Book Image

Hands-On Blockchain with Hyperledger

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

Hands-On Blockchain with Hyperledger

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

Overview of this book

Blockchain and Hyperledger technologies are hot topics today. Hyperledger Fabric and Hyperledger Composer are open source projects that help organizations create private, permissioned blockchain networks. These find application in finance, banking, supply chain, and IoT among several other sectors. This book will be an easy reference to explore and build blockchain networks using Hyperledger technologies. The book starts by outlining the evolution of blockchain, including an overview of relevant blockchain technologies. You will learn how to configure Hyperledger Fabric and become familiar with its architectural components. Using these components, you will learn to build private blockchain networks, along with the applications that connect to them. Starting from principles first, you’ll learn to design and launch a network, implement smart contracts in chaincode and much more. By the end of this book, you will be able to build and deploy your own decentralized applications, handling the key pain points encountered in the blockchain life cycle.

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Table of Contents (20 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Packt Upsell
Packt Upsell
Foreword
Foreword
Contributors
Contributors
Preface
Preface
Free Chapter
1
Blockchain - Enterprise and Industry Perspective
Blockchain - Enterprise and Industry Perspective
Defining the terms – what is a blockchain?
Four core building blocks of blockchain framworks
Fundamentals of the secure transaction processing protocol
Where blockchain technology has been and where it's going
Industries putting blockchain technology to work
Blockchain in the enterprise
Enterprise design principles
Business considerations for choosing a blockchain framework
Technology considerations for choosing a blockchain framework
Enterprise integration and designing for extensibility
Other considerations
Summary
2
Exploring Hyperledger Fabric
Exploring Hyperledger Fabric
Building on the foundations of open computing
Hyperledger frameworks, tools, and building blocks
Hyperledger Fabric component design
Hyperledger Fabric – the journey of a sample transaction
Hyperledger Fabric explored
Understanding governance in business networks powered by blockchain
Summary
3
Setting the Stage with a Business Scenario
Setting the Stage with a Business Scenario
Trading and letter of credit
Business scenario and use case
Setting up the development environment
Network components' configuration files
Launching a sample trade network
Summary
4
Designing a Data and Transaction Model with Golang
Designing a Data and Transaction Model with Golang
Starting the chaincode development
Creating a chaincode
Access control
Implementing chaincode functions
Testing chaincode
Chaincode design topics
Logging output
Summary
5
Exposing Network Assets and Transactions
Exposing Network Assets and Transactions
Building a complete application
Integration with existing systems and processes
Summary
6
Business Networks
Business Networks
A busy world of purposeful activity
Defining business networks
Introducing participants
Introducing assets
Introducing transactions
Discussing events from the perspective of designing a business network using Composer
Implementing a business network
Summary
7
A Business Network Example
A Business Network Example
The letter of credit sample
Analyzing the letter of credit process
A description of the business network
A model of the business network
Examining the live network
Creating business network APIs
Summary
8
Agility in a Blockchain Network
Agility in a Blockchain Network
Defining the promotion process
Configuring a continuous integration pipeline
Configuring your Git repository
Testing the end-to-end process
Updating the network
Summary
9
Life in a Blockchain Network
Life in a Blockchain Network
Modifying or upgrading a Hyperledger Fabric application
System monitoring and performance
Summary
10
Governance, Necessary Evil of Regulated Industries
Governance, Necessary Evil of Regulated Industries
Decentralization and governance
Exploring the business models
Role of governance in a business network
Business domains and processes
Governance structure
Governance and the IT solution
Summary
11
Hyperledger Fabric Security
Hyperledger Fabric Security
Hyperledger Fabric design goals impacting security
Hyperledger Fabric architecture 
Network bootstrap and governance – the first step towards security
Strong identities – the key to the security of the Hyperledger Fabric network
Chaincode security
Common threats and how Hyperledger Fabric mitigates them 
Hyperledger Fabric and Quantum Computing
General data protection regulation (GDPR) considerations
Summary
12
The Future of Blockchain and the Challenges Ahead
The Future of Blockchain and the Challenges Ahead
Summary of key Hyperledger projects
The road ahead for Blockchain
Staying engaged with the Hyperledger blockchain 
Summary
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Index
Index

Access control

Before we delve into the implementation of Chaincode functions, we need to first define our access control mechanism.

A key feature of a secure and permissioned blockchain is access control. In Fabric, the Membership Services Provider (MSP) plays a pivotal role in enabling access control. Each organization of a Fabric network can have one or more MSP providers. The MSP is implemented as a Certificate Authority (Fabric CA). More information on Fabric CA, including its documentation, is available at: https://hyperledger-fabric-ca.readthedocs.io/.

Fabric CA issues Enrollment Certificates (ecerts) for network users. The ecert represents the identity of the user and is used as a signed transaction when a user submits to Fabric. Prior to invoking a transaction, the user must therefore first register and obtain an ecert from the Fabric CA.

Fabric supports an Attribute-based Access Control (ABAC) mechanism that can be used by the chaincode to control access to its functions and data...

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