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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Setting up the Project

Setting up the Project

What is a blockchain?

What you will learn...

Environment setup

Building a Blockchain

Building a Blockchain

Before we get building...

Blockchain constructor function

Building the createNewBlock method

Building the getLastBlock method

Creating the createNewTransaction method

Hashing the data

What is a Proof of Work?

Creating a genesis block

Accessing the Blockchain through an API

Accessing the Blockchain through an API

Setting up Express.js

Building the API foundation

Installing Postman and body-parser

Building the /blockchain endpoint

Building the /transaction endpoint

Building the /mine endpoint

Testing the endpoints

Creating a Decentralized Blockchain Network

Creating a Decentralized Blockchain Network

Creating multiple nodes

Adding the currentNodeUrl

New endpoints outline

Building the /register-and-broadcast-node endpoint

Building the /register-node endpoint

Building the /register-nodes-bulk endpoint

Testing all of the network endpoints

Synchronizing the Network

Synchronizing the Network

Understanding the need to synchronize the network

Refactoring the createNewTransaction method and the /transaction endpoint

Building the /transaction/broadcast endpoint

Refactoring the /transaction endpoint

Testing the transaction endpoints

Updating the mining information

Building the /receive-new-block endpoint

Testing the new and updated /mine endpoints

Consensus Algorithms

Consensus Algorithms

What is the consensus algorithm ?

Building the chainIsValid method

Building the /consensus endpoint

Block Explorer

What is a block explorer?

Defining the block explorer endpoints

Building the getBlock method

Building the /block/:blockHash endpoint

Defining the getTransaction method

Building the /transaction/:transactionId endpoint

Building the getAddressData method

Developing the /address/:address endpoint

Adding the block explorer file

Block explorer file explanation

Testing our block explorer

In conclusion...

In conclusion...

Areas of improvement

Other Books You May Enjoy

Other Books You May Enjoy

Leave a review - let other readers know what you think

Customer Reviews

5 star

0

4 star

0

3 star

0

2 star

0

1 star

0

Other Books You May Enjoy

If you enjoyed this book, you may be interested in these other books by Packt:

Learn Bitcoin and Blockchain
Kirankalyan Kulkarni

ISBN: 9781789536133

Understand the concept of decentralization, its impact, its relationship with blockchain technology and its pros and cons
Learn blockchain and bitcoin architectures and security
Explore bitcoin and blockchain security
Implement blockchain technology and its features commercially
Understand why consensus protocols are critical in blockchain
Get a grip on the future of blockchain

Building Enterprise JavaScript Applications
Daniel Li

ISBN: 9781788477321

Practice Test-Driven Development (TDD) throughout the entire book
Use Cucumber, Mocha and Selenium to write E2E, integration, unit and UI tests
Build stateless APIs using Express and Elasticsearch
Document your API using OpenAPI and Swagger
Build and bundle...