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.
Table of Contents (20 chapters)
Title Page
Copyright and Credits
Packt Upsell

Chaincode security

In Fabric, smart contracts, also known as chaincode, can be written in Go or JavaScript. The chaincodes must be installed on a peer and then explicitly initiated. When initiated, each code runs in a separate Docker container. The previous versions of chaincode also run in separate Docker containers.

The Docker container running the chaincode has access to the virtual network as well as the entire networking stack. If care is not taken in carefully reviewing the chaincode before it gets installed on the peer, and isolating the network access for that chaincode, it could result in a malicious or misconfigured node probing or attaching the peer attached to the same virtual network.


An operator can configure a policy to disable all outgoing or incoming network traffic on the chaincode Docker containers, except white-listed nodes.

How is chaincode shared with other endorsing peers?

Organizations must establish a process for sharing chaincode with other other organizations participating...