Merge pull request #40 from tornadocash/networks

CLI update
2024-10-01 01:06:17 -04:00 · 2020-03-04 14:13:40 +03:00 · 2020-03-04 14:13:40 +03:00 · d1c4a9bee6
commit d1c4a9bee6
parent 7033f34434 0e0ac72b0f
6 changed files with 553 additions and 299 deletions
--- a/README.md
+++ b/README.md
@ -53,20 +53,48 @@ Use browser version on Kovan:
 1. `npx http-server` - serve current dir, you can use any other static http server
 1. Open `localhost:8080`

-Use with command line version with Ganache:
-### ETHTornado
-1. `npm run migrate:dev`
-1. `./cli.js deposit`
-1. `./cli.js withdraw <note from previous step> <destination eth address>`
-1. `./cli.js balance <destination eth address>`
+Use with command line version. Works for Ganache, Kovan and Mainnet:
+### Initialization
+1. `cp .env.example .env`
+1. `npm run download`
+1. `npm run build:contract`

-### ERC20Tornado
+### Ganache
+1. make sure you complete steps from Initialization
+1. `ganache-cli -i 1337`
 1. `npm run migrate:dev`
-1. `./cli.js depositErc20`
-1. `./cli.js withdrawErc20 <note from previous step> <destination eth address> <relayer eth address>`
-1. `./cli.js balanceErc20 <destination eth address> <relayer eth address>`
+1. `./cli.js test`
+1. `./cli.js --help`
+
+### Kovan, Mainnet
+1. make sure you complete steps from Initialization
+1. Add `PRIVATE_KEY` to `.env` file
+1. `./cli.js --help`
+
+Example:
+```bash
+./cli.js deposit ETH 0.1 --rpc https://kovan.infura.io/v3/27a9649f826b4e31a83e07ae09a87448
+```
+> Your note: tornado-eth-0.1-42-0xf73dd6833ccbcc046c44228c8e2aa312bf49e08389dadc7c65e6a73239867b7ef49c705c4db227e2fadd8489a494b6880bdcb6016047e019d1abec1c7652
+> Tornado ETH balance is 8.9
+> Sender account ETH balance is 1004873.470619891361352542
+> Submitting deposit transaction
+> Tornado ETH balance is 9
+> Sender account ETH balance is 1004873.361652048361352542
+
+```bash
+./cli.js withdraw tornado-eth-0.1-42-0xf73dd6833ccbcc046c44228c8e2aa312bf49e08389dadc7c65e6a73239867b7ef49c705c4db227e2fadd8489a494b6880bdcb6016047e019d1abec1c7652 0x8589427373D6D84E98730D7795D8f6f8731FDA16 --rpc https://kovan.infura.io/v3/27a9649f826b4e31a83e07ae09a87448 --relayer https://kovan-frelay.duckdns.org
+```
+
+> Relay address:  0x6A31736e7490AbE5D5676be059DFf064AB4aC754
+> Getting current state from tornado contract
+> Generating SNARK proof
+> Proof time: 9117.051ms
+> Sending withdraw transaction through relay
+> Transaction submitted through the relay. View transaction on etherscan https://kovan.etherscan.io/tx/0xcb21ae8cad723818c6bc7273e83e00c8393fcdbe74802ce5d562acad691a2a7b
+> Transaction mined in block 17036120
+> Done

-If you want, you can point the app to existing tornado contracts on Mainnet or Kovan. It should work without any problems

 ## Deploy ETH Tornado Cash
 1. `cp .env.example .env`
--- a/cli.js
+++ b/cli.js
@ -1,6 +1,8 @@
-#!/usr/bin/env node
+#!/usr/bin/env NODE_OPTIONS=--no-warnings node
 // Temporary demo client
 // Works both in browser and node.js
+
+require('dotenv').config()
 const fs = require('fs')
 const axios = require('axios')
 const assert = require('assert')
@ -12,13 +14,17 @@ const merkleTree = require('./lib/MerkleTree')
 const Web3 = require('web3')
 const buildGroth16 = require('websnark/src/groth16')
 const websnarkUtils = require('websnark/src/utils')
-const { toWei, fromWei } = require('web3-utils')
+const { toWei, fromWei, toBN, BN } = require('web3-utils')
+const config = require('./config')
+const program = require('commander')

-let web3, tornado, erc20tornado, circuit, proving_key, groth16, erc20, senderAccount
-let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, ERC20_TOKEN
+let web3, tornado, circuit, proving_key, groth16, erc20, senderAccount, netId
+let MERKLE_TREE_HEIGHT, ETH_AMOUNT, TOKEN_AMOUNT, PRIVATE_KEY

 /** Whether we are in a browser or node.js */
 const inBrowser = (typeof window !== 'undefined')
+let isLocalRPC = false
+const networks = { '1': 'mainnet', '42': 'kovan' }

 /** Generate random number of specified byte length */
 const rbigint = nbytes => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
@ -28,21 +34,27 @@ const pedersenHash = data => circomlib.babyJub.unpackPoint(circomlib.pedersenHas

 /** BigNumber to hex string of specified length */
 function toHex(number, length = 32) {
-  let str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16)
+  const str = number instanceof Buffer ? number.toString('hex') : bigInt(number).toString(16)
  return '0x' + str.padStart(length * 2, '0')
 }

-/** Display account balance */
-async function printBalance(account, name) {
-  console.log(`${name} ETH balance is`, web3.utils.fromWei(await web3.eth.getBalance(account)))
-  console.log(`${name} Token Balance is`, web3.utils.fromWei(await erc20.methods.balanceOf(account).call()))
+/** Display ETH account balance */
+async function printETHBalance({ address, name }) {
+  console.log(`${name} ETH balance is`, web3.utils.fromWei(await web3.eth.getBalance(address)))
+}
+
+/** Display ERC20 account balance */
+async function printERC20Balance({ address, name, tokenAddress }) {
+  const erc20ContractJson = require('./build/contracts/ERC20Mock.json')
+  erc20 = tokenAddress ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : erc20
+  console.log(`${name} Token Balance is`, web3.utils.fromWei(await erc20.methods.balanceOf(address).call()))
 }

 /**
 * Create deposit object from secret and nullifier
 */
-function createDeposit(nullifier, secret) {
-  let deposit = { nullifier, secret }
+function createDeposit({ nullifier, secret }) {
+  const deposit = { nullifier, secret }
  deposit.preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
  deposit.commitment = pedersenHash(deposit.preimage)
  deposit.nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31))
@ -50,88 +62,90 @@ function createDeposit(nullifier, secret) {
 }

 /**
- * Make an ETH deposit
+ * Make a deposit
+ * @param currency Сurrency
+ * @param amount Deposit amount
 */
-async function deposit() {
-  const deposit = createDeposit(rbigint(31), rbigint(31))
-
-  console.log('Submitting deposit transaction')
-  await tornado.methods.deposit(toHex(deposit.commitment)).send({ value: ETH_AMOUNT, from: senderAccount, gas:2e6 })
-
+async function deposit({ currency, amount }) {
+  const deposit = createDeposit({ nullifier: rbigint(31), secret: rbigint(31) })
  const note = toHex(deposit.preimage, 62)
-  console.log('Your note:', note)
-  return note
-}
+  const noteString = `tornado-${currency}-${amount}-${netId}-${note}`
+  console.log(`Your note: ${noteString}`)
+  if (currency === 'eth') {
+    await printETHBalance({ address: tornado._address, name: 'Tornado' })
+    await printETHBalance({ address: senderAccount, name: 'Sender account' })
+    const value = isLocalRPC ? ETH_AMOUNT : fromDecimals({ amount, decimals: 18 })
+    console.log('Submitting deposit transaction')
+    await tornado.methods.deposit(toHex(deposit.commitment)).send({ value, from: senderAccount, gas:2e6 })
+    await printETHBalance({ address: tornado._address, name: 'Tornado' })
+    await printETHBalance({ address: senderAccount, name: 'Sender account' })
+  } else { // a token
+    await printERC20Balance({ address: tornado._address, name: 'Tornado' })
+    await printERC20Balance({ address: senderAccount, name: 'Sender account' })
+    const decimals = isLocalRPC ? 18 : config.deployments[`netId${netId}`][currency].decimals
+    const tokenAmount = isLocalRPC ? TOKEN_AMOUNT : fromDecimals({ amount, decimals })
+    if(isLocalRPC) {
+      console.log('Minting some test tokens to deposit')
+      await erc20.methods.mint(senderAccount, tokenAmount).send({ from: senderAccount, gas: 2e6 })
+    }

-/**
- * Make an ERC20 deposit
- */
-async function depositErc20() {
-  const deposit = createDeposit(rbigint(31), rbigint(31))
+    const allowance = await erc20.methods.allowance(senderAccount, tornado._address).call({ from: senderAccount })
+    console.log('Current allowance is', fromWei(allowance))
+    if (toBN(allowance).lt(toBN(tokenAmount))) {
+      console.log('Approving tokens for deposit')
+      await erc20.methods.approve(tornado._address, tokenAmount).send({ from: senderAccount, gas:1e6 })
+    }

-  if(ERC20_TOKEN === '') {
-    console.log('Minting some test tokens to deposit')
-    await erc20.methods.mint(senderAccount, TOKEN_AMOUNT).send({ from: senderAccount, gas: 2e6 })
+    console.log('Submitting deposit transaction')
+    await tornado.methods.deposit(toHex(deposit.commitment)).send({ from: senderAccount, gas:2e6 })
+    await printERC20Balance({ address: tornado._address, name: 'Tornado' })
+    await printERC20Balance({ address: senderAccount, name: 'Sender account' })
  }

-  console.log('Approving tokens for deposit')
-  await erc20.methods.approve(erc20tornado._address, TOKEN_AMOUNT).send({ from: senderAccount, gas:1e6 })
-
-  console.log('Submitting deposit transaction')
-  await erc20tornado.methods.deposit(toHex(deposit.commitment)).send({ from: senderAccount, gas:2e6 })
-
-  const note = toHex(deposit.preimage, 62)
-  console.log('Your note:', note)
-  return note
+  return noteString
 }

 /**
 * Generate merkle tree for a deposit.
- * Download deposit events from the contract, reconstructs merkle tree, finds our deposit leaf
+ * Download deposit events from the tornado, reconstructs merkle tree, finds our deposit leaf
 * in it and generates merkle proof
- * @param contract Tornado contract address
 * @param deposit Deposit object
 */
-async function generateMerkleProof(contract, deposit) {
+async function generateMerkleProof(deposit) {
  // Get all deposit events from smart contract and assemble merkle tree from them
  console.log('Getting current state from tornado contract')
-  const events = await contract.getPastEvents('Deposit', { fromBlock: contract.deployedBlock, toBlock: 'latest' })
+  const events = await tornado.getPastEvents('Deposit', { fromBlock: 0, toBlock: 'latest' })
  const leaves = events
    .sort((a, b) => a.returnValues.leafIndex - b.returnValues.leafIndex) // Sort events in chronological order
    .map(e => e.returnValues.commitment)
  const tree = new merkleTree(MERKLE_TREE_HEIGHT, leaves)

  // Find current commitment in the tree
-  let depositEvent = events.find(e => e.returnValues.commitment === toHex(deposit.commitment))
-  let leafIndex = depositEvent ? depositEvent.returnValues.leafIndex : -1
+  const depositEvent = events.find(e => e.returnValues.commitment === toHex(deposit.commitment))
+  const leafIndex = depositEvent ? depositEvent.returnValues.leafIndex : -1

  // Validate that our data is correct
-  const isValidRoot = await contract.methods.isKnownRoot(toHex(await tree.root())).call()
-  const isSpent = await contract.methods.isSpent(toHex(deposit.nullifierHash)).call()
+  const isValidRoot = await tornado.methods.isKnownRoot(toHex(await tree.root())).call()
+  const isSpent = await tornado.methods.isSpent(toHex(deposit.nullifierHash)).call()
  assert(isValidRoot === true, 'Merkle tree is corrupted')
  assert(isSpent === false, 'The note is already spent')
  assert(leafIndex >= 0, 'The deposit is not found in the tree')

  // Compute merkle proof of our commitment
-  return await tree.path(leafIndex)
+  return tree.path(leafIndex)
 }

 /**
 * Generate SNARK proof for withdrawal
- * @param contract Tornado contract address
- * @param note Note string
+ * @param deposit Deposit object
 * @param recipient Funds recipient
 * @param relayer Relayer address
 * @param fee Relayer fee
 * @param refund Receive ether for exchanged tokens
 */
-async function generateProof(contract, note, recipient, relayer = 0, fee = 0, refund = 0) {
-  // Decode hex string and restore the deposit object
-  let buf = Buffer.from(note.slice(2), 'hex')
-  let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62)))
-
+async function generateProof({ deposit, recipient, relayerAddress = 0, fee = 0, refund = 0 }) {
  // Compute merkle proof of our commitment
-  const { root, path_elements, path_index } = await generateMerkleProof(contract, deposit)
+  const { root, path_elements, path_index } = await generateMerkleProof(deposit)

  // Prepare circuit input
  const input = {
@ -139,7 +153,7 @@ async function generateProof(contract, note, recipient, relayer = 0, fee = 0, re
    root: root,
    nullifierHash: deposit.nullifierHash,
    recipient: bigInt(recipient),
-    relayer: bigInt(relayer),
+    relayer: bigInt(relayerAddress),
    fee: bigInt(fee),
    refund: bigInt(refund),

@ -170,77 +184,135 @@ async function generateProof(contract, note, recipient, relayer = 0, fee = 0, re

 /**
 * Do an ETH withdrawal
- * @param note Note to withdraw
+ * @param noteString Note to withdraw
 * @param recipient Recipient address
 */
-async function withdraw(note, recipient) {
-  const { proof, args } = await generateProof(tornado, note, recipient)
+async function withdraw({ deposit, currency, amount, recipient, relayerURL, refund = '0' }) {
+  if (currency === 'eth' && refund !== '0') {
+    throw new Error('The ETH purchase is supposted to be 0 for ETH withdrawals')
+  }
+  refund = toWei(refund)
+  if (relayerURL) {
+    const relayerStatus = await axios.get(relayerURL + '/status')
+    const { relayerAddress, netId, gasPrices, ethPrices, relayerServiceFee } = relayerStatus.data
+    assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
+    console.log('Relay address: ', relayerAddress)

-  console.log('Submitting withdraw transaction')
-  await tornado.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
+    const decimals = isLocalRPC ? 18 : config.deployments[`netId${netId}`][currency].decimals
+    const fee = calculateFee({ gasPrices, currency, amount, refund, ethPrices, relayerServiceFee, decimals })
+    if (fee.gt(fromDecimals({ amount, decimals }))) {
+      throw new Error('Too high refund')
+    }
+    const { proof, args } = await generateProof({ deposit, recipient, relayerAddress, fee, refund })
+
+    console.log('Sending withdraw transaction through relay')
+    try{
+      const relay = await axios.post(relayerURL + '/relay', { contract: tornado._address, proof, args })
+      if (netId === 1 || netId === 42) {
+        console.log(`Transaction submitted through the relay. View transaction on etherscan https://${networks[netId]}.etherscan.io/tx/${relay.data.txHash}`)
+      } else {
+        console.log(`Transaction submitted through the relay. The transaction hash is ${relay.data.txHash}`)
+      }
+
+      const receipt = await waitForTxReceipt({ txHash: relay.data.txHash })
+      console.log('Transaction mined in block', receipt.blockNumber)
+    } catch(e) {
+      if (e.response) {
+        console.error(e.response.data.error)
+      } else {
+        console.error(e.message)
+      }
+    }
+  } else { // using private key
+    const { proof, args } = await generateProof({ deposit, recipient, refund })
+
+    console.log('Submitting withdraw transaction')
+    await tornado.methods.withdraw(proof, ...args).send({ from: senderAccount, value: refund.toString(), gas: 1e6 })
+      .on('transactionHash', function(txHash){
+        if (netId === 1 || netId === 42) {
+          console.log(`View transaction on etherscan https://${networks[netId]}.etherscan.io/tx/${txHash}`)
+        } else {
+          console.log(`The transaction hash is ${txHash}`)
+        }
+      }).on('error', function(e){
+        console.error('on transactionHash error', e.message)
+      })
+  }
  console.log('Done')
 }

-/**
- * Do a ERC20 withdrawal
- * @param note Note to withdraw
- * @param recipient Recipient address
- */
-async function withdrawErc20(note, recipient) {
-  const { proof, args } = await generateProof(erc20tornado, note, recipient)
+function fromDecimals({ amount, decimals }) {
+  amount = amount.toString()
+  let ether = amount.toString()
+  const base = new BN('10').pow(new BN(decimals))
+  const baseLength = base.toString(10).length - 1 || 1

-  console.log('Submitting withdraw transaction')
-  await erc20tornado.methods.withdraw(proof, ...args).send({ from: senderAccount, gas: 1e6 })
-  console.log('Done')
+  const negative = ether.substring(0, 1) === '-'
+  if (negative) {
+    ether = ether.substring(1)
+  }
+
+  if (ether === '.') {
+    throw new Error('[ethjs-unit] while converting number ' + amount + ' to wei, invalid value')
+  }
+
+  // Split it into a whole and fractional part
+  const comps = ether.split('.')
+  if (comps.length > 2) {
+    throw new Error(
+      '[ethjs-unit] while converting number ' + amount + ' to wei,  too many decimal points'
+    )
+  }
+
+  let whole = comps[0]
+  let fraction = comps[1]
+
+  if (!whole) {
+    whole = '0'
+  }
+  if (!fraction) {
+    fraction = '0'
+  }
+  if (fraction.length > baseLength) {
+    throw new Error(
+      '[ethjs-unit] while converting number ' + amount + ' to wei, too many decimal places'
+    )
+  }
+
+  while (fraction.length < baseLength) {
+    fraction += '0'
+  }
+
+  whole = new BN(whole)
+  fraction = new BN(fraction)
+  let wei = whole.mul(base).add(fraction)
+
+  if (negative) {
+    wei = wei.mul(negative)
+  }
+
+  return new BN(wei.toString(10), 10)
 }

-/**
- * Do an ETH withdrawal through relay
- * @param note Note to withdraw
- * @param recipient Recipient address
- * @param relayUrl Relay url address
- */
-async function withdrawRelay(note, recipient, relayUrl) {
-  const resp = await axios.get(relayUrl + '/status')
-  const { relayerAddress, netId, gasPrices } = resp.data
-  assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
-  console.log('Relay address: ', relayerAddress)
-
-  const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6))
-  const { proof, args } = await generateProof(tornado, note, recipient, relayerAddress, fee)
-
-  console.log('Sending withdraw transaction through relay')
-  const resp2 = await axios.post(relayUrl + '/relay', { contract: tornado._address, proof: { proof, publicSignals: args } })
-  console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
-
-  let receipt = await waitForTxReceipt(resp2.data.txHash)
-  console.log('Transaction mined in block', receipt.blockNumber)
-  console.log('Done')
-}
-
-/**
- * Do a ERC20 withdrawal through relay
- * @param note Note to withdraw
- * @param recipient Recipient address
- * @param relayUrl Relay url address
- */
-async function withdrawRelayErc20(note, recipient, relayUrl) {
-  const resp = await axios.get(relayUrl + '/status')
-  const { relayerAddress, netId, gasPrices, ethPriceInDai } = resp.data
-  assert(netId === await web3.eth.net.getId() || netId === '*', 'This relay is for different network')
-  console.log('Relay address: ', relayerAddress)
-
-  const refund = bigInt(toWei('0.001'))
-  const fee = bigInt(toWei(gasPrices.fast.toString(), 'gwei')).mul(bigInt(1e6)).add(refund).mul(bigInt(fromWei(ethPriceInDai.toString())))
-  const { proof, args } = await generateProof(erc20tornado, note, recipient, relayerAddress, fee, refund)
-
-  console.log('Sending withdraw transaction through relay')
-  const resp2 = await axios.post(relayUrl + '/relay', { contract: erc20tornado._address, proof: { proof, publicSignals: args } })
-  console.log(`Transaction submitted through relay, tx hash: ${resp2.data.txHash}`)
-
-  let receipt = await waitForTxReceipt(resp2.data.txHash)
-  console.log('Transaction mined in block', receipt.blockNumber)
-  console.log('Done')
+function calculateFee({ gasPrices, currency, amount, refund, ethPrices, relayerServiceFee, decimals }) {
+  const feePercent = toBN(fromDecimals({ amount, decimals })).mul(toBN(relayerServiceFee * 10)).div(toBN('1000'))
+  const expense = toBN(toWei(gasPrices.fast.toString(), 'gwei')).mul(toBN(5e5))
+  let desiredFee
+  switch (currency) {
+  case 'eth': {
+    desiredFee = expense.add(feePercent)
+    break
+  }
+  default: {
+    desiredFee =
+        expense.add(toBN(refund))
+          .mul(toBN(10 ** decimals))
+          .div(toBN(ethPrices[currency]))
+    desiredFee = desiredFee.add(feePercent)
+    break
+  }
+  }
+  return desiredFee
 }

 /**
@ -249,7 +321,7 @@ async function withdrawRelayErc20(note, recipient, relayUrl) {
 * @param attempts
 * @param delay
 */
-function waitForTxReceipt(txHash, attempts = 60, delay = 1000) {
+function waitForTxReceipt({ txHash, attempts = 60, delay = 1000 }) {
  return new Promise((resolve, reject) => {
    const checkForTx = async (txHash, retryAttempt = 0) => {
      const result = await web3.eth.getTransactionReceipt(txHash)
@ -267,11 +339,32 @@ function waitForTxReceipt(txHash, attempts = 60, delay = 1000) {
  })
 }

+/**
+ * Parses Tornado.cash note
+ * @param noteString the note
+ */
+function parseNote(noteString) {
+  const noteRegex = /tornado-(?<currency>\w+)-(?<amount>[\d.]+)-(?<netId>\d+)-0x(?<note>[0-9a-fA-F]{124})/g
+  const match = noteRegex.exec(noteString)
+  if (!match) {
+    throw new Error('The note has invalid format')
+  }
+
+  const buf = Buffer.from(match.groups.note, 'hex')
+  const nullifier = bigInt.leBuff2int(buf.slice(0, 31))
+  const secret = bigInt.leBuff2int(buf.slice(31, 62))
+  const deposit = createDeposit({ nullifier, secret })
+  const netId = Number(match.groups.netId)
+
+  return { currency: match.groups.currency, amount: match.groups.amount, netId, deposit }
+}
+
 /**
 * Init web3, contracts, and snark
 */
-async function init() {
-  let contractJson, erc20ContractJson, erc20tornadoJson
+async function init({ rpc, noteNetId, currency = 'dai', amount = '100' }) {
+  let contractJson, erc20ContractJson, erc20tornadoJson, tornadoAddress, tokenAddress
+  // TODO do we need this? should it work in browser really?
  if (inBrowser) {
    // Initialize using injected web3 (Metamask)
    // To assemble web version run `npm run browserify`
@ -279,187 +372,128 @@ async function init() {
    contractJson = await (await fetch('build/contracts/ETHTornado.json')).json()
    circuit = await (await fetch('build/circuits/withdraw.json')).json()
    proving_key = await (await fetch('build/circuits/withdraw_proving_key.bin')).arrayBuffer()
-    MERKLE_TREE_HEIGHT = 16
+    MERKLE_TREE_HEIGHT = 20
    ETH_AMOUNT = 1e18
    TOKEN_AMOUNT = 1e19
+    senderAccount = (await web3.eth.getAccounts())[0]
  } else {
    // Initialize from local node
-    web3 = new Web3('http://localhost:8545', null, { transactionConfirmationBlocks: 1 })
+    web3 = new Web3(rpc, null, { transactionConfirmationBlocks: 1 })
    contractJson = require('./build/contracts/ETHTornado.json')
    circuit = require('./build/circuits/withdraw.json')
    proving_key = fs.readFileSync('build/circuits/withdraw_proving_key.bin').buffer
-    require('dotenv').config()
    MERKLE_TREE_HEIGHT = process.env.MERKLE_TREE_HEIGHT
    ETH_AMOUNT = process.env.ETH_AMOUNT
    TOKEN_AMOUNT = process.env.TOKEN_AMOUNT
-    ERC20_TOKEN = process.env.ERC20_TOKEN
+    PRIVATE_KEY = process.env.PRIVATE_KEY
    erc20ContractJson = require('./build/contracts/ERC20Mock.json')
    erc20tornadoJson = require('./build/contracts/ERC20Tornado.json')
+    const account = web3.eth.accounts.privateKeyToAccount('0x' + PRIVATE_KEY)
+    web3.eth.accounts.wallet.add('0x' + PRIVATE_KEY)
+    web3.eth.defaultAccount = account.address
+    senderAccount = account.address
  }
+  // groth16 initialises a lot of Promises that will never be resolved, that's why we need to use process.exit to terminate the CLI
  groth16 = await buildGroth16()
-  let netId = await web3.eth.net.getId()
-  if (contractJson.networks[netId]) {
-    const tx = await web3.eth.getTransaction(contractJson.networks[netId].transactionHash)
-    tornado = new web3.eth.Contract(contractJson.abi, contractJson.networks[netId].address)
-    tornado.deployedBlock = tx.blockNumber
+  netId = await web3.eth.net.getId()
+  if (noteNetId && Number(noteNetId) !== netId) {
+    throw new Error('This note is for a different network. Specify the --rpc option explicitly')
  }
+  isLocalRPC = netId > 42

-  const tx3 = await web3.eth.getTransaction(erc20tornadoJson.networks[netId].transactionHash)
-  erc20tornado = new web3.eth.Contract(erc20tornadoJson.abi, erc20tornadoJson.networks[netId].address)
-  erc20tornado.deployedBlock = tx3.blockNumber
-
-  if(ERC20_TOKEN === '') {
-    erc20 = new web3.eth.Contract(erc20ContractJson.abi, erc20ContractJson.networks[netId].address)
-    const tx2 = await web3.eth.getTransaction(erc20ContractJson.networks[netId].transactionHash)
-    erc20.deployedBlock = tx2.blockNumber
-  }
-
-  senderAccount = (await web3.eth.getAccounts())[0]
-  console.log('Loaded')
-}
-
-// ========== CLI related stuff below ==============
-
-/** Print command line help */
-function printHelp(code = 0) {
-  console.log(`Usage:
-  Submit a deposit from default eth account and return the resulting note
-  $ ./cli.js deposit
-  $ ./cli.js depositErc20
-
-  Withdraw a note to 'recipient' account
-  $ ./cli.js withdraw <note> <recipient> [relayUrl]
-  $ ./cli.js withdrawErc20 <note> <recipient> [relayUrl]
-
-  Check address balance
-  $ ./cli.js balance <address>
-
-  Perform an automated test
-  $ ./cli.js test
-  $ ./cli.js testRelay
-
-Example:
-  $ ./cli.js deposit
-  ...
-  Your note: 0x1941fa999e2b4bfeec3ce53c2440c3bc991b1b84c9bb650ea19f8331baf621001e696487e2a2ee54541fa12f49498d71e24d00b1731a8ccd4f5f5126f3d9f400
-
-  $ ./cli.js withdraw 0x1941fa999e2b4bfeec3ce53c2440c3bc991b1b84c9bb650ea19f8331baf621001e696487e2a2ee54541fa12f49498d71e24d00b1731a8ccd4f5f5126f3d9f400 0xee6249BA80596A4890D1BD84dbf5E4322eA4E7f0
-`)
-  process.exit(code)
-}
-
-/** Process command line args and run */
-async function runConsole(args) {
-  if (args.length === 0) {
-    printHelp()
+  if (isLocalRPC) {
+    tornadoAddress = currency === 'eth' ? contractJson.networks[netId].address : erc20tornadoJson.networks[netId].address
+    tokenAddress = currency !== 'eth' ? erc20ContractJson.networks[netId].address : null
+    senderAccount = (await web3.eth.getAccounts())[0]
  } else {
-    switch (args[0]) {
-    case 'deposit':
-      if (args.length === 1) {
-        await init()
-        await printBalance(tornado._address, 'Tornado')
-        await printBalance(senderAccount, 'Sender account')
-        await deposit()
-        await printBalance(tornado._address, 'Tornado')
-        await printBalance(senderAccount, 'Sender account')
-      } else {
-        printHelp(1)
+    try{
+      tornadoAddress = config.deployments[`netId${netId}`][currency].instanceAddress[amount]
+      if (!tornadoAddress) {
+        throw new Error()
      }
-      break
-    case 'depositErc20':
-      if (args.length === 1) {
-        await init()
-        await printBalance(erc20tornado._address, 'Tornado')
-        await printBalance(senderAccount, 'Sender account')
-        await depositErc20()
-        await printBalance(erc20tornado._address, 'Tornado')
-        await printBalance(senderAccount, 'Sender account')
-      } else {
-        printHelp(1)
-      }
-      break
-    case 'balance':
-      if (args.length === 2 && /^0x[0-9a-fA-F]{40}$/.test(args[1])) {
-        await init()
-        await printBalance(args[1])
-      } else {
-        printHelp(1)
-      }
-      break
-    case 'withdraw':
-      if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
-        await init()
-        await printBalance(tornado._address, 'Tornado')
-        await printBalance(args[2], 'Recipient account')
-        if (args[3]) {
-          await withdrawRelay(args[1], args[2], args[3])
-        } else {
-          await withdraw(args[1], args[2])
+      tokenAddress = config.deployments[`netId${netId}`][currency].tokenAddress
+    } catch(e) {
+      console.error('There is no such tornado instance, check the currency and amount you provide')
+      process.exit(1)
+    }
+  }
+  tornado = new web3.eth.Contract(contractJson.abi, tornadoAddress)
+  erc20 = currency !== 'eth' ? new web3.eth.Contract(erc20ContractJson.abi, tokenAddress) : {}
+}
+
+async function main() {
+  if (inBrowser) {
+    const instance = { currency: 'eth', amount: '0.1' }
+    await init(instance)
+    window.deposit = async () => {
+      await deposit(instance)
+    }
+    window.withdraw = async () => {
+      const noteString = prompt('Enter the note to withdraw')
+      const recipient = (await web3.eth.getAccounts())[0]
+
+      const { currency, amount, netId, deposit } = parseNote(noteString)
+      await init({ noteNetId: netId, currency, amount })
+      await withdraw({ deposit, currency, amount, recipient })
+    }
+  } else {
+    program
+      .option('-r, --rpc <URL>', 'The RPC, CLI should interact with', 'http://localhost:8545')
+      .option('-R, --relayer <URL>', 'Withdraw via relayer')
+    program
+      .command('deposit <currency> <amount>')
+      .description('Submit a deposit of specified currency and amount from default eth account and return the resulting note. The currency is one of (ETH|DAI|cDAI|USDC|cUSDC|USDT). The amount depends on currency, see config.js file or visit https://tornado.cash.')
+      .action(async (currency, amount) => {
+        currency = currency.toLowerCase()
+        await init({ rpc: program.rpc, currency, amount })
+        await deposit({ currency, amount })
+      })
+    program
+      .command('withdraw <note> <recipient> [ETH_purchase]')
+      .description('Withdraw a note to a recipient account using relayer or specified private key. You can exchange some of your deposit`s tokens to ETH during the withdrawal by specifing ETH_purchase (e.g. 0.01) to pay for gas in future transactions. Also see the --relayer option.')
+      .action(async (noteString, recipient, refund) => {
+        const { currency, amount, netId, deposit } = parseNote(noteString)
+        await init({ rpc: program.rpc, noteNetId: netId, currency, amount })
+        await withdraw({ deposit, currency, amount, recipient, refund, relayerURL: program.relayer })
+      })
+    program
+      .command('balance <address> [token_address]')
+      .description('Check ETH and ERC20 balance')
+      .action(async (address, tokenAddress) => {
+        await init({ rpc: program.rpc })
+        await printETHBalance({ address, name: '' })
+        if (tokenAddress) {
+          await printERC20Balance({ address, name: '', tokenAddress })
        }
-        await printBalance(tornado._address, 'Tornado')
-        await printBalance(args[2], 'Recipient account')
-      } else {
-        printHelp(1)
-      }
-      break
-    case 'withdrawErc20':
-      if (args.length >= 3 && args.length <= 4 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) {
-        await init()
-        await printBalance(erc20tornado._address, 'Tornado')
-        await printBalance(args[2], 'Recipient account')
-        if (args[3]) {
-          await withdrawRelayErc20(args[1], args[2], args[3])
-        } else {
-          await withdrawErc20(args[1], args[2])
-        }
-        await printBalance(erc20tornado._address, 'Tornado')
-        await printBalance(args[2], 'Recipient account')
-      } else {
-        printHelp(1)
-      }
-      break
-    case 'test':
-      if (args.length === 1) {
-        await init()
-        const note1 = await deposit()
-        await withdraw(note1, senderAccount)
+      })
+    program
+      .command('test')
+      .description('Perform an automated test. It deposits and withdraws one ETH and one ERC20 note. Uses ganache.')
+      .action(async () => {
+        console.log('Start performing ETH deposit-withdraw test')
+        let currency = 'eth'
+        let amount = '0.1'
+        await init({ rpc: program.rpc, currency, amount })
+        let noteString = await deposit({ currency, amount })
+        let parsedNote = parseNote(noteString)
+        await withdraw({ deposit: parsedNote.deposit, currency, amount, recipient: senderAccount, relayerURL: program.relayer })

-        const note2 = await depositErc20()
-        await withdrawErc20(note2, senderAccount)
-      } else {
-        printHelp(1)
-      }
-      break
-    case 'testRelay':
-      if (args.length === 1) {
-        await init()
-        const note1 = await deposit()
-        await withdrawRelay(note1, senderAccount, 'http://localhost:8000')
-
-        const note2 = await depositErc20()
-        await withdrawRelayErc20(note2, senderAccount, 'http://localhost:8000')
-      } else {
-        printHelp(1)
-      }
-      break
-
-    default:
-      printHelp(1)
+        console.log('\nStart performing DAI deposit-withdraw test')
+        currency = 'dai'
+        amount = '100'
+        await init({ rpc: program.rpc, currency, amount })
+        noteString = await deposit({ currency, amount })
+        ;(parsedNote = parseNote(noteString))
+        await withdraw({ deposit: parsedNote.deposit, currency, amount, recipient: senderAccount, refund: '0.02', relayerURL: program.relayer })
+      })
+    try {
+      await program.parseAsync(process.argv)
+      process.exit(0)
+    } catch(e) {
+      console.log('Error:', e)
+      process.exit(1)
    }
  }
 }

-if (inBrowser) {
-  window.deposit = deposit
-  window.depositErc20 = depositErc20
-  window.withdraw = async () => {
-    const note = prompt('Enter the note to withdraw')
-    const recipient = (await web3.eth.getAccounts())[0]
-    await withdraw(note, recipient)
-  }
-  init()
-} else {
-  runConsole(process.argv.slice(2))
-    .then(() => process.exit(0))
-    .catch(err => { console.log(err); process.exit(1) })
-}
+main()
--- a/config.js
+++ b/config.js
@ -0,0 +1,140 @@
+require('dotenv').config()
+
+module.exports = {
+  deployments: {
+    netId1: {
+      eth: {
+        instanceAddress: {
+          '0.1': '0x12D66f87A04A9E220743712cE6d9bB1B5616B8Fc',
+          '1': '0x47CE0C6eD5B0Ce3d3A51fdb1C52DC66a7c3c2936',
+          '10': '0x910Cbd523D972eb0a6f4cAe4618aD62622b39DbF',
+          '100': '0xA160cdAB225685dA1d56aa342Ad8841c3b53f291'
+        },
+        symbol: 'ETH',
+        decimals: 18
+      },
+      dai: {
+        instanceAddress: {
+          '100': '0xD4B88Df4D29F5CedD6857912842cff3b20C8Cfa3',
+          '1000': '0xFD8610d20aA15b7B2E3Be39B396a1bC3516c7144',
+          '10000': '0xF60dD140cFf0706bAE9Cd734Ac3ae76AD9eBC32A',
+          '100000': undefined
+        },
+        tokenAddress: '0x6B175474E89094C44Da98b954EedeAC495271d0F',
+        symbol: 'DAI',
+        decimals: 18
+      },
+      cdai: {
+        instanceAddress: {
+          '5000': '0x22aaA7720ddd5388A3c0A3333430953C68f1849b',
+          '50000': '0xBA214C1c1928a32Bffe790263E38B4Af9bFCD659',
+          '500000': '0xb1C8094B234DcE6e03f10a5b673c1d8C69739A00',
+          '5000000': undefined
+        },
+        tokenAddress: '0x5d3a536E4D6DbD6114cc1Ead35777bAB948E3643',
+        symbol: 'cDAI',
+        decimals: 8
+      },
+      usdc: {
+        instanceAddress: {
+          '100': '0xd96f2B1c14Db8458374d9Aca76E26c3D18364307',
+          '1000': '0x4736dCf1b7A3d580672CcE6E7c65cd5cc9cFBa9D',
+          '10000': '0xD691F27f38B395864Ea86CfC7253969B409c362d',
+          '100000': undefined
+        },
+        tokenAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
+        symbol: 'USDC',
+        decimals: 6
+      },
+      cusdc: {
+        instanceAddress: {
+          '5000': '0xaEaaC358560e11f52454D997AAFF2c5731B6f8a6',
+          '50000': '0x1356c899D8C9467C7f71C195612F8A395aBf2f0a',
+          '500000': '0xA60C772958a3eD56c1F15dD055bA37AC8e523a0D',
+          '5000000': undefined
+        },
+        tokenAddress: '0x39AA39c021dfbaE8faC545936693aC917d5E7563',
+        symbol: 'cUSDC',
+        decimals: 8
+      },
+      usdt: {
+        instanceAddress: {
+          '100': '0x169AD27A470D064DEDE56a2D3ff727986b15D52B',
+          '1000': '0x0836222F2B2B24A3F36f98668Ed8F0B38D1a872f',
+          '10000': '0xF67721A2D8F736E75a49FdD7FAd2e31D8676542a',
+          '100000': '0x9AD122c22B14202B4490eDAf288FDb3C7cb3ff5E'
+        },
+        tokenAddress: '0xdAC17F958D2ee523a2206206994597C13D831ec7',
+        symbol: 'USDT',
+        decimals: 6
+      }
+    },
+    netId42: {
+      eth: {
+        instanceAddress: {
+          '0.1': '0x8b3f5393bA08c24cc7ff5A66a832562aAB7bC95f',
+          '1': '0xD6a6AC46d02253c938B96D12BE439F570227aE8E',
+          '10': '0xe1BE96331391E519471100c3c1528B66B8F4e5a7',
+          '100': '0xd037E0Ac98Dab2fCb7E296c69C6e52767Ae5414D'
+        },
+        symbol: 'ETH',
+        decimals: 18
+      },
+      dai: {
+        instanceAddress: {
+          '100': '0xdf2d3cC5F361CF95b3f62c4bB66deFe3FDE47e3D',
+          '1000': '0xD96291dFa35d180a71964D0894a1Ae54247C4ccD',
+          '10000': '0xb192794f72EA45e33C3DF6fe212B9c18f6F45AE3',
+          '100000': undefined
+        },
+        tokenAddress: '0x4F96Fe3b7A6Cf9725f59d353F723c1bDb64CA6Aa',
+        symbol: 'DAI',
+        decimals: 18
+      },
+      cdai: {
+        instanceAddress: {
+          '5000': '0x6Fc9386ABAf83147b3a89C36D422c625F44121C8',
+          '50000': '0x7182EA067e0f050997444FCb065985Fd677C16b6',
+          '500000': '0xC22ceFd90fbd1FdEeE554AE6Cc671179BC3b10Ae',
+          '5000000': undefined
+        },
+        tokenAddress: '0xe7bc397DBd069fC7d0109C0636d06888bb50668c',
+        symbol: 'cDAI',
+        decimals: 8
+      },
+      usdc: {
+        instanceAddress: {
+          '100': '0x137E2B6d185018e7f09f6cf175a970e7fC73826C',
+          '1000': '0xcC7f1633A5068E86E3830e692e3e3f8f520525Af',
+          '10000': '0x28C8f149a0ab8A9bdB006B8F984fFFCCE52ef5EF',
+          '100000': undefined
+        },
+        tokenAddress: '0x75B0622Cec14130172EaE9Cf166B92E5C112FaFF',
+        symbol: 'USDC',
+        decimals: 6
+      },
+      cusdc: {
+        instanceAddress: {
+          '5000': '0xc0648F28ABA385c8a1421Bbf1B59e3c474F89cB0',
+          '50000': '0x0C53853379c6b1A7B74E0A324AcbDD5Eabd4981D',
+          '500000': '0xf84016A0E03917cBe700D318EB1b7a53e6e3dEe1',
+          '5000000': undefined
+        },
+        tokenAddress: '0xcfC9bB230F00bFFDB560fCe2428b4E05F3442E35',
+        symbol: 'cUSDC',
+        decimals: 8
+      },
+      usdt: {
+        instanceAddress: {
+          '100': '0x327853Da7916a6A0935563FB1919A48843036b42',
+          '1000': '0x531AA4DF5858EA1d0031Dad16e3274609DE5AcC0',
+          '10000': '0x0958275F0362cf6f07D21373aEE0cf37dFe415dD',
+          '100000': '0x14aEd24B67EaF3FF28503eB92aeb217C47514364'
+        },
+        tokenAddress: '0x03c5F29e9296006876d8DF210BCFfD7EA5Db1Cf1',
+        symbol: 'USDT',
+        decimals: 6
+      }
+    }
+  }
+}
--- a/downloadKeys.js
+++ b/downloadKeys.js
@ -0,0 +1,43 @@
+const axios = require('axios')
+const path = require('path')
+const fs = require('fs')
+const files = ['withdraw.json', 'withdraw_proving_key.bin', 'Verifier.sol', 'withdraw_verification_key.json']
+const circuitsPath = 'build/circuits'
+const contractsPath = 'build/contracts'
+
+async function downloadFile({ url, path }) {
+  const writer = fs.createWriteStream(path)
+
+  const response = await axios({
+    url,
+    method: 'GET',
+    responseType: 'stream'
+  })
+
+  response.data.pipe(writer)
+
+  return new Promise((resolve, reject) => {
+    writer.on('finish', resolve)
+    writer.on('error', reject)
+  })
+}
+
+async function main() {
+  const release = await axios.get('https://api.github.com/repos/tornadocash/tornado-core/releases/latest')
+  const { assets } = release.data
+  if (!fs.existsSync(circuitsPath)){
+    fs.mkdirSync(circuitsPath, { recursive: true })
+    fs.mkdirSync(contractsPath, { recursive: true })
+  }
+  for(let asset of assets) {
+    if (files.includes(asset.name)) {
+      console.log(`Downloading ${asset.name} ...`)
+      await downloadFile({
+        url: asset.browser_download_url,
+        path: path.resolve(__dirname, circuitsPath, asset.name)
+      })
+    }
+  }
+}
+
+main()
--- a/package-lock.json
+++ b/package-lock.json
@ -1809,12 +1809,9 @@
      }
    },
    "commander": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
-      "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
-      "requires": {
-        "graceful-readlink": ">= 1.0.0"
-      }
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-4.1.1.tgz",
+      "integrity": "sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA=="
    },
    "concat-map": {
      "version": "0.0.1",
@ -6259,6 +6256,16 @@
      "integrity": "sha1-z+kXyz0nS8/6x5J1ivUxc+sfq9w=",
      "requires": {
        "commander": "~2.8.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.8.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
+          "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
+          "requires": {
+            "graceful-readlink": ">= 1.0.0"
+          }
+        }
      }
    },
    "semaphore": {
--- a/package.json
+++ b/package.json
@ -20,7 +20,8 @@
    "migrate:rinkeby": "npx truffle migrate --network rinkeby --reset",
    "migrate:mainnet": "npx truffle migrate --network mainnet",
    "eslint": "npx eslint --ignore-path .gitignore .",
-    "flat": "npx truffle-flattener contracts/ETHTornado.sol > ETHTornado_flat.sol && npx truffle-flattener contracts/ERC20Tornado.sol > ERC20Tornado_flat.sol"
+    "flat": "npx truffle-flattener contracts/ETHTornado.sol > ETHTornado_flat.sol && npx truffle-flattener contracts/ERC20Tornado.sol > ERC20Tornado_flat.sol",
+    "download": "node downloadKeys.js"
  },
  "keywords": [],
  "author": "",
@ -37,6 +38,7 @@
    "chai-as-promised": "^7.1.1",
    "circom": "0.0.34",
    "circomlib": "git+https://github.com/tornadocash/circomlib.git#347822604996bf25f659f96ee0f02810a1f71bb0",
+    "commander": "^4.1.1",
    "dotenv": "^8.2.0",
    "eslint": "^6.6.0",
    "ganache-cli": "^6.7.0",