https://github.com/smartcontractkit/web3_tutorial_chinese

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Host: GitHub
URL: https://github.com/smartcontractkit/web3_tutorial_chinese
Owner: smartcontractkit
License: mit
Created: 2024-03-20T11:59:54.000Z (about 1 year ago)
Default Branch: main
Last Pushed: 2025-03-06T13:57:33.000Z (3 months ago)
Last Synced: 2025-04-11T21:48:55.485Z (2 months ago)
Language: Solidity
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Stars: 581
Watchers: 8
Forks: 198
Open Issues: 6
Metadata Files:
- Readme: README.md
- License: LICENSE
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README

        # Web3 教程 - Solidity，Hardhat，Token standard，Interoperability

This tutorial represents an educational example to use a Chainlink system, product, or service and is provided to demonstrate how to interact with Chainlink's systems, products, and services to integrate them into your own. This template is provided "AS IS" and "AS AVAILABLE" without warranties of any kind, it has not been audited, and it may be missing key checks or error handling to make the usage of the system, product or service more clear. Do not use the code in this example in a production environment without completing your own audits and application of best practices. Neither Chainlink Labs, the Chainlink Foundation, nor Chainlink node operators are responsible for unintended outputs that are generated due to errors in code. 

[中文](#内容介绍) | [English for review](#english-for-review)

这个 repository 是初学者课程《Web3 和区块链技术》的代码部分，并且包括课程中提到过的资料。

## 测试网水龙头(Testnet Faucets)

Chainlink 测试网水龙头：https://faucets.chain.link 


Alchemy 测试网水龙头：https://sepoliafaucet.com/ 


Infura 测试网水龙头：https://www.infura.io/faucet/sepolia

## 在哪里讨论，问题？

- [GitHub Discussion](https://github.com/smartcontractkit/Web3_tutorial_Chinese/discussions) 页面


提课程相关的问题

- [登链社区](https://learnblockchain.cn/)


提任何区块链相关的技术问题

- [StackOverflow Ethereum](https://ethereum.stackexchange.com/)


提出任何以太坊相关的技术问题（需要英文）

- [StackOverflow](https://stackoverflow.com/) 


提出任何技术问题（需要英文）

- 其他可能会用到的技术文档

    - [Solidity技术手册](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#what-are-function-modifiers)

    - [以太坊官方文档](https://ethereum.org/zh)

    - [Solidity官方文档](https://docs.soliditylang.org/zh/v0.8.20/)

    - [Chainlink官方文档](https://docs.chain.link/)

    - [Hardhat官方文档](https://hardhat.org/)

    - [ether.js官方文档](https://docs.ethers.org/v6/)

    - [openzeppelin官方文档](https://docs.openzeppelin.com/contracts/5.x/)

# 目录

 第一课：区块链基础知识 & 操作



  

   区块链简史 

  

  

   区块链的设计哲学：去中心化和共识 

  

  

   Web3：面向资产的互联网 

  

  

   智能合约简介 

  

  

   自托管钱包Metamask 

    

  

   密码学基础 & Metamask配置

    

  

   领取测试币 

    

  

   签名&发送交易 

    

  

   燃料费（gas费）介绍 

    



 第二课：Solidity基础：Hello World



  

   Remix，Solidity编译器和开源协议 

  

  

   Solidity基础数据类型 

  

  

   Solidity函数 

  

  

   Solidity存储模式：memory, storage, calldata 

  

  

   Solidity数据结构：结构体，数组和映射 

    

  

   合约间交互：工厂模式

    

  

   总结 

    



 第三课：Solidity进阶：FundMe



  

   通过函数发送ETH 

  

  

   通过预言机设定最小额度 

  

  

   通过函数提取合约中的ETH 

  

  

   修改器和时间锁 

  

  

   Token和Coin的区别 

    

  

   创建一个Token合约

    

  

   继承ERC-20合约

    

    

   部署和验证合约

    



 第四课：Hardhat基础：部署交互FundMe



  

   环境搭建：Hardhat介绍 

  

  

   环境搭建：安装node.js 

  

  

   环境搭建：安装VS Code和git 

  

  

   创建Hardhat项目 

  

  

   通过Hardhat编译和部署合约 

    

  

   Hardhat网络&其他配置

    

  

   与FundMe合约交互

    

    

   创建Hardhat自定义任务

    



 第五课：Hardhat进阶：测试FundMe



  

   Hardhat测试介绍 

  

  

   Hardhat deploy任务 

  

  

   使用mock合约 

  

  

   给FundMe写单元测试 

  

  

   gas reporter和coverage 

    



 第六课：跨链应用



  

   NFT介绍 

  

  

   NFT的metadata 

  

  

   NFT基础合约 

  

  

   Chainlink ccip 

  

  

   资产跨链池 

    

  

   chainlink-local & 单元测试

    

  

   跨链NFT的Hardhat的自定义任务

    






# 教程中用到的代码

- 第一课：无

- 第二课：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-2

- 第三课：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-3

- 第四课：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-4

- 第五课：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-5

- 第六课：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-6





# 第一课：区块链基础知识 & 操作

第一课视频教程：WIP


第一课代码：本章没有代码

## 区块链简史

- [《比特币白皮书，一种点对点的电子现金系统》](https://bitcoin.org/files/bitcoin-paper/bitcoin_zh_cn.pdf)

    - [比特币发明人 - 中本聪(Nakamoto Satoshi)](https://zh.wikipedia.org/zh-cn/%E4%B8%AD%E6%9C%AC%E8%81%AA)

    - [图灵完备是什么意思？](https://www.zhihu.com/question/20115374)

- [《以太坊白皮书》](https://github.com/ethereum/wiki/wiki/%5B%E4%B8%AD%E6%96%87%5D-%E4%BB%A5%E5%A4%AA%E5%9D%8A%E7%99%BD%E7%9A%AE%E4%B9%A6)

    - [以太坊发明人 - 维塔利克·布特林(Vitalik Buterin)](https://zh.wikipedia.org/zh-cn/%E7%B6%AD%E5%A1%94%E5%88%A9%E5%85%8B%C2%B7%E5%B8%83%E7%89%B9%E6%9E%97)

- [智能合约概念提出人 - 尼克·萨博（Nick Szabo）](https://zh.wikipedia.org/zh-cn/%E5%B0%BC%E5%85%8B%C2%B7%E8%96%A9%E5%8D%9A)

- [Nick Szabo 对于智能合约定义](https://www.fon.hum.uva.nl/rob/Courses/InformationInSpeech/CDROM/Literature/LOTwinterschool2006/szabo.best.vwh.net/smart.contracts.html)

## 区块链设计哲学：去中心化和共识

- [什么是区块链中的去中心化？](https://aws.amazon.com/cn/blockchain/decentralization-in-blockchain/)

- [共识机制](https://ethereum.org/zh/developers/docs/consensus-mechanisms)

    - [PoW工作量证明](https://ethereum.org/zh/developers/docs/consensus-mechanisms/pow)

    - [PoS权益证明](https://ethereum.org/zh/developers/docs/consensus-mechanisms/pos)

    - [女巫攻击](https://www.51cto.com/article/742890.html)

## Web3：面向资产的互联网

- [Web3介绍(详细)](https://learn.metamask.io/zh-CN/lessons/what-is-web3)

- [Web3介绍(简略)](https://ethereum.org/zh/web3#introduction)

- [什么是数据所有权](https://learn.metamask.io/zh-CN/lessons/the-advent-of-digital-ownership)

- [什么是dApp？](https://ethereum.org/zh/dapps#what-are-dapps)

## 智能合约简介

- [什么是Defi](https://ethereum.org/zh/defi)

- [什么是NFT](https://ethereum.org/zh/nft#what-are-nfts)

- [智能合约介绍](https://ethereum.org/zh/smart-contracts#introduction-to-smart-contracts)

## 自托管钱包Metamask

- [Metamask钱包简介](https://metamask.io/)

- [什么是加密钱包](https://learn.metamask.io/zh-CN/lessons/what-is-a-crypto-wallet)

- [什么是自主托管](https://learn.metamask.io/zh-CN/lessons/what-is-a-self-custody-wallet)

## 密码学基础 & Metamask配置

- [BIP-32密钥生成算法](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki)

- [BIP-39助记词列表](https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md)

- [如何将助记词转换为私钥](https://mdrza.medium.com/how-to-convert-mnemonic-12-word-to-private-key-address-wallet-bitcoin-and-ethereum-81aa9ca91a57) 

- [分层确定性钱包(HD钱包)介绍](https://help.tokenpocket.pro/cn/faq/multichain-wallet/hd)

- [Metamask 安装](https://metamask.io/download/)

    - [Chainlist 查看测试网配置](https://chainlist.org/)

- [SepoliaScan 区块链浏览器](https://sepolia.etherscan.io/)

## 领取测试币

- [Chainlink水龙头](https://faucets.chain.link/) 

- [Infura水龙头](https://www.infura.io/faucet/sepolia) 

- [Alchemy水龙头](https://sepoliafaucet.com/) 

## 签名&发送交易

- [椭圆曲线签名算法](https://blog.csdn.net/weixin_43586667/article/details/122766815)

- [签名模拟](https://andersbrownworth.com/)

## 燃料费（gas费）介绍

- [gas费介绍](https://ethereum.org/zh/developers/docs/gas)

- [EIP-1559](https://ethereum.org/zh/developers/docs/gas#what-was-the-london-upgrade-eip-1559)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第一课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# 第二课：Solidity基础：Hello World

第二课视频教程：WIP


第二课代码：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-2 

## Remix，Solidity编译器和开源协议

- [开源软件许可协议简介](https://developer.aliyun.com/article/25089)

- [EVM（以太坊虚拟机） 介绍](https://ethereum.org/zh/developers/docs/evm)

    - [EVM 版本](https://docs.soliditylang.org/en/v0.8.21/using-the-compiler.html) 

- [Solidity 编译器介绍](https://docs.soliditylang.org/zh/v0.8.16/using-the-compiler.html) 

- [Solidity 官方文档](https://docs.soliditylang.org/zh/v0.8.16/index.html) 

## Solidity 基础数据类型

- [Solidity 类型官方文档](https://docs.soliditylang.org/zh/v0.8.16/types.html#) 

- [Bytes vs bytes32](https://ethereum.stackexchange.com/questions/11770/what-is-the-difference-between-bytes-and-bytes32)

## Solidity 函数

- [智能合约结构](https://docs.soliditylang.org/zh/v0.8.17/layout-of-source-files.html)

- [如何拼接两个string变量（英文）](https://medium.com/@jamaltheatlantean/how-to-concatenate-two-strings-using-solidity-fada6051b1a6) 

## Solidity 存储模式：memory, storage, calldata

这一节知识是底层原理，不需要完全理解也可以继续学习，这部分英文文档会更加清晰。

- [EVM底层数据存储原理（英文）](https://www.netspi.com/blog/technical/blockchain-penetration-testing/ethereum-virtual-machine-internals-part-2/)

    - [storage存储方式](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_storage.html)

    - [memory存储方式](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_memory.html)

    - [calldata存储方式](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_calldata.html)

## Solidity 基础数据结构：结构体，数组，和映射

Solidity 官方文档中，关于数据和结构体，英文文档比中文文档在定义上表述更清晰。

- [数据结构 - 数组（英文）](https://docs.soliditylang.org/en/v0.8.24/types.html#arrays)

    - [数据结构 - 数组（中文对照）](https://docs.soliditylang.org/zh/v0.8.17/types.html#arrays)

- [数据结构 - 结构体（英文）](https://docs.soliditylang.org/en/v0.8.24/types.html#structs)

    - [数据结构 - 结构体（中文对照）](https://docs.soliditylang.org/zh/v0.8.17/types.html#structs)

## 合约间交互：工厂模式

- [Solidity 工厂模式介绍](https://learnblockchain.cn/article/1952)

- [如何使用工厂模式（英文）](https://betterprogramming.pub/learn-solidity-the-factory-pattern-75d11c3e7d29)

- [Solidity中的工厂模式（英文）](https://medium.com/@solidity101/demystifying-the-factory-pattern-in-solidity-efficient-contract-deployment-with-factory-pattern-e233ea6d1ec0#:~:text=Understanding%20the%20Factory%20Pattern&text=In%20the%20context%20of%20Ethereum,with%20predefined%20functionalities%20and%20structures.)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第二课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# 第三课：Solidity进阶：FundMe

第三课视频教程：WIP


第三课代码：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-3 

## 通过函数发送ETH

- [payable关键字](https://docs.alchemy.com/docs/solidity-payable-functions)

- [以太坊账户：EOA和合约账户](https://ethereum.org/zh/developers/docs/accounts#types-of-account)

- [Wei，GWei，Finney和ether](https://www.alchemy.com/gwei-calculator)

## 通过预言机设定最小额度

- [预言机(oracle)定义](https://chain.link/education/blockchain-oracles)

- [Chainlink技术文档](https://docs.chain.link/)

    - [Chainlink喂价文档](https://docs.chain.link/data-feeds)

    - [Chainlink喂价合约地址列表](https://docs.chain.link/data-feeds/price-feeds/addresses?network=ethereum&page=1)


-Solidity的数据类型没有double或者floating（小数），如果想要表示带有小数的以太币，把wei当成最小单位，它是ether的10e-18，也就是0.000000000000000001。

- [以太币面额转换器](https://eth-converter.com/)

- [以太币面额](https://ethereum.org/zh/developers/docs/intro-to-ether#denominations)

- [Solidity 中如何使用浮点数](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#how-to-work-with-floating-point-numbers-in-solidity)

## 通过函数提取合约中的ETH

- [如何发送和接受ETH](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#how-to-send-and-receive-ether)

- [三种转账方式: transfer, send, call](https://solidity-by-example.org/sending-ether/)

## 函数修饰符和时间锁

- [函数修饰符是什么](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#what-are-function-modifiers)

- [怎样开发智能合约中的时间锁](https://blog.chain.link/timelock-smart-contracts-zh/#post-title)

- [Uinx时间戳](https://www.unixtimestamp.com/)

## Token和Coin的区别

- [Token和Coin的区别](https://www.ledger.com/academy/crypto/what-is-the-difference-between-coins-and-tokens)

## 创建一个Token合约

- [Token介绍](https://docs.openzeppelin.com/contracts/5.x/tokens)

- [Solidity中的继承](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#inheritance-in-solidity)

## 继承ERC-20合约

- [ERC-20标准合约](https://docs.openzeppelin.com/contracts/5.x/erc20)

- [ERC-20标准合约代码](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol)

- [virtual和override](https://learnblockchain.cn/docs/solidity/0.6.12/contracts/inheritance.html)

## 部署和验证合约

- 注册[从区块链浏览器（Etherscan）](https://etherscan.io/)账户，并且获取API key

- [怎样通过 Etherscan 验证智能合约](https://blog.chain.link/how-to-verify-a-smart-contract-on-etherscan-zh/)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第三课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# 第四课：Hardhat基础：部署交互FundMe

第四课视频教程：WIP


第四课代码：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-4 


## 环境搭建：Hardhat介绍

- [Hardhat官网（英文）](https://hardhat.org/)

- [Hardhat，Truffle和Foundry对比（英文）](https://smartcontract.tips/articoli/truffle-hardhat-foundry-compare/)

- [Hardhat和Foundry在测试方面的对比（英文）](https://ethereum.stackexchange.com/questions/143171/hardhat-vs-foundry-which-to-use-for-testing)

## 环境搭建：安装node.js

- [如何在Windows上安装Linux](https://learn.microsoft.com/zh-cn/windows/wsl/install)

- [在MacOS安装node的5种方式](https://stackoverflow.com/questions/28017374/what-is-the-recommended-way-to-install-node-js-nvm-and-npm-on-macos-x)

- [MacOS Homebrew安装](https://brew.sh/)

- [面向初学者的 Linux Shell——解释 Bash、Zsh 和 Fish](https://www.freecodecamp.org/chinese/news/linux-shells-explained/)

- [zsh的配置文件（英文）](https://www.freecodecamp.org/news/how-do-zsh-configuration-files-work)

- [如何在MacOS上卸载node](https://macpaw.com/how-to/uninstall-node-mac)

## 环境搭建：安装VS Code和git

- [brew cask和formulae的区别（英文）](https://stackoverflow.com/questions/46403937/what-is-the-difference-between-brew-install-x-and-brew-cask-install-x)

- [git官网](https://git-scm.com/)

- [使用git和github的常见命令](https://www.freecodecamp.org/chinese/news/how-to-use-basic-git-and-github-commands/)

## 创建Hardhat项目

- [Hardhat官网：创建Hardhat项目](https://hardhat.org/tutorial/creating-a-new-hardhat-project)

- [怎样开发智能合约中的时间锁](https://blog.chain.link/timelock-smart-contracts-zh/#post-title)

- [Uinx时间戳](https://www.unixtimestamp.com/)

## 通过Hardhat编译和部署合约

- [通过Hardhat编译合约](https://hardhat.org/hardhat-runner/docs/guides/compile-contracts)

- [通过Hardhat部署合约](https://hardhat.org/hardhat-runner/docs/guides/deploying)

- [Hardhat 所使用的 ethers](https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-ethers)

- [ethersjs v6官方文档](https://docs.ethers.org/v6/getting-started/)

- [ethersjs v5到v6](https://docs.ethers.org/v6/migrating/)

## Hardhat网络&其他配置

- [Hardhat官网：暂时网络和独立网络（英文）](https://hardhat.org/hardhat-network/docs/overview)

- [dotenv介绍](https://juejin.cn/post/6844904198929121288)

- [NPM：Chainlink/env-enc介绍（英文）](https://www.npmjs.com/package/@chainlink/env-enc)

- [Alchemy注册](https://www.alchemy.com/)

## 与FundMe合约交互

- [Hardhat官网：provider（英文）](https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-ethers#provider-object)

## 创建Hardhat自定义任务

- [module.exports 介绍](https://www.freecodecamp.org/chinese/news/module-exports-how-to-export-in-node-js-and-javascript)

- [Hardhat官网：创建任务（英文）](https://hardhat.org/hardhat-runner/docs/advanced/create-task)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第四课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# 第五课：Hardhat进阶：测试FundMe

第五课视频教程：WIP


第五课代码：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-5 


## Hardhat 测试介绍

- [智能合约测试](https://ethereum.org/zh/developers/docs/smart-contracts/testing/)

- [Hardhat test官方文档](https://hardhat.org/tutorial/testing-contracts)

- [mocha官网](https://mochajs.org/)

- [chai官网](https://www.chaijs.com/)

## Hardhat deploy

- [Hardhat Deploy官方文档](https://hardhat.org/hardhat-runner/docs/guides/deploying)

- [Hadhat Deploy插件](https://www.npmjs.com/package/hardhat-deploy)

## 使用mock合约

- [什么是mock合约](https://ethereum.org/zh/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)

- [Chainlink喂价Mock合约](https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/tests/MockV3Aggregator.sol)

## 给FundMe写单元&集成测试

- [什么是单元测试](https://aws.amazon.com/cn/what-is/unit-testing/)

- [javascript测试框架Mocha](https://mochajs.org/)

- [javascript测试框架Chai](https://www.chaijs.com/)

## gas reporter和coverage

- [Hardhat gas reporter](https://www.npmjs.com/package/hardhat-gas-reporter)

- [Solidity coverage](https://www.npmjs.com/package/solidity-coverage)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第五课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# 第六课：跨链应用

第六课视频教程：WIP


第六课代码：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-6 


## NFT介绍

- [NFT非同质代币是什么](https://ethereum.org/zh/nft/#what-are-nfts)

- [NFT有哪些用户案例](https://chain.link/education/nfts)

- [动态NFT是什么](https://chain.link/education-hub/what-is-dynamic-nft)

## NFT的metadata

- [NFT metadata(Opensea标准)](https://docs.opensea.io/docs/metadata-standards)

## ERC721基础合约

- [Openzeppelin合约 wizard](https://www.openzeppelin.com/contracts)

- [ERC721(OpenZeppelin)](https://docs.openzeppelin.com/contracts/3.x/erc721)

- [ERC1155(OpenZeppelin)](https://docs.openzeppelin.com/contracts/3.x/erc1155)

- [ERC721 vs ERC1155](https://www.alchemy.com/blog/comparing-erc-721-to-erc-1155)

## Chainlink CCIP (跨链互操作协议)

- [什么是链间互操作性](https://chain.link/education-hub/blockchain-interoperability)

- [Chainlink CCIP官方文档](https://docs.chain.link/ccip)

- [跨链桥的7个风险](https://blog.chain.link/cross-chain-bridge-vulnerabilities/)

- [使用CCIP的5个例子](https://blog.chain.link/how-to-use-ccip/)

- [区块状态](https://www.alchemy.com/overviews/ethereum-commitment-levels)

- [跨链桥的5种安全等级](https://blog.chain.link/five-levels-cross-chain-security/)

## 跨链资产池

- [NFT池子样例合约](https://github.com/QingyangKong/Web3_tutorial_lesson6/blob/1-chainlink-local/contracts/NFTPoolLockAndRelease.sol)

- [什么是封装加密资产](https://www.kraken.com/learn/what-are-wrapped-crypto-assets)

## Chainlink-local 和单元测试

- [chainlink local](https://github.com/smartcontractkit/chainlink-local/tree/main)

## 跨链NFT的hardhat自定义任务

- [hardhat-deploy companion网络](https://github.com/wighawag/hardhat-deploy?tab=readme-ov-file#companionnetworks)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


恭喜完成第六课的学习！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


这个 repository 是初学者课程《Web3 和区块链技术》的代码部分，并且包括课程中提到过的资料。

# English for review

## Testnet Faucets

Chainlink testnet faucets：https://faucets.chain.link 


Alchemy testnet faucets：https://sepoliafaucet.com/ 


Infura testnet faucets：https://www.infura.io/faucet/sepolia

## Where to discuss？

- [GitHub Discussion](https://github.com/smartcontractkit/Web3_tutorial_Chinese/discussions) page


Ask questions related to the course

- [Learnblockchain.cn](https://learnblockchain.cn/)


Ask any question related to Web3 and blockchain

- [StackOverflow Ethereum](https://ethereum.stackexchange.com/)


Ask any question about Ethereum

- [StackOverflow](https://stackoverflow.com/) 


Ask any question about programming

- Other technical documents that might be used

    - [Solidity Handbook](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#what-are-function-modifiers)

    - [Ethereum Official Documentation](https://ethereum.org/zh)

    - [Solidity Official Documentation](https://docs.soliditylang.org/zh/v0.8.20/)

    - [Chainlink Official Documentation](https://docs.chain.link/)

    - [Hardhat Official Documentation](https://hardhat.org/)

    - [ether.js Official Documentation](https://docs.ethers.org/v6/)

    - [openzeppelin Official Documentation](https://docs.openzeppelin.com/contracts/5.x/)

# 目录

 Lesson 1: blockchain basics



  

   What is blockchain? 

  

  

   Philosophy of blockchain: Trust-minimization 

  

  

   Web3: decentralized internet for asset 

  

  

   Introduction for smart contracts 

  

  

   Self Custody wallet & metamask 

    

  

   Crypto basics & metamask setup

    

  

   Claim test tokens on Sepolia testnet 

    

  

   Sign a transaction 

    

  

   Intro to gas 

    



 Solidity Basics: Hello World



  

   Remix & compiler version & license 

  

  

   Solidity: basic data types 

  

  

   Solidity: function 

  

  

   Storage & memory & calldata 

  

  

   Solidity: basic data structure 

    

  

   HelloWorld factory: interact with other contracts

    



 Lesson 3: Solidity Advanced: FundMe & ERC20



  

   Payable function: send ETH to a contract 

  

  

   Set the minimum for USD with Chainlink Data feed 

  

  

   Transfer token using function 

  

  

   Modifer and timelock 

  

  

   Coin vs token 

    

  

   Create a token contract 

    

  

   ERC-20 token standard 

    

    

   Deployment & verification

    



 Lesson 4: hardhat FundMe



  

   env setup: Introduction to Hardhat 

  

  

   env setup: Install nodejs 

  

  

   env setup: Install vscode & git 

  

  

   Create hardhat project 

  

  

   Compile and deploy the contract through Hardhat 

    

  

   Hardhat network & other configurations

    

  

   Interact with FundMe

    

    

   create custom hardhat task

    



 Lesson 5: Test FundMe



  

   Introduction to the unit tests in Hardhat 

  

  

   Hardhat deploy task 

  

  

   mock contract 

  

  

   write unit test for FundMe 

  

  

   gas Reporter & coverage  

    



 Lesson 6: cross-chain application



  

   Introduction for NFT 

  

  

   NFT metadata 

  

  

   ERC-721 token standard 

  

  

   Chainlink ccip 

  

  

   Token pool for ccip 

    

  

   chainlink-local & unit test

    

  

   Hardhat custom task cross-chain nft

    






# Codes used in the course

- Lesson 1: NA

- Lesson 2: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-2

- Lesson 3: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-3

- Lesson 4: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-4

- Lesson 5: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-5

- Lesson 6: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-6





# Lesson1: blockchain basics

Video of lesson 1：WIP


Codes of lesseon 1：NA

## What is blockchain

- [Bitcoin whitepaper, A Peer-to-Peer Electronic Cash System](https://bitcoin.org/files/bitcoin-paper/bitcoin_zh_cn.pdf)

    - [Nakamoto Satoshi](https://zh.wikipedia.org/zh-cn/%E4%B8%AD%E6%9C%AC%E8%81%AA)

    - [What is Turing completeness?](https://www.zhihu.com/question/20115374)

- [Ethereum Whitepaper](https://github.com/ethereum/wiki/wiki/%5B%E4%B8%AD%E6%96%87%5D-%E4%BB%A5%E5%A4%AA%E5%9D%8A%E7%99%BD%E7%9A%AE%E4%B9%A6)

    - [Vitalik Buterin](https://zh.wikipedia.org/zh-cn/%E7%B6%AD%E5%A1%94%E5%88%A9%E5%85%8B%C2%B7%E5%B8%83%E7%89%B9%E6%9E%97)

- [Inventor of smart contract - Nick Szabo](https://zh.wikipedia.org/zh-cn/%E5%B0%BC%E5%85%8B%C2%B7%E8%96%A9%E5%8D%9A)

- [How Nick Szabo describes smart contract](https://www.fon.hum.uva.nl/rob/Courses/InformationInSpeech/CDROM/Literature/LOTwinterschool2006/szabo.best.vwh.net/smart.contracts.html)

## Philosophy of blockchain: Trust-minimization

- [What is decentralization in blockchain?](https://aws.amazon.com/cn/blockchain/decentralization-in-blockchain/)

- [Consensus](https://ethereum.org/zh/developers/docs/consensus-mechanisms)

    - [Proof of work](https://ethereum.org/zh/developers/docs/consensus-mechanisms/pow)

    - [Proof of stake](https://ethereum.org/zh/developers/docs/consensus-mechanisms/pos)

    - [Sybil attack](https://www.51cto.com/article/742890.html)

## Web3: decentralized internet for asset

- [Web3 introduction](https://learn.metamask.io/zh-CN/lessons/what-is-web3)

- [Web3 introduction(Brief)](https://ethereum.org/zh/web3#introduction)

- [What is digital ownership?](https://learn.metamask.io/zh-CN/lessons/the-advent-of-digital-ownership)

- [What is dApp?](https://ethereum.org/zh/dapps#what-are-dapps)

## Introduction for smart contracts

- [What is Defi](https://ethereum.org/zh/defi)

- [What is NFT](https://ethereum.org/zh/nft#what-are-nfts)

- [Introduction to smart contract](https://ethereum.org/zh/smart-contracts#introduction-to-smart-contracts)

## Self Custody wallet & metamask

- [Metamask wallet introduction](https://metamask.io/)

- [What is a crypto wallet?](https://learn.metamask.io/zh-CN/lessons/what-is-a-crypto-wallet)

- [What is a self custody wallet?](https://learn.metamask.io/zh-CN/lessons/what-is-a-self-custody-wallet)

## Crypto basics & metamask setup

- [BIP-32 key generation algorithm](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki)

- [BIP-39 wordlist](https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md)

- [How to convert mnemonics to private key](https://mdrza.medium.com/how-to-convert-mnemonic-12-word-to-private-key-address-wallet-bitcoin-and-ethereum-81aa9ca91a57) 

- [Introduction to hierachical deterministic(HD) wallet](https://help.tokenpocket.pro/cn/faq/multichain-wallet/hd)

- [Metamask installation](https://metamask.io/download/)

    - [Chainlist](https://chainlist.org/)

- [SepoliaScan blockchain explorer](https://sepolia.etherscan.io/)

## Claim test tokens on Sepolia testnet

- [Chainlink faucets](https://faucets.chain.link/) 

- [Infura faucets](https://www.infura.io/faucet/sepolia) 

- [Alchemy facuvets](https://sepoliafaucet.com/) 

## Sign a transaction

- [elliptic curve cryptography](https://blog.csdn.net/weixin_43586667/article/details/122766815)

- [Signature Demo](https://andersbrownworth.com/)

## Intro to gas fee

- [Introduction to gas fee](https://ethereum.org/zh/developers/docs/gas)

- [EIP-1559](https://ethereum.org/zh/developers/docs/gas#what-was-the-london-upgrade-eip-1559)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 1！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# Lesson 2: Solidity Basics: Hello World

Video of lesson 2: WIP


Codes of lesson 2: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-2 

## Remix & compiler version & license

- [Introduction to Open Source Software Licenses](https://developer.aliyun.com/article/25089)

- [Introduction to EVM(Ethereum Virtual Machine)](https://ethereum.org/zh/developers/docs/evm)

    - [EVM versions](https://docs.soliditylang.org/en/v0.8.21/using-the-compiler.html) 

- [Introduction to Solidity compilers](https://docs.soliditylang.org/zh/v0.8.16/using-the-compiler.html) 

- [Solidity official documentation](https://docs.soliditylang.org/zh/v0.8.16/index.html) 

## Solidity: basic data types

- [Solidity types](https://docs.soliditylang.org/zh/v0.8.16/types.html#) 

- [Bytes vs bytes32](https://ethereum.stackexchange.com/questions/11770/what-is-the-difference-between-bytes-and-bytes32)

## Solidity: function

- [Smart contract layout](https://docs.soliditylang.org/zh/v0.8.17/layout-of-source-files.html)

- [How to concatenate 2 strings in solidity](https://medium.com/@jamaltheatlantean/how-to-concatenate-two-strings-using-solidity-fada6051b1a6) 

## Storage & memory & calldata

- [EVM internals](https://www.netspi.com/blog/technical/blockchain-penetration-testing/ethereum-virtual-machine-internals-part-2/)

    - [layout in storage](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_storage.html)

    - [layout in memory](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_memory.html)

    - [layout in calldata](https://docs.soliditylang.org/en/v0.8.24/internals/layout_in_calldata.html)

## Solidity: basic data structure

- [Data structure - Array](https://docs.soliditylang.org/en/v0.8.24/types.html#arrays)

    - [Data structure - Array(Chinese)](https://docs.soliditylang.org/zh/v0.8.17/types.html#arrays)

- [Data structure - Struct](https://docs.soliditylang.org/en/v0.8.24/types.html#structs)

    - [Data structure - Struct(Chinese)](https://docs.soliditylang.org/zh/v0.8.17/types.html#structs)

## HelloWorld factory: interact with other contracts

- [Learn factory pattern](https://betterprogramming.pub/learn-solidity-the-factory-pattern-75d11c3e7d29)

- [Factory pattern in solidity](https://medium.com/@solidity101/demystifying-the-factory-pattern-in-solidity-efficient-contract-deployment-with-factory-pattern-e233ea6d1ec0#:~:text=Understanding%20the%20Factory%20Pattern&text=In%20the%20context%20of%20Ethereum,with%20predefined%20functionalities%20and%20structures.)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 2！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# Lesson 3: Solidity Advanced: FundMe & ERC20

Video of lesson 3: WIP


Codes of lesson 3：https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-3 


## Payable function: send ETH to a contract

- [Ethereum account: EOA and smart contract](https://ethereum.org/zh/developers/docs/accounts#types-of-account)

## Set the minimum for USD with Chainlink Data feed

- [Oracle Definition](https://chain.link/education/blockchain-oracles)

- [Chainlink documentation](https://docs.chain.link/)

    - [Chainlink data feed doc](https://docs.chain.link/data-feeds)

    - [Chainlink data feed addresses](https://docs.chain.link/data-feeds/price-feeds/addresses?network=ethereum&page=1)

- [ETH unit converter](https://eth-converter.com/)

- [ETH denominations](https://ethereum.org/zh/developers/docs/intro-to-ether#denominations)

- [How to work with floating point numbers in solidity](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#how-to-work-with-floating-point-numbers-in-solidity)

## Transfer token using function

- [How to send and receive ETH](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#how-to-send-and-receive-ether)

- [2 ways to transer ETH: transfer, send, call](https://solidity-by-example.org/sending-ether/)

## Modifier and timelock

- [What is function modifier?](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#what-are-function-modifiers)

- [How to develop timelock in smart contract](https://blog.chain.link/timelock-smart-contracts-zh/#post-title)

- [Uinx timestamp](https://www.unixtimestamp.com/)

## Token vs Coin

- [Difference between Token and Coin](https://www.ledger.com/academy/crypto/what-is-the-difference-between-coins-and-tokens)

## Create a token contract

- [Token introduction](https://docs.openzeppelin.com/contracts/5.x/tokens)

- [Inheritance in solidity](https://www.freecodecamp.org/chinese/news/learn-solidity-handbook/#inheritance-in-solidity)

## ERC-20 token standard

- [ERC-20 token stadard](https://docs.openzeppelin.com/contracts/5.x/erc20)

## Deployment & verification

- Register [Etherscan](https://etherscan.io/) and get a API key

- [How to verify a smart contract on Etherscan](https://blog.chain.link/how-to-verify-a-smart-contract-on-etherscan-zh/)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 3！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# Lesson 4: hardhat FundMe

Video of lesson 4: WIP


Codes of lesson 4: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-4 


## env setup: Introduction to Hardhat

- [Hardhat official](https://hardhat.org/)

- [Hardhat, Truffle and Foundry](https://smartcontract.tips/articoli/truffle-hardhat-foundry-compare/)

- [Hardhat vs Foundry, which to use for testing](https://ethereum.stackexchange.com/questions/143171/hardhat-vs-foundry-which-to-use-for-testing)

## env setup: Install nodejs

- [How to install Linux on Windows](https://learn.microsoft.com/zh-cn/windows/wsl/install)

- [5 ways to install node on MacOS](https://stackoverflow.com/questions/28017374/what-is-the-recommended-way-to-install-node-js-nvm-and-npm-on-macos-x)

- [MacOS Homebrew](https://brew.sh/)

- [Linux Shell for beginners- Bash, Zsh and Fish](https://www.freecodecamp.org/chinese/news/linux-shells-explained/)

- [zsh configuration](https://www.freecodecamp.org/news/how-do-zsh-configuration-files-work)

- [uninstall node on MacOS](https://macpaw.com/how-to/uninstall-node-mac)

## env setup: Install vscode & git

- [brew cask vs formulae](https://stackoverflow.com/questions/46403937/what-is-the-difference-between-brew-install-x-and-brew-cask-install-x)

- [git official](https://git-scm.com/)

- [basic git and github commands](https://www.freecodecamp.org/chinese/news/how-to-use-basic-git-and-github-commands/)

## Create hardhat project

- [Create a new Hardhat project](https://hardhat.org/tutorial/creating-a-new-hardhat-project)

- [timelock smart contract](https://blog.chain.link/timelock-smart-contracts-zh/#post-title)

- [Uinx timestamp](https://www.unixtimestamp.com/)

## Compile and deploy the contract through Hardhat

- [Compile contract in Hardhat](https://hardhat.org/hardhat-runner/docs/guides/compile-contracts)

- [Deploy contract in Hardhat](https://hardhat.org/hardhat-runner/docs/guides/deploying)

- [Hardhat ethers](https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-ethers)

- [ethersjs v6 official documentation](https://docs.ethers.org/v6/getting-started/)

- [ethersjs migrate v5 to v6](https://docs.ethers.org/v6/migrating/)

## Hardhat network & other configurations

- [transient and standalone network](https://hardhat.org/hardhat-network/docs/overview)

- [dotenv intro](https://juejin.cn/post/6844904198929121288)

- [NPM: Chainlink/env-enc](https://www.npmjs.com/package/@chainlink/env-enc)

- [Alchemy](https://www.alchemy.com/)

## Interact with FundMe

- [provider](https://hardhat.org/hardhat-runner/plugins/nomicfoundation-hardhat-ethers#provider-object)

## create custom hardhat task

- [intro to module.exports](https://www.freecodecamp.org/chinese/news/module-exports-how-to-export-in-node-js-and-javascript)

- [Create a task in Hardhat](https://hardhat.org/hardhat-runner/docs/advanced/create-task)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 4！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# Lesson 5: Test FundMe

Video of lesson 5：WIP


Codes of lesson 5: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-5 


## Introduction to the unit tests in Hardhat

- [testing for smart contract](https://ethereum.org/zh/developers/docs/smart-contracts/testing/)

- [Hardhat test](https://hardhat.org/tutorial/testing-contracts)

## Hardhat deploy task

- [Hardhat Deploy](https://hardhat.org/hardhat-runner/docs/guides/deploying)

- [Hadhat Deploy plugin](https://www.npmjs.com/package/hardhat-deploy)

## mock contract

- [What is mock contract](https://ethereum.org/zh/developers/tutorials/how-to-mock-solidity-contracts-for-testing/)

- [Chainlink data feed mock contract](https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.6/tests/MockV3Aggregator.sol)

## write unit test for FundMe

- [What is unit test](https://aws.amazon.com/cn/what-is/unit-testing/)

- [javascript Mocha](https://mochajs.org/)

- [javascript Chai](https://www.chaijs.com/)

## gas Reporter & coverage 

- [Hardhat gas reporter](https://www.npmjs.com/package/hardhat-gas-reporter)

- [Solidity coverage](https://www.npmjs.com/package/solidity-coverage)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 5！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


# Lesson 6: cross-chain application

Video of lesson 6: WIP


Codes of lesson 6: https://github.com/smartcontractkit/Web3_tutorial_Chinese/tree/main/lesson-6 


## Introduction for NFT

- [What are NFTs](https://ethereum.org/zh/nft/#what-are-nfts)

- [NFT use cases](https://chain.link/education/nfts)

- [What is dynamic NFT](https://chain.link/education-hub/what-is-dynamic-nft)

## NFT metadata

- [NFT metadata(Opensea)](https://docs.opensea.io/docs/metadata-standards)

## ERC-721 token standard

- [Openzeppelin wizard](https://www.openzeppelin.com/contracts)

- [ERC721(OpenZeppelin)](https://docs.openzeppelin.com/contracts/3.x/erc721)

- [ERC1155(OpenZeppelin)](https://docs.openzeppelin.com/contracts/3.x/erc1155)

- [ERC721 vs ERC1155](https://www.alchemy.com/blog/comparing-erc-721-to-erc-1155)

## Chainlink CCIP (Cross-chain Interoperability Protocol)

- [What is blockchain interoperability](https://chain.link/education-hub/blockchain-interoperability)

- [Chainlink CCIP official document](https://docs.chain.link/ccip)

- [Cross chain bridge vilnerabilities](https://blog.chain.link/cross-chain-bridge-vulnerabilities/)

- [CCIP use cases](https://blog.chain.link/how-to-use-ccip/)

- [ethereum commitment levels](https://www.alchemy.com/overviews/ethereum-commitment-levels)

- [The Five Levels of Cross-Chain Security](https://blog.chain.link/five-levels-cross-chain-security/)

## Token pool in CCIP

- [NFT pool smart conrtact](https://github.com/smartcontractkit/Web3_tutorial_Chinese/blob/main/lesson-6/contracts/NFTPoolLockAndRelease.sol)

- [What is wrapped asset](https://www.kraken.com/learn/what-are-wrapped-crypto-assets)

## Chainlink-local & unit test

- [chainlink local](https://github.com/smartcontractkit/chainlink-local/tree/main)

## hardhat custom task for cross-chain NFT

- [hardhat-deploy companion网络](https://github.com/wighawag/hardhat-deploy?tab=readme-ov-file#companionnetworks)


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:


Congratulations! You complete the lesson 6！


:tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada::tada:
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