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Index
Title Page
Copyright and Credits
Blockchain for Enterprise
Packt Upsell
Why subscribe?
packt.com
Contributors
About the author
About the reviewers
Packt is searching for authors like you
Preface
Who this book is for
What this book covers
To get the most out of this book
Download the example code files
Conventions used
Get in touch
Reviews
What are Decentralized Applications?
What is a DApp?
What is a blockchain?
Understanding Byzantine Fault Tolerance
Representation of user accounts
What are UTXOs?
Popular permissioned blockchain platforms
Ethereum
Quorum
Parity
MultiChain
Hyperledger Fabric 1.0
BigchainDB
InterPlanetary File System
Corda
Transaction validity
Hyperledger Sawtooth
Popular blockchain use cases
Everledger
Walmart's food tracking
Ghana's land registry
Dubai's housing rental
Project Ubin
Summary
Building Blockchain Using Quorum
Overview of Quorum
Ethereum accounts
What are Ethereum transactions?
What is a Merkle tree?
What is forking in blockchain?
Raft consensus
Istanbul Byzantine Fault Tolerence
Private contracts and constellation
Installing Quorum and constellation
Build your first Raft network
Setting up a constellation network
Generating enodes
Creating an account
Creating the genesis block
Starting nodes
Adding or removing nodes dynamically
Building your first IBFT network
Installing IBFT tools
Creating a genesis block
Starting nodes
Adding or removing a validator dynamically
Summary
Writing Smart Contracts
Solidity source files
The structure of a smart contract
Data locations in Solidity
The different types of data
Arrays
Strings
Structs
Enums
Mappings
The delete operator
Conversion between elementary types
Using var
Control structures
Creating contracts using the new operator
Exceptions
External function calls
Features of contracts
Visibility
Function modifiers
The fallback function
Inheritance
The super keyword
Abstract contracts
Libraries
using for
Returning multiple values
Importing other Solidity source files
Globally-available variables
Block and transaction properties
Address-type-related variables
Contract-related variables
Ether units
Proof of existence, integrity, and ownership contract
Compiling and deploying contracts
Summary
Getting Started with web3.js
Introduction to web3.js
Importing web3.js
Connecting to nodes
The API structure
BigNumber.js
Unit conversion
Retrieving gas price, balance, and transaction details
Sending ether
Working with contracts
Retrieving and listening to contract events
Building a client for the ownership contract
The project structure
Building the backend
Building the frontend
Testing the client
Summary
Building Interoperable Blockchains
Understanding blockchain interoperability
What can interoperable blockchains achieve?
Strategies for implementing blockchain interoperability
Single custodian
Multisignature federation
Sidechains or relays
Hash locking
Building a FedCoin
Smart contracts to digitalize fiat currency
Atomic swap smart contracts
Testing
Summary
Building Quorum as a Service Platform
Introduction to cloud computing
Private versus public versus hybrid cloud
IaaS versus PaaS and SaaS
What are containers?
Introduction to Docker
Building a Hello World Docker container
Understanding the microservices architecture
Diving into K8s
Getting into resource objects
Deployments and pods
Services
Ingress controllers and resources
ConfigMaps and secrets
Bind mounts and volumes
Labels and selectors
Getting started with minikube
Installing minikube on macOS
Installing minikube on Ubuntu
Installing minikube on Windows
Starting minikube
Stopping and deleting minikube
Minikube status
Accessing the K8s dashboard
Deploying the Hello World app on k8s
Pushing images to Docker Hub
Creating deployments and services
Building QaaS
How does QNM work?
Containerizing QNM
Creating QNM deployment and service mainfest files
Creating nodes using the K8s APIs
Summary
Building a DApp for Digitizing Medical Records
Introduction to EMRs data management and sharing systems
Problems with paper-based medical records
Limitations of EMR data management and sharing systems
Centralized versus decentralized EMR management systems
Ensuring data privacy in a blockchain using PRE
The NuCypher PRE library
Installing the library
Using the library
Architecting DApp for EMRs
Smart contracts for identity and access control
Writing Python and JS scripts for testing
Summary
Building a Payment Solution for Banks
Overview of the payment system
Settlement and clearance of InterBank transfers
Digitalizing fiat currency
Using a cell phone number as identity
Building the network
Network permissioning in Quorum
Building the DApp
Summary
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