructor\n@param _verifier the address of SNARK verifier for this contract\n@param _denomination transfer amount for each deposit\n@param _merkleTreeHeight the height of deposits' Merkle Tree\n@param _operator operator address (see operator comment above)",
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+            "id": 797,
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@@ -1762,64 +1762,64 @@
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                     "name": "_merkleTreeHeight",
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-                    "src": "1605:17:2",
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                       "typeString": "uint32"
                     }
                   }
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-                "id": 718,
+                "id": 771,
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-                  "id": 716,
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                   "name": "MerkleTreeWithHistory",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 632,
-                  "src": "1583:21:2",
+                  "referencedDeclaration": 685,
+                  "src": "1583:21:3",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$632_$",
+                    "typeIdentifier": "t_type$_t_contract$_MerkleTreeWithHistory_$685_$",
                     "typeString": "type(contract MerkleTreeWithHistory)"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               }
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             "nodeType": "FunctionDefinition",
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+              "id": 768,
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+                  "id": 759,
                   "name": "_verifier",
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-                  "src": "1450:19:2",
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+                  "src": "1450:19:3",
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                   "storageLocation": "default",
                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IVerifier_$648",
+                    "typeIdentifier": "t_contract$_IVerifier_$701",
                     "typeString": "contract IVerifier"
                   },
                   "typeName": {
                     "contractScope": null,
-                    "id": 705,
+                    "id": 758,
                     "name": "IVerifier",
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-                    "src": "1450:9:2",
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+                    "src": "1450:9:3",
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-                      "typeIdentifier": "t_contract$_IVerifier_$648",
+                      "typeIdentifier": "t_contract$_IVerifier_$701",
                       "typeString": "contract IVerifier"
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@@ -1828,26 +1828,26 @@
                 },
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                   "constant": false,
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+                  "id": 761,
                   "name": "_feeManager",
                   "nodeType": "VariableDeclaration",
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                   "typeDescriptions": {
-                    "typeIdentifier": "t_contract$_IFeeManager_$654",
+                    "typeIdentifier": "t_contract$_IFeeManager_$707",
                     "typeString": "contract IFeeManager"
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                     "name": "IFeeManager",
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-                    "src": "1475:11:2",
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                     "typeDescriptions": {
-                      "typeIdentifier": "t_contract$_IFeeManager_$654",
+                      "typeIdentifier": "t_contract$_IFeeManager_$707",
                       "typeString": "contract IFeeManager"
                     }
                   },
@@ -1856,11 +1856,11 @@
                 },
                 {
                   "constant": false,
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+                  "id": 763,
                   "name": "_denomination",
                   "nodeType": "VariableDeclaration",
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-                  "src": "1504:21:2",
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@@ -1868,10 +1868,10 @@
                     "typeString": "uint256"
                   },
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+                    "id": 762,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1504:7:2",
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                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -1882,11 +1882,11 @@
                 },
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                   "name": "_merkleTreeHeight",
                   "nodeType": "VariableDeclaration",
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-                  "src": "1531:24:2",
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@@ -1894,10 +1894,10 @@
                     "typeString": "uint32"
                   },
                   "typeName": {
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+                    "id": 764,
                     "name": "uint32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1531:6:2",
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                       "typeIdentifier": "t_uint32",
                       "typeString": "uint32"
@@ -1908,11 +1908,11 @@
                 },
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                   "name": "_operator",
                   "nodeType": "VariableDeclaration",
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-                  "src": "1561:17:2",
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                   "typeDescriptions": {
@@ -1920,10 +1920,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 713,
+                    "id": 766,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "1561:7:2",
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                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -1934,25 +1934,25 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "1444:138:2"
+              "src": "1444:138:3"
             },
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+              "id": 772,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "1631:0:2"
+              "src": "1631:0:3"
             },
-            "scope": 970,
-            "src": "1433:392:2",
+            "scope": 1023,
+            "src": "1433:392:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "public"
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-              "id": 781,
+              "id": 834,
               "nodeType": "Block",
-              "src": "2141:256:2",
+              "src": "2141:256:3",
               "statements": [
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@@ -1960,7 +1960,7 @@
                     "arguments": [
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@@ -1968,31 +1968,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "2155:25:2",
+                        "src": "2155:25:3",
                         "subExpression": {
                           "argumentTypes": null,
                           "baseExpression": {
                             "argumentTypes": null,
-                            "id": 752,
+                            "id": 805,
                             "name": "commitments",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 668,
-                            "src": "2156:11:2",
+                            "referencedDeclaration": 721,
+                            "src": "2156:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
-                          "id": 754,
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                           "indexExpression": {
                             "argumentTypes": null,
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+                            "id": 806,
                             "name": "_commitment",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 746,
-                            "src": "2168:11:2",
+                            "referencedDeclaration": 799,
+                            "src": "2168:11:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2003,7 +2003,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "2156:24:2",
+                          "src": "2156:24:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
@@ -2017,14 +2017,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "54686520636f6d6d69746d656e7420686173206265656e207375626d6974746564",
-                        "id": 756,
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                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "2182:35:2",
+                        "src": "2182:35:3",
                         "subdenomination": null,
                         "typeDescriptions": {
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@@ -2044,21 +2044,21 @@
                           "typeString": "literal_string \"The commitment has been submitted\""
                         }
                       ],
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+                      "id": 804,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
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+                        1071,
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                       ],
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-                      "src": "2147:7:2",
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                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 757,
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@@ -2066,28 +2066,28 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2147:71:2",
+                    "src": "2147:71:3",
                     "typeDescriptions": {
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                       "typeString": "tuple()"
                     }
                   },
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                       "name": "insertedIndex",
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-                      "src": "2225:20:2",
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+                      "src": "2225:20:3",
                       "stateVariable": false,
                       "storageLocation": "default",
                       "typeDescriptions": {
@@ -2095,10 +2095,10 @@
                         "typeString": "uint32"
                       },
                       "typeName": {
-                        "id": 759,
+                        "id": 812,
                         "name": "uint32",
                         "nodeType": "ElementaryTypeName",
-                        "src": "2225:6:2",
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                         "typeDescriptions": {
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                           "typeString": "uint32"
@@ -2108,18 +2108,18 @@
                       "visibility": "internal"
                     }
                   ],
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                   "initialValue": {
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                       {
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                         "name": "_commitment",
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                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2256:11:2",
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                         "typeDescriptions": {
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                           "typeString": "bytes32"
@@ -2133,18 +2133,18 @@
                           "typeString": "bytes32"
                         }
                       ],
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-                      "src": "2248:7:2",
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                         "typeString": "function (bytes32) returns (uint32)"
                       }
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@@ -2152,19 +2152,19 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2248:20:2",
+                    "src": "2248:20:3",
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                       "typeString": "uint32"
                     }
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-                  "src": "2225:43:2"
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@@ -2173,26 +2173,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 765,
+                        "id": 818,
                         "name": "commitments",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 668,
-                        "src": "2274:11:2",
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                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
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-                      "id": 767,
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                       "indexExpression": {
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                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2286:11:2",
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                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2203,7 +2203,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "2274:24:2",
+                      "src": "2274:24:3",
                       "typeDescriptions": {
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                         "typeString": "bool"
@@ -2214,14 +2214,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
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                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "2301:4:2",
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                       "subdenomination": null,
                       "typeDescriptions": {
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@@ -2229,15 +2229,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "2274:31:2",
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                       "typeString": "bool"
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+                  "src": "2274:31:3"
                 },
                 {
                   "expression": {
@@ -2245,18 +2245,18 @@
                     "arguments": [],
                     "expression": {
                       "argumentTypes": [],
-                      "id": 771,
+                      "id": 824,
                       "name": "_processDeposit",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 785,
-                      "src": "2311:15:2",
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+                      "src": "2311:15:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$__$returns$__$",
                         "typeString": "function ()"
                       }
                     },
-                    "id": 772,
+                    "id": 825,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2264,15 +2264,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2311:17:2",
+                    "src": "2311:17:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
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                   "nodeType": "ExpressionStatement",
-                  "src": "2311:17:2"
+                  "src": "2311:17:3"
                 },
                 {
                   "eventCall": {
@@ -2280,12 +2280,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 775,
+                        "id": 828,
                         "name": "_commitment",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 746,
-                        "src": "2348:11:2",
+                        "referencedDeclaration": 799,
+                        "src": "2348:11:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -2293,12 +2293,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 776,
+                        "id": 829,
                         "name": "insertedIndex",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 760,
-                        "src": "2361:13:2",
+                        "referencedDeclaration": 813,
+                        "src": "2361:13:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint32",
                           "typeString": "uint32"
@@ -2308,18 +2308,18 @@
                         "argumentTypes": null,
                         "expression": {
                           "argumentTypes": null,
-                          "id": 777,
+                          "id": 830,
                           "name": "block",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 1005,
-                          "src": "2376:5:2",
+                          "referencedDeclaration": 1058,
+                          "src": "2376:5:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_magic_block",
                             "typeString": "block"
                           }
                         },
-                        "id": 778,
+                        "id": 831,
                         "isConstant": false,
                         "isLValue": false,
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@@ -2327,7 +2327,7 @@
                         "memberName": "timestamp",
                         "nodeType": "MemberAccess",
                         "referencedDeclaration": null,
-                        "src": "2376:15:2",
+                        "src": "2376:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -2349,18 +2349,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 774,
+                      "id": 827,
                       "name": "Deposit",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 694,
-                      "src": "2340:7:2",
+                      "referencedDeclaration": 747,
+                      "src": "2340:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_bytes32_$_t_uint32_$_t_uint256_$returns$__$",
                         "typeString": "function (bytes32,uint32,uint256)"
                       }
                     },
-                    "id": 779,
+                    "id": 832,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2368,56 +2368,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "2340:52:2",
+                    "src": "2340:52:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 780,
+                  "id": 833,
                   "nodeType": "EmitStatement",
-                  "src": "2335:57:2"
+                  "src": "2335:57:3"
                 }
               ]
             },
             "documentation": "@dev Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.\n@param _commitment the note commitment, which is PedersenHash(nullifier + secret)",
-            "id": 782,
+            "id": 835,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 749,
+                "id": 802,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 748,
+                  "id": 801,
                   "name": "nonReentrant",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 999,
-                  "src": "2128:12:2",
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+                  "src": "2128:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               }
             ],
             "name": "deposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 747,
+              "id": 800,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 746,
+                  "id": 799,
                   "name": "_commitment",
                   "nodeType": "VariableDeclaration",
-                  "scope": 782,
-                  "src": "2090:19:2",
+                  "scope": 835,
+                  "src": "2090:19:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -2425,10 +2425,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 745,
+                    "id": 798,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2090:7:2",
+                    "src": "2090:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -2438,16 +2438,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2089:21:2"
+              "src": "2089:21:3"
             },
             "returnParameters": {
-              "id": 750,
+              "id": 803,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "2141:0:2"
+              "src": "2141:0:3"
             },
-            "scope": 970,
-            "src": "2073:324:2",
+            "scope": 1023,
+            "src": "2073:324:3",
             "stateMutability": "payable",
             "superFunction": null,
             "visibility": "external"
@@ -2455,35 +2455,35 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 785,
+            "id": 838,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processDeposit",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 783,
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               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "2484:2:2"
+              "src": "2484:2:3"
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               "nodeType": "ParameterList",
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-              "src": "2495:0:2"
+              "src": "2495:0:3"
             },
-            "scope": 970,
-            "src": "2460:36:2",
+            "scope": 1023,
+            "src": "2460:36:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "internal"
           },
           {
             "body": {
-              "id": 872,
+              "id": 925,
               "nodeType": "Block",
-              "src": "3088:606:2",
+              "src": "3088:606:3",
               "statements": [
                 {
                   "expression": {
@@ -2495,19 +2495,19 @@
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
                         },
-                        "id": 807,
+                        "id": 860,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
                         "lValueRequested": false,
                         "leftExpression": {
                           "argumentTypes": null,
-                          "id": 805,
+                          "id": 858,
                           "name": "_fee",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 797,
-                          "src": "3102:4:2",
+                          "referencedDeclaration": 850,
+                          "src": "3102:4:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -2517,18 +2517,18 @@
                         "operator": "<=",
                         "rightExpression": {
                           "argumentTypes": null,
-                          "id": 806,
+                          "id": 859,
                           "name": "denomination",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 660,
-                          "src": "3110:12:2",
+                          "referencedDeclaration": 713,
+                          "src": "3110:12:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
                           }
                         },
-                        "src": "3102:20:2",
+                        "src": "3102:20:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2537,14 +2537,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "4665652065786365656473207472616e736665722076616c7565",
-                        "id": 808,
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                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3124:28:2",
+                        "src": "3124:28:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2ce218df547d416f80ea8a5deadaf9453d23523ffa5f2e880a48adfdb4053a9c",
@@ -2564,21 +2564,21 @@
                           "typeString": "literal_string \"Fee exceeds transfer value\""
                         }
                       ],
-                      "id": 804,
+                      "id": 857,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
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+                        1071,
+                        1072
                       ],
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-                      "src": "3094:7:2",
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+                      "src": "3094:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 809,
+                    "id": 862,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -2586,15 +2586,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3094:59:2",
+                    "src": "3094:59:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 810,
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                   "nodeType": "ExpressionStatement",
-                  "src": "3094:59:2"
+                  "src": "3094:59:3"
                 },
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@@ -2602,7 +2602,7 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 815,
+                        "id": 868,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -2610,31 +2610,31 @@
                         "nodeType": "UnaryOperation",
                         "operator": "!",
                         "prefix": true,
-                        "src": "3167:32:2",
+                        "src": "3167:32:3",
                         "subExpression": {
                           "argumentTypes": null,
                           "baseExpression": {
                             "argumentTypes": null,
-                            "id": 812,
+                            "id": 865,
                             "name": "nullifierHashes",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 664,
-                            "src": "3168:15:2",
+                            "referencedDeclaration": 717,
+                            "src": "3168:15:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                               "typeString": "mapping(bytes32 => bool)"
                             }
                           },
-                          "id": 814,
+                          "id": 867,
                           "indexExpression": {
                             "argumentTypes": null,
-                            "id": 813,
+                            "id": 866,
                             "name": "_nullifierHash",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 791,
-                            "src": "3184:14:2",
+                            "referencedDeclaration": 844,
+                            "src": "3184:14:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2645,7 +2645,7 @@
                           "isPure": false,
                           "lValueRequested": false,
                           "nodeType": "IndexAccess",
-                          "src": "3168:31:2",
+                          "src": "3168:31:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
@@ -2659,14 +2659,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "546865206e6f746520686173206265656e20616c7265616479207370656e74",
-                        "id": 816,
+                        "id": 869,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3201:33:2",
+                        "src": "3201:33:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_a1bef92d7a18b1c6975dc8de68df6140a52afea05a2c6c91da2b1562c617e896",
@@ -2686,21 +2686,21 @@
                           "typeString": "literal_string \"The note has been already spent\""
                         }
                       ],
-                      "id": 811,
+                      "id": 864,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
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-                    "id": 817,
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@@ -2708,15 +2708,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3159:76:2",
+                    "src": "3159:76:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
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+                  "id": 871,
                   "nodeType": "ExpressionStatement",
-                  "src": "3159:76:2"
+                  "src": "3159:76:3"
                 },
                 {
                   "expression": {
@@ -2727,12 +2727,12 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 821,
+                            "id": 874,
                             "name": "_root",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 789,
-                            "src": "3261:5:2",
+                            "referencedDeclaration": 842,
+                            "src": "3261:5:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes32",
                               "typeString": "bytes32"
@@ -2746,18 +2746,18 @@
                               "typeString": "bytes32"
                             }
                           ],
-                          "id": 820,
+                          "id": 873,
                           "name": "isKnownRoot",
                           "nodeType": "Identifier",
                           "overloadedDeclarations": [],
-                          "referencedDeclaration": 621,
-                          "src": "3249:11:2",
+                          "referencedDeclaration": 674,
+                          "src": "3249:11:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_bool_$",
                             "typeString": "function (bytes32) view returns (bool)"
                           }
                         },
-                        "id": 822,
+                        "id": 875,
                         "isConstant": false,
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                         "isPure": false,
@@ -2765,7 +2765,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3249:18:2",
+                        "src": "3249:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -2774,14 +2774,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "43616e6e6f742066696e6420796f7572206d65726b6c6520726f6f74",
-                        "id": 823,
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                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3269:30:2",
+                        "src": "3269:30:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_2a69086763073955418d2fd7dfee3d2f1fbc5b21047a216b7855d3f313d8e204",
@@ -2801,21 +2801,21 @@
                           "typeString": "literal_string \"Cannot find your merkle root\""
                         }
                       ],
-                      "id": 819,
+                      "id": 872,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
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-                      "src": "3241:7:2",
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+                      "src": "3241:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 824,
+                    "id": 877,
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                     "isPure": false,
@@ -2823,15 +2823,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3241:59:2",
+                    "src": "3241:59:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
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                   "nodeType": "ExpressionStatement",
-                  "src": "3241:59:2"
+                  "src": "3241:59:3"
                 },
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@@ -2842,12 +2842,12 @@
                         "arguments": [
                           {
                             "argumentTypes": null,
-                            "id": 829,
+                            "id": 882,
                             "name": "_proof",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 787,
-                            "src": "3368:6:2",
+                            "referencedDeclaration": 840,
+                            "src": "3368:6:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bytes_calldata_ptr",
                               "typeString": "bytes calldata"
@@ -2861,12 +2861,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 831,
+                                    "id": 884,
                                     "name": "_root",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 789,
-                                    "src": "3385:5:2",
+                                    "referencedDeclaration": 842,
+                                    "src": "3385:5:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2880,20 +2880,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
-                                  "id": 830,
+                                  "id": 883,
                                   "isConstant": false,
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                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3377:7:2",
+                                  "src": "3377:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 832,
+                                "id": 885,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2901,7 +2901,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3377:14:2",
+                                "src": "3377:14:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2912,12 +2912,12 @@
                                 "arguments": [
                                   {
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-                                    "id": 834,
+                                    "id": 887,
                                     "name": "_nullifierHash",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 791,
-                                    "src": "3401:14:2",
+                                    "referencedDeclaration": 844,
+                                    "src": "3401:14:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_bytes32",
                                       "typeString": "bytes32"
@@ -2931,20 +2931,20 @@
                                       "typeString": "bytes32"
                                     }
                                   ],
-                                  "id": 833,
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                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3393:7:2",
+                                  "src": "3393:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 835,
+                                "id": 888,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -2952,7 +2952,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3393:23:2",
+                                "src": "3393:23:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -2963,12 +2963,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 837,
+                                    "id": 890,
                                     "name": "_recipient",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 793,
-                                    "src": "3426:10:2",
+                                    "referencedDeclaration": 846,
+                                    "src": "3426:10:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -2982,20 +2982,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
-                                  "id": 836,
+                                  "id": 889,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3418:7:2",
+                                  "src": "3418:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 838,
+                                "id": 891,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -3003,7 +3003,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3418:19:2",
+                                "src": "3418:19:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -3014,12 +3014,12 @@
                                 "arguments": [
                                   {
                                     "argumentTypes": null,
-                                    "id": 840,
+                                    "id": 893,
                                     "name": "_relayer",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 795,
-                                    "src": "3447:8:2",
+                                    "referencedDeclaration": 848,
+                                    "src": "3447:8:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_address_payable",
                                       "typeString": "address payable"
@@ -3033,20 +3033,20 @@
                                       "typeString": "address payable"
                                     }
                                   ],
-                                  "id": 839,
+                                  "id": 892,
                                   "isConstant": false,
                                   "isLValue": false,
                                   "isPure": true,
                                   "lValueRequested": false,
                                   "nodeType": "ElementaryTypeNameExpression",
-                                  "src": "3439:7:2",
+                                  "src": "3439:7:3",
                                   "typeDescriptions": {
                                     "typeIdentifier": "t_type$_t_uint256_$",
                                     "typeString": "type(uint256)"
                                   },
                                   "typeName": "uint256"
                                 },
-                                "id": 841,
+                                "id": 894,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -3054,7 +3054,7 @@
                                 "lValueRequested": false,
                                 "names": [],
                                 "nodeType": "FunctionCall",
-                                "src": "3439:17:2",
+                                "src": "3439:17:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -3062,12 +3062,12 @@
                               },
                               {
                                 "argumentTypes": null,
-                                "id": 842,
+                                "id": 895,
                                 "name": "_fee",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 797,
-                                "src": "3458:4:2",
+                                "referencedDeclaration": 850,
+                                "src": "3458:4:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -3075,26 +3075,26 @@
                               },
                               {
                                 "argumentTypes": null,
-                                "id": 843,
+                                "id": 896,
                                 "name": "_refund",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 799,
-                                "src": "3464:7:2",
+                                "referencedDeclaration": 852,
+                                "src": "3464:7:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
                                 }
                               }
                             ],
-                            "id": 844,
+                            "id": 897,
                             "isConstant": false,
                             "isInlineArray": true,
                             "isLValue": false,
                             "isPure": false,
                             "lValueRequested": false,
                             "nodeType": "TupleExpression",
-                            "src": "3376:96:2",
+                            "src": "3376:96:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_array$_t_uint256_$6_memory_ptr",
                               "typeString": "uint256[6] memory"
@@ -3114,32 +3114,32 @@
                           ],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 827,
+                            "id": 880,
                             "name": "verifier",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 670,
-                            "src": "3347:8:2",
+                            "referencedDeclaration": 723,
+                            "src": "3347:8:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IVerifier_$648",
+                              "typeIdentifier": "t_contract$_IVerifier_$701",
                               "typeString": "contract IVerifier"
                             }
                           },
-                          "id": 828,
+                          "id": 881,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "verifyProof",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 647,
-                          "src": "3347:20:2",
+                          "referencedDeclaration": 700,
+                          "src": "3347:20:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_nonpayable$_t_bytes_memory_ptr_$_t_array$_t_uint256_$6_memory_ptr_$returns$_t_bool_$",
                             "typeString": "function (bytes memory,uint256[6] memory) external returns (bool)"
                           }
                         },
-                        "id": 845,
+                        "id": 898,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -3147,7 +3147,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3347:126:2",
+                        "src": "3347:126:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bool",
                           "typeString": "bool"
@@ -3156,14 +3156,14 @@
                       {
                         "argumentTypes": null,
                         "hexValue": "496e76616c69642077697468647261772070726f6f66",
-                        "id": 846,
+                        "id": 899,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "kind": "string",
                         "lValueRequested": false,
                         "nodeType": "Literal",
-                        "src": "3475:24:2",
+                        "src": "3475:24:3",
                         "subdenomination": null,
                         "typeDescriptions": {
                           "typeIdentifier": "t_stringliteral_7021ea58137dba96e572e94936410b0b0e4cbc344e1ab2ee7f47660768b81ff4",
@@ -3183,21 +3183,21 @@
                           "typeString": "literal_string \"Invalid withdraw proof\""
                         }
                       ],
-                      "id": 826,
+                      "id": 879,
                       "name": "require",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [
-                        1018,
-                        1019
+                        1071,
+                        1072
                       ],
-                      "referencedDeclaration": 1019,
-                      "src": "3339:7:2",
+                      "referencedDeclaration": 1072,
+                      "src": "3339:7:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_require_pure$_t_bool_$_t_string_memory_ptr_$returns$__$",
                         "typeString": "function (bool,string memory) pure"
                       }
                     },
-                    "id": 847,
+                    "id": 900,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3205,20 +3205,20 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3339:161:2",
+                    "src": "3339:161:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 848,
+                  "id": 901,
                   "nodeType": "ExpressionStatement",
-                  "src": "3339:161:2"
+                  "src": "3339:161:3"
                 },
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 853,
+                    "id": 906,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3227,26 +3227,26 @@
                       "argumentTypes": null,
                       "baseExpression": {
                         "argumentTypes": null,
-                        "id": 849,
+                        "id": 902,
                         "name": "nullifierHashes",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 664,
-                        "src": "3507:15:2",
+                        "referencedDeclaration": 717,
+                        "src": "3507:15:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                           "typeString": "mapping(bytes32 => bool)"
                         }
                       },
-                      "id": 851,
+                      "id": 904,
                       "indexExpression": {
                         "argumentTypes": null,
-                        "id": 850,
+                        "id": 903,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3523:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3523:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -3257,7 +3257,7 @@
                       "isPure": false,
                       "lValueRequested": true,
                       "nodeType": "IndexAccess",
-                      "src": "3507:31:2",
+                      "src": "3507:31:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
                         "typeString": "bool"
@@ -3268,14 +3268,14 @@
                     "rightHandSide": {
                       "argumentTypes": null,
                       "hexValue": "74727565",
-                      "id": 852,
+                      "id": 905,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": true,
                       "kind": "bool",
                       "lValueRequested": false,
                       "nodeType": "Literal",
-                      "src": "3541:4:2",
+                      "src": "3541:4:3",
                       "subdenomination": null,
                       "typeDescriptions": {
                         "typeIdentifier": "t_bool",
@@ -3283,15 +3283,15 @@
                       },
                       "value": "true"
                     },
-                    "src": "3507:38:2",
+                    "src": "3507:38:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "id": 854,
+                  "id": 907,
                   "nodeType": "ExpressionStatement",
-                  "src": "3507:38:2"
+                  "src": "3507:38:3"
                 },
                 {
                   "expression": {
@@ -3299,12 +3299,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 856,
+                        "id": 909,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3568:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3568:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -3312,12 +3312,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 857,
+                        "id": 910,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3580:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3580:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -3325,12 +3325,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 858,
+                        "id": 911,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3590:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3590:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -3338,12 +3338,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 859,
+                        "id": 912,
                         "name": "_refund",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 799,
-                        "src": "3596:7:2",
+                        "referencedDeclaration": 852,
+                        "src": "3596:7:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -3356,32 +3356,32 @@
                           "argumentTypes": [],
                           "expression": {
                             "argumentTypes": null,
-                            "id": 860,
+                            "id": 913,
                             "name": "feeManager",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 672,
-                            "src": "3605:10:2",
+                            "referencedDeclaration": 725,
+                            "src": "3605:10:3",
                             "typeDescriptions": {
-                              "typeIdentifier": "t_contract$_IFeeManager_$654",
+                              "typeIdentifier": "t_contract$_IFeeManager_$707",
                               "typeString": "contract IFeeManager"
                             }
                           },
-                          "id": 861,
+                          "id": 914,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
                           "lValueRequested": false,
                           "memberName": "feeTo",
                           "nodeType": "MemberAccess",
-                          "referencedDeclaration": 653,
-                          "src": "3605:16:2",
+                          "referencedDeclaration": 706,
+                          "src": "3605:16:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_function_external_view$__$returns$_t_address_$",
                             "typeString": "function () view external returns (address)"
                           }
                         },
-                        "id": 862,
+                        "id": 915,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": false,
@@ -3389,7 +3389,7 @@
                         "lValueRequested": false,
                         "names": [],
                         "nodeType": "FunctionCall",
-                        "src": "3605:18:2",
+                        "src": "3605:18:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address",
                           "typeString": "address"
@@ -3419,18 +3419,18 @@
                           "typeString": "address"
                         }
                       ],
-                      "id": 855,
+                      "id": 908,
                       "name": "_processWithdraw",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 886,
-                      "src": "3551:16:2",
+                      "referencedDeclaration": 939,
+                      "src": "3551:16:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_internal_nonpayable$_t_address_payable_$_t_address_payable_$_t_uint256_$_t_uint256_$_t_address_$returns$__$",
                         "typeString": "function (address payable,address payable,uint256,uint256,address)"
                       }
                     },
-                    "id": 863,
+                    "id": 916,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3438,15 +3438,15 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3551:73:2",
+                    "src": "3551:73:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 864,
+                  "id": 917,
                   "nodeType": "ExpressionStatement",
-                  "src": "3551:73:2"
+                  "src": "3551:73:3"
                 },
                 {
                   "eventCall": {
@@ -3454,12 +3454,12 @@
                     "arguments": [
                       {
                         "argumentTypes": null,
-                        "id": 866,
+                        "id": 919,
                         "name": "_recipient",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 793,
-                        "src": "3646:10:2",
+                        "referencedDeclaration": 846,
+                        "src": "3646:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -3467,12 +3467,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 867,
+                        "id": 920,
                         "name": "_nullifierHash",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 791,
-                        "src": "3658:14:2",
+                        "referencedDeclaration": 844,
+                        "src": "3658:14:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_bytes32",
                           "typeString": "bytes32"
@@ -3480,12 +3480,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 868,
+                        "id": 921,
                         "name": "_relayer",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 795,
-                        "src": "3674:8:2",
+                        "referencedDeclaration": 848,
+                        "src": "3674:8:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_address_payable",
                           "typeString": "address payable"
@@ -3493,12 +3493,12 @@
                       },
                       {
                         "argumentTypes": null,
-                        "id": 869,
+                        "id": 922,
                         "name": "_fee",
                         "nodeType": "Identifier",
                         "overloadedDeclarations": [],
-                        "referencedDeclaration": 797,
-                        "src": "3684:4:2",
+                        "referencedDeclaration": 850,
+                        "src": "3684:4:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_uint256",
                           "typeString": "uint256"
@@ -3524,18 +3524,18 @@
                           "typeString": "uint256"
                         }
                       ],
-                      "id": 865,
+                      "id": 918,
                       "name": "Withdrawal",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 704,
-                      "src": "3635:10:2",
+                      "referencedDeclaration": 757,
+                      "src": "3635:10:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_function_event_nonpayable$_t_address_$_t_bytes32_$_t_address_$_t_uint256_$returns$__$",
                         "typeString": "function (address,bytes32,address,uint256)"
                       }
                     },
-                    "id": 870,
+                    "id": 923,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
@@ -3543,56 +3543,56 @@
                     "lValueRequested": false,
                     "names": [],
                     "nodeType": "FunctionCall",
-                    "src": "3635:54:2",
+                    "src": "3635:54:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_tuple$__$",
                       "typeString": "tuple()"
                     }
                   },
-                  "id": 871,
+                  "id": 924,
                   "nodeType": "EmitStatement",
-                  "src": "3630:59:2"
+                  "src": "3630:59:3"
                 }
               ]
             },
             "documentation": "@dev Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs\n`input` array consists of:\n- merkle root of all deposits in the contract\n- hash of unique deposit nullifier to prevent double spends\n- the recipient of funds\n- optional fee that goes to the transaction sender (usually a relay)",
-            "id": 873,
+            "id": 926,
             "implemented": true,
             "kind": "function",
             "modifiers": [
               {
                 "arguments": null,
-                "id": 802,
+                "id": 855,
                 "modifierName": {
                   "argumentTypes": null,
-                  "id": 801,
+                  "id": 854,
                   "name": "nonReentrant",
                   "nodeType": "Identifier",
                   "overloadedDeclarations": [],
-                  "referencedDeclaration": 999,
-                  "src": "3075:12:2",
+                  "referencedDeclaration": 1052,
+                  "src": "3075:12:3",
                   "typeDescriptions": {
                     "typeIdentifier": "t_modifier$__$",
                     "typeString": "modifier ()"
                   }
                 },
                 "nodeType": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               }
             ],
             "name": "withdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 800,
+              "id": 853,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 787,
+                  "id": 840,
                   "name": "_proof",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2911:21:2",
+                  "scope": 926,
+                  "src": "2911:21:3",
                   "stateVariable": false,
                   "storageLocation": "calldata",
                   "typeDescriptions": {
@@ -3600,10 +3600,10 @@
                     "typeString": "bytes"
                   },
                   "typeName": {
-                    "id": 786,
+                    "id": 839,
                     "name": "bytes",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2911:5:2",
+                    "src": "2911:5:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes_storage_ptr",
                       "typeString": "bytes"
@@ -3614,11 +3614,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 789,
+                  "id": 842,
                   "name": "_root",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2934:13:2",
+                  "scope": 926,
+                  "src": "2934:13:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3626,10 +3626,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 788,
+                    "id": 841,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2934:7:2",
+                    "src": "2934:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3640,11 +3640,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 791,
+                  "id": 844,
                   "name": "_nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2949:22:2",
+                  "scope": 926,
+                  "src": "2949:22:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3652,10 +3652,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 790,
+                    "id": 843,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2949:7:2",
+                    "src": "2949:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -3666,11 +3666,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 793,
+                  "id": 846,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "2973:26:2",
+                  "scope": 926,
+                  "src": "2973:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3678,10 +3678,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 792,
+                    "id": 845,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "2973:15:2",
+                    "src": "2973:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3693,11 +3693,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 795,
+                  "id": 848,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3001:24:2",
+                  "scope": 926,
+                  "src": "3001:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3705,10 +3705,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 794,
+                    "id": 847,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3001:15:2",
+                    "src": "3001:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3720,11 +3720,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 797,
+                  "id": 850,
                   "name": "_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3027:12:2",
+                  "scope": 926,
+                  "src": "3027:12:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3732,10 +3732,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 796,
+                    "id": 849,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3027:7:2",
+                    "src": "3027:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3746,11 +3746,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 799,
+                  "id": 852,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 873,
-                  "src": "3041:15:2",
+                  "scope": 926,
+                  "src": "3041:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3758,10 +3758,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 798,
+                    "id": 851,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3041:7:2",
+                    "src": "3041:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3771,16 +3771,16 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "2910:147:2"
+              "src": "2910:147:3"
             },
             "returnParameters": {
-              "id": 803,
+              "id": 856,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "3088:0:2"
+              "src": "3088:0:3"
             },
-            "scope": 970,
-            "src": "2893:801:2",
+            "scope": 1023,
+            "src": "2893:801:3",
             "stateMutability": "payable",
             "superFunction": null,
             "visibility": "external"
@@ -3788,23 +3788,23 @@
           {
             "body": null,
             "documentation": "@dev this function is defined in a child contract ",
-            "id": 886,
+            "id": 939,
             "implemented": false,
             "kind": "function",
             "modifiers": [],
             "name": "_processWithdraw",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 884,
+              "id": 937,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 875,
+                  "id": 928,
                   "name": "_recipient",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3783:26:2",
+                  "scope": 939,
+                  "src": "3783:26:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3812,10 +3812,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 874,
+                    "id": 927,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3783:15:2",
+                    "src": "3783:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3827,11 +3827,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 877,
+                  "id": 930,
                   "name": "_relayer",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3811:24:2",
+                  "scope": 939,
+                  "src": "3811:24:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3839,10 +3839,10 @@
                     "typeString": "address payable"
                   },
                   "typeName": {
-                    "id": 876,
+                    "id": 929,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3811:15:2",
+                    "src": "3811:15:3",
                     "stateMutability": "payable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address_payable",
@@ -3854,11 +3854,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 879,
+                  "id": 932,
                   "name": "_relayer_fee",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3837:20:2",
+                  "scope": 939,
+                  "src": "3837:20:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3866,10 +3866,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 878,
+                    "id": 931,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3837:7:2",
+                    "src": "3837:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3880,11 +3880,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 881,
+                  "id": 934,
                   "name": "_refund",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3859:15:2",
+                  "scope": 939,
+                  "src": "3859:15:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3892,10 +3892,10 @@
                     "typeString": "uint256"
                   },
                   "typeName": {
-                    "id": 880,
+                    "id": 933,
                     "name": "uint256",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3859:7:2",
+                    "src": "3859:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_uint256",
                       "typeString": "uint256"
@@ -3906,11 +3906,11 @@
                 },
                 {
                   "constant": false,
-                  "id": 883,
+                  "id": 936,
                   "name": "_feeTo",
                   "nodeType": "VariableDeclaration",
-                  "scope": 886,
-                  "src": "3876:14:2",
+                  "scope": 939,
+                  "src": "3876:14:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -3918,10 +3918,10 @@
                     "typeString": "address"
                   },
                   "typeName": {
-                    "id": 882,
+                    "id": 935,
                     "name": "address",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3876:7:2",
+                    "src": "3876:7:3",
                     "stateMutability": "nonpayable",
                     "typeDescriptions": {
                       "typeIdentifier": "t_address",
@@ -3932,51 +3932,51 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "3782:109:2"
+              "src": "3782:109:3"
             },
             "returnParameters": {
-              "id": 885,
+              "id": 938,
               "nodeType": "ParameterList",
               "parameters": [],
-              "src": "3900:0:2"
+              "src": "3900:0:3"
             },
-            "scope": 970,
-            "src": "3757:144:2",
+            "scope": 1023,
+            "src": "3757:144:3",
             "stateMutability": "nonpayable",
             "superFunction": null,
             "visibility": "internal"
           },
           {
             "body": {
-              "id": 897,
+              "id": 950,
               "nodeType": "Block",
-              "src": "4018:49:2",
+              "src": "4018:49:3",
               "statements": [
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                   "expression": {
                     "argumentTypes": null,
                     "baseExpression": {
                       "argumentTypes": null,
-                      "id": 893,
+                      "id": 946,
                       "name": "nullifierHashes",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 664,
-                      "src": "4031:15:2",
+                      "referencedDeclaration": 717,
+                      "src": "4031:15:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_mapping$_t_bytes32_$_t_bool_$",
                         "typeString": "mapping(bytes32 => bool)"
                       }
                     },
-                    "id": 895,
+                    "id": 948,
                     "indexExpression": {
                       "argumentTypes": null,
-                      "id": 894,
+                      "id": 947,
                       "name": "_nullifierHash",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 888,
-                      "src": "4047:14:2",
+                      "referencedDeclaration": 941,
+                      "src": "4047:14:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_bytes32",
                         "typeString": "bytes32"
@@ -3987,37 +3987,37 @@
                     "isPure": false,
                     "lValueRequested": false,
                     "nodeType": "IndexAccess",
-                    "src": "4031:31:2",
+                    "src": "4031:31:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
                     }
                   },
-                  "functionReturnParameters": 892,
-                  "id": 896,
+                  "functionReturnParameters": 945,
+                  "id": 949,
                   "nodeType": "Return",
-                  "src": "4024:38:2"
+                  "src": "4024:38:3"
                 }
               ]
             },
             "documentation": "@dev whether a note is already spent ",
-            "id": 898,
+            "id": 951,
             "implemented": true,
             "kind": "function",
             "modifiers": [],
             "name": "isSpent",
             "nodeType": "FunctionDefinition",
             "parameters": {
-              "id": 889,
+              "id": 942,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 888,
+                  "id": 941,
                   "name": "_nullifierHash",
                   "nodeType": "VariableDeclaration",
-                  "scope": 898,
-                  "src": "3968:22:2",
+                  "scope": 951,
+                  "src": "3968:22:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -4025,10 +4025,10 @@
                     "typeString": "bytes32"
                   },
                   "typeName": {
-                    "id": 887,
+                    "id": 940,
                     "name": "bytes32",
                     "nodeType": "ElementaryTypeName",
-                    "src": "3968:7:2",
+                    "src": "3968:7:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bytes32",
                       "typeString": "bytes32"
@@ -4038,19 +4038,19 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "3967:24:2"
+              "src": "3967:24:3"
             },
             "returnParameters": {
-              "id": 892,
+              "id": 945,
               "nodeType": "ParameterList",
               "parameters": [
                 {
                   "constant": false,
-                  "id": 891,
+                  "id": 944,
                   "name": "",
                   "nodeType": "VariableDeclaration",
-                  "scope": 898,
-                  "src": "4012:4:2",
+                  "scope": 951,
+                  "src": "4012:4:3",
                   "stateVariable": false,
                   "storageLocation": "default",
                   "typeDescriptions": {
@@ -4058,10 +4058,10 @@
                     "typeString": "bool"
                   },
                   "typeName": {
-                    "id": 890,
+                    "id": 943,
                     "name": "bool",
                     "nodeType": "ElementaryTypeName",
-                    "src": "4012:4:2",
+                    "src": "4012:4:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_bool",
                       "typeString": "bool"
@@ -4071,36 +4071,36 @@
                   "visibility": "internal"
                 }
               ],
-              "src": "4011:6:2"
+              "src": "4011:6:3"
             },
-            "scope": 970,
-            "src": "3951:116:2",
+            "scope": 1023,
+            "src": "3951:116:3",
             "stateMutability": "view",
             "superFunction": null,
             "visibility": "public"
           },
           {
             "body": {
-              "id": 942,
+              "id": 995,
               "nodeType": "Block",
-              "src": "4230:191:2",
+              "src": "4230:191:3",
               "statements": [
                 {
                   "expression": {
                     "argumentTypes": null,
-                    "id": 914,
+                    "id": 967,
                     "isConstant": false,
                     "isLValue": false,
                     "isPure": false,
                     "lValueRequested": false,
                     "leftHandSide": {
                       "argumentTypes": null,
-                      "id": 907,
+                      "id": 960,
                       "name": "spent",
                       "nodeType": "Identifier",
                       "overloadedDeclarations": [],
-                      "referencedDeclaration": 905,
-                      "src": "4236:5:2",
+                      "referencedDeclaration": 958,
+                      "src": "4236:5:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                         "typeString": "bool[] memory"
@@ -4115,18 +4115,18 @@
                           "argumentTypes": null,
                           "expression": {
                             "argumentTypes": null,
-                            "id": 911,
+                            "id": 964,
                             "name": "_nullifierHashes",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 901,
-                            "src": "4255:16:2",
+                            "referencedDeclaration": 954,
+                            "src": "4255:16:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_array$_t_bytes32_$dyn_calldata_ptr",
                               "typeString": "bytes32[] calldata"
                             }
                           },
-                          "id": 912,
+                          "id": 965,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -4134,7 +4134,7 @@
                           "memberName": "length",
                           "nodeType": "MemberAccess",
                           "referencedDeclaration": null,
-                          "src": "4255:23:2",
+                          "src": "4255:23:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_uint256",
                             "typeString": "uint256"
@@ -4148,39 +4148,39 @@
                             "typeString": "uint256"
                           }
                         ],
-                        "id": 910,
+                        "id": 963,
                         "isConstant": false,
                         "isLValue": false,
                         "isPure": true,
                         "lValueRequested": false,
                         "nodeType": "NewExpression",
-                        "src": "4244:10:2",
+                        "src": "4244:10:3",
                         "typeDescriptions": {
                           "typeIdentifier": "t_function_objectcreation_pure$_t_uint256_$returns$_t_array$_t_bool_$dyn_memory_$",
                           "typeString": "function (uint256) pure returns (bool[] memory)"
                         },
                         "typeName": {
                           "baseType": {
-                            "id": 908,
+                            "id": 961,
                             "name": "bool",
                             "nodeType": "ElementaryTypeName",
-                            "src": "4248:4:2",
+                            "src": "4248:4:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_bool",
                               "typeString": "bool"
                             }
                           },
-                          "id": 909,
+                          "id": 962,
                           "length": null,
                           "nodeType": "ArrayTypeName",
-                          "src": "4248:6:2",
+                          "src": "4248:6:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_array$_t_bool_$dyn_storage_ptr",
                             "typeString": "bool[]"
                           }
                         }
                       },
-                      "id": 913,
+                      "id": 966,
                       "isConstant": false,
                       "isLValue": false,
                       "isPure": false,
@@ -4188,27 +4188,27 @@
                       "lValueRequested": false,
                       "names": [],
                       "nodeType": "FunctionCall",
-                      "src": "4244:35:2",
+                      "src": "4244:35:3",
                       "typeDescriptions": {
                         "typeIdentifier": "t_array$_t_bool_$dyn_memory",
                         "typeString": "bool[] memory"
                       }
                     },
-                    "src": "4236:43:2",
+                    "src": "4236:43:3",
                     "typeDescriptions": {
                       "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                       "typeString": "bool[] memory"
                     }
                   },
-                  "id": 915,
+                  "id": 968,
                   "nodeType": "ExpressionStatement",
-                  "src": "4236:43:2"
+                  "src": "4236:43:3"
                 },
                 {
                   "body": {
-                    "id": 940,
+                    "id": 993,
                     "nodeType": "Block",
-                    "src": "4335:82:2",
+                    "src": "4335:82:3",
                     "statements": [
                       {
                         "condition": {
@@ -4218,26 +4218,26 @@
                               "argumentTypes": null,
                               "baseExpression": {
                                 "argumentTypes": null,
-                                "id": 928,
+                                "id": 981,
                                 "name": "_nullifierHashes",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 901,
-                                "src": "4355:16:2",
+                                "referencedDeclaration": 954,
+                                "src": "4355:16:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_array$_t_bytes32_$dyn_calldata_ptr",
                                   "typeString": "bytes32[] calldata"
                                 }
                               },
-                              "id": 930,
+                              "id": 983,
                               "indexExpression": {
                                 "argumentTypes": null,
-                                "id": 929,
+                                "id": 982,
                                 "name": "i",
                                 "nodeType": "Identifier",
                                 "overloadedDeclarations": [],
-                                "referencedDeclaration": 917,
-                                "src": "4372:1:2",
+                                "referencedDeclaration": 970,
+                                "src": "4372:1:3",
                                 "typeDescriptions": {
                                   "typeIdentifier": "t_uint256",
                                   "typeString": "uint256"
@@ -4248,7 +4248,7 @@
                               "isPure": false,
                               "lValueRequested": false,
                               "nodeType": "IndexAccess",
-                              "src": "4355:19:2",
+                              "src": "4355:19:3",
                               "typeDescriptions": {
                                 "typeIdentifier": "t_bytes32",
                                 "typeString": "bytes32"
@@ -4262,18 +4262,18 @@
                                 "typeString": "bytes32"
                               }
                             ],
-                            "id": 927,
+                            "id": 980,
                             "name": "isSpent",
                             "nodeType": "Identifier",
                             "overloadedDeclarations": [],
-                            "referencedDeclaration": 898,
-                            "src": "4347:7:2",
+                            "referencedDeclaration": 951,
+                            "src": "4347:7:3",
                             "typeDescriptions": {
                               "typeIdentifier": "t_function_internal_view$_t_bytes32_$returns$_t_bool_$",
                               "typeString": "function (bytes32) view returns (bool)"
                             }
                           },
-                          "id": 931,
+                          "id": 984,
                           "isConstant": false,
                           "isLValue": false,
                           "isPure": false,
@@ -4281,25 +4281,25 @@
                           "lValueRequested": false,
                           "names": [],
                           "nodeType": "FunctionCall",
-                          "src": "4347:28:2",
+                          "src": "4347:28:3",
                           "typeDescriptions": {
                             "typeIdentifier": "t_bool",
                             "typeString": "bool"
                           }
                         },
                         "falseBody": null,
-                        "id": 939,
+                        "id": 992,
                         "nodeType": "IfStatement",
-                        "src": "4343:68:2",
+                        "src": "4343:68:3",
                         "trueBody": {
-                          "id": 938,
+                          "id": 991,
                           "nodeType": "Block",
-                          "src": "4377:34:2",
+                          "src": "4377:34:3",
                           "statements": [
                             {
                               "expression": {
                                 "argumentTypes": null,
-                                "id": 936,
+                                "id": 989,
                                 "isConstant": false,
                                 "isLValue": false,
                                 "isPure": false,
@@ -4308,26 +4308,26 @@
                                   "argumentTypes": null,
                                   "baseExpression": {
                                     "argumentTypes": null,
-                                    "id": 932,
+                                    "id": 985,
                                     "name": "spent",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 905,
-                                    "src": "4387:5:2",
+                                    "referencedDeclaration": 958,
+                                    "src": "4387:5:3",
                                     "typeDescriptions": {
                                       "typeIdentifier": "t_array$_t_bool_$dyn_memory_ptr",
                                       "typeString": "bool[] memory"
                                     }
                                   },
-                                  "id": 934,
+                                  "id": 987,
                                   "indexExpression": {
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+                                    "id": 986,
                                     "name": "i",
                                     "nodeType": "Identifier",
                                     "overloadedDeclarations": [],
-                                    "referencedDeclaration": 917,
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                       }
                     ],
-                    "id": 638,
+                    "id": 691,
                     "name": "VariableDeclaration",
-                    "src": "168:19:2"
+                    "src": "168:19:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_input",
-                      "scope": 647,
+                      "scope": 700,
                       "stateVariable": false,
                       "storageLocation": "memory",
                       "type": "uint256[6]",
@@ -5073,9 +5073,9 @@
                               "name": "uint256",
                               "type": "uint256"
                             },
-                            "id": 639,
+                            "id": 692,
                             "name": "ElementaryTypeName",
-                            "src": "189:7:2"
+                            "src": "189:7:3"
                           },
                           {
                             "attributes": {
@@ -5090,24 +5090,24 @@
                               "type": "int_const 6",
                               "value": "6"
                             },
-                            "id": 640,
+                            "id": 693,
                             "name": "Literal",
-                            "src": "197:1:2"
+                            "src": "197:1:3"
                           }
                         ],
-                        "id": 641,
+                        "id": 694,
                         "name": "ArrayTypeName",
-                        "src": "189:10:2"
+                        "src": "189:10:3"
                       }
                     ],
-                    "id": 642,
+                    "id": 695,
                     "name": "VariableDeclaration",
-                    "src": "189:24:2"
+                    "src": "189:24:3"
                   }
                 ],
-                "id": 643,
+                "id": 696,
                 "name": "ParameterList",
-                "src": "167:47:2"
+                "src": "167:47:3"
               },
               {
                 "children": [
@@ -5115,7 +5115,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "",
-                      "scope": 647,
+                      "scope": 700,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bool",
@@ -5128,29 +5128,29 @@
                           "name": "bool",
                           "type": "bool"
                         },
-                        "id": 644,
+                        "id": 697,
                         "name": "ElementaryTypeName",
-                        "src": "230:4:2"
+                        "src": "230:4:3"
                       }
                     ],
-                    "id": 645,
+                    "id": 698,
                     "name": "VariableDeclaration",
-                    "src": "230:4:2"
+                    "src": "230:4:3"
                   }
                 ],
-                "id": 646,
+                "id": 699,
                 "name": "ParameterList",
-                "src": "229:6:2"
+                "src": "229:6:3"
               }
             ],
-            "id": 647,
+            "id": 700,
             "name": "FunctionDefinition",
-            "src": "147:89:2"
+            "src": "147:89:3"
           }
         ],
-        "id": 648,
+        "id": 701,
         "name": "ContractDefinition",
-        "src": "124:114:2"
+        "src": "124:114:3"
       },
       {
         "attributes": {
@@ -5164,10 +5164,10 @@
           "documentation": null,
           "fullyImplemented": false,
           "linearizedBaseContracts": [
-            654
+            707
           ],
           "name": "IFeeManager",
-          "scope": 971
+          "scope": 1024
         },
         "children": [
           {
@@ -5181,7 +5181,7 @@
                 null
               ],
               "name": "feeTo",
-              "scope": 654,
+              "scope": 707,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "external"
@@ -5194,9 +5194,9 @@
                   ]
                 },
                 "children": [],
-                "id": 649,
+                "id": 702,
                 "name": "ParameterList",
-                "src": "279:2:2"
+                "src": "279:2:3"
               },
               {
                 "children": [
@@ -5204,7 +5204,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "",
-                      "scope": 653,
+                      "scope": 706,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5218,46 +5218,46 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 650,
+                        "id": 703,
                         "name": "ElementaryTypeName",
-                        "src": "305:7:2"
+                        "src": "305:7:3"
                       }
                     ],
-                    "id": 651,
+                    "id": 704,
                     "name": "VariableDeclaration",
-                    "src": "305:7:2"
+                    "src": "305:7:3"
                   }
                 ],
-                "id": 652,
+                "id": 705,
                 "name": "ParameterList",
-                "src": "304:9:2"
+                "src": "304:9:3"
               }
             ],
-            "id": 653,
+            "id": 706,
             "name": "FunctionDefinition",
-            "src": "265:49:2"
+            "src": "265:49:3"
           }
         ],
-        "id": 654,
+        "id": 707,
         "name": "ContractDefinition",
-        "src": "240:76:2"
+        "src": "240:76:3"
       },
       {
         "attributes": {
           "contractDependencies": [
-            632,
-            1000
+            685,
+            1053
           ],
           "contractKind": "contract",
           "documentation": null,
           "fullyImplemented": false,
           "linearizedBaseContracts": [
-            970,
-            1000,
-            632
+            1023,
+            1053,
+            685
           ],
           "name": "Tornado",
-          "scope": 971
+          "scope": 1024
         },
         "children": [
           {
@@ -5269,17 +5269,17 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "MerkleTreeWithHistory",
-                  "referencedDeclaration": 632,
+                  "referencedDeclaration": 685,
                   "type": "contract MerkleTreeWithHistory"
                 },
-                "id": 655,
+                "id": 708,
                 "name": "UserDefinedTypeName",
-                "src": "338:21:2"
+                "src": "338:21:3"
               }
             ],
-            "id": 656,
+            "id": 709,
             "name": "InheritanceSpecifier",
-            "src": "338:21:2"
+            "src": "338:21:3"
           },
           {
             "attributes": {
@@ -5290,23 +5290,23 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "ReentrancyGuard",
-                  "referencedDeclaration": 1000,
+                  "referencedDeclaration": 1053,
                   "type": "contract ReentrancyGuard"
                 },
-                "id": 657,
+                "id": 710,
                 "name": "UserDefinedTypeName",
-                "src": "361:15:2"
+                "src": "361:15:3"
               }
             ],
-            "id": 658,
+            "id": 711,
             "name": "InheritanceSpecifier",
-            "src": "361:15:2"
+            "src": "361:15:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "denomination",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "uint256",
@@ -5319,20 +5319,20 @@
                   "name": "uint256",
                   "type": "uint256"
                 },
-                "id": 659,
+                "id": 712,
                 "name": "ElementaryTypeName",
-                "src": "381:7:2"
+                "src": "381:7:3"
               }
             ],
-            "id": 660,
+            "id": 713,
             "name": "VariableDeclaration",
-            "src": "381:27:2"
+            "src": "381:27:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "nullifierHashes",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "mapping(bytes32 => bool)",
@@ -5350,34 +5350,34 @@
                       "name": "bytes32",
                       "type": "bytes32"
                     },
-                    "id": 661,
+                    "id": 714,
                     "name": "ElementaryTypeName",
-                    "src": "420:7:2"
+                    "src": "420:7:3"
                   },
                   {
                     "attributes": {
                       "name": "bool",
                       "type": "bool"
                     },
-                    "id": 662,
+                    "id": 715,
                     "name": "ElementaryTypeName",
-                    "src": "431:4:2"
+                    "src": "431:4:3"
                   }
                 ],
-                "id": 663,
+                "id": 716,
                 "name": "Mapping",
-                "src": "412:24:2"
+                "src": "412:24:3"
               }
             ],
-            "id": 664,
+            "id": 717,
             "name": "VariableDeclaration",
-            "src": "412:47:2"
+            "src": "412:47:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "commitments",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "mapping(bytes32 => bool)",
@@ -5395,34 +5395,34 @@
                       "name": "bytes32",
                       "type": "bytes32"
                     },
-                    "id": 665,
+                    "id": 718,
                     "name": "ElementaryTypeName",
-                    "src": "562:7:2"
+                    "src": "562:7:3"
                   },
                   {
                     "attributes": {
                       "name": "bool",
                       "type": "bool"
                     },
-                    "id": 666,
+                    "id": 719,
                     "name": "ElementaryTypeName",
-                    "src": "573:4:2"
+                    "src": "573:4:3"
                   }
                 ],
-                "id": 667,
+                "id": 720,
                 "name": "Mapping",
-                "src": "554:24:2"
+                "src": "554:24:3"
               }
             ],
-            "id": 668,
+            "id": 721,
             "name": "VariableDeclaration",
-            "src": "554:43:2"
+            "src": "554:43:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "verifier",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "contract IVerifier",
@@ -5434,23 +5434,23 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "IVerifier",
-                  "referencedDeclaration": 648,
+                  "referencedDeclaration": 701,
                   "type": "contract IVerifier"
                 },
-                "id": 669,
+                "id": 722,
                 "name": "UserDefinedTypeName",
-                "src": "601:9:2"
+                "src": "601:9:3"
               }
             ],
-            "id": 670,
+            "id": 723,
             "name": "VariableDeclaration",
-            "src": "601:25:2"
+            "src": "601:25:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "feeManager",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "contract IFeeManager",
@@ -5462,23 +5462,23 @@
                 "attributes": {
                   "contractScope": null,
                   "name": "IFeeManager",
-                  "referencedDeclaration": 654,
+                  "referencedDeclaration": 707,
                   "type": "contract IFeeManager"
                 },
-                "id": 671,
+                "id": 724,
                 "name": "UserDefinedTypeName",
-                "src": "630:11:2"
+                "src": "630:11:3"
               }
             ],
-            "id": 672,
+            "id": 725,
             "name": "VariableDeclaration",
-            "src": "630:29:2"
+            "src": "630:29:3"
           },
           {
             "attributes": {
               "constant": false,
               "name": "operator",
-              "scope": 970,
+              "scope": 1023,
               "stateVariable": true,
               "storageLocation": "default",
               "type": "address",
@@ -5492,14 +5492,14 @@
                   "stateMutability": "nonpayable",
                   "type": "address"
                 },
-                "id": 673,
+                "id": 726,
                 "name": "ElementaryTypeName",
-                "src": "819:7:2"
+                "src": "819:7:3"
               }
             ],
-            "id": 674,
+            "id": 727,
             "name": "VariableDeclaration",
-            "src": "819:23:2"
+            "src": "819:23:3"
           },
           {
             "attributes": {
@@ -5515,9 +5515,9 @@
                   ]
                 },
                 "children": [],
-                "id": 675,
+                "id": 728,
                 "name": "ParameterList",
-                "src": "868:0:2"
+                "src": "868:0:3"
               },
               {
                 "children": [
@@ -5551,16 +5551,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 676,
+                            "id": 729,
                             "name": "Identifier",
-                            "src": "874:7:2"
+                            "src": "874:7:3"
                           },
                           {
                             "attributes": {
@@ -5595,18 +5595,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 1015,
+                                      "referencedDeclaration": 1068,
                                       "type": "msg",
                                       "value": "msg"
                                     },
-                                    "id": 677,
+                                    "id": 730,
                                     "name": "Identifier",
-                                    "src": "882:3:2"
+                                    "src": "882:3:3"
                                   }
                                 ],
-                                "id": 678,
+                                "id": 731,
                                 "name": "MemberAccess",
-                                "src": "882:10:2"
+                                "src": "882:10:3"
                               },
                               {
                                 "attributes": {
@@ -5614,18 +5614,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 674,
+                                  "referencedDeclaration": 727,
                                   "type": "address",
                                   "value": "operator"
                                 },
-                                "id": 679,
+                                "id": 732,
                                 "name": "Identifier",
-                                "src": "896:8:2"
+                                "src": "896:8:3"
                               }
                             ],
-                            "id": 680,
+                            "id": 733,
                             "name": "BinaryOperation",
-                            "src": "882:22:2"
+                            "src": "882:22:3"
                           },
                           {
                             "attributes": {
@@ -5640,34 +5640,34 @@
                               "type": "literal_string \"Only operator can call this function.\"",
                               "value": "Only operator can call this function."
                             },
-                            "id": 681,
+                            "id": 734,
                             "name": "Literal",
-                            "src": "906:39:2"
+                            "src": "906:39:3"
                           }
                         ],
-                        "id": 682,
+                        "id": 735,
                         "name": "FunctionCall",
-                        "src": "874:72:2"
+                        "src": "874:72:3"
                       }
                     ],
-                    "id": 683,
+                    "id": 736,
                     "name": "ExpressionStatement",
-                    "src": "874:72:2"
+                    "src": "874:72:3"
                   },
                   {
-                    "id": 684,
+                    "id": 737,
                     "name": "PlaceholderStatement",
-                    "src": "952:1:2"
+                    "src": "952:1:3"
                   }
                 ],
-                "id": 685,
+                "id": 738,
                 "name": "Block",
-                "src": "868:90:2"
+                "src": "868:90:3"
               }
             ],
-            "id": 686,
+            "id": 739,
             "name": "ModifierDefinition",
-            "src": "846:112:2"
+            "src": "846:112:3"
           },
           {
             "attributes": {
@@ -5683,7 +5683,7 @@
                       "constant": false,
                       "indexed": true,
                       "name": "commitment",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5696,21 +5696,21 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 687,
+                        "id": 740,
                         "name": "ElementaryTypeName",
-                        "src": "976:7:2"
+                        "src": "976:7:3"
                       }
                     ],
-                    "id": 688,
+                    "id": 741,
                     "name": "VariableDeclaration",
-                    "src": "976:26:2"
+                    "src": "976:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "leafIndex",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -5723,21 +5723,21 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 689,
+                        "id": 742,
                         "name": "ElementaryTypeName",
-                        "src": "1004:6:2"
+                        "src": "1004:6:3"
                       }
                     ],
-                    "id": 690,
+                    "id": 743,
                     "name": "VariableDeclaration",
-                    "src": "1004:16:2"
+                    "src": "1004:16:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "timestamp",
-                      "scope": 694,
+                      "scope": 747,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5750,24 +5750,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 691,
+                        "id": 744,
                         "name": "ElementaryTypeName",
-                        "src": "1022:7:2"
+                        "src": "1022:7:3"
                       }
                     ],
-                    "id": 692,
+                    "id": 745,
                     "name": "VariableDeclaration",
-                    "src": "1022:17:2"
+                    "src": "1022:17:3"
                   }
                 ],
-                "id": 693,
+                "id": 746,
                 "name": "ParameterList",
-                "src": "975:65:2"
+                "src": "975:65:3"
               }
             ],
-            "id": 694,
+            "id": 747,
             "name": "EventDefinition",
-            "src": "962:79:2"
+            "src": "962:79:3"
           },
           {
             "attributes": {
@@ -5783,7 +5783,7 @@
                       "constant": false,
                       "indexed": false,
                       "name": "to",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5797,21 +5797,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 695,
+                        "id": 748,
                         "name": "ElementaryTypeName",
-                        "src": "1061:7:2"
+                        "src": "1061:7:3"
                       }
                     ],
-                    "id": 696,
+                    "id": 749,
                     "name": "VariableDeclaration",
-                    "src": "1061:10:2"
+                    "src": "1061:10:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "nullifierHash",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -5824,21 +5824,21 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 697,
+                        "id": 750,
                         "name": "ElementaryTypeName",
-                        "src": "1073:7:2"
+                        "src": "1073:7:3"
                       }
                     ],
-                    "id": 698,
+                    "id": 751,
                     "name": "VariableDeclaration",
-                    "src": "1073:21:2"
+                    "src": "1073:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": true,
                       "name": "relayer",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -5852,21 +5852,21 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 699,
+                        "id": 752,
                         "name": "ElementaryTypeName",
-                        "src": "1096:7:2"
+                        "src": "1096:7:3"
                       }
                     ],
-                    "id": 700,
+                    "id": 753,
                     "name": "VariableDeclaration",
-                    "src": "1096:23:2"
+                    "src": "1096:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "indexed": false,
                       "name": "fee",
-                      "scope": 704,
+                      "scope": 757,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5879,24 +5879,24 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 701,
+                        "id": 754,
                         "name": "ElementaryTypeName",
-                        "src": "1121:7:2"
+                        "src": "1121:7:3"
                       }
                     ],
-                    "id": 702,
+                    "id": 755,
                     "name": "VariableDeclaration",
-                    "src": "1121:11:2"
+                    "src": "1121:11:3"
                   }
                 ],
-                "id": 703,
+                "id": 756,
                 "name": "ParameterList",
-                "src": "1060:73:2"
+                "src": "1060:73:3"
               }
             ],
-            "id": 704,
+            "id": 757,
             "name": "EventDefinition",
-            "src": "1044:90:2"
+            "src": "1044:90:3"
           },
           {
             "attributes": {
@@ -5905,7 +5905,7 @@
               "isConstructor": true,
               "kind": "constructor",
               "name": "",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "public"
@@ -5917,7 +5917,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_verifier",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IVerifier",
@@ -5929,23 +5929,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IVerifier",
-                          "referencedDeclaration": 648,
+                          "referencedDeclaration": 701,
                           "type": "contract IVerifier"
                         },
-                        "id": 705,
+                        "id": 758,
                         "name": "UserDefinedTypeName",
-                        "src": "1450:9:2"
+                        "src": "1450:9:3"
                       }
                     ],
-                    "id": 706,
+                    "id": 759,
                     "name": "VariableDeclaration",
-                    "src": "1450:19:2"
+                    "src": "1450:19:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeManager",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "contract IFeeManager",
@@ -5957,23 +5957,23 @@
                         "attributes": {
                           "contractScope": null,
                           "name": "IFeeManager",
-                          "referencedDeclaration": 654,
+                          "referencedDeclaration": 707,
                           "type": "contract IFeeManager"
                         },
-                        "id": 707,
+                        "id": 760,
                         "name": "UserDefinedTypeName",
-                        "src": "1475:11:2"
+                        "src": "1475:11:3"
                       }
                     ],
-                    "id": 708,
+                    "id": 761,
                     "name": "VariableDeclaration",
-                    "src": "1475:23:2"
+                    "src": "1475:23:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_denomination",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -5986,20 +5986,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 709,
+                        "id": 762,
                         "name": "ElementaryTypeName",
-                        "src": "1504:7:2"
+                        "src": "1504:7:3"
                       }
                     ],
-                    "id": 710,
+                    "id": 763,
                     "name": "VariableDeclaration",
-                    "src": "1504:21:2"
+                    "src": "1504:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_merkleTreeHeight",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint32",
@@ -6012,20 +6012,20 @@
                           "name": "uint32",
                           "type": "uint32"
                         },
-                        "id": 711,
+                        "id": 764,
                         "name": "ElementaryTypeName",
-                        "src": "1531:6:2"
+                        "src": "1531:6:3"
                       }
                     ],
-                    "id": 712,
+                    "id": 765,
                     "name": "VariableDeclaration",
-                    "src": "1531:24:2"
+                    "src": "1531:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_operator",
-                      "scope": 744,
+                      "scope": 797,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -6039,19 +6039,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 713,
+                        "id": 766,
                         "name": "ElementaryTypeName",
-                        "src": "1561:7:2"
+                        "src": "1561:7:3"
                       }
                     ],
-                    "id": 714,
+                    "id": 767,
                     "name": "VariableDeclaration",
-                    "src": "1561:17:2"
+                    "src": "1561:17:3"
                   }
                 ],
-                "id": 715,
+                "id": 768,
                 "name": "ParameterList",
-                "src": "1444:138:2"
+                "src": "1444:138:3"
               },
               {
                 "attributes": {
@@ -6060,9 +6060,9 @@
                   ]
                 },
                 "children": [],
-                "id": 719,
+                "id": 772,
                 "name": "ParameterList",
-                "src": "1631:0:2"
+                "src": "1631:0:3"
               },
               {
                 "children": [
@@ -6072,13 +6072,13 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 632,
+                      "referencedDeclaration": 685,
                       "type": "type(contract MerkleTreeWithHistory)",
                       "value": "MerkleTreeWithHistory"
                     },
-                    "id": 716,
+                    "id": 769,
                     "name": "Identifier",
-                    "src": "1583:21:2"
+                    "src": "1583:21:3"
                   },
                   {
                     "attributes": {
@@ -6086,18 +6086,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 712,
+                      "referencedDeclaration": 765,
                       "type": "uint32",
                       "value": "_merkleTreeHeight"
                     },
-                    "id": 717,
+                    "id": 770,
                     "name": "Identifier",
-                    "src": "1605:17:2"
+                    "src": "1605:17:3"
                   }
                 ],
-                "id": 718,
+                "id": 771,
                 "name": "ModifierInvocation",
-                "src": "1583:40:2"
+                "src": "1583:40:3"
               },
               {
                 "children": [
@@ -6131,16 +6131,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 720,
+                            "id": 773,
                             "name": "Identifier",
-                            "src": "1637:7:2"
+                            "src": "1637:7:3"
                           },
                           {
                             "attributes": {
@@ -6163,13 +6163,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 710,
+                                  "referencedDeclaration": 763,
                                   "type": "uint256",
                                   "value": "_denomination"
                                 },
-                                "id": 721,
+                                "id": 774,
                                 "name": "Identifier",
-                                "src": "1645:13:2"
+                                "src": "1645:13:3"
                               },
                               {
                                 "attributes": {
@@ -6184,14 +6184,14 @@
                                   "type": "int_const 0",
                                   "value": "0"
                                 },
-                                "id": 722,
+                                "id": 775,
                                 "name": "Literal",
-                                "src": "1661:1:2"
+                                "src": "1661:1:3"
                               }
                             ],
-                            "id": 723,
+                            "id": 776,
                             "name": "BinaryOperation",
-                            "src": "1645:17:2"
+                            "src": "1645:17:3"
                           },
                           {
                             "attributes": {
@@ -6206,19 +6206,19 @@
                               "type": "literal_string \"denomination should be greater than 0\"",
                               "value": "denomination should be greater than 0"
                             },
-                            "id": 724,
+                            "id": 777,
                             "name": "Literal",
-                            "src": "1664:39:2"
+                            "src": "1664:39:3"
                           }
                         ],
-                        "id": 725,
+                        "id": 778,
                         "name": "FunctionCall",
-                        "src": "1637:67:2"
+                        "src": "1637:67:3"
                       }
                     ],
-                    "id": 726,
+                    "id": 779,
                     "name": "ExpressionStatement",
-                    "src": "1637:67:2"
+                    "src": "1637:67:3"
                   },
                   {
                     "children": [
@@ -6239,13 +6239,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 670,
+                              "referencedDeclaration": 723,
                               "type": "contract IVerifier",
                               "value": "verifier"
                             },
-                            "id": 727,
+                            "id": 780,
                             "name": "Identifier",
-                            "src": "1710:8:2"
+                            "src": "1710:8:3"
                           },
                           {
                             "attributes": {
@@ -6253,23 +6253,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 706,
+                              "referencedDeclaration": 759,
                               "type": "contract IVerifier",
                               "value": "_verifier"
                             },
-                            "id": 728,
+                            "id": 781,
                             "name": "Identifier",
-                            "src": "1721:9:2"
+                            "src": "1721:9:3"
                           }
                         ],
-                        "id": 729,
+                        "id": 782,
                         "name": "Assignment",
-                        "src": "1710:20:2"
+                        "src": "1710:20:3"
                       }
                     ],
-                    "id": 730,
+                    "id": 783,
                     "name": "ExpressionStatement",
-                    "src": "1710:20:2"
+                    "src": "1710:20:3"
                   },
                   {
                     "children": [
@@ -6290,13 +6290,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 672,
+                              "referencedDeclaration": 725,
                               "type": "contract IFeeManager",
                               "value": "feeManager"
                             },
-                            "id": 731,
+                            "id": 784,
                             "name": "Identifier",
-                            "src": "1736:10:2"
+                            "src": "1736:10:3"
                           },
                           {
                             "attributes": {
@@ -6304,23 +6304,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 708,
+                              "referencedDeclaration": 761,
                               "type": "contract IFeeManager",
                               "value": "_feeManager"
                             },
-                            "id": 732,
+                            "id": 785,
                             "name": "Identifier",
-                            "src": "1749:11:2"
+                            "src": "1749:11:3"
                           }
                         ],
-                        "id": 733,
+                        "id": 786,
                         "name": "Assignment",
-                        "src": "1736:24:2"
+                        "src": "1736:24:3"
                       }
                     ],
-                    "id": 734,
+                    "id": 787,
                     "name": "ExpressionStatement",
-                    "src": "1736:24:2"
+                    "src": "1736:24:3"
                   },
                   {
                     "children": [
@@ -6341,13 +6341,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 674,
+                              "referencedDeclaration": 727,
                               "type": "address",
                               "value": "operator"
                             },
-                            "id": 735,
+                            "id": 788,
                             "name": "Identifier",
-                            "src": "1766:8:2"
+                            "src": "1766:8:3"
                           },
                           {
                             "attributes": {
@@ -6355,23 +6355,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 714,
+                              "referencedDeclaration": 767,
                               "type": "address",
                               "value": "_operator"
                             },
-                            "id": 736,
+                            "id": 789,
                             "name": "Identifier",
-                            "src": "1777:9:2"
+                            "src": "1777:9:3"
                           }
                         ],
-                        "id": 737,
+                        "id": 790,
                         "name": "Assignment",
-                        "src": "1766:20:2"
+                        "src": "1766:20:3"
                       }
                     ],
-                    "id": 738,
+                    "id": 791,
                     "name": "ExpressionStatement",
-                    "src": "1766:20:2"
+                    "src": "1766:20:3"
                   },
                   {
                     "children": [
@@ -6392,13 +6392,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 660,
+                              "referencedDeclaration": 713,
                               "type": "uint256",
                               "value": "denomination"
                             },
-                            "id": 739,
+                            "id": 792,
                             "name": "Identifier",
-                            "src": "1792:12:2"
+                            "src": "1792:12:3"
                           },
                           {
                             "attributes": {
@@ -6406,33 +6406,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 710,
+                              "referencedDeclaration": 763,
                               "type": "uint256",
                               "value": "_denomination"
                             },
-                            "id": 740,
+                            "id": 793,
                             "name": "Identifier",
-                            "src": "1807:13:2"
+                            "src": "1807:13:3"
                           }
                         ],
-                        "id": 741,
+                        "id": 794,
                         "name": "Assignment",
-                        "src": "1792:28:2"
+                        "src": "1792:28:3"
                       }
                     ],
-                    "id": 742,
+                    "id": 795,
                     "name": "ExpressionStatement",
-                    "src": "1792:28:2"
+                    "src": "1792:28:3"
                   }
                 ],
-                "id": 743,
+                "id": 796,
                 "name": "Block",
-                "src": "1631:194:2"
+                "src": "1631:194:3"
               }
             ],
-            "id": 744,
+            "id": 797,
             "name": "FunctionDefinition",
-            "src": "1433:392:2"
+            "src": "1433:392:3"
           },
           {
             "attributes": {
@@ -6441,7 +6441,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "deposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -6453,7 +6453,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_commitment",
-                      "scope": 782,
+                      "scope": 835,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -6466,19 +6466,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 745,
+                        "id": 798,
                         "name": "ElementaryTypeName",
-                        "src": "2090:7:2"
+                        "src": "2090:7:3"
                       }
                     ],
-                    "id": 746,
+                    "id": 799,
                     "name": "VariableDeclaration",
-                    "src": "2090:19:2"
+                    "src": "2090:19:3"
                   }
                 ],
-                "id": 747,
+                "id": 800,
                 "name": "ParameterList",
-                "src": "2089:21:2"
+                "src": "2089:21:3"
               },
               {
                 "attributes": {
@@ -6487,9 +6487,9 @@
                   ]
                 },
                 "children": [],
-                "id": 750,
+                "id": 803,
                 "name": "ParameterList",
-                "src": "2141:0:2"
+                "src": "2141:0:3"
               },
               {
                 "attributes": {
@@ -6502,18 +6502,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
-                    "id": 748,
+                    "id": 801,
                     "name": "Identifier",
-                    "src": "2128:12:2"
+                    "src": "2128:12:3"
                   }
                 ],
-                "id": 749,
+                "id": 802,
                 "name": "ModifierInvocation",
-                "src": "2128:12:2"
+                "src": "2128:12:3"
               },
               {
                 "children": [
@@ -6547,16 +6547,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 751,
+                            "id": 804,
                             "name": "Identifier",
-                            "src": "2147:7:2"
+                            "src": "2147:7:3"
                           },
                           {
                             "attributes": {
@@ -6586,13 +6586,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 668,
+                                      "referencedDeclaration": 721,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "commitments"
                                     },
-                                    "id": 752,
+                                    "id": 805,
                                     "name": "Identifier",
-                                    "src": "2156:11:2"
+                                    "src": "2156:11:3"
                                   },
                                   {
                                     "attributes": {
@@ -6600,23 +6600,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 746,
+                                      "referencedDeclaration": 799,
                                       "type": "bytes32",
                                       "value": "_commitment"
                                     },
-                                    "id": 753,
+                                    "id": 806,
                                     "name": "Identifier",
-                                    "src": "2168:11:2"
+                                    "src": "2168:11:3"
                                   }
                                 ],
-                                "id": 754,
+                                "id": 807,
                                 "name": "IndexAccess",
-                                "src": "2156:24:2"
+                                "src": "2156:24:3"
                               }
                             ],
-                            "id": 755,
+                            "id": 808,
                             "name": "UnaryOperation",
-                            "src": "2155:25:2"
+                            "src": "2155:25:3"
                           },
                           {
                             "attributes": {
@@ -6631,24 +6631,24 @@
                               "type": "literal_string \"The commitment has been submitted\"",
                               "value": "The commitment has been submitted"
                             },
-                            "id": 756,
+                            "id": 809,
                             "name": "Literal",
-                            "src": "2182:35:2"
+                            "src": "2182:35:3"
                           }
                         ],
-                        "id": 757,
+                        "id": 810,
                         "name": "FunctionCall",
-                        "src": "2147:71:2"
+                        "src": "2147:71:3"
                       }
                     ],
-                    "id": 758,
+                    "id": 811,
                     "name": "ExpressionStatement",
-                    "src": "2147:71:2"
+                    "src": "2147:71:3"
                   },
                   {
                     "attributes": {
                       "assignments": [
-                        760
+                        813
                       ]
                     },
                     "children": [
@@ -6656,7 +6656,7 @@
                         "attributes": {
                           "constant": false,
                           "name": "insertedIndex",
-                          "scope": 781,
+                          "scope": 834,
                           "stateVariable": false,
                           "storageLocation": "default",
                           "type": "uint32",
@@ -6669,14 +6669,14 @@
                               "name": "uint32",
                               "type": "uint32"
                             },
-                            "id": 759,
+                            "id": 812,
                             "name": "ElementaryTypeName",
-                            "src": "2225:6:2"
+                            "src": "2225:6:3"
                           }
                         ],
-                        "id": 760,
+                        "id": 813,
                         "name": "VariableDeclaration",
-                        "src": "2225:20:2"
+                        "src": "2225:20:3"
                       },
                       {
                         "attributes": {
@@ -6704,13 +6704,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 574,
+                              "referencedDeclaration": 627,
                               "type": "function (bytes32) returns (uint32)",
                               "value": "_insert"
                             },
-                            "id": 761,
+                            "id": 814,
                             "name": "Identifier",
-                            "src": "2248:7:2"
+                            "src": "2248:7:3"
                           },
                           {
                             "attributes": {
@@ -6718,23 +6718,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 762,
+                            "id": 815,
                             "name": "Identifier",
-                            "src": "2256:11:2"
+                            "src": "2256:11:3"
                           }
                         ],
-                        "id": 763,
+                        "id": 816,
                         "name": "FunctionCall",
-                        "src": "2248:20:2"
+                        "src": "2248:20:3"
                       }
                     ],
-                    "id": 764,
+                    "id": 817,
                     "name": "VariableDeclarationStatement",
-                    "src": "2225:43:2"
+                    "src": "2225:43:3"
                   },
                   {
                     "children": [
@@ -6765,13 +6765,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 668,
+                                  "referencedDeclaration": 721,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "commitments"
                                 },
-                                "id": 765,
+                                "id": 818,
                                 "name": "Identifier",
-                                "src": "2274:11:2"
+                                "src": "2274:11:3"
                               },
                               {
                                 "attributes": {
@@ -6779,18 +6779,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 746,
+                                  "referencedDeclaration": 799,
                                   "type": "bytes32",
                                   "value": "_commitment"
                                 },
-                                "id": 766,
+                                "id": 819,
                                 "name": "Identifier",
-                                "src": "2286:11:2"
+                                "src": "2286:11:3"
                               }
                             ],
-                            "id": 767,
+                            "id": 820,
                             "name": "IndexAccess",
-                            "src": "2274:24:2"
+                            "src": "2274:24:3"
                           },
                           {
                             "attributes": {
@@ -6805,19 +6805,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 768,
+                            "id": 821,
                             "name": "Literal",
-                            "src": "2301:4:2"
+                            "src": "2301:4:3"
                           }
                         ],
-                        "id": 769,
+                        "id": 822,
                         "name": "Assignment",
-                        "src": "2274:31:2"
+                        "src": "2274:31:3"
                       }
                     ],
-                    "id": 770,
+                    "id": 823,
                     "name": "ExpressionStatement",
-                    "src": "2274:31:2"
+                    "src": "2274:31:3"
                   },
                   {
                     "children": [
@@ -6847,23 +6847,23 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 785,
+                              "referencedDeclaration": 838,
                               "type": "function ()",
                               "value": "_processDeposit"
                             },
-                            "id": 771,
+                            "id": 824,
                             "name": "Identifier",
-                            "src": "2311:15:2"
+                            "src": "2311:15:3"
                           }
                         ],
-                        "id": 772,
+                        "id": 825,
                         "name": "FunctionCall",
-                        "src": "2311:17:2"
+                        "src": "2311:17:3"
                       }
                     ],
-                    "id": 773,
+                    "id": 826,
                     "name": "ExpressionStatement",
-                    "src": "2311:17:2"
+                    "src": "2311:17:3"
                   },
                   {
                     "children": [
@@ -6901,13 +6901,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 694,
+                              "referencedDeclaration": 747,
                               "type": "function (bytes32,uint32,uint256)",
                               "value": "Deposit"
                             },
-                            "id": 774,
+                            "id": 827,
                             "name": "Identifier",
-                            "src": "2340:7:2"
+                            "src": "2340:7:3"
                           },
                           {
                             "attributes": {
@@ -6915,13 +6915,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 746,
+                              "referencedDeclaration": 799,
                               "type": "bytes32",
                               "value": "_commitment"
                             },
-                            "id": 775,
+                            "id": 828,
                             "name": "Identifier",
-                            "src": "2348:11:2"
+                            "src": "2348:11:3"
                           },
                           {
                             "attributes": {
@@ -6929,13 +6929,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 760,
+                              "referencedDeclaration": 813,
                               "type": "uint32",
                               "value": "insertedIndex"
                             },
-                            "id": 776,
+                            "id": 829,
                             "name": "Identifier",
-                            "src": "2361:13:2"
+                            "src": "2361:13:3"
                           },
                           {
                             "attributes": {
@@ -6955,38 +6955,38 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 1005,
+                                  "referencedDeclaration": 1058,
                                   "type": "block",
                                   "value": "block"
                                 },
-                                "id": 777,
+                                "id": 830,
                                 "name": "Identifier",
-                                "src": "2376:5:2"
+                                "src": "2376:5:3"
                               }
                             ],
-                            "id": 778,
+                            "id": 831,
                             "name": "MemberAccess",
-                            "src": "2376:15:2"
+                            "src": "2376:15:3"
                           }
                         ],
-                        "id": 779,
+                        "id": 832,
                         "name": "FunctionCall",
-                        "src": "2340:52:2"
+                        "src": "2340:52:3"
                       }
                     ],
-                    "id": 780,
+                    "id": 833,
                     "name": "EmitStatement",
-                    "src": "2335:57:2"
+                    "src": "2335:57:3"
                   }
                 ],
-                "id": 781,
+                "id": 834,
                 "name": "Block",
-                "src": "2141:256:2"
+                "src": "2141:256:3"
               }
             ],
-            "id": 782,
+            "id": 835,
             "name": "FunctionDefinition",
-            "src": "2073:324:2"
+            "src": "2073:324:3"
           },
           {
             "attributes": {
@@ -6999,7 +6999,7 @@
                 null
               ],
               "name": "_processDeposit",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -7012,9 +7012,9 @@
                   ]
                 },
                 "children": [],
-                "id": 783,
+                "id": 836,
                 "name": "ParameterList",
-                "src": "2484:2:2"
+                "src": "2484:2:3"
               },
               {
                 "attributes": {
@@ -7023,14 +7023,14 @@
                   ]
                 },
                 "children": [],
-                "id": 784,
+                "id": 837,
                 "name": "ParameterList",
-                "src": "2495:0:2"
+                "src": "2495:0:3"
               }
             ],
-            "id": 785,
+            "id": 838,
             "name": "FunctionDefinition",
-            "src": "2460:36:2"
+            "src": "2460:36:3"
           },
           {
             "attributes": {
@@ -7039,7 +7039,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "withdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "payable",
               "superFunction": null,
               "visibility": "external"
@@ -7051,7 +7051,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_proof",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes",
@@ -7064,20 +7064,20 @@
                           "name": "bytes",
                           "type": "bytes"
                         },
-                        "id": 786,
+                        "id": 839,
                         "name": "ElementaryTypeName",
-                        "src": "2911:5:2"
+                        "src": "2911:5:3"
                       }
                     ],
-                    "id": 787,
+                    "id": 840,
                     "name": "VariableDeclaration",
-                    "src": "2911:21:2"
+                    "src": "2911:21:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_root",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -7090,20 +7090,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 788,
+                        "id": 841,
                         "name": "ElementaryTypeName",
-                        "src": "2934:7:2"
+                        "src": "2934:7:3"
                       }
                     ],
-                    "id": 789,
+                    "id": 842,
                     "name": "VariableDeclaration",
-                    "src": "2934:13:2"
+                    "src": "2934:13:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -7116,20 +7116,20 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 790,
+                        "id": 843,
                         "name": "ElementaryTypeName",
-                        "src": "2949:7:2"
+                        "src": "2949:7:3"
                       }
                     ],
-                    "id": 791,
+                    "id": 844,
                     "name": "VariableDeclaration",
-                    "src": "2949:22:2"
+                    "src": "2949:22:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7143,20 +7143,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 792,
+                        "id": 845,
                         "name": "ElementaryTypeName",
-                        "src": "2973:15:2"
+                        "src": "2973:15:3"
                       }
                     ],
-                    "id": 793,
+                    "id": 846,
                     "name": "VariableDeclaration",
-                    "src": "2973:26:2"
+                    "src": "2973:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -7170,20 +7170,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 794,
+                        "id": 847,
                         "name": "ElementaryTypeName",
-                        "src": "3001:15:2"
+                        "src": "3001:15:3"
                       }
                     ],
-                    "id": 795,
+                    "id": 848,
                     "name": "VariableDeclaration",
-                    "src": "3001:24:2"
+                    "src": "3001:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_fee",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -7196,20 +7196,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 796,
+                        "id": 849,
                         "name": "ElementaryTypeName",
-                        "src": "3027:7:2"
+                        "src": "3027:7:3"
                       }
                     ],
-                    "id": 797,
+                    "id": 850,
                     "name": "VariableDeclaration",
-                    "src": "3027:12:2"
+                    "src": "3027:12:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 873,
+                      "scope": 926,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -7222,19 +7222,19 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 798,
+                        "id": 851,
                         "name": "ElementaryTypeName",
-                        "src": "3041:7:2"
+                        "src": "3041:7:3"
                       }
                     ],
-                    "id": 799,
+                    "id": 852,
                     "name": "VariableDeclaration",
-                    "src": "3041:15:2"
+                    "src": "3041:15:3"
                   }
                 ],
-                "id": 800,
+                "id": 853,
                 "name": "ParameterList",
-                "src": "2910:147:2"
+                "src": "2910:147:3"
               },
               {
                 "attributes": {
@@ -7243,9 +7243,9 @@
                   ]
                 },
                 "children": [],
-                "id": 803,
+                "id": 856,
                 "name": "ParameterList",
-                "src": "3088:0:2"
+                "src": "3088:0:3"
               },
               {
                 "attributes": {
@@ -7258,18 +7258,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 999,
+                      "referencedDeclaration": 1052,
                       "type": "modifier ()",
                       "value": "nonReentrant"
                     },
-                    "id": 801,
+                    "id": 854,
                     "name": "Identifier",
-                    "src": "3075:12:2"
+                    "src": "3075:12:3"
                   }
                 ],
-                "id": 802,
+                "id": 855,
                 "name": "ModifierInvocation",
-                "src": "3075:12:2"
+                "src": "3075:12:3"
               },
               {
                 "children": [
@@ -7303,16 +7303,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 804,
+                            "id": 857,
                             "name": "Identifier",
-                            "src": "3094:7:2"
+                            "src": "3094:7:3"
                           },
                           {
                             "attributes": {
@@ -7335,13 +7335,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 797,
+                                  "referencedDeclaration": 850,
                                   "type": "uint256",
                                   "value": "_fee"
                                 },
-                                "id": 805,
+                                "id": 858,
                                 "name": "Identifier",
-                                "src": "3102:4:2"
+                                "src": "3102:4:3"
                               },
                               {
                                 "attributes": {
@@ -7349,18 +7349,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 660,
+                                  "referencedDeclaration": 713,
                                   "type": "uint256",
                                   "value": "denomination"
                                 },
-                                "id": 806,
+                                "id": 859,
                                 "name": "Identifier",
-                                "src": "3110:12:2"
+                                "src": "3110:12:3"
                               }
                             ],
-                            "id": 807,
+                            "id": 860,
                             "name": "BinaryOperation",
-                            "src": "3102:20:2"
+                            "src": "3102:20:3"
                           },
                           {
                             "attributes": {
@@ -7375,19 +7375,19 @@
                               "type": "literal_string \"Fee exceeds transfer value\"",
                               "value": "Fee exceeds transfer value"
                             },
-                            "id": 808,
+                            "id": 861,
                             "name": "Literal",
-                            "src": "3124:28:2"
+                            "src": "3124:28:3"
                           }
                         ],
-                        "id": 809,
+                        "id": 862,
                         "name": "FunctionCall",
-                        "src": "3094:59:2"
+                        "src": "3094:59:3"
                       }
                     ],
-                    "id": 810,
+                    "id": 863,
                     "name": "ExpressionStatement",
-                    "src": "3094:59:2"
+                    "src": "3094:59:3"
                   },
                   {
                     "children": [
@@ -7419,16 +7419,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 811,
+                            "id": 864,
                             "name": "Identifier",
-                            "src": "3159:7:2"
+                            "src": "3159:7:3"
                           },
                           {
                             "attributes": {
@@ -7458,13 +7458,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 664,
+                                      "referencedDeclaration": 717,
                                       "type": "mapping(bytes32 => bool)",
                                       "value": "nullifierHashes"
                                     },
-                                    "id": 812,
+                                    "id": 865,
                                     "name": "Identifier",
-                                    "src": "3168:15:2"
+                                    "src": "3168:15:3"
                                   },
                                   {
                                     "attributes": {
@@ -7472,23 +7472,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 791,
+                                      "referencedDeclaration": 844,
                                       "type": "bytes32",
                                       "value": "_nullifierHash"
                                     },
-                                    "id": 813,
+                                    "id": 866,
                                     "name": "Identifier",
-                                    "src": "3184:14:2"
+                                    "src": "3184:14:3"
                                   }
                                 ],
-                                "id": 814,
+                                "id": 867,
                                 "name": "IndexAccess",
-                                "src": "3168:31:2"
+                                "src": "3168:31:3"
                               }
                             ],
-                            "id": 815,
+                            "id": 868,
                             "name": "UnaryOperation",
-                            "src": "3167:32:2"
+                            "src": "3167:32:3"
                           },
                           {
                             "attributes": {
@@ -7503,19 +7503,19 @@
                               "type": "literal_string \"The note has been already spent\"",
                               "value": "The note has been already spent"
                             },
-                            "id": 816,
+                            "id": 869,
                             "name": "Literal",
-                            "src": "3201:33:2"
+                            "src": "3201:33:3"
                           }
                         ],
-                        "id": 817,
+                        "id": 870,
                         "name": "FunctionCall",
-                        "src": "3159:76:2"
+                        "src": "3159:76:3"
                       }
                     ],
-                    "id": 818,
+                    "id": 871,
                     "name": "ExpressionStatement",
-                    "src": "3159:76:2"
+                    "src": "3159:76:3"
                   },
                   {
                     "children": [
@@ -7547,16 +7547,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 819,
+                            "id": 872,
                             "name": "Identifier",
-                            "src": "3241:7:2"
+                            "src": "3241:7:3"
                           },
                           {
                             "attributes": {
@@ -7584,13 +7584,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 621,
+                                  "referencedDeclaration": 674,
                                   "type": "function (bytes32) view returns (bool)",
                                   "value": "isKnownRoot"
                                 },
-                                "id": 820,
+                                "id": 873,
                                 "name": "Identifier",
-                                "src": "3249:11:2"
+                                "src": "3249:11:3"
                               },
                               {
                                 "attributes": {
@@ -7598,18 +7598,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 789,
+                                  "referencedDeclaration": 842,
                                   "type": "bytes32",
                                   "value": "_root"
                                 },
-                                "id": 821,
+                                "id": 874,
                                 "name": "Identifier",
-                                "src": "3261:5:2"
+                                "src": "3261:5:3"
                               }
                             ],
-                            "id": 822,
+                            "id": 875,
                             "name": "FunctionCall",
-                            "src": "3249:18:2"
+                            "src": "3249:18:3"
                           },
                           {
                             "attributes": {
@@ -7624,19 +7624,19 @@
                               "type": "literal_string \"Cannot find your merkle root\"",
                               "value": "Cannot find your merkle root"
                             },
-                            "id": 823,
+                            "id": 876,
                             "name": "Literal",
-                            "src": "3269:30:2"
+                            "src": "3269:30:3"
                           }
                         ],
-                        "id": 824,
+                        "id": 877,
                         "name": "FunctionCall",
-                        "src": "3241:59:2"
+                        "src": "3241:59:3"
                       }
                     ],
-                    "id": 825,
+                    "id": 878,
                     "name": "ExpressionStatement",
-                    "src": "3241:59:2"
+                    "src": "3241:59:3"
                   },
                   {
                     "children": [
@@ -7668,16 +7668,16 @@
                                 }
                               ],
                               "overloadedDeclarations": [
-                                1018,
-                                1019
+                                1071,
+                                1072
                               ],
-                              "referencedDeclaration": 1019,
+                              "referencedDeclaration": 1072,
                               "type": "function (bool,string memory) pure",
                               "value": "require"
                             },
-                            "id": 826,
+                            "id": 879,
                             "name": "Identifier",
-                            "src": "3339:7:2"
+                            "src": "3339:7:3"
                           },
                           {
                             "attributes": {
@@ -7711,7 +7711,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "verifyProof",
-                                  "referencedDeclaration": 647,
+                                  "referencedDeclaration": 700,
                                   "type": "function (bytes memory,uint256[6] memory) external returns (bool)"
                                 },
                                 "children": [
@@ -7721,18 +7721,18 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 670,
+                                      "referencedDeclaration": 723,
                                       "type": "contract IVerifier",
                                       "value": "verifier"
                                     },
-                                    "id": 827,
+                                    "id": 880,
                                     "name": "Identifier",
-                                    "src": "3347:8:2"
+                                    "src": "3347:8:3"
                                   }
                                 ],
-                                "id": 828,
+                                "id": 881,
                                 "name": "MemberAccess",
-                                "src": "3347:20:2"
+                                "src": "3347:20:3"
                               },
                               {
                                 "attributes": {
@@ -7740,13 +7740,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 787,
+                                  "referencedDeclaration": 840,
                                   "type": "bytes calldata",
                                   "value": "_proof"
                                 },
-                                "id": 829,
+                                "id": 882,
                                 "name": "Identifier",
-                                "src": "3368:6:2"
+                                "src": "3368:6:3"
                               },
                               {
                                 "attributes": {
@@ -7789,9 +7789,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 830,
+                                        "id": 883,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3377:7:2"
+                                        "src": "3377:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7799,18 +7799,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 789,
+                                          "referencedDeclaration": 842,
                                           "type": "bytes32",
                                           "value": "_root"
                                         },
-                                        "id": 831,
+                                        "id": 884,
                                         "name": "Identifier",
-                                        "src": "3385:5:2"
+                                        "src": "3385:5:3"
                                       }
                                     ],
-                                    "id": 832,
+                                    "id": 885,
                                     "name": "FunctionCall",
-                                    "src": "3377:14:2"
+                                    "src": "3377:14:3"
                                   },
                                   {
                                     "attributes": {
@@ -7842,9 +7842,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 833,
+                                        "id": 886,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3393:7:2"
+                                        "src": "3393:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7852,18 +7852,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 791,
+                                          "referencedDeclaration": 844,
                                           "type": "bytes32",
                                           "value": "_nullifierHash"
                                         },
-                                        "id": 834,
+                                        "id": 887,
                                         "name": "Identifier",
-                                        "src": "3401:14:2"
+                                        "src": "3401:14:3"
                                       }
                                     ],
-                                    "id": 835,
+                                    "id": 888,
                                     "name": "FunctionCall",
-                                    "src": "3393:23:2"
+                                    "src": "3393:23:3"
                                   },
                                   {
                                     "attributes": {
@@ -7895,9 +7895,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 836,
+                                        "id": 889,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3418:7:2"
+                                        "src": "3418:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7905,18 +7905,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 793,
+                                          "referencedDeclaration": 846,
                                           "type": "address payable",
                                           "value": "_recipient"
                                         },
-                                        "id": 837,
+                                        "id": 890,
                                         "name": "Identifier",
-                                        "src": "3426:10:2"
+                                        "src": "3426:10:3"
                                       }
                                     ],
-                                    "id": 838,
+                                    "id": 891,
                                     "name": "FunctionCall",
-                                    "src": "3418:19:2"
+                                    "src": "3418:19:3"
                                   },
                                   {
                                     "attributes": {
@@ -7948,9 +7948,9 @@
                                           "type": "type(uint256)",
                                           "value": "uint256"
                                         },
-                                        "id": 839,
+                                        "id": 892,
                                         "name": "ElementaryTypeNameExpression",
-                                        "src": "3439:7:2"
+                                        "src": "3439:7:3"
                                       },
                                       {
                                         "attributes": {
@@ -7958,18 +7958,18 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 795,
+                                          "referencedDeclaration": 848,
                                           "type": "address payable",
                                           "value": "_relayer"
                                         },
-                                        "id": 840,
+                                        "id": 893,
                                         "name": "Identifier",
-                                        "src": "3447:8:2"
+                                        "src": "3447:8:3"
                                       }
                                     ],
-                                    "id": 841,
+                                    "id": 894,
                                     "name": "FunctionCall",
-                                    "src": "3439:17:2"
+                                    "src": "3439:17:3"
                                   },
                                   {
                                     "attributes": {
@@ -7977,13 +7977,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 797,
+                                      "referencedDeclaration": 850,
                                       "type": "uint256",
                                       "value": "_fee"
                                     },
-                                    "id": 842,
+                                    "id": 895,
                                     "name": "Identifier",
-                                    "src": "3458:4:2"
+                                    "src": "3458:4:3"
                                   },
                                   {
                                     "attributes": {
@@ -7991,23 +7991,23 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 799,
+                                      "referencedDeclaration": 852,
                                       "type": "uint256",
                                       "value": "_refund"
                                     },
-                                    "id": 843,
+                                    "id": 896,
                                     "name": "Identifier",
-                                    "src": "3464:7:2"
+                                    "src": "3464:7:3"
                                   }
                                 ],
-                                "id": 844,
+                                "id": 897,
                                 "name": "TupleExpression",
-                                "src": "3376:96:2"
+                                "src": "3376:96:3"
                               }
                             ],
-                            "id": 845,
+                            "id": 898,
                             "name": "FunctionCall",
-                            "src": "3347:126:2"
+                            "src": "3347:126:3"
                           },
                           {
                             "attributes": {
@@ -8022,19 +8022,19 @@
                               "type": "literal_string \"Invalid withdraw proof\"",
                               "value": "Invalid withdraw proof"
                             },
-                            "id": 846,
+                            "id": 899,
                             "name": "Literal",
-                            "src": "3475:24:2"
+                            "src": "3475:24:3"
                           }
                         ],
-                        "id": 847,
+                        "id": 900,
                         "name": "FunctionCall",
-                        "src": "3339:161:2"
+                        "src": "3339:161:3"
                       }
                     ],
-                    "id": 848,
+                    "id": 901,
                     "name": "ExpressionStatement",
-                    "src": "3339:161:2"
+                    "src": "3339:161:3"
                   },
                   {
                     "children": [
@@ -8065,13 +8065,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 664,
+                                  "referencedDeclaration": 717,
                                   "type": "mapping(bytes32 => bool)",
                                   "value": "nullifierHashes"
                                 },
-                                "id": 849,
+                                "id": 902,
                                 "name": "Identifier",
-                                "src": "3507:15:2"
+                                "src": "3507:15:3"
                               },
                               {
                                 "attributes": {
@@ -8079,18 +8079,18 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 791,
+                                  "referencedDeclaration": 844,
                                   "type": "bytes32",
                                   "value": "_nullifierHash"
                                 },
-                                "id": 850,
+                                "id": 903,
                                 "name": "Identifier",
-                                "src": "3523:14:2"
+                                "src": "3523:14:3"
                               }
                             ],
-                            "id": 851,
+                            "id": 904,
                             "name": "IndexAccess",
-                            "src": "3507:31:2"
+                            "src": "3507:31:3"
                           },
                           {
                             "attributes": {
@@ -8105,19 +8105,19 @@
                               "type": "bool",
                               "value": "true"
                             },
-                            "id": 852,
+                            "id": 905,
                             "name": "Literal",
-                            "src": "3541:4:2"
+                            "src": "3541:4:3"
                           }
                         ],
-                        "id": 853,
+                        "id": 906,
                         "name": "Assignment",
-                        "src": "3507:38:2"
+                        "src": "3507:38:3"
                       }
                     ],
-                    "id": 854,
+                    "id": 907,
                     "name": "ExpressionStatement",
-                    "src": "3507:38:2"
+                    "src": "3507:38:3"
                   },
                   {
                     "children": [
@@ -8163,13 +8163,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 886,
+                              "referencedDeclaration": 939,
                               "type": "function (address payable,address payable,uint256,uint256,address)",
                               "value": "_processWithdraw"
                             },
-                            "id": 855,
+                            "id": 908,
                             "name": "Identifier",
-                            "src": "3551:16:2"
+                            "src": "3551:16:3"
                           },
                           {
                             "attributes": {
@@ -8177,13 +8177,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 856,
+                            "id": 909,
                             "name": "Identifier",
-                            "src": "3568:10:2"
+                            "src": "3568:10:3"
                           },
                           {
                             "attributes": {
@@ -8191,13 +8191,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 857,
+                            "id": 910,
                             "name": "Identifier",
-                            "src": "3580:8:2"
+                            "src": "3580:8:3"
                           },
                           {
                             "attributes": {
@@ -8205,13 +8205,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 858,
+                            "id": 911,
                             "name": "Identifier",
-                            "src": "3590:4:2"
+                            "src": "3590:4:3"
                           },
                           {
                             "attributes": {
@@ -8219,13 +8219,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 799,
+                              "referencedDeclaration": 852,
                               "type": "uint256",
                               "value": "_refund"
                             },
-                            "id": 859,
+                            "id": 912,
                             "name": "Identifier",
-                            "src": "3596:7:2"
+                            "src": "3596:7:3"
                           },
                           {
                             "attributes": {
@@ -8255,7 +8255,7 @@
                                   "isPure": false,
                                   "lValueRequested": false,
                                   "member_name": "feeTo",
-                                  "referencedDeclaration": 653,
+                                  "referencedDeclaration": 706,
                                   "type": "function () view external returns (address)"
                                 },
                                 "children": [
@@ -8265,33 +8265,33 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 672,
+                                      "referencedDeclaration": 725,
                                       "type": "contract IFeeManager",
                                       "value": "feeManager"
                                     },
-                                    "id": 860,
+                                    "id": 913,
                                     "name": "Identifier",
-                                    "src": "3605:10:2"
+                                    "src": "3605:10:3"
                                   }
                                 ],
-                                "id": 861,
+                                "id": 914,
                                 "name": "MemberAccess",
-                                "src": "3605:16:2"
+                                "src": "3605:16:3"
                               }
                             ],
-                            "id": 862,
+                            "id": 915,
                             "name": "FunctionCall",
-                            "src": "3605:18:2"
+                            "src": "3605:18:3"
                           }
                         ],
-                        "id": 863,
+                        "id": 916,
                         "name": "FunctionCall",
-                        "src": "3551:73:2"
+                        "src": "3551:73:3"
                       }
                     ],
-                    "id": 864,
+                    "id": 917,
                     "name": "ExpressionStatement",
-                    "src": "3551:73:2"
+                    "src": "3551:73:3"
                   },
                   {
                     "children": [
@@ -8333,13 +8333,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 704,
+                              "referencedDeclaration": 757,
                               "type": "function (address,bytes32,address,uint256)",
                               "value": "Withdrawal"
                             },
-                            "id": 865,
+                            "id": 918,
                             "name": "Identifier",
-                            "src": "3635:10:2"
+                            "src": "3635:10:3"
                           },
                           {
                             "attributes": {
@@ -8347,13 +8347,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 793,
+                              "referencedDeclaration": 846,
                               "type": "address payable",
                               "value": "_recipient"
                             },
-                            "id": 866,
+                            "id": 919,
                             "name": "Identifier",
-                            "src": "3646:10:2"
+                            "src": "3646:10:3"
                           },
                           {
                             "attributes": {
@@ -8361,13 +8361,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 791,
+                              "referencedDeclaration": 844,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 867,
+                            "id": 920,
                             "name": "Identifier",
-                            "src": "3658:14:2"
+                            "src": "3658:14:3"
                           },
                           {
                             "attributes": {
@@ -8375,13 +8375,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 795,
+                              "referencedDeclaration": 848,
                               "type": "address payable",
                               "value": "_relayer"
                             },
-                            "id": 868,
+                            "id": 921,
                             "name": "Identifier",
-                            "src": "3674:8:2"
+                            "src": "3674:8:3"
                           },
                           {
                             "attributes": {
@@ -8389,33 +8389,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 797,
+                              "referencedDeclaration": 850,
                               "type": "uint256",
                               "value": "_fee"
                             },
-                            "id": 869,
+                            "id": 922,
                             "name": "Identifier",
-                            "src": "3684:4:2"
+                            "src": "3684:4:3"
                           }
                         ],
-                        "id": 870,
+                        "id": 923,
                         "name": "FunctionCall",
-                        "src": "3635:54:2"
+                        "src": "3635:54:3"
                       }
                     ],
-                    "id": 871,
+                    "id": 924,
                     "name": "EmitStatement",
-                    "src": "3630:59:2"
+                    "src": "3630:59:3"
                   }
                 ],
-                "id": 872,
+                "id": 925,
                 "name": "Block",
-                "src": "3088:606:2"
+                "src": "3088:606:3"
               }
             ],
-            "id": 873,
+            "id": 926,
             "name": "FunctionDefinition",
-            "src": "2893:801:2"
+            "src": "2893:801:3"
           },
           {
             "attributes": {
@@ -8428,7 +8428,7 @@
                 null
               ],
               "name": "_processWithdraw",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "internal"
@@ -8440,7 +8440,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_recipient",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -8454,20 +8454,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 874,
+                        "id": 927,
                         "name": "ElementaryTypeName",
-                        "src": "3783:15:2"
+                        "src": "3783:15:3"
                       }
                     ],
-                    "id": 875,
+                    "id": 928,
                     "name": "VariableDeclaration",
-                    "src": "3783:26:2"
+                    "src": "3783:26:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address payable",
@@ -8481,20 +8481,20 @@
                           "stateMutability": "payable",
                           "type": "address payable"
                         },
-                        "id": 876,
+                        "id": 929,
                         "name": "ElementaryTypeName",
-                        "src": "3811:15:2"
+                        "src": "3811:15:3"
                       }
                     ],
-                    "id": 877,
+                    "id": 930,
                     "name": "VariableDeclaration",
-                    "src": "3811:24:2"
+                    "src": "3811:24:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_relayer_fee",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -8507,20 +8507,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 878,
+                        "id": 931,
                         "name": "ElementaryTypeName",
-                        "src": "3837:7:2"
+                        "src": "3837:7:3"
                       }
                     ],
-                    "id": 879,
+                    "id": 932,
                     "name": "VariableDeclaration",
-                    "src": "3837:20:2"
+                    "src": "3837:20:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_refund",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "uint256",
@@ -8533,20 +8533,20 @@
                           "name": "uint256",
                           "type": "uint256"
                         },
-                        "id": 880,
+                        "id": 933,
                         "name": "ElementaryTypeName",
-                        "src": "3859:7:2"
+                        "src": "3859:7:3"
                       }
                     ],
-                    "id": 881,
+                    "id": 934,
                     "name": "VariableDeclaration",
-                    "src": "3859:15:2"
+                    "src": "3859:15:3"
                   },
                   {
                     "attributes": {
                       "constant": false,
                       "name": "_feeTo",
-                      "scope": 886,
+                      "scope": 939,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -8560,19 +8560,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 882,
+                        "id": 935,
                         "name": "ElementaryTypeName",
-                        "src": "3876:7:2"
+                        "src": "3876:7:3"
                       }
                     ],
-                    "id": 883,
+                    "id": 936,
                     "name": "VariableDeclaration",
-                    "src": "3876:14:2"
+                    "src": "3876:14:3"
                   }
                 ],
-                "id": 884,
+                "id": 937,
                 "name": "ParameterList",
-                "src": "3782:109:2"
+                "src": "3782:109:3"
               },
               {
                 "attributes": {
@@ -8581,14 +8581,14 @@
                   ]
                 },
                 "children": [],
-                "id": 885,
+                "id": 938,
                 "name": "ParameterList",
-                "src": "3900:0:2"
+                "src": "3900:0:3"
               }
             ],
-            "id": 886,
+            "id": 939,
             "name": "FunctionDefinition",
-            "src": "3757:144:2"
+            "src": "3757:144:3"
           },
           {
             "attributes": {
@@ -8600,7 +8600,7 @@
                 null
               ],
               "name": "isSpent",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "public"
@@ -8612,7 +8612,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHash",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bytes32",
@@ -8625,19 +8625,19 @@
                           "name": "bytes32",
                           "type": "bytes32"
                         },
-                        "id": 887,
+                        "id": 940,
                         "name": "ElementaryTypeName",
-                        "src": "3968:7:2"
+                        "src": "3968:7:3"
                       }
                     ],
-                    "id": 888,
+                    "id": 941,
                     "name": "VariableDeclaration",
-                    "src": "3968:22:2"
+                    "src": "3968:22:3"
                   }
                 ],
-                "id": 889,
+                "id": 942,
                 "name": "ParameterList",
-                "src": "3967:24:2"
+                "src": "3967:24:3"
               },
               {
                 "children": [
@@ -8645,7 +8645,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "",
-                      "scope": 898,
+                      "scope": 951,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "bool",
@@ -8658,25 +8658,25 @@
                           "name": "bool",
                           "type": "bool"
                         },
-                        "id": 890,
+                        "id": 943,
                         "name": "ElementaryTypeName",
-                        "src": "4012:4:2"
+                        "src": "4012:4:3"
                       }
                     ],
-                    "id": 891,
+                    "id": 944,
                     "name": "VariableDeclaration",
-                    "src": "4012:4:2"
+                    "src": "4012:4:3"
                   }
                 ],
-                "id": 892,
+                "id": 945,
                 "name": "ParameterList",
-                "src": "4011:6:2"
+                "src": "4011:6:3"
               },
               {
                 "children": [
                   {
                     "attributes": {
-                      "functionReturnParameters": 892
+                      "functionReturnParameters": 945
                     },
                     "children": [
                       {
@@ -8695,13 +8695,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 664,
+                              "referencedDeclaration": 717,
                               "type": "mapping(bytes32 => bool)",
                               "value": "nullifierHashes"
                             },
-                            "id": 893,
+                            "id": 946,
                             "name": "Identifier",
-                            "src": "4031:15:2"
+                            "src": "4031:15:3"
                           },
                           {
                             "attributes": {
@@ -8709,33 +8709,33 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 888,
+                              "referencedDeclaration": 941,
                               "type": "bytes32",
                               "value": "_nullifierHash"
                             },
-                            "id": 894,
+                            "id": 947,
                             "name": "Identifier",
-                            "src": "4047:14:2"
+                            "src": "4047:14:3"
                           }
                         ],
-                        "id": 895,
+                        "id": 948,
                         "name": "IndexAccess",
-                        "src": "4031:31:2"
+                        "src": "4031:31:3"
                       }
                     ],
-                    "id": 896,
+                    "id": 949,
                     "name": "Return",
-                    "src": "4024:38:2"
+                    "src": "4024:38:3"
                   }
                 ],
-                "id": 897,
+                "id": 950,
                 "name": "Block",
-                "src": "4018:49:2"
+                "src": "4018:49:3"
               }
             ],
-            "id": 898,
+            "id": 951,
             "name": "FunctionDefinition",
-            "src": "3951:116:2"
+            "src": "3951:116:3"
           },
           {
             "attributes": {
@@ -8747,7 +8747,7 @@
                 null
               ],
               "name": "isSpentArray",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "view",
               "superFunction": null,
               "visibility": "external"
@@ -8759,7 +8759,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_nullifierHashes",
-                      "scope": 943,
+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "calldata",
                       "type": "bytes32[]",
@@ -8778,24 +8778,24 @@
                               "name": "bytes32",
                               "type": "bytes32"
                             },
-                            "id": 899,
+                            "id": 952,
                             "name": "ElementaryTypeName",
-                            "src": "4150:7:2"
+                            "src": "4150:7:3"
                           }
                         ],
-                        "id": 900,
+                        "id": 953,
                         "name": "ArrayTypeName",
-                        "src": "4150:9:2"
+                        "src": "4150:9:3"
                       }
                     ],
-                    "id": 901,
+                    "id": 954,
                     "name": "VariableDeclaration",
-                    "src": "4150:35:2"
+                    "src": "4150:35:3"
                   }
                 ],
-                "id": 902,
+                "id": 955,
                 "name": "ParameterList",
-                "src": "4149:37:2"
+                "src": "4149:37:3"
               },
               {
                 "children": [
@@ -8803,7 +8803,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "spent",
-                      "scope": 943,
+                      "scope": 996,
                       "stateVariable": false,
                       "storageLocation": "memory",
                       "type": "bool[]",
@@ -8822,24 +8822,24 @@
                               "name": "bool",
                               "type": "bool"
                             },
-                            "id": 903,
+                            "id": 956,
                             "name": "ElementaryTypeName",
-                            "src": "4209:4:2"
+                            "src": "4209:4:3"
                           }
                         ],
-                        "id": 904,
+                        "id": 957,
                         "name": "ArrayTypeName",
-                        "src": "4209:6:2"
+                        "src": "4209:6:3"
                       }
                     ],
-                    "id": 905,
+                    "id": 958,
                     "name": "VariableDeclaration",
-                    "src": "4209:19:2"
+                    "src": "4209:19:3"
                   }
                 ],
-                "id": 906,
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                 "name": "ParameterList",
-                "src": "4208:21:2"
+                "src": "4208:21:3"
               },
               {
                 "children": [
@@ -8862,13 +8862,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 905,
+                              "referencedDeclaration": 958,
                               "type": "bool[] memory",
                               "value": "spent"
                             },
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+                            "id": 960,
                             "name": "Identifier",
-                            "src": "4236:5:2"
+                            "src": "4236:5:3"
                           },
                           {
                             "attributes": {
@@ -8911,19 +8911,19 @@
                                           "name": "bool",
                                           "type": "bool"
                                         },
-                                        "id": 908,
+                                        "id": 961,
                                         "name": "ElementaryTypeName",
-                                        "src": "4248:4:2"
+                                        "src": "4248:4:3"
                                       }
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-                                    "id": 909,
+                                    "id": 962,
                                     "name": "ArrayTypeName",
-                                    "src": "4248:6:2"
+                                    "src": "4248:6:3"
                                   }
                                 ],
-                                "id": 910,
+                                "id": 963,
                                 "name": "NewExpression",
-                                "src": "4244:10:2"
+                                "src": "4244:10:3"
                               },
                               {
                                 "attributes": {
@@ -8943,40 +8943,40 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 901,
+                                      "referencedDeclaration": 954,
                                       "type": "bytes32[] calldata",
                                       "value": "_nullifierHashes"
                                     },
-                                    "id": 911,
+                                    "id": 964,
                                     "name": "Identifier",
-                                    "src": "4255:16:2"
+                                    "src": "4255:16:3"
                                   }
                                 ],
-                                "id": 912,
+                                "id": 965,
                                 "name": "MemberAccess",
-                                "src": "4255:23:2"
+                                "src": "4255:23:3"
                               }
                             ],
-                            "id": 913,
+                            "id": 966,
                             "name": "FunctionCall",
-                            "src": "4244:35:2"
+                            "src": "4244:35:3"
                           }
                         ],
-                        "id": 914,
+                        "id": 967,
                         "name": "Assignment",
-                        "src": "4236:43:2"
+                        "src": "4236:43:3"
                       }
                     ],
-                    "id": 915,
+                    "id": 968,
                     "name": "ExpressionStatement",
-                    "src": "4236:43:2"
+                    "src": "4236:43:3"
                   },
                   {
                     "children": [
                       {
                         "attributes": {
                           "assignments": [
-                            917
+                            970
                           ]
                         },
                         "children": [
@@ -8984,7 +8984,7 @@
                             "attributes": {
                               "constant": false,
                               "name": "i",
-                              "scope": 941,
+                              "scope": 994,
                               "stateVariable": false,
                               "storageLocation": "default",
                               "type": "uint256",
@@ -8997,14 +8997,14 @@
                                   "name": "uint",
                                   "type": "uint256"
                                 },
-                                "id": 916,
+                                "id": 969,
                                 "name": "ElementaryTypeName",
-                                "src": "4289:4:2"
+                                "src": "4289:4:3"
                               }
                             ],
-                            "id": 917,
+                            "id": 970,
                             "name": "VariableDeclaration",
-                            "src": "4289:6:2"
+                            "src": "4289:6:3"
                           },
                           {
                             "attributes": {
@@ -9019,14 +9019,14 @@
                               "type": "int_const 0",
                               "value": "0"
                             },
-                            "id": 918,
+                            "id": 971,
                             "name": "Literal",
-                            "src": "4298:1:2"
+                            "src": "4298:1:3"
                           }
                         ],
-                        "id": 919,
+                        "id": 972,
                         "name": "VariableDeclarationStatement",
-                        "src": "4289:10:2"
+                        "src": "4289:10:3"
                       },
                       {
                         "attributes": {
@@ -9049,13 +9049,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 917,
+                              "referencedDeclaration": 970,
                               "type": "uint256",
                               "value": "i"
                             },
-                            "id": 920,
+                            "id": 973,
                             "name": "Identifier",
-                            "src": "4301:1:2"
+                            "src": "4301:1:3"
                           },
                           {
                             "attributes": {
@@ -9075,23 +9075,23 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 901,
+                                  "referencedDeclaration": 954,
                                   "type": "bytes32[] calldata",
                                   "value": "_nullifierHashes"
                                 },
-                                "id": 921,
+                                "id": 974,
                                 "name": "Identifier",
-                                "src": "4305:16:2"
+                                "src": "4305:16:3"
                               }
                             ],
-                            "id": 922,
+                            "id": 975,
                             "name": "MemberAccess",
-                            "src": "4305:23:2"
+                            "src": "4305:23:3"
                           }
                         ],
-                        "id": 923,
+                        "id": 976,
                         "name": "BinaryOperation",
-                        "src": "4301:27:2"
+                        "src": "4301:27:3"
                       },
                       {
                         "children": [
@@ -9113,23 +9113,23 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 917,
+                                  "referencedDeclaration": 970,
                                   "type": "uint256",
                                   "value": "i"
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-                                "id": 924,
+                                "id": 977,
                                 "name": "Identifier",
-                                "src": "4330:1:2"
+                                "src": "4330:1:3"
                               }
                             ],
-                            "id": 925,
+                            "id": 978,
                             "name": "UnaryOperation",
-                            "src": "4330:3:2"
+                            "src": "4330:3:3"
                           }
                         ],
-                        "id": 926,
+                        "id": 979,
                         "name": "ExpressionStatement",
-                        "src": "4330:3:2"
+                        "src": "4330:3:3"
                       },
                       {
                         "children": [
@@ -9164,13 +9164,13 @@
                                       "overloadedDeclarations": [
                                         null
                                       ],
-                                      "referencedDeclaration": 898,
+                                      "referencedDeclaration": 951,
                                       "type": "function (bytes32) view returns (bool)",
                                       "value": "isSpent"
                                     },
-                                    "id": 927,
+                                    "id": 980,
                                     "name": "Identifier",
-                                    "src": "4347:7:2"
+                                    "src": "4347:7:3"
                                   },
                                   {
                                     "attributes": {
@@ -9188,13 +9188,13 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 901,
+                                          "referencedDeclaration": 954,
                                           "type": "bytes32[] calldata",
                                           "value": "_nullifierHashes"
                                         },
-                                        "id": 928,
+                                        "id": 981,
                                         "name": "Identifier",
-                                        "src": "4355:16:2"
+                                        "src": "4355:16:3"
                                       },
                                       {
                                         "attributes": {
@@ -9202,23 +9202,23 @@
                                           "overloadedDeclarations": [
                                             null
                                           ],
-                                          "referencedDeclaration": 917,
+                                          "referencedDeclaration": 970,
                                           "type": "uint256",
                                           "value": "i"
                                         },
-                                        "id": 929,
+                                        "id": 982,
                                         "name": "Identifier",
-                                        "src": "4372:1:2"
+                                        "src": "4372:1:3"
                                       }
                                     ],
-                                    "id": 930,
+                                    "id": 983,
                                     "name": "IndexAccess",
-                                    "src": "4355:19:2"
+                                    "src": "4355:19:3"
                                   }
                                 ],
-                                "id": 931,
+                                "id": 984,
                                 "name": "FunctionCall",
-                                "src": "4347:28:2"
+                                "src": "4347:28:3"
                               },
                               {
                                 "children": [
@@ -9251,13 +9251,13 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 905,
+                                                  "referencedDeclaration": 958,
                                                   "type": "bool[] memory",
                                                   "value": "spent"
                                                 },
-                                                "id": 932,
+                                                "id": 985,
                                                 "name": "Identifier",
-                                                "src": "4387:5:2"
+                                                "src": "4387:5:3"
                                               },
                                               {
                                                 "attributes": {
@@ -9265,18 +9265,18 @@
                                                   "overloadedDeclarations": [
                                                     null
                                                   ],
-                                                  "referencedDeclaration": 917,
+                                                  "referencedDeclaration": 970,
                                                   "type": "uint256",
                                                   "value": "i"
                                                 },
-                                                "id": 933,
+                                                "id": 986,
                                                 "name": "Identifier",
-                                                "src": "4393:1:2"
+                                                "src": "4393:1:3"
                                               }
                                             ],
-                                            "id": 934,
+                                            "id": 987,
                                             "name": "IndexAccess",
-                                            "src": "4387:8:2"
+                                            "src": "4387:8:3"
                                           },
                                           {
                                             "attributes": {
@@ -9291,49 +9291,49 @@
                                               "type": "bool",
                                               "value": "true"
                                             },
-                                            "id": 935,
+                                            "id": 988,
                                             "name": "Literal",
-                                            "src": "4398:4:2"
+                                            "src": "4398:4:3"
                                           }
                                         ],
-                                        "id": 936,
+                                        "id": 989,
                                         "name": "Assignment",
-                                        "src": "4387:15:2"
+                                        "src": "4387:15:3"
                                       }
                                     ],
-                                    "id": 937,
+                                    "id": 990,
                                     "name": "ExpressionStatement",
-                                    "src": "4387:15:2"
+                                    "src": "4387:15:3"
                                   }
                                 ],
-                                "id": 938,
+                                "id": 991,
                                 "name": "Block",
-                                "src": "4377:34:2"
+                                "src": "4377:34:3"
                               }
                             ],
-                            "id": 939,
+                            "id": 992,
                             "name": "IfStatement",
-                            "src": "4343:68:2"
+                            "src": "4343:68:3"
                           }
                         ],
-                        "id": 940,
+                        "id": 993,
                         "name": "Block",
-                        "src": "4335:82:2"
+                        "src": "4335:82:3"
                       }
                     ],
-                    "id": 941,
+                    "id": 994,
                     "name": "ForStatement",
-                    "src": "4285:132:2"
+                    "src": "4285:132:3"
                   }
                 ],
-                "id": 942,
+                "id": 995,
                 "name": "Block",
-                "src": "4230:191:2"
+                "src": "4230:191:3"
               }
             ],
-            "id": 943,
+            "id": 996,
             "name": "FunctionDefinition",
-            "src": "4128:293:2"
+            "src": "4128:293:3"
           },
           {
             "attributes": {
@@ -9342,7 +9342,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "updateVerifier",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "external"
@@ -9354,7 +9354,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_newVerifier",
-                      "scope": 957,
+                      "scope": 1010,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -9368,19 +9368,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 944,
+                        "id": 997,
                         "name": "ElementaryTypeName",
-                        "src": "4675:7:2"
+                        "src": "4675:7:3"
                       }
                     ],
-                    "id": 945,
+                    "id": 998,
                     "name": "VariableDeclaration",
-                    "src": "4675:20:2"
+                    "src": "4675:20:3"
                   }
                 ],
-                "id": 946,
+                "id": 999,
                 "name": "ParameterList",
-                "src": "4674:22:2"
+                "src": "4674:22:3"
               },
               {
                 "attributes": {
@@ -9389,9 +9389,9 @@
                   ]
                 },
                 "children": [],
-                "id": 949,
+                "id": 1002,
                 "name": "ParameterList",
-                "src": "4719:0:2"
+                "src": "4719:0:3"
               },
               {
                 "attributes": {
@@ -9404,18 +9404,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 686,
+                      "referencedDeclaration": 739,
                       "type": "modifier ()",
                       "value": "onlyOperator"
                     },
-                    "id": 947,
+                    "id": 1000,
                     "name": "Identifier",
-                    "src": "4706:12:2"
+                    "src": "4706:12:3"
                   }
                 ],
-                "id": 948,
+                "id": 1001,
                 "name": "ModifierInvocation",
-                "src": "4706:12:2"
+                "src": "4706:12:3"
               },
               {
                 "children": [
@@ -9438,13 +9438,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 670,
+                              "referencedDeclaration": 723,
                               "type": "contract IVerifier",
                               "value": "verifier"
                             },
-                            "id": 950,
+                            "id": 1003,
                             "name": "Identifier",
-                            "src": "4725:8:2"
+                            "src": "4725:8:3"
                           },
                           {
                             "attributes": {
@@ -9472,13 +9472,13 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 648,
+                                  "referencedDeclaration": 701,
                                   "type": "type(contract IVerifier)",
                                   "value": "IVerifier"
                                 },
-                                "id": 951,
+                                "id": 1004,
                                 "name": "Identifier",
-                                "src": "4736:9:2"
+                                "src": "4736:9:3"
                               },
                               {
                                 "attributes": {
@@ -9486,38 +9486,38 @@
                                   "overloadedDeclarations": [
                                     null
                                   ],
-                                  "referencedDeclaration": 945,
+                                  "referencedDeclaration": 998,
                                   "type": "address",
                                   "value": "_newVerifier"
                                 },
-                                "id": 952,
+                                "id": 1005,
                                 "name": "Identifier",
-                                "src": "4746:12:2"
+                                "src": "4746:12:3"
                               }
                             ],
-                            "id": 953,
+                            "id": 1006,
                             "name": "FunctionCall",
-                            "src": "4736:23:2"
+                            "src": "4736:23:3"
                           }
                         ],
-                        "id": 954,
+                        "id": 1007,
                         "name": "Assignment",
-                        "src": "4725:34:2"
+                        "src": "4725:34:3"
                       }
                     ],
-                    "id": 955,
+                    "id": 1008,
                     "name": "ExpressionStatement",
-                    "src": "4725:34:2"
+                    "src": "4725:34:3"
                   }
                 ],
-                "id": 956,
+                "id": 1009,
                 "name": "Block",
-                "src": "4719:45:2"
+                "src": "4719:45:3"
               }
             ],
-            "id": 957,
+            "id": 1010,
             "name": "FunctionDefinition",
-            "src": "4651:113:2"
+            "src": "4651:113:3"
           },
           {
             "attributes": {
@@ -9526,7 +9526,7 @@
               "isConstructor": false,
               "kind": "function",
               "name": "changeOperator",
-              "scope": 970,
+              "scope": 1023,
               "stateMutability": "nonpayable",
               "superFunction": null,
               "visibility": "external"
@@ -9538,7 +9538,7 @@
                     "attributes": {
                       "constant": false,
                       "name": "_newOperator",
-                      "scope": 969,
+                      "scope": 1022,
                       "stateVariable": false,
                       "storageLocation": "default",
                       "type": "address",
@@ -9552,19 +9552,19 @@
                           "stateMutability": "nonpayable",
                           "type": "address"
                         },
-                        "id": 958,
+                        "id": 1011,
                         "name": "ElementaryTypeName",
-                        "src": "4838:7:2"
+                        "src": "4838:7:3"
                       }
                     ],
-                    "id": 959,
+                    "id": 1012,
                     "name": "VariableDeclaration",
-                    "src": "4838:20:2"
+                    "src": "4838:20:3"
                   }
                 ],
-                "id": 960,
+                "id": 1013,
                 "name": "ParameterList",
-                "src": "4837:22:2"
+                "src": "4837:22:3"
               },
               {
                 "attributes": {
@@ -9573,9 +9573,9 @@
                   ]
                 },
                 "children": [],
-                "id": 963,
+                "id": 1016,
                 "name": "ParameterList",
-                "src": "4882:0:2"
+                "src": "4882:0:3"
               },
               {
                 "attributes": {
@@ -9588,18 +9588,18 @@
                       "overloadedDeclarations": [
                         null
                       ],
-                      "referencedDeclaration": 686,
+                      "referencedDeclaration": 739,
                       "type": "modifier ()",
                       "value": "onlyOperator"
                     },
-                    "id": 961,
+                    "id": 1014,
                     "name": "Identifier",
-                    "src": "4869:12:2"
+                    "src": "4869:12:3"
                   }
                 ],
-                "id": 962,
+                "id": 1015,
                 "name": "ModifierInvocation",
-                "src": "4869:12:2"
+                "src": "4869:12:3"
               },
               {
                 "children": [
@@ -9622,13 +9622,13 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 674,
+                              "referencedDeclaration": 727,
                               "type": "address",
                               "value": "operator"
                             },
-                            "id": 964,
+                            "id": 1017,
                             "name": "Identifier",
-                            "src": "4888:8:2"
+                            "src": "4888:8:3"
                           },
                           {
                             "attributes": {
@@ -9636,43 +9636,43 @@
                               "overloadedDeclarations": [
                                 null
                               ],
-                              "referencedDeclaration": 959,
+                              "referencedDeclaration": 1012,
                               "type": "address",
                               "value": "_newOperator"
                             },
-                            "id": 965,
+                            "id": 1018,
                             "name": "Identifier",
-                            "src": "4899:12:2"
+                            "src": "4899:12:3"
                           }
                         ],
-                        "id": 966,
+                        "id": 1019,
                         "name": "Assignment",
-                        "src": "4888:23:2"
+                        "src": "4888:23:3"
                       }
                     ],
-                    "id": 967,
+                    "id": 1020,
                     "name": "ExpressionStatement",
-                    "src": "4888:23:2"
+                    "src": "4888:23:3"
                   }
                 ],
-                "id": 968,
+                "id": 1021,
                 "name": "Block",
-                "src": "4882:34:2"
+                "src": "4882:34:3"
               }
             ],
-            "id": 969,
+            "id": 1022,
             "name": "FunctionDefinition",
-            "src": "4814:102:2"
+            "src": "4814:102:3"
           }
         ],
-        "id": 970,
+        "id": 1023,
         "name": "ContractDefinition",
-        "src": "318:4600:2"
+        "src": "318:4600:3"
       }
     ],
-    "id": 971,
+    "id": 1024,
     "name": "SourceUnit",
-    "src": "0:4919:2"
+    "src": "0:4919:3"
   },
   "compiler": {
     "name": "solc",
@@ -9680,7 +9680,7 @@
   },
   "networks": {},
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T22:21:29.545Z",
+  "updatedAt": "2021-04-02T22:52:06.050Z",
   "devdoc": {
     "methods": {
       "changeOperator(address)": {
diff --git a/client/contracts/Verifier.json b/client/contracts/Verifier.json
index b66ad18..332e2ba 100644
--- a/client/contracts/Verifier.json
+++ b/client/contracts/Verifier.json
@@ -29913,8 +29913,8 @@
     "42220": {
       "events": {},
       "links": {},
-      "address": "0x955D048f90935495F4f720b198AC31C9F0c57669",
-      "transactionHash": "0x4c179445168a4339ecf7692039fc0d00704aeb523389c00cfafb386ab70c35a0"
+      "address": "0x28ab493BFb23dB3709f4bDE25E3eE53154fA1afD",
+      "transactionHash": "0x0a6a0c9cbe5745e51ab064ad8f4921b9f99a8335ee3a2d40ea55b80a78313f33"
     },
     "44787": {
       "events": {},
@@ -29924,7 +29924,8 @@
     }
   },
   "schemaVersion": "3.3.4",
-  "updatedAt": "2021-04-02T20:48:07.541Z",
+  "updatedAt": "2021-04-02T22:56:11.641Z",
+  "networkType": "ethereum",
   "devdoc": {
     "methods": {}
   },