Book Image

Blockchain Quick Start Guide

By : Xun (Brian) Wu, Weimin Sun
Book Image

Blockchain Quick Start Guide

By: Xun (Brian) Wu, Weimin Sun

Overview of this book

Blockchain is a technology that powers the development of decentralized applications.This technology allows the construction of a network with no single control that enables participants to make contributions to and receive benefits from the network directly. This book will give you a thorough overview of blockchain and explain how a blockchain works.You will begin by going through various blockchain consensus mechanisms and cryptographic hash functions. You will then learn the fundamentals of programming in Solidity – the defacto language for developing decentralize, applications in Ethereum. After that, you will set up an Ethereum development environment and develop, package, build, and test campaign-decentralized applications.The book also shows you how to set up Hyperledger composer tools, analyze business scenarios, design business models, and write a chain code. Finally, you will get a glimpse of how blockchain is actually used in different real-world domains. By the end of this guide, you will be comfortable working with basic blockchain frameworks, and develop secure, decentralized applications in a hassle-free manner.
Table of Contents (14 chapters)
Title Page
Copyright and Credits
About Packt

Business network archive

Composer business is comprised of four different types of files: model file (.cto), script file (.js), access control list (ACL) file (.acl), and query file (.qry).

Network model file (.cto)

A CTO file is composed of the following elements:



A single namespace

Defines the composer model namespace; every .cto model file requires a namespace.

Resources - asset

Anything of value that can be exchanged between parties.

Resources - participant

Business network member.

Resources - enum

A data type consisting of a set of named values.

Resources - concept

Any object you want to model that is not one of the other types.

Resources - transactions

Defines the blockchain business logic.

Resources - events

Blockchain transaction notification.


Imports resources from other namespaces.


The composer model language, like other programming languages, has data types including String, Double, Integer, and so on.

Let's see some samples of assets, participants, transactions, and events...