tgoldenberg

import math


def mergesort(arr, helper=None, low=0, high=None):
    print(arr, helper, low, high)
    if high == None:
        print("Setting high...")
        high = len(arr) - 1
    if helper is None:
        print("Setting helper...")

tgoldenberg

import math

def search(l, term, offset=0):
    # find the middle
    # find length of list and divide by two
    list_len = len(l)
    if list_len <= 0:
        return None
    middle = math.floor(list_len / 2)

tgoldenberg

/**
 * Proof of concept for a KYC-enabled digital currency
 * In short, a user submits their information to a KYC provider (Oracle) along with proof of identity (similar to Jumio, etc.)
 * KYC provider provides signature for the user's identity.
 * 
 * The user can then share pieces of the identity with the relevant 
 * signature for transactions. This logic can even be part of the transaction validation logic of the digital currency.
 * What follows is just a simple example that can be run via NodeJS.
*/

tgoldenberg

Transaction (Tx)

Name	Description
vin	list of inputs
vout	list of outputs

Input

Name	Description

tgoldenberg

const RIPEMD160 = require('ripemd160');
const EC = require('elliptic').ec;
const sha256 = require('js-sha256');

const ec = new EC('secp256k1'); // Bitcoin uses Elliptic Curve Digital Signing Algorithm (ECDSA) to verify transactions

let message = 'I want to send this money'; // This would normally be the transaction hash with amount of money, publicScriptKey
let publicKey = '040c1fbe8b870d636823963ff21ba6e5250571848714203a08ae8700e0d97a1d7bb94ae888af72ac9a4fe02d558599d27c8986398902fa9ac0c1654f5839db1af5';
let privateKey = '2ec6d2808dc7b9d11e49516cfc747435feae8e9872d63c92bc5bde68a894199f';

tgoldenberg

const secureRandom = require('secure-random');
const ec = require('elliptic').ec;

const ecdsa = new ec('secp256k1');

function generateAddress() {
  const max = Buffer.from("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140", 'hex');
  let isInvalid = true;
  let privateKey;
  while (isInvalid) {

tgoldenberg

const net = require('net');
const network = require('network');
const uuid = require('uuid');
const SHA256 = require('js-sha256');

const port = parseInt(process.env.PORT);

function handleConnection(conn) {
  console.log('> New client connection: ', conn.remoteAddress, conn.remotePort);
  conn.setEncoding('utf8');

tgoldenberg

Verifying my Blockstack ID is secured with the address 1BWE9yVyk8hvDfoKCqMSSLQ6UvE7veo1yN https://explorer.blockstack.org/address/1BWE9yVyk8hvDfoKCqMSSLQ6UvE7veo1yN

tgoldenberg

import decode from 'jwt-decode';
import jwt from 'njwt';
import { ec } from 'elliptic';

var eccrypto = require('eccrypto');
var crypto = require('crypto');

// sender
var privKey1 = crypto.randomBytes(32);
var pubKey1 = eccrypto.getPublic(privKey1);

tgoldenberg

import BlockClass from 'classes/Block';
import BlockModel from 'models/Block';
import SHA256 from 'js-sha256';
import { isNodeSynced } from 'net/isNodeSynced';
import { isTxValid } from 'utils/validateBlock';
import request from 'utils/request';
import store from 'store/store';

const MIN_TX_PER_BLOCK = 1;