swkim109

//SPDX-License-Identifier:MIT
pragma solidity 0.7.6;


interface ERC721 /* is ERC165 */ {
    /// @dev This emits when ownership of any NFT changes by any mechanism.
    ///  This event emits when NFTs are created (`from` == 0) and destroyed
    ///  (`to` == 0). Exception: during contract creation, any number of NFTs
    ///  may be created and assigned without emitting Transfer. At the time of
    ///  any transfer, the approved address for that NFT (if any) is reset to none.

swkim109

import hashlib

# block info
v = "20000000"
pHash = "0000000000000000001113e97e93bd818554382f16d089a81371c6873a0b92b6"
mroot = "f765e73e351ef8ed6c0f09c2b2c48b87fee449ac41582193f757f0327a1d65e3"
ts = 1558398995  # convert human readable time to timestamp in https://www.epochconverter.com/ 
bits = 388627269  
n = 3231819810

swkim109

const ethTx = require('ethereumjs-tx').Transaction;
const Web3 = require('web3');
const { GANACHE_WS, GANACHE_NETWORK_ID } = require('./eth.config');
const Common = require('ethereumjs-common').default;

let NETWORK_ID;
let PROVIDER;
if (process.env.NODE_ENV === "development") {
    //PROVIDER = GANACHE_WS;
    //NETWORK_ID = GANACHE_NETWORK_ID;

swkim109

const ethTx = require('@ethereumjs/tx').Transaction;
const Common = require('@ethereumjs/common').default;
const {bufferToHex}  = require('ethereumjs-util');
const Web3 = require('web3');
const { GANACHE_WS, GANACHE_NETWORK_ID } = require('./eth.config');

let NETWORK_ID;
let PROVIDER;
if (process.env.NODE_ENV === "development") {
    PROVIDER = GANACHE_WS;

swkim109

const Web3 = require('web3');
const HDWalletProvider = require("@truffle/hdwallet-provider");

const fs = require('fs');
const key = fs.readFileSync("private.key").toString().trim();
const privateKeys = [key];
//const mnemonic = "crash ... twice";

// 지갑을 쓰는 것과 동일
const provider = new HDWalletProvider({

swkim109

//SPDX-License-Identifier:MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract TokenRecipient {

    address owner;

    event ReceivedEther(address indexed sender, uint256 value);

swkim109

//SPDX-License-Identifier:MIT
pragma solidity ^0.8.0;

contract Greeter {

    struct Member {
        uint256 id;
        string name; 
    }      

swkim109

// 모두 동일한 해시
console.log(web3.utils.keccak256("Kate"));
console.log(web3.utils.sha3("Kate"));
console.log(web3.utils.soliditySha3("Kate"));
console.log(ethers.utils.keccak256(ethers.utils.toUtf8Bytes("Kate")));

// 솔리디티
// 0.5.0 이후부터는 sha3()가 없어짐
keccak256("Kate");

swkim109

// SPDX-License-Identifier: MIT
//pragma solidity ^0.8.0;
pragma solidity ^0.6.0;

contract MyContract {

    function f() public pure {
        int8 x = -2**7;
        assert(x == -x);
    }

swkim109

//SPDX-License-Identifier:MIT
pragma solidity ^0.8.0;

contract MyContract {

    struct Member {
         uint256 age;
         string name;
    }