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)

Testing the transaction endpoints

Let's test the /transaction/broadcast and /transaction endpoints to make sure that they are both working together correctly.

For this test, the first thing that we need to do is connect all the nodes together to make a network. You might remember how to do this, as we learned about it in Chapter 4, Creating a Decentralized Blockchain Network. We'll run through the steps quickly anyway, to refresh your memory.

Recapping how to create the network

Take a look at the following steps to understand how to connect all the nodes:

  1. Go to Postman and hit the /register-and-broadcast-node route. This can be done on any of your nodes. In our example, let's use localhost:3001.
  2. Now, inside...