Book Image

Mastering Blockchain - Third Edition

By : Imran Bashir
Book Image

Mastering Blockchain - Third Edition

By: Imran Bashir

Overview of this book

Blockchain is the backbone of cryptocurrencies, with applications in finance, government, media, and other industries. With a legacy of providing technologists with executable insights, this new edition of Mastering Blockchain is thoroughly revised and updated to the latest blockchain research with four new chapters on consensus algorithms, Serenity (the update that will introduce Ethereum 2.0), tokenization, and enterprise blockchains. This book covers the basics, including blockchain’s technical underpinnings, cryptography and consensus protocols. It also provides you with expert knowledge on decentralization, decentralized application development on Ethereum, Bitcoin, alternative coins, smart contracts, alternative blockchains, and Hyperledger. Further, you will explore blockchain solutions beyond cryptocurrencies such as the Internet of Things with blockchain, enterprise blockchains, tokenization using blockchain, and consider the future scope of this fascinating and disruptive technology. By the end of this book, you will have gained a thorough comprehension of the various facets of blockchain and understand their potential in diverse real-world scenarios.
Table of Contents (24 chapters)

The layout of a Solidity source code file

In the following subsections, we will look at the components of a Solidity source code file, which is important to cover before we move on to writing smart contracts in the next section.

Version pragma

In order to address compatibility issues that may arise from future versions of the solc version, pragma can be used to specify the version of the compatible compiler as in the following example:

pragma solidity ^0.5.0

This will ensure that the source file does not compile with versions lower than 0.5.0 and versions starting from 0.6.0.


Import in Solidity allows the importing of symbols from the existing Solidity files into the current global scope. This is similar to import statements available in JavaScript, as in the following:, for example:

import "module-name";


Comments can be added to the Solidity source code file in a manner similar to the C language. Multiple...