diff --git a/README.md b/README.md
index d8f2cc4..40f8d96 100644
--- a/README.md
+++ b/README.md
@@ -5,40 +5,29 @@
 2. `cp .env.example .env`
 3. Modify `.env` as needed
 
+## Deploy Kovan
+1. `cp .env.example deploy/kovan/.env`
+2. Modify `.env` as needed
+3. `docker-compose -p kovan up -d`
+
 ## Run locally
 1. `npm run start`
-2. `curl -X POST -H 'content-type:application/json' --data '<PROOF>' http://127.0.0.1:8000/relay`
+2. `curl -X POST -H 'content-type:application/json' --data '<input data>' http://127.0.0.1:8000/relay`
 Relayer should return a transaction hash.
 
-## Running in Docker
 
-To run a relayer in Docker simply run this command: 
-
-```sh
-docker run -d -e NET_ID=<...> -e RPC_URL=<...> -e PRIVATE_KEY=<...> -e ETH_MIXER_ADDRESS=<...> -e DAI_MIXER_ADDRESS=<...> peppersec/tornado-mixer-relayer
-```
-
-## Proof example
+## Input data example
 ```json
 {
-  "contract": "0xf15f151CEf196E4a2dC28De496811e435552E93e",
-  "proof": {
-    "proof":[
-      "0x0ed9b1afc791a551f5baa2f84786963b1463ca3f7c68eb0de3b267e6cb491f05",
-      "0x1335f2af3c71e442fd82f63f8f1c605ca2612b8d0fa22b4cbd1239cca839aa3d",
-      "0x1abb4b71da0efa67cbc76a97ac360826b17a88f07bd89151258bf076474a4804",
-      "0x000189f7f1067a768d116cd86980eae6963dd9bc6c1f8204ceacf90a94f60d81",
-      "0x15b11f9f5441adeea61534105902170a409b228e159fe7428abf6e863fc05273",
-      "0x0526b509ba2cda2b21b09401d70d23ea0225be4fdaa9097af842ff6783d1e0f4",
-      "0x2cd9a2305827f7da64aa1a3136c11ae1d3d7b3cb69832d8c04ab39d8b9393cda",
-      "0x2090cd3f9d09d66ca4e1e9bed2c72d5fa174b47599cb47e572324b1a98a3cb7a"
+    "proof": "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",
+    "args": [
+        "0x1579d41e5290ab5bcec9a7df16705e49b5c0b869095299196c19c5e14462c9e3",
+        "0x0cf7f49c5b35c48b9e1d43713e0b46a75977e3d10521e9ac1e4c3cd5e3da1c5d",
+        "0x03ebd0748aa4d1457cf479cce56309641e0a98f5",
+        "0xbd4369dc854c5d5b79fe25492e3a3cfcb5d02da5",
+        "0x000000000000000000000000000000000000000000000000058d15e176280000",
+        "0x0000000000000000000000000000000000000000000000000000000000000000"
     ],
-    "publicSignals":[
-      "0x1e8a85160889dfb5c03a8e2a6cca18b4c476c0b486003e9ed666a33e04114658",
-      "0x00bfb0befe19eac571ecaf7858e50d70273fbe2952cc8431f59399bb28665796",
-      "0x00000000000000000000000003ebd0748aa4d1457cf479cce56309641e0a98f5",
-      "0x0000000000000000000000000000000000000000000000000000000000000000"
-    ]
-  }
+    "contract": "0xA27E34Ad97F171846bAf21399c370c9CE6129e0D"
 }
 ```
diff --git a/abis/mixerABI.json b/abis/mixerABI.json
index 8a53c34..8879c61 100644
--- a/abis/mixerABI.json
+++ b/abis/mixerABI.json
@@ -1,4 +1,19 @@
 [
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "_newOperator",
+        "type": "address"
+      }
+    ],
+    "name": "changeOperator",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
   {
     "constant": true,
     "inputs": [
@@ -20,6 +35,51 @@
     "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": [],
@@ -76,21 +136,6 @@
     "stateMutability": "view",
     "type": "function"
   },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "isVerifierUpdateDisabled",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "payable": false,
-    "stateMutability": "view",
-    "type": "function"
-  },
   {
     "constant": true,
     "inputs": [],
@@ -193,6 +238,36 @@
     "stateMutability": "view",
     "type": "function"
   },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "_newVerifier",
+        "type": "address"
+      }
+    ],
+    "name": "updateVerifier",
+    "outputs": [],
+    "payable": false,
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "constant": false,
+    "inputs": [
+      {
+        "internalType": "bytes32",
+        "name": "_commitment",
+        "type": "bytes32"
+      }
+    ],
+    "name": "deposit",
+    "outputs": [],
+    "payable": true,
+    "stateMutability": "payable",
+    "type": "function"
+  },
   {
     "constant": true,
     "inputs": [],
@@ -244,6 +319,27 @@
     "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": [
@@ -280,21 +376,6 @@
     "stateMutability": "view",
     "type": "function"
   },
-  {
-    "constant": true,
-    "inputs": [],
-    "name": "isDepositsDisabled",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "payable": false,
-    "stateMutability": "view",
-    "type": "function"
-  },
   {
     "constant": true,
     "inputs": [
@@ -413,140 +494,5 @@
     ],
     "name": "Withdrawal",
     "type": "event"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      {
-        "internalType": "bytes32",
-        "name": "_commitment",
-        "type": "bytes32"
-      }
-    ],
-    "name": "deposit",
-    "outputs": [],
-    "payable": true,
-    "stateMutability": "payable",
-    "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": "bytes32",
-        "name": "_nullifierHash",
-        "type": "bytes32"
-      }
-    ],
-    "name": "isSpent",
-    "outputs": [
-      {
-        "internalType": "bool",
-        "name": "",
-        "type": "bool"
-      }
-    ],
-    "payable": false,
-    "stateMutability": "view",
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      {
-        "internalType": "bool",
-        "name": "_state",
-        "type": "bool"
-      }
-    ],
-    "name": "toggleDeposits",
-    "outputs": [],
-    "payable": false,
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      {
-        "internalType": "address",
-        "name": "_newVerifier",
-        "type": "address"
-      }
-    ],
-    "name": "updateVerifier",
-    "outputs": [],
-    "payable": false,
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [],
-    "name": "disableVerifierUpdate",
-    "outputs": [],
-    "payable": false,
-    "stateMutability": "nonpayable",
-    "type": "function"
-  },
-  {
-    "constant": false,
-    "inputs": [
-      {
-        "internalType": "address",
-        "name": "_newOperator",
-        "type": "address"
-      }
-    ],
-    "name": "changeOperator",
-    "outputs": [],
-    "payable": false,
-    "stateMutability": "nonpayable",
-    "type": "function"
   }
-]
\ No newline at end of file
+]
diff --git a/index.js b/index.js
index 82424d9..8851e04 100644
--- a/index.js
+++ b/index.js
@@ -1,6 +1,6 @@
 const { numberToHex, toWei, toHex, toBN, toChecksumAddress } = require('web3-utils')
-const { netId, rpcUrl, privateKey, defaultGasPrice } = require('./config')
-const { fetchGasPrice, isValidProof, fetchDAIprice, isKnownContract } = require('./utils')
+const { netId, rpcUrl, privateKey, mixers, defaultGasPrice } = require('./config')
+const { fetchGasPrice, isValidProof, isValidArgs, fetchDAIprice, isKnownContract } = require('./utils')
 const Web3 = require('web3')
 const express = require('express')
 
@@ -37,35 +37,41 @@ app.get('/', function (req, res) {
 })
 
 app.get('/status', function (req, res) {
-  res.json({ relayerAddress: web3.eth.defaultAccount, gasPrices, netId, ethPriceInDai })
+  res.json({ relayerAddress: web3.eth.defaultAccount, mixers, gasPrices, netId, ethPriceInDai })
 })
 
 app.post('/relay', async (req, resp) => {
-  let { valid , reason } = isValidProof(req.body.proof)
+  const { proof, args, contract } = req.body
+  let { valid , reason } = isValidProof(proof)
   if (!valid) {
     console.log('Proof is invalid:', reason)
     return resp.status(400).json({ error: 'Proof format is invalid' })
   }
 
-  let currency
-  ( { valid, currency } = isKnownContract(req.body.contract))
+  ({ valid , reason } = isValidArgs(args))
   if (!valid) {
-    console.log('Contract does not exist:', req.body.contract)
+    console.log('Args are invalid:', reason)
+    return resp.status(400).json({ error: 'Withdraw arguments are invalid' })
+  }
+
+  let currency
+  ( { valid, currency } = isKnownContract(contract))
+  if (!valid) {
+    console.log('Contract does not exist:', contract)
     return resp.status(400).json({ error: 'This relayer does not support the token' })
   }
 
-  let { proof, publicSignals } = req.body.proof
-  const args = {
-    root: publicSignals[0],
-    nullifierHash: publicSignals[1],
-    recipient: toChecksumAddress(publicSignals[2]),
-    relayer: toChecksumAddress(publicSignals[3]),
-    fee: toBN(publicSignals[4]),
-    refund: toBN(publicSignals[5]),
-  }
+  const [ root, nullifierHash, recipient, relayer, fee, refund ] = [
+    args[0],
+    args[1],
+    toChecksumAddress(args[2]),
+    toChecksumAddress(args[3]),
+    toBN(args[4]),
+    toBN(args[5])
+  ]
 
-  if (args.relayer !== web3.eth.defaultAccount) {
-    console.log('This proof is for different relayer:', args.relayer)
+  if (relayer !== web3.eth.defaultAccount) {
+    console.log('This proof is for different relayer:', relayer)
     return resp.status(400).json({ error: 'Relayer address is invalid' })
   }
 
@@ -73,43 +79,56 @@ app.post('/relay', async (req, resp) => {
   let desiredFee
   switch (currency) {
     case 'eth': {
-      if (!args.refund.isZero()) {
+      if (!refund.isZero()) {
         return resp.status(400).json({ error: 'Cannot send refund for eth currency.' })
       }
       desiredFee = expense
       break
     }
     case 'dai': {
-      desiredFee = expense.add(args.refund).mul(toBN(ethPriceInDai)).div(toBN(10 ** 18))
+      desiredFee = expense.add(refund).mul(toBN(ethPriceInDai)).div(toBN(10 ** 18))
       break
     }
   }
 
-  if (args.fee.lt(desiredFee)) {
+  if (fee.lt(desiredFee)) {
     console.log('Fee is too low')
     return resp.status(400).json({ error: 'Fee is too low. Try to resend.' })
   }
 
   try {
     const mixer = new web3.eth.Contract(mixerABI, req.body.contract)
-    const isSpent = await mixer.methods.isSpent(args.nullifierHash).call()
+    const isSpent = await mixer.methods.isSpent(nullifierHash).call()
     if (isSpent) {
       return resp.status(400).json({ error: 'The note has been spent.' })
     }
-    const isKnownRoot = await mixer.methods.isKnownRoot(args.root).call()
+    const isKnownRoot = await mixer.methods.isKnownRoot(root).call()
     if (!isKnownRoot) {
       return resp.status(400).json({ error: 'The merkle root is too old or invalid.' })
     }
-    const gas = await mixer.methods.withdraw(proof, ...publicSignals).estimateGas({ from: web3.eth.defaultAccount, value: args.refund })
-    const result = mixer.methods.withdraw(proof, ...publicSignals).send({
+    const withdrawArgs = [
+      proof,
+      root,
+      nullifierHash,
+      recipient,
+      relayer,
+      fee.toString(),
+      refund.toString()
+    ]
+    const gas = await mixer.methods.withdraw(...withdrawArgs).estimateGas({ 
       from: web3.eth.defaultAccount,
-      value: args.refund,
+      value: refund 
+    })
+    const result = mixer.methods.withdraw(...withdrawArgs).send({
+      from: web3.eth.defaultAccount,
+      value: refund,
       gas: numberToHex(gas + 50000),
       gasPrice: toHex(toWei(gasPrices.fast.toString(), 'gwei')),
       // TODO: nonce
     })
-    result.once('transactionHash', function(hash){
-      resp.json({ txHash: hash })
+    result.once('transactionHash', function(txHash){
+      resp.json({ txHash })
+      console.log(`A new successfuly sent tx ${txHash} for the ${recipient}`)
     }).on('error', function(e){
       console.log(e)
       return resp.status(400).json({ error: 'Proof is malformed.' })
@@ -127,3 +146,10 @@ if (Number(netId) === 1) {
   fetchDAIprice({ ethPriceInDai, web3 })
   console.log('Gas price oracle started.')
 }
+
+console.log('Relayer started')
+console.log(`relayerAddress: ${web3.eth.defaultAccount}`)
+console.log(`mixers: ${JSON.stringify(mixers)}`)
+console.log(`gasPrices: ${JSON.stringify(gasPrices)}`)
+console.log(`netId: ${netId}`)
+console.log(`ethPriceInDai: ${ethPriceInDai}`)
\ No newline at end of file
diff --git a/utils.js b/utils.js
index af8299b..bf1b9fb 100644
--- a/utils.js
+++ b/utils.js
@@ -42,34 +42,43 @@ async function fetchDAIprice({ ethPriceInDai, web3 }) {
   }
 }
 
-function isValidProof(data) {
+function isValidProof(proof) {
   // validator expects `websnarkUtils.toSolidityInput(proof)` output
 
-  if (!(data.proof && data.publicSignals)) {
-    return { valid: false, reason: 'One of inputs is empty. There must be proof and publicSignals' }
+  if (!(proof)) {
+    return { valid: false, reason: 'The proof is empty.' }
   }
 
-  if (!isHexStrict(data.proof) || data.proof.length !== 2 + 2 * 8 * 32) {
+  if (!isHexStrict(proof) || proof.length !== 2 + 2 * 8 * 32) {
     return { valid: false, reason: 'Corrupted proof' }
   }
 
-  if (data.publicSignals.length !== 6) {
-    return { valid: false, reason: 'Corrupted publicSignals' }
+  return { valid: true }
+}
+
+function isValidArgs(args) {
+
+  if (!(args)) {
+    return { valid: false, reason: 'Args are empty' }
   }
 
-  for(let signal of data.publicSignals) {
+  if (args.length !== 6) {
+    return { valid: false, reason: 'Length of args is lower than 6' }
+  }
+
+  for(let signal of args) {
     if (!isHexStrict(signal)) {
-      return { valid: false, reason: 'Corrupted publicSignals' }
+      return { valid: false, reason: `Corrupted signal ${signal}` }
     }
   }
 
-  if (data.publicSignals[0].length !== 66 ||
-      data.publicSignals[1].length !== 66 ||
-      data.publicSignals[2].length !== 42 ||
-      data.publicSignals[3].length !== 42 ||
-      data.publicSignals[4].length !== 66 ||
-      data.publicSignals[5].length !== 66) {
-    return { valid: false, reason: 'Corrupted publicSignals' }
+  if (args[0].length !== 66 ||
+      args[1].length !== 66 ||
+      args[2].length !== 42 ||
+      args[3].length !== 42 ||
+      args[4].length !== 66 ||
+      args[5].length !== 66) {
+    return { valid: false, reason: 'The length one of the signals is incorrect' }
   }
 
   return { valid: true }
@@ -88,4 +97,4 @@ function sleep(ms) {
   return new Promise(resolve => setTimeout(resolve, ms))
 }
 
-module.exports = { fetchGasPrice, isValidProof, sleep, fetchDAIprice, isKnownContract }
+module.exports = { fetchGasPrice, isValidProof, isValidArgs, sleep, fetchDAIprice, isKnownContract }