Contract 0xF67721A2D8F736E75a49FdD7FAd2e31D8676542a

Tornado.Cash OFAC Sanctions Lists 
 
 
Txn Hash
Method
Block
From
To
Value
0xd1bb562435ca20e72b5790c2c7ee6cf82e7109c94bebd1b43643b736143076bfWithdraw100209202020-05-07 19:08:24934 days 10 hrs ago0xe0f87651d3b65641c0fe1b71c5fbe88236d4b2e6 IN  Tornado.Cash: 10,000 USDT0.02 Ether0.0006853619.2
0x0e2ad47c4722713829ff755b206375b24496ebe3622c6624ffdc28d50947440aWithdraw100208902020-05-07 19:04:08934 days 10 hrs ago0x0f416bc2d310a1c32bc1081cf354c15fd10d4802 IN  Tornado.Cash: 10,000 USDT0 Ether0.0006858219.2
0xc7c47ddd69bc6dc9d6b80f7aaf58ad790e3d126f8b61fdbaad59aefa7a7603bdWithdraw100198002020-05-07 15:02:19934 days 14 hrs ago0x41a28335c5075c81502a97cebad597f28728a815 IN  Tornado.Cash: 10,000 USDT0.02 Ether0.0080332323.1
0x61d651507b8bbf31bcce7446733583c92e2058c5c208cb2a09b285393e57f710Deposit100194042020-05-07 13:34:33934 days 15 hrs ago0xeb9005b3bab045eb065eb789cdc68259cbb2ebfd IN  Tornado.Cash: 10,000 USDT0 Ether0.0187086218
0x1581cf4aa4793169f7a0700eea42bc0ab68b41f118d553994dbb2e8d259f3da6Withdraw100108852020-05-06 5:45:09935 days 23 hrs ago0x0b157ac0a65319b0a18aa46b0b0d4497e1074456 IN  Tornado.Cash: 10,000 USDT0.02 Ether0.0034775910
0xcd536c965e1dd488e65b4b2c7bb49fc3550f0c2667f9eab7649794fc82b7d7d5Withdraw100108592020-05-06 5:38:46935 days 23 hrs ago0x0b157ac0a65319b0a18aa46b0b0d4497e1074456 IN  Tornado.Cash: 10,000 USDT0.02 Ether0.003399729
0xc26f6a753433271aae0ce49809958df6d9049ff0c779fc99514138da88c5a580Deposit100105742020-05-06 4:40:55936 days 43 mins ago0xb9835e5187e32449042afeed28567d844ded3895 IN  Tornado.Cash: 10,000 USDT0 Ether0.0144238614
0xf3ac018d52775d5c2df78941e613357fd7828b5fa471374ab77eb6857883eb66Deposit100105632020-05-06 4:37:34936 days 46 mins ago0xb9835e5187e32449042afeed28567d844ded3895 IN  Tornado.Cash: 10,000 USDT0 Ether0.0141112213.5
0x4fb6922dabbb9ea0f0ffb7290e2e48c881d12df11dcec78142fcd67d8beeeb14Withdraw99405192020-04-25 8:22:42946 days 21 hrs ago0x0f416bc2d310a1c32bc1081cf354c15fd10d4802 IN  Tornado.Cash: 10,000 USDT0.02 Ether0.002781978
0x2a9a90b0a3e6712f09faa0d942a33a6d0a00ddf45e8b4686090148071577f8c7Deposit99405072020-04-25 8:20:31946 days 21 hrs ago0x55ed4c92e6fb5b86ab1de7313a8384f9f00dc90b IN  Tornado.Cash: 10,000 USDT0 Ether0.0117732611.2
0x51b702b81c005a69e8caf5ff9f4494e9a0ee0353347c68d800cd950521d8cc840x6080604091620172019-12-25 18:37:171068 days 10 hrs agoTornado.Cash: Donate IN  Contract Creation0 Ether0.022456917
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Latest 4 internal transactions
Parent Txn Hash Block From To Value
0xc7c47ddd69bc6dc9d6b80f7aaf58ad790e3d126f8b61fdbaad59aefa7a7603bd100198002020-05-07 15:02:19934 days 14 hrs ago Tornado.Cash: 10,000 USDT0xd40a91f38b2c68579c7ba7560aa827806eb50bf00.02 Ether
0x1581cf4aa4793169f7a0700eea42bc0ab68b41f118d553994dbb2e8d259f3da6100108852020-05-06 5:45:09935 days 23 hrs ago Tornado.Cash: 10,000 USDT0x5ab523dc5965e29c049decbdefe5aa58d6bcff550.02 Ether
0xcd536c965e1dd488e65b4b2c7bb49fc3550f0c2667f9eab7649794fc82b7d7d5100108592020-05-06 5:38:46935 days 23 hrs ago Tornado.Cash: 10,000 USDT0x5ab523dc5965e29c049decbdefe5aa58d6bcff550.02 Ether
0x4fb6922dabbb9ea0f0ffb7290e2e48c881d12df11dcec78142fcd67d8beeeb1499405192020-04-25 8:22:42946 days 21 hrs ago Tornado.Cash: 10,000 USDT0x70db47c636fbf5fce46063e2dac8459a82c241f10.02 Ether
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This contract contains unverified libraries: Hasher
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0xd4b88df4d29f5cedd6857912842cff3b20c8cfa3

Contract Name:
TornadoCash_erc20

Compiler Version
v0.5.11+commit.c082d0b4

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license
/**
 *Submitted for verification at Etherscan.io on 2019-12-16
*/

// https://tornado.cash
/*
* d888888P                                           dP              a88888b.                   dP
*    88                                              88             d8'   `88                   88
*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.
*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88
*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88
*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP
* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
*/

pragma solidity ^0.5.8;

library Hasher {
  function MiMCSponge(uint256 in_xL, uint256 in_xR) public pure returns (uint256 xL, uint256 xR);
}

contract MerkleTreeWithHistory {
  uint256 public constant FIELD_SIZE = 21888242871839275222246405745257275088548364400416034343698204186575808495617;
  uint256 public constant ZERO_VALUE = 21663839004416932945382355908790599225266501822907911457504978515578255421292; // = keccak256("tornado") % FIELD_SIZE

  uint32 public levels;

  // the following variables are made public for easier testing and debugging and
  // are not supposed to be accessed in regular code
  bytes32[] public filledSubtrees;
  bytes32[] public zeros;
  uint32 public currentRootIndex = 0;
  uint32 public nextIndex = 0;
  uint32 public constant ROOT_HISTORY_SIZE = 100;
  bytes32[ROOT_HISTORY_SIZE] public roots;

  constructor(uint32 _treeLevels) public {
    require(_treeLevels > 0, "_treeLevels should be greater than zero");
    require(_treeLevels < 32, "_treeLevels should be less than 32");
    levels = _treeLevels;

    bytes32 currentZero = bytes32(ZERO_VALUE);
    zeros.push(currentZero);
    filledSubtrees.push(currentZero);

    for (uint32 i = 1; i < levels; i++) {
      currentZero = hashLeftRight(currentZero, currentZero);
      zeros.push(currentZero);
      filledSubtrees.push(currentZero);
    }

    roots[0] = hashLeftRight(currentZero, currentZero);
  }

  /**
    @dev Hash 2 tree leaves, returns MiMC(_left, _right)
  */
  function hashLeftRight(bytes32 _left, bytes32 _right) public pure returns (bytes32) {
    require(uint256(_left) < FIELD_SIZE, "_left should be inside the field");
    require(uint256(_right) < FIELD_SIZE, "_right should be inside the field");
    uint256 R = uint256(_left);
    uint256 C = 0;
    (R, C) = Hasher.MiMCSponge(R, C);
    R = addmod(R, uint256(_right), FIELD_SIZE);
    (R, C) = Hasher.MiMCSponge(R, C);
    return bytes32(R);
  }

  function _insert(bytes32 _leaf) internal returns(uint32 index) {
    uint32 currentIndex = nextIndex;
    require(currentIndex != uint32(2)**levels, "Merkle tree is full. No more leafs can be added");
    nextIndex += 1;
    bytes32 currentLevelHash = _leaf;
    bytes32 left;
    bytes32 right;

    for (uint32 i = 0; i < levels; i++) {
      if (currentIndex % 2 == 0) {
        left = currentLevelHash;
        right = zeros[i];

        filledSubtrees[i] = currentLevelHash;
      } else {
        left = filledSubtrees[i];
        right = currentLevelHash;
      }

      currentLevelHash = hashLeftRight(left, right);

      currentIndex /= 2;
    }

    currentRootIndex = (currentRootIndex + 1) % ROOT_HISTORY_SIZE;
    roots[currentRootIndex] = currentLevelHash;
    return nextIndex - 1;
  }

  /**
    @dev Whether the root is present in the root history
  */
  function isKnownRoot(bytes32 _root) public view returns(bool) {
    if (_root == 0) {
      return false;
    }
    uint32 i = currentRootIndex;
    do {
      if (_root == roots[i]) {
        return true;
      }
      if (i == 0) {
        i = ROOT_HISTORY_SIZE;
      }
      i--;
    } while (i != currentRootIndex);
    return false;
  }

  /**
    @dev Returns the last root
  */
  function getLastRoot() public view returns(bytes32) {
    return roots[currentRootIndex];
  }
}

// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol

pragma solidity ^0.5.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 */
contract ReentrancyGuard {
    // counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor () internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call");
    }
}

// File: contracts/Tornado.sol

// https://tornado.cash
/*
* d888888P                                           dP              a88888b.                   dP
*    88                                              88             d8'   `88                   88
*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.
*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88
*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88
*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP
* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
*/

pragma solidity ^0.5.8;



contract IVerifier {
  function verifyProof(bytes memory _proof, uint256[6] memory _input) public returns(bool);
}

contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
  uint256 public denomination;
  mapping(bytes32 => bool) public nullifierHashes;
  // we store all commitments just to prevent accidental deposits with the same commitment
  mapping(bytes32 => bool) public commitments;
  IVerifier public verifier;

  // operator can update snark verification key
  // after the final trusted setup ceremony operator rights are supposed to be transferred to zero address
  address public operator;
  modifier onlyOperator {
    require(msg.sender == operator, "Only operator can call this function.");
    _;
  }

  event Deposit(bytes32 indexed commitment, uint32 leafIndex, uint256 timestamp);
  event Withdrawal(address to, bytes32 nullifierHash, address indexed relayer, uint256 fee);

  /**
    @dev The constructor
    @param _verifier the address of SNARK verifier for this contract
    @param _denomination transfer amount for each deposit
    @param _merkleTreeHeight the height of deposits' Merkle Tree
    @param _operator operator address (see operator comment above)
  */
  constructor(
    IVerifier _verifier,
    uint256 _denomination,
    uint32 _merkleTreeHeight,
    address _operator
  ) MerkleTreeWithHistory(_merkleTreeHeight) public {
    require(_denomination > 0, "denomination should be greater than 0");
    verifier = _verifier;
    operator = _operator;
    denomination = _denomination;
  }

  /**
    @dev Deposit funds into the contract. The caller must send (for ETH) or approve (for ERC20) value equal to or `denomination` of this instance.
    @param _commitment the note commitment, which is PedersenHash(nullifier + secret)
  */
  function deposit(bytes32 _commitment) external payable nonReentrant {
    require(!commitments[_commitment], "The commitment has been submitted");

    uint32 insertedIndex = _insert(_commitment);
    commitments[_commitment] = true;
    _processDeposit();

    emit Deposit(_commitment, insertedIndex, block.timestamp);
  }

  /** @dev this function is defined in a child contract */
  function _processDeposit() internal;

  /**
    @dev 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)
  */
  function withdraw(bytes calldata _proof, bytes32 _root, bytes32 _nullifierHash, address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) external payable nonReentrant {
    require(_fee <= denomination, "Fee exceeds transfer value");
    require(!nullifierHashes[_nullifierHash], "The note has been already spent");
    require(isKnownRoot(_root), "Cannot find your merkle root"); // Make sure to use a recent one
    require(verifier.verifyProof(_proof, [uint256(_root), uint256(_nullifierHash), uint256(_recipient), uint256(_relayer), _fee, _refund]), "Invalid withdraw proof");

    nullifierHashes[_nullifierHash] = true;
    _processWithdraw(_recipient, _relayer, _fee, _refund);
    emit Withdrawal(_recipient, _nullifierHash, _relayer, _fee);
  }

  /** @dev this function is defined in a child contract */
  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal;

  /** @dev whether a note is already spent */
  function isSpent(bytes32 _nullifierHash) public view returns(bool) {
    return nullifierHashes[_nullifierHash];
  }

  /** @dev whether an array of notes is already spent */
  function isSpentArray(bytes32[] calldata _nullifierHashes) external view returns(bool[] memory spent) {
    spent = new bool[](_nullifierHashes.length);
    for(uint i = 0; i < _nullifierHashes.length; i++) {
      if (isSpent(_nullifierHashes[i])) {
        spent[i] = true;
      }
    }
  }

  /**
    @dev 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
  */
  function updateVerifier(address _newVerifier) external onlyOperator {
    verifier = IVerifier(_newVerifier);
  }

  /** @dev operator can change his address */
  function changeOperator(address _newOperator) external onlyOperator {
    operator = _newOperator;
  }
}

// File: contracts/ERC20Tornado.sol

// https://tornado.cash
/*
* d888888P                                           dP              a88888b.                   dP
*    88                                              88             d8'   `88                   88
*    88    .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b.    88        .d8888b. .d8888b. 88d888b.
*    88    88'  `88 88'  `88 88'  `88 88'  `88 88'  `88 88'  `88    88        88'  `88 Y8ooooo. 88'  `88
*    88    88.  .88 88       88    88 88.  .88 88.  .88 88.  .88 dP Y8.   .88 88.  .88       88 88    88
*    dP    `88888P' dP       dP    dP `88888P8 `88888P8 `88888P' 88  Y88888P' `88888P8 `88888P' dP    dP
* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
*/

pragma solidity ^0.5.8;


contract TornadoCash_erc20 is Tornado {
  address public token;

  constructor(
    IVerifier _verifier,
    uint256 _denomination,
    uint32 _merkleTreeHeight,
    address _operator,
    address _token
  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {
    token = _token;
  }

  function _processDeposit() internal {
    require(msg.value == 0, "ETH value is supposed to be 0 for ERC20 instance");
    _safeErc20TransferFrom(msg.sender, address(this), denomination);
  }

  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal {
    require(msg.value == _refund, "Incorrect refund amount received by the contract");

    _safeErc20Transfer(_recipient, denomination - _fee);
    if (_fee > 0) {
      _safeErc20Transfer(_relayer, _fee);
    }

    if (_refund > 0) {
      (bool success, ) = _recipient.call.value(_refund)("");
      if (!success) {
        // let's return _refund back to the relayer
        _relayer.transfer(_refund);
      }
    }
  }

  function _safeErc20TransferFrom(address _from, address _to, uint256 _amount) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd /* transferFrom */, _from, _to, _amount));
    require(success, "not enough allowed tokens");

    // if contract returns some data lets make sure that is `true` according to standard
    if (data.length > 0) {
      require(data.length == 32, "data length should be either 0 or 32 bytes");
      success = abi.decode(data, (bool));
      require(success, "not enough allowed tokens. Token returns false.");
    }
  }

  function _safeErc20Transfer(address _to, uint256 _amount) internal {
    (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb /* transfer */, _to, _amount));
    require(success, "not enough tokens");

    // if contract returns some data lets make sure that is `true` according to standard
    if (data.length > 0) {
      require(data.length == 32, "data length should be either 0 or 32 bytes");
      success = abi.decode(data, (bool));
      require(success, "not enough tokens. Token returns false.");
    }
  }
}

Contract Security Audit

Contract ABI

[{"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":"nullifierHashes","outputs":[{"internalType":"bool","name":"","type":"bool"}],"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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Libraries Used


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Swarm Source

bzzr://eedd377dd479e33096b8ae40ac1f5cf72ccf7e7f36628dcbb747b78530751d0c
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.