EtDu

pragma solidity ^0.5.0;
contract Cheque {
    mapping (uint => bool) usedNonces;
    address owner;
    constructor() public payable {
        owner = msg.sender;
    }
}

EtDu

function claimPayment(uint amount, uint nonce, bytes memory sig) public {
    require(!usedNonces[nonce], "Nonce has already been used");
    usedNonces[nonce] = true; 

    bytes32 message = prefixed(keccak256(abi.encodePacked(msg.sender, amount, nonce, this)));

    require(recoverSigner(message, sig) == owner, "Signer is not owner");

    msg.sender.transfer(amount);
}

EtDu

pragma solidity ^0.5.0;

contract Cheque {
    mapping (uint => bool) usedNonces;
    address owner;

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

EtDu

pragma solidity ^0.5.0;

contract Cheque {
    mapping (uint => bool) usedNonces;
    address owner;

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

EtDu

pragma solidity ^0.5.0;

contract Cheque {
    mapping (uint => bool) usedNonces;
    address owner;

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

EtDu

const Web3 = require('web3')
const web3 = new Web3('ws://localhost:8545')
const fs = require('fs');

const rawCheque = fs.readFileSync('./build/contracts/Cheque.json')
const parsedCheque = JSON.parse(rawCheque)
const contractAddress = parsedCheque.networks['5777'].address

let signPayment = async (recipient, amount) => {
    const accounts = await web3.eth.getAccounts()

EtDu

module.exports = {
  networks: {
    development: {
     host: "127.0.0.1",   
     port: 8545,           
     network_id: "*",       
    }
  }
}

EtDu

const Cheque = artifacts.require("./Cheque.sol");

module.exports = function (deployer) {
    deployer.deploy(Cheque, { value: 1e18 });
};

EtDu

pragma solidity ^0.5.17;
import "./SafeMath.sol";
import "./provableAPI.sol";

contract LeaseGenerator is usingProvable {

    using SafeMath for uint;

    address payable landlordAddress;
    address payable tenantAddress;

EtDu

constructor () public payable {
    landlordAddress = msg.sender;
    provable_setCustomGasPrice(100000000000);
    OAR = OracleAddrResolverI(0xB7D2d92e74447535088A32AD65d459E97f692222);
}

function fetchUsdRate() internal {
    require(provable_getPrice("URL") < address(this).balance, "Not enough Ether in contract, please add more");
    bytes32 queryId = provable_query("URL", "json(https://api.pro.coinbase.com/products/ETH-USD/ticker).price");
    validIds[queryId] = true;