{ "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 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 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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 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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. 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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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