Book Image

Learn Blockchain Programming with JavaScript

By : Eric Traub
Book Image

Learn Blockchain Programming with JavaScript

By: Eric Traub

Overview of this book

Learn Blockchain Programming with JavaScript begins by giving you a clear understanding of what blockchain technology is. You’ll then set up an environment to build your very own blockchain and you’ll add various functionalities to it. By adding functionalities to your blockchain such as the ability to mine new blocks, create transactions, and secure your blockchain through a proof-of-work you’ll gain an in-depth understanding of how blockchain technology functions. As you make your way through the chapters, you’ll learn how to build an API server to interact with your blockchain and how to host your blockchain on a decentralized network. You’ll also build a consensus algorithm and use it to verify data and keep the entire blockchain network synchronized. In the concluding chapters, you’ll finish building your blockchain prototype and gain a thorough understanding of why blockchain technology is so secure and valuable. By the end of this book, you'll understand how decentralized blockchain networks function and why decentralization is such an important feature for securing a blockchain.
Table of Contents (10 chapters)

Creating the createNewTransaction method

The next method that we are going to add to our blockchain constructor function is called createNewTransaction. This method will create a new transaction for us. Let's follow the below mentioned steps to create the method:

  1. Start building up this method by adding the following line of code after our getLastBlock method:
Blockchain.prototype.createNewTransaction = function () {

  1. The function () will take three parameters, such as the following:
Blockchain.prototype.createNewTransaction = function (amount, sender, recipient) {


What these three parameters will do is as follows:

  • amount: This parameter will take in the amount of the transaction or how much is being sent in this transaction.
  • sender: This will take in the sender's address.
  • recipient: This will take in the recipient's address.
  1. The next thing that we want...