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Become a Blockchain Developer with Ethereum and Solidity

Exploring the immersed part of the iceberg

Sebastien Arbogast and Said Eloudrhiri

So many people think the blockchain is just "the technology behind Bitcoin". They get bogged down by all the speculation. But it's so much more than that, and it's this book's mission to help you discover it, and learn how to leverage it to its full potential.

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About

About

About the Book

The blockchain is about so much more than crypto-currencies and financial applications. In fact, some argue that crypto-currencies are to blockchains what the email was to the Internet: an impressive proof-of-concept, but only a first one. The immersed part of the iceberg is this new generation of decentralized applications you can build on top of public blockchains like Ethereum in order to massively disrupt organizations, governance, energy, real estate, and so many more industries, all the way to democracy itself. This book explains everything you need to know about why the blockchain exists, how it works, and more importantly how you can leverage it to build your very own decentralized application. In that regard, it helps you create your first project from scratch, develop your first smart contract and the web application to interact with it, and even shows you how to deploy all of that to an actual blockchain network.

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Computers and Programming

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About the Authors

Sebastien Arbogast

Software engineer by training and by passion, Sebastien has always been fascinated by the impact software can have on our lives, our thinking and our societies. He has always tried to find the most effective and expressive ways to write software so that he could focus on what it could achieve, rather than how it could do it. When he first came in contact with decentralization and blockchain, he was hooked right away, but concerned at the same time: sure, it had enormous potential, but in order to realize it, it needed to involve more people, not only developers but as many people as possible in the general population. And that's why he created the ChainSkills initiative with his friend Said Eloudrhiri, and started giving conferences everywhere, producing online courses with more than 10,000 students and writing books about it. Today, in addition to all of that, Sebastien still develops mobile, web and backend applications for corporate customers and produces a French-speaking podcast, the ProofOfCast, about crypto-currencies, blockchain and decentralization, all the while travelling the world as a digital nomad.

Said Eloudrhiri

Since the beginning of his career in 1992, Said has been involved in several projects as a developer, software architect, team leader or agile coach. This long experience let him identify the potential of some promising technologies while learning how to use them. As a speaker, Said loves to share his experience on different fields such as mobile and web development, agile methodologies or the blockchain. The Ethereum blockchain is one of these promising technologies in which Said is now very involved. Said co-founded ChainSkills with his friend Sébastien Arbogast. This initiative aims at educating managers and developers about the power and techniques of open blockchains as a development platform. They created a course on Udemy and talked about Ethereum in several conferences. Last but not least, Said is a husband and a proud father of three kids.

Contents

Table of Contents

Acknowledgements

Said

  1. Introduction
  2. Why the Blockchain?

How do you represent value?

The Internet of Value

Blockchain Use Cases

  1. What is the Blockchain (and What It’s Not)?

The 3-layer Model

Blockchain Design Goals

Blockchain Implementations

Blockchain Instances

Open Blockchains as tricameral systems

Key Components of a Blockchain

What a blockchain is not (hint: it’s NOT a solution to every problem)

  1. Cryptography 101

Hashing functions

Asymmetric Cryptography

Merkle Trees

  1. Setting Up Your Development Environment

Installing the development environment on MacOS

  1. Homebrew
  2. Geth
  3. Ganache
  4. Node.js and NPM
  5. Truffle 5
  6. Visual Studio Code
  7. Summary

Installing the development environment on Windows

  1. Geth
  2. Ganache
  3. Node.js and NPM
  4. Truffle 5
  5. Visual Studio Code
  6. Git
  7. Summary

Installing the development environment on Linux

  1. Geth
  2. Ganache
  3. Git
  4. Node.js and NPM
  5. Truffle 5
  6. Visual Studio Code
  7. Summary

Create a private Ethereum node on MacOS

  1. Genesis block
  2. Private node
  3. Create 3 accounts
  4. Startup script
  5. Geth console
  6. Send ether between accounts
  7. Stop the private node
  8. Summary

Create a private Ethereum node on Windows

  1. Genesis block
  2. Private node
  3. Create 3 accounts
  4. Startup script
  5. Geth console
  6. Send ether between accounts
  7. Stop the private node
  8. Summary

Create a private Ethereum node on Linux

  1. Genesis block
  2. Private node
  3. Create 3 accounts
  4. Startup script
  5. Geth console
  6. Send ether between accounts
  7. Stop the private node
  8. Summary

Install MetaMask

  1. Protecting your accounts
  2. Installation
  3. Finalize the setup
  4. Welcome page
  5. Initialize the vault
  6. Import accounts
  7. Networks
  8. Change networks and logs
  9. Account Management
  10. Backup potential existing keys (optional)
  11. Help
  12. Summary

Introduction to Solidity: write, compile and deploy a smart contract

  1. DApp, Smart Contract ?
  2. Our case study: Greetings
  3. Start the Ethereum node
  4. Prepare the environment
  5. Create the Smart Contract
  6. Create compilation and deployment scripts
  7. Deploy the contract
  8. Prepare the contract instance
  9. Get current message
  10. Change the message
  11. Summary

Introduction to Truffle: compile and deploy a smart contract

  1. Prepare the environment
  2. Create the project
  3. Analyse the project structure
  4. The Greetings smart contract
  5. Deploy the Greetings smart contract
  6. Deploy the contract
  7. Interact with the contract
  8. Exit the console
  9. Deploy to Ganache
  10. Summary

Transactions and Blocks

  1. Prepare the environment
  2. Inspect the transaction
  3. Inspect the block
  4. Inspect contract calling transactions
  5. Summary

Understanding Gas

  1. Start Ganache
  2. Open the console log
  3. Analyzing transaction cost
  4. Checking account balances
  5. Gas vs Gas Usage
  6. Read the state of a smart contract
  7. Change the smart contract state
  8. Gas and Metamask
  9. Summary

Bytecode, Opcode and EVM

  1. Prepare the environment
  2. Inspect transactions in Ganache
  3. Bytecode and EVM
  4. Bytecode to OpCode
  5. OpCodes and Gas

Sending Ether between accounts

  1. How do you design and develop a DApp?
  2. The ChainList Project

Sell an article - create the smart contract

  1. Prepare the environment
  2. Create the project
  3. Create the contract
  4. Deploy the ChainList contract
  5. Interact with the smart contract
  6. Summary

Sell an article - Tests

  1. Prepare the environment
  2. Testing with JavaScript

Summary

Sell an article - Frontend

  1. Prepare the environment
  2. Analyse the project structure
  3. Run the sample application
  4. Adapt the sample application
  5. Summary

Show the article from the contract in the frontend

  1. Prepare the environment
  2. Connect to the backend
  3. Checkpoint #1 - test your frontend
  4. Summary

Sell an article from the frontend

  1. Prepare the environment
  2. Implement the call to sellArticle
  3. Inspect the transaction
  4. Summary

Sell an article through Metamask

  1. Prepare the environment
  2. Prepare Metamask
  3. Configure the Dapp
  4. Run the Dapp
  5. Sell an article
  6. Summary

Be notified when an article goes for sale (contract)

  1. Prepare the environment
  2. Add the event
  3. Interact with the smart contract
  4. Update our test
  5. Summary

Be notified when an article goes for sale (frontend)

  1. Prepare the environment
  2. Listen to events
  3. Display the event
  4. Test your frontend
  5. Summary

Deployment to a private network

  1. Prepare the environment
  2. Deploy contracts to your private network
  3. Test your frontend
  4. Summary

Buy an article (contract)

  1. Prepare the environment
  2. Add the buy feature
  3. Interact with the smart contract
  4. Exceptions
  5. Summary

Testing the article buying functionality

  1. Prepare the environment
  2. Update the Happy Path Test Suite
  3. Add the Exceptions Test Suite
  4. Summary

Buy an article (frontend)

  1. Prepare the environment
  2. Update the frontend
  3. Step 2-3: Update the display of an article (JS function)

Step 3: Test the implementation

  1. Summary
  2. Bonus: Subscribe to events by default

Managing several sellers and buyers (contract)

  1. Prepare the environment
  2. Implement the Article structured type
  3. Declare the mapping
  4. Make it possible to sell multiple articles
  5. Make it possible to buy a specific article
  6. Getters
  7. Interact with the smart contract
  8. Summary

Testing your contract’s multiple article management

  1. Prepare the environment
  2. Update the Happy Path Test Suite
  3. Update the Exceptions Test Suite
  4. Summary

Managing several sellers and buyers (frontend)

  1. Prepare the environment
  2. Update the frontend
  3. Test the implementation
  4. Summary

Smart contract deactivation

  1. Prepare the environment
  2. Adapt the contract
  3. Test the contract
  4. Summary

Function modifiers

  1. Prepare the environment
  2. Create a function modifier
  3. Test the contract
  4. Summary

Contract inheritance

  1. Prepare the environment
  2. Create the base contract
  3. Extend the Ownable contract
  4. Test the contract
  5. Bonus
  6. Summary

Deployment of ChainList to our private network

  1. Prepare the environment
  2. Deploy the Dapp frontend
  3. Test the Dapp on Geth
  4. Summary

Dapp deployment to public networks

  1. Why Infura?
  2. Why Ropsten?
  3. Create your Infura account
  4. Create a project
  5. Create a HD Wallet
  6. Deposit some ether
  7. Configure the project
  8. Deploy to Infura
  9. Use ChainList on Ropsten
  10. Deploy to the Main Net
  11. Summary

Conclusion

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