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You're reading from Blockchain By Example A developer's guide to creating decentralized applications using Bitcoin, Ethereum, and Hyperledger

Product type Paperback

Published in Nov 2018

Publisher Packt

ISBN-13 9781788475686

Length 528 pages

Edition 1st Edition

Languages

Solidity

Tools

Bitcoin

Concepts

Blockchain

Authors (3):

Xun (Brian) Wu

Bellaj Badr

Richard Horrocks

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Table of Contents (13) Chapters

Preface

1. Say Hello to Blockchain FREE CHAPTER

2. Building a Bitcoin Payment System

3. Building Your Own Cryptocurrency

4. Peer-to-Peer Auctions in Ethereum

5. Tontine Game with Truffle and Drizzle

6. Blockchain-Based Futures System

7. Blockchains in Business

8. Creating an ICO

9. Distributed Storage IPFS and Swarm

10. Supply Chain on Hyperledger

11. Letter of Credit (LC) Hyperledger

12. Other Books You May Enjoy

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Java client

As introduced earlier in this chapter, we are building a simple Java application using web3j. Let's understand briefly the mechanics behind this API.

Web3j is the Java port of Ethereum's web3 API, which manages communication (JSON-RPC) between Ethereum clients and the network. For each smart contract, web3j generates a wrapper class, simplifying the access and smart contract interaction with Ethereum. Thus, all complexities will be hidden and you will not be forced to initiate RPC calls on your own. The following diagram (from the official documentation) depicts the interaction flow between web3j and Ethereum:

The wrapper generator

Before using web3j, we need to build the Java wrapper class for our...

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Authors (3)

Badr

Bellaj Badr is an experienced security and software engineer who loves blockchain with a passion. Currently, he is the CTO at Mchain, a blockchain start-up that develops blockchain solutions for companies. Alongside his role as CTO, he acts as technical consultant, offering strategic and technical consulting to many companies worldwide. Aside from this, he is involved in many blockchain projects involving the establishment of new blockchain business-oriented protocols. Badr is a frequent speaker at developer conferences and is father to two angels.

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Horrocks

Richard Horrocks is a freelance Ethereum and full-stack developer based in the UK, and holds a BA and MSc in natural sciences from the University of Cambridge. He worked for many years as a technical lead for Cisco Systems, where he worked on the operating systems of carrier-grade routing hardware, before leaving the world of IT to work as an English teacher. The advent of cryptocurrency piqued his interest sufficiently to lead him back to IT, and, since 2015, he has been working with Ethereum and other cryptocurrencies. His specialist interests are cryptoeconomics and incentive layers, with a particular focus on mechanism design and token engineering. When not in front of a computer, he enjoys yoga and falling off motorbikes.

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Xun (Brian) Wu

Xun (Brian) Wu is a senior blockchain architect and consultant. With over 20 years of hands-on experience across various technologies, including Blockchain, big data, cloud, AI, systems, and infrastructure, Brian has worked on more than 50 projects in his career. He has authored nine books, which have been published by O'Reilly, Packt, and Apress, focusing on popular fields within the Blockchain industry. The titles of his books include: Learn Ethereum (First Edition), Learn Ethereum (Second Edition), Blockchain for Teens, Hands-On Smart Contract Development with Hyperledger Fabric V2, Hyperledger Cookbook, Blockchain Quick Start Guide, Security Tokens and Stablecoins Quick Start Guide, Blockchain by Example, and Seven NoSQL Databases in a Week.

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