Decentralized
Settlement Layer

contract AtomicEscrow {
    struct Transaction {
        address payable sender;
        address payable receiver;
        uint256 amount;
        bytes32 hashLock; // Cryptographic Proof
        uint256 timelock; // Expiration Time
    }

    // 1. Sender locks funds with a secret hash
    function lockFunds(bytes32 _hashLock, uint256 _timelock, address payable _receiver) external payable {
        require(msg.value > 0, "No funds sent");
        transactions[txId] = Transaction(msg.sender, _receiver, msg.value, _hashLock, _timelock);
    }

    // 2. Receiver unlocks funds by revealing the secret (Pre-image)
    function withdraw(bytes32 _preimage) external {
        require(sha256(abi.encodePacked(_preimage)) == txn.hashLock, "Invalid proof");
        txn.receiver.transfer(txn.amount);
    }