/**
 *Submitted for verification at Etherscan.io on 2026-01-24
*/

/*
    Ethereum Side Bridge Contract
    Locks ETH and emits events for ALL MAINNET to mint WETH
*/

pragma solidity 0.6.9;

contract BridgeEthereum {
    address public owner;
    address public pendingOwner;
    bool public paused;
    
    // Multi-sig support
    mapping(address => bool) public operators;
    uint256 public requiredOperators;
    
    // Bridge state
    mapping(bytes32 => bool) public processedTransactions;
    uint256 public totalLocked;
    uint256 public totalUnlocked;
    
    // Rate limiting (for unlocking)
    uint256 public maxUnlockPerTransaction;
    uint256 public dailyUnlockLimit;
    uint256 public dailyUnlockAmount;
    uint256 public lastUnlockResetDay;
    
    // Events
    event ETHLocked(
        address indexed user,
        uint256 amount,
        bytes32 indexed transactionHash,
        uint256 timestamp
    );
    
    event ETHUnlocked(
        address indexed user,
        uint256 amount,
        bytes32 indexed allMainnetTxHash,
        uint256 timestamp
    );
    
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event OperatorAdded(address indexed operator);
    event OperatorRemoved(address indexed operator);
    event Paused(address account);
    event Unpaused(address account);
    
    modifier onlyOwner() {
        require(msg.sender == owner, "Not owner");
        _;
    }
    
    modifier onlyOperator() {
        require(operators[msg.sender] || msg.sender == owner, "Not operator");
        _;
    }
    
    modifier whenNotPaused() {
        require(!paused, "Paused");
        _;
    }
    
    constructor(
        address _owner,
        uint256 _requiredOperators,
        uint256 _maxUnlockPerTransaction,
        uint256 _dailyUnlockLimit
    ) public {
        require(_owner != address(0), "Invalid owner");
        owner = _owner;
        requiredOperators = _requiredOperators;
        operators[_owner] = true;
        maxUnlockPerTransaction = _maxUnlockPerTransaction;
        dailyUnlockLimit = _dailyUnlockLimit;
        lastUnlockResetDay = block.timestamp / 1 days;
    }
    
    /**
     * @dev Lock ETH and emit event for ALL MAINNET bridge
     * @param _amount Amount of ETH to lock
     */
    function lockETH(uint256 _amount) external payable whenNotPaused {
        require(msg.value == _amount && _amount > 0, "Invalid amount");
        require(msg.sender != address(0), "Invalid sender");
        
        totalLocked += _amount;
        
        bytes32 txHash = keccak256(
            abi.encodePacked(
                msg.sender,
                _amount,
                block.timestamp,
                block.number
            )
        );
        
        emit ETHLocked(
            msg.sender,
            _amount,
            txHash,
            block.timestamp
        );
    }
    
    /**
     * @dev Unlock ETH based on burned WETH on ALL MAINNET
     * @param _user User address to receive ETH
     * @param _amount Amount of ETH to unlock
     * @param _allMainnetTxHash Transaction hash from ALL MAINNET bridge
     */
    function unlockETH(
        address payable _user,
        uint256 _amount,
        bytes32 _allMainnetTxHash
    ) external onlyOperator whenNotPaused {
        require(_user != address(0), "Invalid user");
        require(_amount > 0, "Invalid amount");
        require(_amount <= maxUnlockPerTransaction, "Exceeds max per transaction");
        require(!processedTransactions[_allMainnetTxHash], "Already processed");
        require(_amount <= address(this).balance, "Insufficient bridge balance");
        
        // Reset daily limit if new day
        uint256 currentDay = block.timestamp / 1 days;
        if (currentDay > lastUnlockResetDay) {
            dailyUnlockAmount = 0;
            lastUnlockResetDay = currentDay;
        }
        
        require(dailyUnlockAmount + _amount <= dailyUnlockLimit, "Exceeds daily limit");
        
        // Mark as processed
        processedTransactions[_allMainnetTxHash] = true;
        dailyUnlockAmount += _amount;
        totalUnlocked += _amount;
        totalLocked -= _amount;
        
        // Unlock ETH
        _user.transfer(_amount);
        
        emit ETHUnlocked(
            _user,
            _amount,
            _allMainnetTxHash,
            block.timestamp
        );
    }
    
    /**
     * @dev Owner can withdraw locked ETH (for emergency)
     */
    function withdrawETH(address payable _to, uint256 _amount) external onlyOwner {
        require(_to != address(0), "Invalid address");
        require(_amount > 0 && _amount <= address(this).balance, "Invalid amount");
        
        _to.transfer(_amount);
        totalLocked -= _amount;
    }
    
    /**
     * @dev Update unlock limits
     */
    function setUnlockLimits(uint256 _maxPerTx, uint256 _dailyLimit) external onlyOwner {
        maxUnlockPerTransaction = _maxPerTx;
        dailyUnlockLimit = _dailyLimit;
    }
    
    /**
     * @dev Get daily unlock stats
     */
    function getDailyUnlockStats() external view returns (uint256 unlocked, uint256 limit, uint256 remaining) {
        uint256 currentDay = block.timestamp / 1 days;
        if (currentDay > lastUnlockResetDay) {
            return (0, dailyUnlockLimit, dailyUnlockLimit);
        }
        return (dailyUnlockAmount, dailyUnlockLimit, dailyUnlockLimit - dailyUnlockAmount);
    }
    
    /**
     * @dev Mark transaction as processed (prevents replay)
     */
    function markProcessed(bytes32 _txHash) external onlyOperator {
        processedTransactions[_txHash] = true;
    }
    
    /**
     * @dev Add operator (for multi-sig)
     */
    function addOperator(address _operator) external onlyOwner {
        require(_operator != address(0), "Invalid operator");
        operators[_operator] = true;
        emit OperatorAdded(_operator);
    }
    
    /**
     * @dev Remove operator
     */
    function removeOperator(address _operator) external onlyOwner {
        require(_operator != address(0), "Invalid operator");
        operators[_operator] = false;
        emit OperatorRemoved(_operator);
    }
    
    /**
     * @dev Pause bridge
     */
    function pause() external onlyOwner {
        paused = true;
        emit Paused(msg.sender);
    }
    
    /**
     * @dev Unpause bridge
     */
    function unpause() external onlyOwner {
        paused = false;
        emit Unpaused(msg.sender);
    }
    
    /**
     * @dev Transfer ownership
     */
    function transferOwnership(address _newOwner) external onlyOwner {
        require(_newOwner != address(0), "Invalid owner");
        pendingOwner = _newOwner;
    }
    
    /**
     * @dev Accept ownership
     */
    function acceptOwnership() external {
        require(msg.sender == pendingOwner, "Not pending owner");
        address oldOwner = owner;
        owner = pendingOwner;
        pendingOwner = address(0);
        emit OwnershipTransferred(oldOwner, owner);
    }
    
    /**
     * @dev Get contract balance
     */
    function getBalance() external view returns (uint256) {
        return address(this).balance;
    }
    
    receive() external payable {
        // Allow direct ETH deposits
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ernalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnlocked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_user","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bytes32","name":"_allMainnetTxHash","type":"bytes32"}],"name":"unlockETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"withdrawETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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