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// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./Mixshit.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

contract ETHMixshit is Mixshit, Ownable {
  uint256 public fee = 0;
  uint256 public feeDecimal = 10000;
  address public feeReceiveAddress;

  constructor(
    IVerifier _verifier,
    IHasher _hasher,
    uint256 _denomination,
    uint256 _fee,
    uint256 _feeDecimal,
    uint32 _merkleTreeHeight
  ) Mixshit(_verifier, _hasher, _denomination, _merkleTreeHeight) {
    feeReceiveAddress = msg.sender;
    fee = _fee;
    feeDecimal = _feeDecimal;
  }

  /** @dev update fee */
  function updateFee(uint256 _fee, uint256 _feeDecimal) external onlyOwner {
    fee = _fee;
    feeDecimal = _feeDecimal;
  }

  /** @dev update fee receive address */
  function updateFeeAddress(address _feeReceiveAddress) external onlyOwner {
    feeReceiveAddress = _feeReceiveAddress;
  }

  function _processDeposit() internal override {
    require(msg.value == denomination, "Please send `mixDenomination` ETH along with transaction");
  }

  function _processWithdraw(
    address payable _recipient,
    address payable _relayer,
    uint256 _fee,
    uint256 _refund
  ) internal override {
    // sanity checks
    require(msg.value == 0, "Message value is supposed to be zero for ETH instance");
    require(_refund == 0, "Refund value is supposed to be zero for ETH instance");

    uint256 _newFee = (denomination * fee) / feeDecimal;

    require(_newFee < denomination, "fee is supposed to be less than denomination");
    
    (bool success, ) = _recipient.call{ value: denomination - _newFee }("");
    require(success, "payment to _recipient did not go thru");
    if (_newFee > 0) {
      (success, ) = feeReceiveAddress.call{ value: _newFee }("");
      require(success, "payment to _relayer did not go thru");
    }
  }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        _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 make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // 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;

        _;

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

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

import "./MerkleTreeWithHistory.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

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

abstract contract Mixshit is MerkleTreeWithHistory, ReentrancyGuard {
  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
    @param _merkleTreeHeight the height of deposits' Merkle Tree
  */
  constructor(
    IVerifier _verifier,
    IHasher _hasher,
    uint256 _denomination,
    uint32 _merkleTreeHeight
  ) MerkleTreeWithHistory(_merkleTreeHeight, _hasher) {
    require(_denomination > 0, "denomination should be greater than 0");
    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 {
    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 virtual;

  /**
    @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 virtual;

  /** @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 (uint256 i = 0; i < _nullifierHashes.length; i++) {
      if (isSpent(_nullifierHashes[i])) {
        spent[i] = true;
      }
    }
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

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

contract MerkleTreeWithHistory {
  uint256 public constant FIELD_SIZE = 21888242871839275222246405745257275088548364400416034343698204186575808495617;
  uint256 public constant ZERO_VALUE = 21663839004416932945382355908790599225266501822907911457504978515578255421292;
  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

  // filledSubtrees and roots could be bytes32[size], but using mappings makes it cheaper because
  // it removes index range check on every interaction
  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) {
    require(_levels > 0, "_levels should be greater than zero");
    require(_levels < 32, "_levels should be less than 32");
    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) {
    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 _nextIndex = nextIndex;
    require(_nextIndex != uint32(2)**levels, "Merkle tree is full. No more leaves can be added");
    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 _currentRootIndex = currentRootIndex;
    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) public 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("Index out of bounds");
  }
}

{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"inputs":[{"internalType":"contract IVerifier","name":"_verifier","type":"address"},{"internalType":"contract IHasher","name":"_hasher","type":"address"},{"internalType":"uint256","name":"_denomination","type":"uint256"},{"internalType":"uint256","name":"_fee","type":"uint256"},{"internalType":"uint256","name":"_feeDecimal","type":"uint256"},{"internalType":"uint32","name":"_merkleTreeHeight","type":"uint32"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"commitment","type":"bytes32"},{"indexed":false,"internalType":"uint32","name":"leafIndex","type":"uint32"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","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":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeDecimal","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeReceiveAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","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 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000000000000000000000000fc172a63c66b0474e64bb6a2a7b66eb071b229490000000000000000000000005fd50db4675d107ca40145f4620df4552dfd601a000000000000000000000000000000000000000000000000016345785d8a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000027100000000000000000000000000000000000000000000000000000000000000014

-----Decoded View---------------
Arg [0] : _verifier (address): 0xfc172a63C66B0474E64bB6A2A7b66EB071B22949
Arg [1] : _hasher (address): 0x5fD50dB4675D107cA40145F4620dF4552DFd601a
Arg [2] : _denomination (uint256): 100000000000000000
Arg [3] : _fee (uint256): 0
Arg [4] : _feeDecimal (uint256): 10000
Arg [5] : _merkleTreeHeight (uint32): 20

-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 000000000000000000000000fc172a63c66b0474e64bb6a2a7b66eb071b22949
Arg [1] : 0000000000000000000000005fd50db4675d107ca40145f4620df4552dfd601a
Arg [2] : 000000000000000000000000000000000000000000000000016345785d8a0000
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000014