Ethereum 原子交换合约

Ethereum 上可以使用 solidity 编写 hash 时间锁合约,完成原子交换,只要保证实现 资产锁定、hash 赎回、到期解锁,就可以完成在 Ethereum 网络中的原子交换,具体代码如下:

pragma solidity ^0.5.0;

import './SafeMath.sol';

contract EthToSmthSwaps {

  using SafeMath for uint;

  address public owner;
  address public ratingContractAddress;
  uint256 SafeTime = 1 hours; // atomic swap timeOut

  struct Swap {
    address payable targetWallet;
    bytes32 secret;
    bytes20 secretHash;
    uint256 createdAt;
    uint256 balance;
  }

  // ETH Owner => BTC Owner => Swap
  mapping(address => mapping(address => Swap)) public swaps;
  mapping(address => mapping(address => uint)) public participantSigns;

  constructor () public {
    owner = msg.sender;
  }

  event CreateSwap(address _buyer, address _seller, uint256 _value, bytes20 _secretHash, uint256 createdAt);

  // ETH Owner creates Swap with secretHash
  // ETH Owner make token deposit
  function createSwap(bytes20 _secretHash, address payable _participantAddress) public payable {
    require(msg.value > 0);
    require(swaps[msg.sender][_participantAddress].balance == uint256(0));

    swaps[msg.sender][_participantAddress] = Swap(
      _participantAddress,
      bytes32(0),
      _secretHash,
      now,
      msg.value
    );

    emit CreateSwap(_participantAddress, msg.sender, msg.value, _secretHash, now);
  }

  // ETH Owner creates Swap with secretHash
  // ETH Owner make token deposit
  function createSwapTarget(bytes20 _secretHash, address payable _participantAddress, address payable _targetWallet) public payable {
    require(msg.value > 0);
    require(swaps[msg.sender][_participantAddress].balance == uint256(0));

    swaps[msg.sender][_participantAddress] = Swap(
      _targetWallet,
      bytes32(0),
      _secretHash,
      now,
      msg.value
    );

    emit CreateSwap(_participantAddress, msg.sender, msg.value, _secretHash, now);
  }

  function getBalance(address _ownerAddress) public view returns (uint256) {
    return swaps[_ownerAddress][msg.sender].balance;
  }

  // Get target wallet (buyer check)
  function getTargetWallet(address _ownerAddress) public view returns (address) {
      return swaps[_ownerAddress][msg.sender].targetWallet;
  }

  event Withdraw(address _buyer, address _seller, bytes20 _secretHash, uint256 withdrawnAt);

  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdraw(bytes32 _secret, address _ownerAddress) public {
    Swap memory swap = swaps[_ownerAddress][msg.sender];

    require(swap.secretHash == ripemd160(abi.encodePacked(_secret)));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[_ownerAddress][msg.sender].balance = 0;
    swaps[_ownerAddress][msg.sender].secret = _secret;

    emit Withdraw(msg.sender, _ownerAddress, swap.secretHash, now);
  }
  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdrawNoMoney(bytes32 _secret, address participantAddress) public {
    Swap memory swap = swaps[msg.sender][participantAddress];

    require(swap.secretHash == ripemd160(abi.encodePacked(_secret)));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[msg.sender][participantAddress].balance = 0;
    swaps[msg.sender][participantAddress].secret = _secret;

    emit Withdraw(participantAddress, msg.sender, swap.secretHash, now);
  }
  // BTC Owner withdraw money and adds secret key to swap
  // BTC Owner receive +1 reputation
  function withdrawOther(bytes32 _secret, address _ownerAddress, address participantAddress) public {
    Swap memory swap = swaps[_ownerAddress][participantAddress];

    require(swap.secretHash == ripemd160(abi.encodePacked(_secret)));
    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) > now);

    swap.targetWallet.transfer(swap.balance);

    swaps[_ownerAddress][participantAddress].balance = 0;
    swaps[_ownerAddress][participantAddress].secret = _secret;

    emit Withdraw(participantAddress, _ownerAddress, swap.secretHash, now);
  }

  // ETH Owner receive secret
  function getSecret(address _participantAddress) public view returns (bytes32) {
    return swaps[msg.sender][_participantAddress].secret;
  }

  event Close(address _buyer, address _seller);



  event Refund(address _buyer, address _seller, bytes20 _secretHash);

  // ETH Owner refund money
  // BTC Owner gets -1 reputation
  function refund(address _participantAddress) public {
    Swap memory swap = swaps[msg.sender][_participantAddress];

    require(swap.balance > uint256(0));
    require(swap.createdAt.add(SafeTime) < now);

    msg.sender.transfer(swap.balance);

    clean(msg.sender, _participantAddress);

    emit Refund(_participantAddress, msg.sender, swap.secretHash);
  }

  function clean(address _ownerAddress, address _participantAddress) internal {
    delete swaps[_ownerAddress][_participantAddress];
    delete participantSigns[_ownerAddress][_participantAddress];
  }
}

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