ETH Price: $2,660.60 (-0.05%)

Contract

0x4C0470Ec220E80BFb00774b7ee2c288D6dB8Ab98
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

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Transaction Hash
Method
Block
From
To
Withdraw159357912022-11-09 23:38:23823 days ago1668037103IN
0x4C0470Ec...D6dB8Ab98
0 ETH0.0223466271.37422937
Deposit159357762022-11-09 23:35:11823 days ago1668036911IN
0x4C0470Ec...D6dB8Ab98
10 ETH0.0668790971.3026381

Latest 1 internal transaction

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159357912022-11-09 23:38:23823 days ago1668037103
0x4C0470Ec...D6dB8Ab98
10 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
VoidBeta

Compiler Version
v0.8.15+commit.e14f2714

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 3 : VoidBeta.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

import "./MerkleTreeWithHistory.sol";
import "openzeppelin/security/ReentrancyGuard.sol";

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

contract VoidBeta is MerkleTreeWithHistory, ReentrancyGuard {

    error DenominationTooSmall();
    error CommitmentSubmitted();
    error IncorrectValue();
    error FeeExceedsValue();
    error NoteAlreadySpent();
    error MerkleRootNotFound();
    error InvalidWithdrawProof();
    error RecipientPaymentFailed();
    error RelayerPaymentFailed();

    IVerifier public immutable verifier;
    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;

    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 _hasher the address of MiMC hash contract
        @param _denomination transfer amount for each deposit
    */
    constructor(IVerifier _verifier, IHasher _hasher, uint256 _denomination) MerkleTreeWithHistory(20, _hasher) {
        if (_denomination <= 0) { revert DenominationTooSmall(); }
        verifier = _verifier;
        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 {
        if (commitments[_commitment]) { revert CommitmentSubmitted(); }

        uint32 insertedIndex = _insert(_commitment);
        commitments[_commitment] = true;
        if (msg.value != denomination) { revert IncorrectValue(); }

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

    /**
        @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 {
        if (_fee > denomination) { revert FeeExceedsValue(); }
        if (nullifierHashes[_nullifierHash]) { revert NoteAlreadySpent(); }
        if (!isKnownRoot(_root)) { revert MerkleRootNotFound(); } // Make sure to use a recent one
        if (!verifier.verifyProof(
            _proof,
            [uint256(_root), uint256(_nullifierHash), uint256(uint160(address(_recipient))), uint256(uint160(address(_relayer))), _fee, _refund]
        )) { revert InvalidWithdrawProof(); }

        nullifierHashes[_nullifierHash] = true;

        (bool success, ) = _recipient.call{ value: denomination - _fee }("");
        if (!success) { revert RecipientPaymentFailed(); }
        if (_fee > 0) {
            (success, ) = _relayer.call{ value: _fee }("");
            if (!success) { revert RelayerPaymentFailed(); }
        }

        emit Withdrawal(_recipient, _nullifierHash, _relayer, _fee);
    }
}

File 2 of 3 : MerkleTreeWithHistory.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

interface IHasher {
  function MiMCSponge(uint256 in_xL, uint256 in_xR) external pure returns (uint256 xL, uint256 xR);
}

contract MerkleTreeWithHistory {

    error LevelTooSmall();
    error LevelTooBig();
    error LeftOutsideField();
    error RightOutsideField();
    error MerkleTreeIsFull();
    error IndexOutOfBounds();

    uint256 public constant FIELD_SIZE = 21888242871839275222246405745257275088548364400416034343698204186575808495617;
    uint256 public constant ZERO_VALUE = 21663839004416932945382355908790599225266501822907911457504978515578255421292; // = keccak256("tornado") % FIELD_SIZE
    IHasher public immutable hasher;

    uint32 public levels;

    // the following variables are made public for easier testing and debugging and
    // are not supposed to be accessed in regular code
    mapping(uint256 => bytes32) public filledSubtrees;
    mapping(uint256 => bytes32) public roots;
    uint32 public constant ROOT_HISTORY_SIZE = 30;
    uint32 public currentRootIndex = 0;
    uint32 public nextIndex = 0;

    constructor(uint32 _levels, IHasher _hasher) {
        if (_levels <= 0) { revert LevelTooSmall(); }
        if (_levels >= 32) { revert LevelTooBig(); }
        levels = _levels;
        hasher = _hasher;

        for (uint32 i = 0; i < _levels; i++) {
            filledSubtrees[i] = zeros(i);
        }

        roots[0] = zeros(_levels - 1);
    }

    /**
    @dev Hash 2 tree leaves, returns MiMC(_left, _right)
    */
    function hashLeftRight(IHasher _hasher, bytes32 _left, bytes32 _right) public pure returns (bytes32) {
        if (uint256(_left) >= FIELD_SIZE) { revert LeftOutsideField(); }
        if (uint256(_right) >= FIELD_SIZE) { revert RightOutsideField(); }
        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 _nextIndex = nextIndex;
        if (_nextIndex == uint32(2)**levels) { revert MerkleTreeIsFull(); }
        uint32 currentIndex = _nextIndex;
        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(hasher, left, right);
            currentIndex /= 2;
        }

        uint32 newRootIndex = (currentRootIndex + 1) % ROOT_HISTORY_SIZE;
        currentRootIndex = newRootIndex;
        roots[newRootIndex] = currentLevelHash;
        nextIndex = _nextIndex + 1;
        return _nextIndex;
    }

    /**
    @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];
    }

    /// @dev provides Zero (Empty) elements for a MiMC MerkleTree. Up to 32 levels
    function zeros(uint256 i) private pure returns (bytes32) {
        if (i == 0) return bytes32(0x2fe54c60d3acabf3343a35b6eba15db4821b340f76e741e2249685ed4899af6c);
        else if (i == 1) return bytes32(0x256a6135777eee2fd26f54b8b7037a25439d5235caee224154186d2b8a52e31d);
        else if (i == 2) return bytes32(0x1151949895e82ab19924de92c40a3d6f7bcb60d92b00504b8199613683f0c200);
        else if (i == 3) return bytes32(0x20121ee811489ff8d61f09fb89e313f14959a0f28bb428a20dba6b0b068b3bdb);
        else if (i == 4) return bytes32(0x0a89ca6ffa14cc462cfedb842c30ed221a50a3d6bf022a6a57dc82ab24c157c9);
        else if (i == 5) return bytes32(0x24ca05c2b5cd42e890d6be94c68d0689f4f21c9cec9c0f13fe41d566dfb54959);
        else if (i == 6) return bytes32(0x1ccb97c932565a92c60156bdba2d08f3bf1377464e025cee765679e604a7315c);
        else if (i == 7) return bytes32(0x19156fbd7d1a8bf5cba8909367de1b624534ebab4f0f79e003bccdd1b182bdb4);
        else if (i == 8) return bytes32(0x261af8c1f0912e465744641409f622d466c3920ac6e5ff37e36604cb11dfff80);
        else if (i == 9) return bytes32(0x0058459724ff6ca5a1652fcbc3e82b93895cf08e975b19beab3f54c217d1c007);
        else if (i == 10) return bytes32(0x1f04ef20dee48d39984d8eabe768a70eafa6310ad20849d4573c3c40c2ad1e30);
        else if (i == 11) return bytes32(0x1bea3dec5dab51567ce7e200a30f7ba6d4276aeaa53e2686f962a46c66d511e5);
        else if (i == 12) return bytes32(0x0ee0f941e2da4b9e31c3ca97a40d8fa9ce68d97c084177071b3cb46cd3372f0f);
        else if (i == 13) return bytes32(0x1ca9503e8935884501bbaf20be14eb4c46b89772c97b96e3b2ebf3a36a948bbd);
        else if (i == 14) return bytes32(0x133a80e30697cd55d8f7d4b0965b7be24057ba5dc3da898ee2187232446cb108);
        else if (i == 15) return bytes32(0x13e6d8fc88839ed76e182c2a779af5b2c0da9dd18c90427a644f7e148a6253b6);
        else if (i == 16) return bytes32(0x1eb16b057a477f4bc8f572ea6bee39561098f78f15bfb3699dcbb7bd8db61854);
        else if (i == 17) return bytes32(0x0da2cb16a1ceaabf1c16b838f7a9e3f2a3a3088d9e0a6debaa748114620696ea);
        else if (i == 18) return bytes32(0x24a3b3d822420b14b5d8cb6c28a574f01e98ea9e940551d2ebd75cee12649f9d);
        else if (i == 19) return bytes32(0x198622acbd783d1b0d9064105b1fc8e4d8889de95c4c519b3f635809fe6afc05);
        else if (i == 20) return bytes32(0x29d7ed391256ccc3ea596c86e933b89ff339d25ea8ddced975ae2fe30b5296d4);
        else if (i == 21) return bytes32(0x19be59f2f0413ce78c0c3703a3a5451b1d7f39629fa33abd11548a76065b2967);
        else if (i == 22) return bytes32(0x1ff3f61797e538b70e619310d33f2a063e7eb59104e112e95738da1254dc3453);
        else if (i == 23) return bytes32(0x10c16ae9959cf8358980d9dd9616e48228737310a10e2b6b731c1a548f036c48);
        else if (i == 24) return bytes32(0x0ba433a63174a90ac20992e75e3095496812b652685b5e1a2eae0b1bf4e8fcd1);
        else if (i == 25) return bytes32(0x019ddb9df2bc98d987d0dfeca9d2b643deafab8f7036562e627c3667266a044c);
        else if (i == 26) return bytes32(0x2d3c88b23175c5a5565db928414c66d1912b11acf974b2e644caaac04739ce99);
        else if (i == 27) return bytes32(0x2eab55f6ae4e66e32c5189eed5c470840863445760f5ed7e7b69b2a62600f354);
        else if (i == 28) return bytes32(0x002df37a2642621802383cf952bf4dd1f32e05433beeb1fd41031fb7eace979d);
        else if (i == 29) return bytes32(0x104aeb41435db66c3e62feccc1d6f5d98d0a0ed75d1374db457cf462e3a1f427);
        else if (i == 30) return bytes32(0x1f3c6fd858e9a7d4b0d1f38e256a09d81d5a5e3c963987e2d4b814cfab7c6ebb);
        else if (i == 31) return bytes32(0x2c7a07d20dff79d01fecedc1134284a8d08436606c93693b67e333f671bf69cc);
        else revert IndexOutOfBounds();
    }
}

File 3 of 3 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @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 making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

Settings
{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"contract IVerifier","name":"_verifier","type":"address"},{"internalType":"contract IHasher","name":"_hasher","type":"address"},{"internalType":"uint256","name":"_denomination","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"CommitmentSubmitted","type":"error"},{"inputs":[],"name":"DenominationTooSmall","type":"error"},{"inputs":[],"name":"FeeExceedsValue","type":"error"},{"inputs":[],"name":"IncorrectValue","type":"error"},{"inputs":[],"name":"IndexOutOfBounds","type":"error"},{"inputs":[],"name":"InvalidWithdrawProof","type":"error"},{"inputs":[],"name":"LeftOutsideField","type":"error"},{"inputs":[],"name":"LevelTooBig","type":"error"},{"inputs":[],"name":"LevelTooSmall","type":"error"},{"inputs":[],"name":"MerkleRootNotFound","type":"error"},{"inputs":[],"name":"MerkleTreeIsFull","type":"error"},{"inputs":[],"name":"NoteAlreadySpent","type":"error"},{"inputs":[],"name":"RecipientPaymentFailed","type":"error"},{"inputs":[],"name":"RelayerPaymentFailed","type":"error"},{"inputs":[],"name":"RightOutsideField","type":"error"},{"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"},{"inputs":[],"name":"FIELD_SIZE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ROOT_HISTORY_SIZE","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ZERO_VALUE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"commitments","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentRootIndex","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"denomination","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_commitment","type":"bytes32"}],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"filledSubtrees","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IHasher","name":"_hasher","type":"address"},{"internalType":"bytes32","name":"_left","type":"bytes32"},{"internalType":"bytes32","name":"_right","type":"bytes32"}],"name":"hashLeftRight","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[],"name":"hasher","outputs":[{"internalType":"contract IHasher","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_root","type":"bytes32"}],"name":"isKnownRoot","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"levels","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"nextIndex","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"nullifierHashes","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"roots","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"verifier","outputs":[{"internalType":"contract IVerifier","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"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":[],"stateMutability":"payable","type":"function"}]

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000ca17f506d26ee4a06104f167a1e773dc9b28d9a2000000000000000000000000b6b8824ea366547ab2c49086c9be34e6cd9c2ceb0000000000000000000000000000000000000000000000008ac7230489e80000

-----Decoded View---------------
Arg [0] : _verifier (address): 0xcA17F506d26EE4A06104f167a1e773dC9B28D9A2
Arg [1] : _hasher (address): 0xb6b8824ea366547Ab2C49086C9bE34E6CD9C2CEb
Arg [2] : _denomination (uint256): 10000000000000000000

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000ca17f506d26ee4a06104f167a1e773dc9b28d9a2
Arg [1] : 000000000000000000000000b6b8824ea366547ab2c49086c9be34e6cd9c2ceb
Arg [2] : 0000000000000000000000000000000000000000000000008ac7230489e80000


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Transaction Hash Block Value Eth2 PubKey Valid
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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.