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)

Building the /blockchain endpoint

Let's continue building our blockchain API. In this section, we are going to interact with our /blockchain endpoint. This means that we will have to import our blockchain from our blockchain.js file:

const Blockchain = require('./blockchain');

We have now imported our blockchain data structure or our blockchain constructor function. Next, we want to make an instance of our blockchain. We can do that as follows:

const bitcoin = new Blockchain();

Now we have an instance of our blockchain constructor function and we have called it bitcoin. You can call this whatever you want, but I'm just going to call it bitcoin to keep it simple.

Let's build on our /blockchain endpoint. All this endpoint is going to do is send our entire blockchain back to whoever called this endpoint. To do that, we are going to add a line that will send...