Book Image

Building Blockchain Projects

By : Narayan Prusty
Book Image

Building Blockchain Projects

By: Narayan Prusty

Overview of this book

Blockchain is a decentralized ledger that maintains a continuously growing list of data records that are secured from tampering and revision. Every user is allowed to connect to the network, send new transactions to it, verify transactions, and create new blocks, making it permission-less. This book will teach you what blockchain is, how it maintains data integrity, and how to create real-world blockchain projects using Ethereum. With interesting real-world projects, you will learn how to write smart contracts which run exactly as programmed without any chance of fraud, censorship, or third-party interference, and build end-to-e applications for blockchain. You will learn about concepts such as cryptography in cryptocurrencies, ether security, mining, smart contracts, solidity, and more. You will also learn about web sockets, various API services for Ethereum, and much more. The blockchain is the main technical innovation of bitcoin, where it serves as the public ledger for bitcoin transactions.
Table of Contents (16 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

Whisper and Swarm

Whisper and Swarm are a decentralized communication protocol and a decentralized storage platform respectively, being developed by Ethereum developers. Whisper is a decentralized communication protocol, whereas Swarm is a decentralized filesystem.

Whisper lets nodes in the network communicate with each other. It supports broadcasting, user-to-user, encrypted messages, and so on. It's not designed to transfer bulk data. You can learn more about Whisper at, and you can see a code example overview at

Swarm is similar to Filecoin, that is, it differs mostly in terms of technicalities and incentives. Filecoin doesn't penalize stores, whereas Swarm penalizes stores; therefore, this increases the file availability further. You must be wondering how incentive works in swarm. Does it have an internal currency? Actually, Swarm doesn't have an internal currency, rather it uses ether...