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)

What is the consensus algorithm ?

When a blockchain is built, it is running across hundreds or thousands of nodes, and every transaction and every block that's being created is broadcast to the entire blockchain network. There's a possibility that during these broadcasts a hiccup could occur, or maybe a certain node doesn't receive a piece of information or a transaction that took place.

There could even be a bad actor inside of the blockchain network, who is sending out false information or creating fraudulent transactions on their copy of a blockchain, and trying to broadcast them to the whole network to convince everybody that they are legitimate transactions. So, how do we solve this problem so that there are only legitimate blocks in the blockchain network?

This is where the consensus algorithm is going to help us out. The consensus algorithm will provide...