main.js

// Packages
const fs = require('fs')
const chalk = require('chalk')
const date = require('date-and-time');
var rn = require('random-number');
const secureRandom = require('secure-random');

// Files
const CryptoBlockChain = require('./Models/CryptoBlockChain');
const CryptoBlock = require('./Models/CryptoBlock');

// Declarations
const now = new Date();
var gen = rn.generator({
    min: -1000
    , max: 1000
    , integer: true
})
const max = Buffer.from("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140", 'hex');
let isInvalid = true;
let privateKey;
while (isInvalid) {
    privateKey = secureRandom.randomBuffer(32);
    if (Buffer.compare(max, privateKey) === 1) {
        isInvalid = false;
    }
}
const sha256 = require('js-sha256');
const ripemd160 = require('ripemd160');
let hash = sha256(Buffer.from(msg, 'hex'));
let publicKeyHash = new ripemd160().update(Buffer.from(hash, 'hex')).digest();

function createPublicAddress(publicKeyHash) {
    // step 1 - add prefix "00" in hex
    const step1 = Buffer.from("00" + publicKeyHash, 'hex');
    // step 2 - create SHA256 hash of step 1
    const step2 = sha256(step1);
    // step 3 - create SHA256 hash of step 2
    const step3 = sha256(Buffer.from(step2, 'hex'));
    // step 4 - find the 1st byte of step 3 - save as "checksum"
    const checksum = step3.substring(0, 8);
    // step 5 - add step 1 + checksum
    const step4 = step1.toString('hex') + checksum;
    // return base 58 encoding of step 5
    const address = base58.encode(Buffer.from(step4, 'hex'));
    return address;
}
function createPrivateKeyWIF(privateKey) {
    const step1 = Buffer.from("80" + privateKey, 'hex');
    const step2 = sha256(step1);
    const step3 = sha256(Buffer.from(step2, 'hex'));
    const checksum = step3.substring(0, 8);
    const step4 = step1.toString('hex') + checksum;
    const privateKeyWIF = base58.encode(Buffer.from(step4, 'hex'));
    return privateKeyWIF;
}

console.log('> Private key: ', privateKey.toString('hex'));
let smashingCoin = new CryptoBlockChain();
smashingCoin.addNewBlock(new CryptoBlock(gen(500), date.format(now, 'YYYY/MM/DD HH:mm:ss'), { senderId: 1, recipientId: 2, quantity: 50000 }))

console.log(JSON.stringify(smashingCoin, null, 4));