Book Image

Blockchain with Hyperledger Fabric - Second Edition

By : Nitin Gaur, Anthony O'Dowd, Petr Novotny, Luc Desrosiers, Venkatraman Ramakrishna, Salman A. Baset
Book Image

Blockchain with Hyperledger Fabric - Second Edition

By: Nitin Gaur, Anthony O'Dowd, Petr Novotny, Luc Desrosiers, Venkatraman Ramakrishna, Salman A. Baset

Overview of this book

Blockchain with Hyperledger Fabric - Second Edition is a refreshed and extended version of the successful book on practical Hyperledger Fabric blockchain development. This edition includes many new chapters, alongside comprehensive updates and additions to the existing ones. Entirely reworked for Hyperledger Fabric version 2, this edition will bring you right up to date with the latest in blockchain. Using a real-world Trade Finance and Logistics example, with working code available on GitHub, you’ll really understand both how and why Hyperledger Fabric can be used to maximum effect. This book is your comprehensive guide and reference to explore and build blockchain networks using Hyperledger Fabric version 2. This edition of the book begins by outlining the evolution of blockchain, including an overview of relevant blockchain technologies. Starting from first principles, you’ll learn how to design and operate a permissioned blockchain network based on Hyperledger Fabric version 2. You will learn how to configure the main architectural components of a permissioned blockchain network including Peers, Orderers, Certificate Authorities, Channels, and Policies. You’ll then learn how to design, develop, package, and deploy smart contracts, and how they are subsequently used by applications. This edition also contains chapters on DevOps, blockchain governance, and security, making this your go-to book for Hyperledger Fabric version 2.
Table of Contents (18 chapters)
Another Book You May Enjoy

Wallets and identity

We've already seen how identity is central to multi-party transactions; the transaction input is signed by the transaction proposer, and the transaction responses are signed by the endorsing organizations. Moreover, we're going to see how a user's identity associates them with a role in their organization, which in turn determines how they can access resources in the network.

Using an identity

Because of the central role that identity plays in a Hyperledger Fabric network, it makes sense that the first thing an application must do is select an identity to use. Let's look at an example:

Figure 7.7: A wallet stores a user's identity for interaction with the network

In Figure 7.7, we can see how organizations A, B, and C use a channel to form a blockchain network. Organization A owns a set of infrastructure components for use in this network channel, namely Peers 1, 2, and 3 and a certificate authority CA1. Similarly...