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Index
Title Page
Copyright and Credits
Blockchain Quick Start Guide
About Packt
Why subscribe?
Packt.com
Contributors
About the authors
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
Introduction to Blockchain Technology
The genealogy analogy
Bitcoin
Why Bitcoin
A peer-to-peer network
Cryptography and hash functions
The distributed ledger, blocks, transactions, addresses, and UTXO
The consensus mechanism
Forking
Mining and difficulty level
Hacking – the 51% problem
Private keys and Bitcoin wallets
Bitcoin scripting
Altcoins
Ethereum
Enterprise blockchain – Hyperledger
The evolution of blockchain
Summary
Ethereum Fundamentals
An overview of Ethereum
Ethereum basic concepts
Ether
ERC20 tokens
Smart contracts
Ethereum virtual machines
Ethereum gas
Account
Oracle
Other concepts
Performance
Throughput
Proof-of-Stake (PoS)
Casper
Plasma
Sharding
Summary
Overview of Solidity Programming
What is solidity?
Tools for solidity development environment
Browser-based IDE
Remix
EthFiddle
Command-line development management tools
Truffle
Introduction to smart contracts
Layout of a solidity source file
Pragma
Comments
Import
Paths
Relative paths
Structure of a contract
State variables
Data type
Enum type
Struct type
Mapping
Functions
Input parameters
Access modifiers
Output parameters
Modifiers
Events
Constructor
Constant state variables, unit, and functions
Ether units
Time units
Inheritance, abstract, and interface
Common smart contract patterns
Access restriction
State machine
Smart contract security
Keep contract simple and modular
Use the checks-effects-interactions pattern
DoS with block gas limit
Handle errors in external calls
Case study – crowdfunding campaign
Summary
Building an Ethereum Blockchain Application
Decentralized application overview
web3.js quick overview
Provider
DApp development tools
Truffle
Ganache
Setting up an Ethereum development environment
Installing Truffle
Installing Ganache
Creating a Truffle project
Launching the Ganache environment
Deploying a smart contract
Writing a campaign decentralized application
Selecting a web3 provider
Loading account information
Loading project information
Handling the fund function
checkGoalReached
Summary
Exploring an Enterprise Blockchain Application Using Hyperledger Fabric
Key concepts in Hyperledger Fabric
Ledger
Chaincode
Channel
Core component model
Peers
Membership service provider (MSP)
Certificate authority (CA)
Ordering service
Hyperledger Fabric basic transaction flow
Issuance claim
Setting up a Hyperledger Fabric environment
Installation prerequisites
Installing Hyperledger Fabric
Writing chaincode
Development tools
LiteIDE
JetBrains Gogland
Visual Studio Code
Chaincode key concept and APIs
Defining an issuance claim
Initializing the chaincode
Invoking the chaincode
AddCompany
ReportLost
RequestedInfo
SubmitClaim, ConfirmClaimSubmission, ApproveClaim
Query
getHistory
Configuring Hyperledger Fabric
Generating the certificate
Generating an orderer genesis block
Generating a channel configuration transaction
Overview of Hyperledger Fabric Docker composer configuration files
Fabric project directory structure
Docker-compose-base.yaml
Peer-base.yaml
Starting the Hyperledger Fabric network
Creating a channel
Joining channels
Updating the anchor
Installing chaincode
Instantiating the chaincode
Invoking add broker
Invoking add insurer
Invoking ReportLost
Invoking RequestedInfo
Invoking SubmitClaim
Invoking ConfirmClaimSubmission
Invoking ApproveClaim
Querying claim history
End-to-end test execution
Summary
Implementing Business Networks Using Hyperledger Composer
Hyperledger Composer – a quick overview
Yeoman generator
Composer REST server
LoopBack connector
JavaScript SDK
Composer playground
Composer-cli
Setting up a Hyperledger Composer environment
Installation prerequisites
Installing the development environment
Analyzing business scenarios
Business network archive
Network model file (.cto)
Script file (.js)
Access control list (ACL) file (.acl)
Query file (.qry)
Designing business models
Implementing the business transaction function
Testing in the playground
Deploying a business network
Integrating with REST server
Generating the Hyperledger Composer REST API
Summary
Blockchain Use Cases
Blockchain use case examples
Payment and settlement services
Import and export finance
Immutable ledger
Regulatory compliance and auditing
Identity theft detection
Funds back-office operation
Collateral management
Healthcare systems
Real estate trading and rental markets
IP market
Elections
HR and recruiting
Public records
Reduce contract disputes
Sharing economy
Integration with IoT
Facilitate commercial and social relationships
How to choose a proper use case
DApp use case – healthcare data sharing
The business problem
A blockchain solution
Summary
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