block-accounting/contract/contracts/MultiSigWallet.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.20;

contract MultiSigWallet {
    event Deposit (address indexed sender, uint amount, uint balance);
    event SubmitTransaction (
        address indexed owener,
        uint indexed txIndex,
        address indexed to,
        uint value,
        bytes data
    );

    event ConfirmTransaction(address indexed owner, uint indexed txIndex);
    event RevokeConfirmation(address indexed owner, uint indexed txIndex);
    event ExecuteTransaction(address indexed owner, uint indexed txIndex);

    address[] public owners;

    mapping(address => bool) public isOwner;

    uint public numConfirmationsRequired;

    struct Transaction {
        address to;
        uint value;
        bytes data;
        bool executed;
        uint numConfirmations;
    }

    mapping(uint => mapping(address => bool)) public isConfirmed;

    Transaction[] public transactions;

    modifier txExists(uint _txIndex){
        require(_txIndex < transactions.length, "tx does not exist");
        _;
    }

    modifier notConfirmed(uint _txIndex) {
        require(!isConfirmed[_txIndex][msg.sender], "tx already confirmed");
        _;
    }

    modifier notExecuted(uint _txIndex){
        require(!transactions[_txIndex].executed, "tx already confirmed");
        _;
    }

    constructor(address[] memory _owners, uint _numConfirmationsRequired){
        require(_owners.length > 0, "owners required");
        require(_numConfirmationsRequired > 0 && _numConfirmationsRequired <= owners.length,
            "invalid number of required confirmations");
        for (uint i = 0; i < _owners.length; i++) {
            address owner = _owners[i];
            require(owner != address(0), "invalid owner");
            require(!isOwner[owner], "owner not unique");
            isOwner[owner] = true;
            owners.push(owner);
        }
        numConfirmationsRequired = _numConfirmationsRequired;
    }

    receive() external payable {
        emit Deposit(msg.sender, msg.value, address(this).balance);
    }

    function submitTransaction(address _to, uint _value, bytes memory _data) public onlyOwner {
        uint txIndex = transactions.length;
        transactions.push(
            Transaction({
                to: _to,
                value: _value,
                data: _data,
                executed: false,
                numConfirmations: 0
            })
        );
        emit SubmitTransaction(msg.sender, txIndex, _to, _value, _data);
    }

    function confirmTransaction(
        uint _txIndex
    ) public onlyOwner txExists(_txIndex) notExecuted(_txIndex) notConfirmed(_txIndex) {
        Transaction storage transaction = transactions[_txIndex];
        transaction.numConfirmations +=1;
        isConfirmed[_txIndex][msg.sender] = true;
        emit ConfirmTransaction(msg.sender, _txIndex);
    }

function executeTransaction(uint _txIndex) public onlyOwner txExists(_txIndex) notExecuted(_txIndex){
    Transaction storage transaction = transactions[_txIndex];
    require(
        transaction.numConfirmations >=numConfirmationsRequired, "cannot execute tx"
    );
    transaction.executed = true;
    (bool, success, ) = transaction.to.call{value: transaction.value}(transaction.data);
    require(success, "tx failed");
    emit ExecuteTransaction(msg.sender, _txIndex);
}

    function revokeConfirmation(uint _txIndex) public onlyOwner txExists(_txIndex) notExecuted(_txIndex)  {

    }


}