Hands-On Blockchain for Python Developers电子书

Title Page

Copyright and Credits

Hands-On Blockchain for Python Developers

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Foreword

Contributors

About the author

About the reviewer

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Preface

Who this book is for

What this book covers

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Download the example code files

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Conventions used

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Section 1: Blockchain and Smart Contracts

Introduction to Blockchain Programming

The rise of cryptocurrency and blockchain

Blockchain technology

Signing data in blockchain

From linked list to blockchain

Cryptography

Symmetric and asymmetric cryptography

The hashing function

Proof of work

Consensus

Coding on the blockchain

Other types of blockchain programmers

Summary

References

Smart Contract Fundamentals

Installing an Ethereum development environment

Installing Node.js

Installing Truffle and Solidity

Installing Ganache

Writing a smart contract

Deploying a smart contract to Ethereum blockchain

Interacting with smart contracts

Sending ether to smart contracts

Why smart contracts?

Summary

Further reading

Implementing Smart Contracts Using Vyper

Motivations behind Vyper

Installing Vyper

Creating a smart contract with Vyper

Deploying a smart contract to Ganache

Interacting with smart contracts

Going deeper into Vyper

Data types

Withdrawing ethers

Other data types

Useful built-in functions

Events

Interacting with other smart contracts

Compiling code programmatically

Other tricks

Summary

Section 2: Web3 and Populus

Interacting with Smart Contracts Using Web3

Introduction to decentralized applications

Installing web3

Geth

Geth console

Understanding the web3.py library

Gas and gas price

Nonce

Creating a transaction on Rinkeby

Interacting with smart contracts using web3.py

Launching a smart contract with Geth

Launching a smart contract with web3

Playing with a smart contract

Summary

Populus Development Framework

Setting up Populus

Adding support for Vyper

Smart contract unit test

Using arguments in the constructor

Deploying a smart contract with Populus

Summary

Building a Practical Decentralized Application

Developing a simple voting application

Deploying a smart contract that has arguments in its constructor

Developing a commercial voting application

Developing a token-based voting application

Summary

Further reading

Section 3: Frontend Decentralized Applications

Frontend Decentralized Application

Setting up the Qt GUI library

Choosing a GUI library

Installing Qt for Python

Crash course on Qt for Python

Layout

Other widgets

Callback

Threading

Writing the smart contract for the Twitter–like application

Test

Fixtures

Building the GUI frontend for the Twitter–like application

Summary

Section 4: Cryptocurrency and Wallets

Creating Token in Ethereum

Token smart contract

Mist

ERC20

Selling a token

Stable coin

Summary

Further reading

Cryptocurrency Wallet

Advanced features of the PySide2 library

Testing application

Advanced features of Qt for Python or PySide2

Building a cryptocurrency wallet

Blockchain class

Thread classes

Identicon and Icons

Building widgets

Account widget

Sending a transaction widget

Token widget

Test

Considerations when building a cryptocurrency wallet

Security

User experience

Summary

Section 5: Decentralized Filesystem

InterPlanetary - A Brave New File System

The motivation behind IPFS

Merkle DAG

Merkle tree

Directive Acrylic Graphs (DAGs)

Content addressing

The Merkle DAG data structure

Peer-to-peer networking

The notion of closeness of data and nodes

XOR distance

Buckets

Summary

Using ipfsapi to Interact with IPFS

Installing the IPFS software and its library

Content hashing

Protobuf

Multihash

Base58

Combining protobuf, multihash, and base58

The ipfsapi API

IPNS

Pinning

Pubsub

Mutable File System

Other APIs

Summary

Further reading

Implementing a Decentralized Application Using IPFS

Architecture of the decentralized video-sharing application

Architecture of a video-sharing smart contract

Architecture of a video-sharing web application

Writing the video-sharing smart contract

Launching a private Ethereum blockchain

Creating a bootstrap script

Building the video-sharing web application

Views

Models

Templates

Urls

Demo

Note

Summary

Further reading

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