const bitcoin = require('bitcoinjs-lib')

const hash = bitcoin.crypto.sha256(
    Buffer.from('correct horse battery staple')
)
const d = bigi.fromBuffer(hash)

const keyPair = new bitcoin.ECPair(d)
const address = keyPair.getAddress()


console.log(address)  //1C7zdTfnkzmr13HfA2vNm5SJYRK6nEKyq8

contract Auction {

    address public beneficiary;
    uint256 public auction_start;
    uint256 public auction_end;

    address public highest_bidder;
    uint256 public highest_bid;

    bool public ended;

    constructor(address _beneficiary, uint256 _bidding_time) public {
        beneficiary = _beneficiary;
        auction_start = block.timestamp;
        auction_end = auction_start + _bidding_time;
    }

    function bid() payable public {
        require(block.timestamp < auction_end);
        require(msg.value > highest_bid);

        if (highest_bid != 0) {
            send(highest_bidder, highest_bid);
        }

        highest_bidder = msg.sender;
        highest_bid = msg.value;
    }

    function end_auction() public {
        require(block.timestamp >= auction_end);
        ended = true;
        send(beneficiary, highest_bid);
    }

}

import Web3 from 'web3'


const web3 = new Web3(Web3.givenProvider || "ws://localhost:8546")
const contractAddress = '0x49aC4508A3B125f08d98c6D1564aE88114e4199F'
const contract = new web3.eth.Contract(contractABI, contractAddress, {})

export async function bid(amount) {
    return await contract.methods.bid().send({value: amount})
}

export async function showHighestBid() {
    return await contract.methods.highest_bid().call()
}