Introduction to Ethereum Smart Contracts
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The document provides an introduction to Ethereum smart contracts, detailing their conceptual and technical definitions along with how to write them using the Solidity programming language. It outlines smart contract tooling, best practices for security and performance, and showcases the integration of smart contracts with decentralized applications (dApps). Additionally, it includes resources for further learning and practical examples for hands-on experience.
Introduction to Ethereum Smart Contracts
- 1. 1 ArcBlock Technical Learning Series Introduction to Ethereum Smart Contract
- 2. 2 Introduction to Ethereum Smart Contract Shijun 20180927
- 4. Agenda What is Smart Contract? How to write Smart Contract? Smart Contract Tooling? 4 Smart Contract Best Practice?
- 5. Before Dive Into Smart Contract
- 6. Core Concepts of Blockchain 6
- 7. Ethereum Network = Distributed Network 7
- 8. What Is Smart Contract?
- 9. What is Smart Contract? (Conceptual) 9 source: https://github.com/Overtorment/awesome-smart-contracts
- 10. What is Smart Contract? (Technical) 10 source: https://solidity.readthedocs.io/en/v0.4.24/introduction-to-smart-contracts.html Contract = Account Controlled By Immutable Code
- 11. Contract Account vs. User Account 11 12 3
- 12. From Contract Source to Contract Account? 12
- 13. Contract Source & Contract Account 13
- 14. How To Write Smart Contract?
- 15. Solidity Programming Language ๏ Contract oriented, influenced by C++/JS/Python ๏ Statically typed, support inheritance ๏ Source file has .sol extension ๏ Compile to bytecode and run in EVM ๏ Javascript similar syntax (not that similar) 15
- 16. Solidity 101: Primitive Types 16
- 17. Solidity 101: Reference Types 17
- 18. Solidity 101: Functions 18 Assertions Modifiers
- 19. Function Call vs. Transaction 19
- 20. Solidity 101: Global Variables/Fns 20 block util fns
- 21. Demo1 Smart Contract Hello World (Remix: Bytecode + ABI) 21
- 23. Code Editor 23 Remix VSCode + Node.js • Rapid contract prototyping • Testing with existing instance • Deploy to any valid network • Mange code using Git • Save compile/deploy to file • Automate things +
- 24. Debug/Inspection ๏ Block Explorer • etherscan.io • rinkeby.etherscan.io • ropsten.etherscan.io • kovan.etherscan.io ๏ Remix • Debugger mode • Transaction Log 24
- 25. Testnet/Nodes ๏ Ethereum official testnet (real latency) • rinkeby • ropsten • kovan ๏ In memory testnet (low latency) • ganache-cli • remix javascript vm ๏ Infura.io nodes • require registration 25
- 26. Funding for Testing 26 Faucet Builtin Unlocked • Rinkeby Faucet • Ropsten Faucet • Kovan Faucet • Ganache-cli • Remix in memory node
- 27. Transaction Sign/Send 27 GUI SDK • Metamask • Javascript: web3.js • Java: web3j • Swift: web3.swift
- 29. Demo2 Creating ABT Token Using Remix + Metamask + Rinkeby 29
- 30. Smart Contract Best Practice?
- 31. Considerations need to write good Contract ๏ Security • Overflow, using SafeMath library • Identity check and assertion, using function modifiers ๏ Performance • Design storage carefully • Avoid computation intensive contract code: loops ๏ Engineering • Do automated tests • Make code modular 31
- 32. Demo3 Security practices in ArcBlock Token 32
- 33. Where To Go From Here?
- 34. Smart Contract + DApp = Awesome ๏ What is DApp? • End-user app that interacts with contract • An interface that read/render/update contract data • Can be in form of Web/Native/Desktop App • Can be SPA with only blockchain backend 34
- 35. Resources From Community ๏ Official documentation • Solidity • web3.js 1.x ๏ Awesome series • BlockchainLabsNZ/awesome-solidity • cjgdev/awesome-smart-contracts • JoinColony/awesome-web3 • fivedogit/solidity-baby-steps 35
- 36. Resources From Me ๏ Contract + DApp Examples • Lottery App: wangshijun/ethereum-lottery-dapp • ICO DApp (Nuxt.js): wangshijun/ethereum-dapp-nuxt • ICO DApp (Next.js): wangshijun/ethereum-contract-workflow ๏ 掘金小册 • 《从 0 到 1 构建基于以太坊智能合约的 ICO DApp》 36 七折优惠码：shijunvip Get your hands dirty and build something! 😆
- 37. Q&A
- 38. 38