نحوه توسعه قراردادهای هوشمند چند امضایی با سالیدیتی

// SPDX-License-Identifier: MIT
pragma solidity ^.8.;

contract MultiSigWallet {
    uint256 public requiredSignatures;
    address[] public owners;
    mapping(address => bool) public isOwner;
    
    struct Transaction {
        address to;
        uint256 value;
        bool executed;
        uint256 confirmations;
        mapping(address => bool) isConfirmed;
    }

    Transaction[] public transactions;

    event Deposit(address indexed sender, uint256 amount);
    event SubmitTransaction(address indexed owner, uint indexed txIndex);
    event ConfirmTransaction(address indexed owner, uint indexed txIndex);
    event ExecuteTransaction(address indexed owner, uint indexed txIndex);

    constructor(address[] memory _owners, uint256 _requiredSignatures) {
        require(_owners.length > , "Owners required");
        require(_requiredSignatures <= _owners.length && _requiredSignatures > , "Invalid number of required signatures");

        for (uint256 i = ; i < _owners.length; i++) {
            address owner = _owners[i];
            require(owner != address(), "Invalid owner");
            require(!isOwner[owner], "Owner not unique");

            isOwner[owner] = true;
            owners.push(owner);
        }
        requiredSignatures = _requiredSignatures;
    }

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

    function submitTransaction(address _to, uint256 _value) public {
        require(isOwner[msg.sender], "Only owners can submit transactions");

        uint txIndex = transactions.length;
        transactions.push();
        Transaction storage newTransaction = transactions[txIndex];
        newTransaction.to = _to;
        newTransaction.value = _value;
        newTransaction.executed = false;
        newTransaction.confirmations = ;

        emit SubmitTransaction(msg.sender, txIndex);
    }

    function confirmTransaction(uint256 _txIndex) public {
        require(isOwner[msg.sender], "Only owners can confirm transactions");
        Transaction storage transaction = transactions[_txIndex];
        require(!transaction.isConfirmed[msg.sender], "Transaction already confirmed");
        transaction.isConfirmed[msg.sender] = true;
        transaction.confirmations++;

        emit ConfirmTransaction(msg.sender, _txIndex);
    }

    function executeTransaction(uint256 _txIndex) public {
        Transaction storage transaction = transactions[_txIndex];
        require(transaction.confirmations >= requiredSignatures, "Not enough confirmations");
        require(!transaction.executed, "Transaction already executed");

        transaction.executed = true;
        (bool success, ) = transaction.to.call{value: transaction.value}("");
        require(success, "Transaction failed");

        emit ExecuteTransaction(msg.sender, _txIndex);
    }
}