How Do You Implement a Multisig Wallet in Solidity?

**Problem Faced:
**Single-owner wallets are prone to security risks, such as hacks or losing a private key.

Solution:
A multisig wallet (multi-signature) requires multiple owners to approve transactions before execution.

solidity

pragma solidity ^0.8.0;

contract MultiSigWallet {
    address[] public owners;
    uint public required;

    struct Transaction {
        address to;
        uint value;
        bool executed;
        uint approvalCount;
    }

    mapping(uint => mapping(address => bool)) public approvals;
    Transaction[] public transactions;

    constructor(address[] memory _owners, uint _required) {
        owners = _owners;
        required = _required;
    }

    function submitTransaction(address _to, uint _value) external {
        transactions.push(Transaction({ to: _to, value: _value, executed: false, approvalCount: 0 }));
    }

    function approveTransaction(uint _txIndex) external {
        Transaction storage txn = transactions[_txIndex];
        require(!approvals[_txIndex][msg.sender], "Already approved");
        approvals[_txIndex][msg.sender] = true;
        txn.approvalCount++;

        if (txn.approvalCount >= required) {
            txn.executed = true;
            payable(txn.to).transfer(txn.value);
        }
    }
}

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