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Contract

0x2bF76E039323A63E66Ff30b4c9B3eC6fd511EeA8
 

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x7d512690...08Bb0eac5
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Multisig

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.17;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

contract Multisig is Ownable {

  /**
   * @notice The type used to track withdrawal requests.
   */
  struct Withdrawal {
    uint256 amount;
    uint256 fee; // in wei (ETH)
    
    // 2 of the 4 potential signers is enough
    address signer1;
    address signer2;
  }

  /**
   * @notice The well-known public crypto contract.  Cannot change.
   */
  IERC20Metadata public crypto;

  /**
   * @notice Upstream wallet that is used to create Withdrawal objects and to move
   *         Eth to back signer wallets so they can keep signing transactions.
   */
  address public upstreamWallet;

  // The full set of all signers, only 2 are needed to complete a withdrawal.
  address public signer1;
  address public signer2;
  address public signer3;
  address public signer4;

  function decimals() external view returns (uint256) {
    return crypto.decimals();
  }

  /**
   * The current limit for each approval account.  For larger withdrawals
   * the limits will be temporarily increased before being reduced back to
   * a smaller/safer limit.  This process requires back office coordination.
   */
  mapping (address => uint256) public limits;

  /**
   * @notice The collection of all pending withdrawals, only one can be active
   *         per wallet at a time.
   */
  mapping (address => Withdrawal) public withdrawals;

  modifier onlyUpstream {
    require(_msgSender() == upstreamWallet, "You are not Upstream.");
    _;
  }

  // The three events to cover the lifecycle of a withdrawal.  Approved happens for
  // each approver, in this contract that will be at least twice.
  event WithdrawalCreated(address indexed who, uint256 quantity, uint256 fee);
  event WithdrawalApproved(address indexed who, address indexed approver, uint256 fee);
  event WithdrawalComplete(address indexed who, uint256 quantity, uint256 fee);
  event WithdrawalCancelled(address indexed who);

  /**
   * @notice Create an instance of this contract.
   *
   * @param cryptoAddress The address of the well-known Crypto Currency contract, cannot be changed after contract creation.
   * @param upstream Initial Upstream wallet used to initiate the withdrawal.
   * @param addr1 The first address that can approve a withdrawal.
   * @param addr2 The second address that can approve a withdrawal.
   * @param addr3 The third address that can approve a withdrawal.
   * @param addr4 The fourth address that can approve a withdrawal.
   * @param limit The approval limit of each signer, in wei.  e.g. 10 USDC (6 digits precision) = 10000000.
   */
  constructor(address cryptoAddress, address upstream, address addr1, address addr2, address addr3, address addr4, uint256 limit) {
    require(cryptoAddress != address(0), "Crypto contract cannot be null");
    require(upstream != address(0), "Upstream address cannot be null");
    require(addr1 != address(0), "Signer 1 cannot be null");
    require(addr2 != address(0), "Signer 2 cannot be null");
    require(addr3 != address(0), "Signer 3 cannot be null");
    require(addr4 != address(0), "Signer 4 cannot be null");
    require(limit != 0, "Approve limit cannot be zero");

    crypto = IERC20Metadata(cryptoAddress);
    upstreamWallet = upstream;

    signer1 = addr1;
    limits[signer1] = limit;

    signer2 = addr2;
    limits[signer2] = limit;
    
    signer3 = addr3;
    limits[signer3] = limit;

    signer4 = addr4;
    limits[signer4] = limit;
  }

  /**
   * @param addr The new address to give the Upstream wallet.
   */
  function setUpstreamWallet(address addr) external onlyOwner
  {
    require(addr != address(0), "Upstream address cannot be null");

    upstreamWallet = addr;
  }

  /**
   * @param addr The new address to give the first approval wallet.
   * @param limit The approval limit for this account.
   *
   * @dev No need to protect against duplicate addresses, the logic of the other functions
   *      prevents a single wallet fully approving a withdrawal.
   */
  function setSigner1(address addr, uint256 limit) external onlyOwner
  {
    require(addr != address(0), "Signer 1 cannot be null");
    signer1 = addr;
    limits[signer1] = limit;
  }

  /**
   * @param addr The new address to give the second approval wallet.
   * @param limit The approval limit for this account.
   */
  function setSigner2(address addr, uint256 limit) external onlyOwner
  {
    require(addr != address(0), "Signer 2 cannot be null");
    signer2 = addr;
    limits[signer2] = limit;
  }

  /**
   * @param addr The new address to give the third approval wallet.
   * @param limit The approval limit for this account.
   */
  function setSigner3(address addr, uint256 limit) external onlyOwner
  {
    require(addr != address(0), "Signer 3 cannot be null");
    signer3 = addr;
    limits[signer3] = limit;
  }

  /**
   * @param addr The new address to give the fourth approval wallet.
   * @param limit The approval limit for this account.
   */
  function setSigner4(address addr, uint256 limit) external onlyOwner
  {
    require(addr != address(0), "Signer 4 cannot be null");
    signer4 = addr;
    limits[signer4] = limit;
  }

  /**
   * @notice Get the withdrawal amount pending for the caller.
   */
  function getAmount() external view returns (uint256) {
    return getAmountFor(_msgSender());
  }

  /**
   * @notice Get the withdrawal amount pending for the specified address.
   */
  function getAmountFor(address payee) public view returns (uint256) {
    require(withdrawals[payee].amount != 0, "No withdrawal pending.");
    Withdrawal memory withdrawal = withdrawals[payee];
    return withdrawal.amount;
  }

  /**
   * @notice Get the withdrawal fee pending for the caller.
   */
  function getFee() external view returns (uint256) {
    return getFeeFor(_msgSender());
  }

  /**
   * @notice Get the withdrawal fee pending for the specified address.
   */
  function getFeeFor(address payee) public view returns (uint256) {
    require(withdrawals[payee].amount != 0, "No withdrawal pending.");
    Withdrawal memory withdrawal = withdrawals[payee];
    return withdrawal.fee;
  }

  /**
   * @notice Get the number of approvals remaining before the withdrawal can complete
   *         for the current wallet.
   */
  function getRemainingConfirmations() external view returns (uint256) {
    return getRemainingConfirmationsFor(_msgSender());
  }

  /**
   * @notice Get the number of approvals remaining before the withdrawal can complete
   *         for the specified wallet.
   */
  function getRemainingConfirmationsFor(address payee) public view returns (uint256) {
    require(withdrawals[payee].amount != 0, "No withdrawal pending.");

    Withdrawal memory withdrawal = withdrawals[payee];
    if (withdrawal.signer1 == address(0)) return 2;
    if (withdrawal.signer2 == address(0)) return 1;
    return 0;
  }

  /**
   * @notice Create a new withdrawal for the payee.  One must not already exist (no overwrite
   *         and no multiple withdrawals in parallel).
   *
   * @param payee The recipient of the withdrawal.
   * @param amount The amount to withdraw, in wei.
   * @param fee The Eth transaction cost (gas Gwei * gas used) to create this withdrawal.
   */
  function createWithdrawal(address payee, uint256 amount, uint256 fee) external onlyUpstream {
    require(withdrawals[payee].amount == 0, "One payment to a payee at a time.");
    require(amount > 0, "Invalid amount.");
    require(fee > 0, "Invalid fee.");

    withdrawals[payee] = Withdrawal(amount, fee, address(0), address(0));

    emit WithdrawalCreated(payee, amount, fee);
  }  

  /**
   * @notice One of the four multisig wallets confirms that this is a valid withdrawal.
   *         Only after two separate multisig wallets confirm will user be able to complete the
   *         withdrawal process.
   *
   * @param payee The address performing the withdrawal.
   * @param fee The Eth transaction cost (gas Gwei * gas used) to confirm this withdrawal.
   */
  function confirm(address payee, uint256 fee) external {
    require(_msgSender() == signer1 || _msgSender() == signer2 ||
            _msgSender() == signer3 || _msgSender() == signer4, "Invalid approver.");
    require(withdrawals[payee].amount != 0, "No withdrawal pending.");
    Withdrawal memory withdrawal = withdrawals[payee];
    require(limits[_msgSender()] >= withdrawal.amount, "Amount above approval limit.");
    require(withdrawal.signer1 == address(0) || withdrawal.signer2 == address(0), "Withdrawal already confirmed.");
    require(fee > 0, "Invalid fee.");

    if (withdrawal.signer1 == address(0)) {
      withdrawals[payee].signer1 = _msgSender();
    } else if (withdrawal.signer1 == _msgSender()) {
      revert("Address already approved this withdrawal.");
    } else if (withdrawal.signer2 == address(0)) {
      withdrawals[payee].signer2 = _msgSender();
    }
    withdrawals[payee].fee = withdrawals[payee].fee + fee;
    
    emit WithdrawalApproved(payee, _msgSender(), fee);
  }

  /**
   * @notice The user completes the withdrawal after 2 multisigs.
   *
   * @dev Note the fee is paid directly by the caller, not subtracted from the amount to protect
   *      the user from excessive fees.
   */
  function withdraw() external payable {
    require(withdrawals[_msgSender()].amount != 0, "No withdrawal pending.");
    Withdrawal memory withdrawal = withdrawals[_msgSender()];
    require(withdrawal.signer1 != address(0) && withdrawal.signer2 != address(0), "Pending confirmation.");
    require(msg.value >= withdrawal.fee, "Insufficient fee.");
    require(crypto.balanceOf(address(this)) >= withdrawal.amount, "Insufficient balance in this contract, please try later.");

    uint256 amount = withdrawal.amount;
    withdrawals[_msgSender()] = Withdrawal(0, 0, address(0), address(0));
    if(!crypto.transfer(_msgSender(), amount))
      revert("Crypto transfer failed");

    emit WithdrawalComplete(_msgSender(), amount, withdrawal.fee);
  }

  /**
   * @notice Cancel a pending withdrawal.  Upstream back-office admin function.
   *
   * @param payee The address of the payee having the withdrawal cancelled.
   */
  function cancel(address payee) external onlyUpstream {
    require(withdrawals[payee].amount != 0, "No withdrawal pending.");

    withdrawals[payee] = Withdrawal(0, 0, address(0), address(0));

    emit WithdrawalCancelled(payee);
  }

  /**
   * @notice Transfer the paid-in Eth fees back out to signers wallets.
   *
   * @param to The address to send the Ether from this contract to.
   * @param amount The amount of Eth to transfer.
   */
  function transfer(address payable to, uint256 amount) external onlyUpstream returns (bool) { 
    require(to != address(0), "Cannot transfer to null");
    require(amount != 0, "Cannot transfer zero");

    to.transfer(amount);

    return true;
  }  
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

API
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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.