# 百亿项目Alchemy Road to Web3 第二周NFT获取教程

**Published by:** [boboge.eth](https://paragraph.com/@boboge/)
**Published on:** 2022-08-19
**URL:** https://paragraph.com/@boboge/alchemy-road-to-web3-nft

## Content

Alchemy是什么项目？ 2019年12月，Alchemy完成1500万美元A轮融资，资方为Pantera Capital，斯坦福大学，Coinbase，三星等。 2021年4月，Alchemy以5.05亿美元估值完成8000万美元B轮融资，Coatue和Addition领投，DFJ Growth、K5 Global、Chainsmokers（烟鬼组合）、演员Jared Leto和Glazer家族参投。 2021年10月，Alchemy以35亿美元估值完成2.5亿美元C轮融资，由a16z领投的。 2022年2月，Alchemy以102亿美元估值完成2亿美元融资，Lightspeed与Silver Lake领投。 Alchemy是一个背景强大、经费充足、踏实做事、没有发币的团队，这样的项目不刷，难道去刷土狗吗？ 并且，Alchemy计划将新资金用于推广Web3采用，这方面的一些举措包括推出Web3 University，就是现在的 Road to Web3 活动，活动为期10周，每周一个NFT。看了下nft数量极少，估计由于任务难度大，很多小伙伴直接放弃，这样的项目若是空投，绝对是大毛。 手把手第二周教程开始：如何构建“给我买杯咖啡”的 DeFi dapp 官方原版教程链接，其中有长达1小时30分钟的视频教程还有大篇幅的文字教程，并且有错误。我按照我的做法给大家一个易于操作的图文教程。 step1 安装环境 1.2022最新Nodejs下载安装配置步骤（保姆级教程） 先按照上述教程安装Nodejs，共分为5步，前3步做完就正常了，我没有做第4和第5步，不放心可以做一下。最新版本号如下： 2.VScode安装教程（超详细版） 再按照这个教程安装VScode。 step2 对 BuyMeACoffee.sol 智能合约进行编码 1.按win+R调出命令框，输入cmd，进入控制台。 2.输入mkdir BuyMeACoffee-contracts按回车创建文件夹，再输入cd BuyMeACoffee-contracts 按回车进入该文件夹。 3.输入npm init -y 开始新项目。 4.输入npx hardhat创建示例项目。 5.之后连按三下回车，出现下图。 6.按照提示输入下面代码，坐等安装完毕。出现警告不管。 npm install --save-dev "hardhat@^2.10.1" "@nomicfoundation/hardhat-toolbox@^1.0.1" 7.打开vscode，点击file，点击open folder。 8.找到刚才创建的BuyMeACoffee-contracts文件夹，点击选择文件夹。 9.打开后如图所示。 10.右键rename将合约文件lock.sol重命名为 BuyMeACoffee.sol 11.BuyMeACoffee.sol代码替换成下面的并保存！（不保存没用啊，要点保存） //SPDX-License-Identifier: Unlicense // contracts/BuyMeACoffee.sol pragma solidity ^0.8.0; // Switch this to your own contract address once deployed, for bookkeeping! // Example Contract Address on Goerli: 0xDBa03676a2fBb6711CB652beF5B7416A53c1421D contract BuyMeACoffee { // Event to emit when a Memo is created. event NewMemo( address indexed from, uint256 timestamp, string name, string message ); // Memo struct. struct Memo { address from; uint256 timestamp; string name; string message; } // Address of contract deployer. Marked payable so that // we can withdraw to this address later. address payable owner; // List of all memos received from coffee purchases. Memo[] memos; constructor() { // Store the address of the deployer as a payable address. // When we withdraw funds, we'll withdraw here. owner = payable(msg.sender); } /** * @dev fetches all stored memos */ function getMemos() public view returns (Memo[] memory) { return memos; } /** * @dev buy a coffee for owner (sends an ETH tip and leaves a memo) * @param _name name of the coffee purchaser * @param _message a nice message from the purchaser */ function buyCoffee(string memory _name, string memory _message) public payable { // Must accept more than 0 ETH for a coffee. require(msg.value > 0, "can't buy coffee for free!"); // Add the memo to storage! memos.push(Memo( msg.sender, block.timestamp, _name, _message )); // Emit a NewMemo event with details about the memo. emit NewMemo( msg.sender, block.timestamp, _name, _message ); } /** * @dev send the entire balance stored in this contract to the owner */ function withdrawTips() public { require(owner.send(address(this).balance)); } } step3 创建一个 buy-coffee.js 脚本来测试你的合约 1.将deploy.js重命名为buy-coffee.js 并将代码替换成下面的：（不保存没用啊，要点保存） const hre = require("hardhat"); // Returns the Ether balance of a given address. async function getBalance(address) { const balanceBigInt = await hre.ethers.provider.getBalance(address); return hre.ethers.utils.formatEther(balanceBigInt); } // Logs the Ether balances for a list of addresses. async function printBalances(addresses) { let idx = 0; for (const address of addresses) { console.log(`Address ${idx} balance: `, await getBalance(address)); idx ++; } } // Logs the memos stored on-chain from coffee purchases. async function printMemos(memos) { for (const memo of memos) { const timestamp = memo.timestamp; const tipper = memo.name; const tipperAddress = memo.from; const message = memo.message; console.log(`At ${timestamp}, ${tipper} (${tipperAddress}) said: "${message}"`); } } async function main() { // Get the example accounts we'll be working with. const [owner, tipper, tipper2, tipper3] = await hre.ethers.getSigners(); // We get the contract to deploy. const BuyMeACoffee = await hre.ethers.getContractFactory("BuyMeACoffee"); const buyMeACoffee = await BuyMeACoffee.deploy(); // Deploy the contract. await buyMeACoffee.deployed(); console.log("BuyMeACoffee deployed to:", buyMeACoffee.address); // Check balances before the coffee purchase. const addresses = [owner.address, tipper.address, buyMeACoffee.address]; console.log("== start =="); await printBalances(addresses); // Buy the owner a few coffees. const tip = {value: hre.ethers.utils.parseEther("1")}; await buyMeACoffee.connect(tipper).buyCoffee("Carolina", "You're the best!", tip); await buyMeACoffee.connect(tipper2).buyCoffee("Vitto", "Amazing teacher", tip); await buyMeACoffee.connect(tipper3).buyCoffee("Kay", "I love my Proof of Knowledge", tip); // Check balances after the coffee purchase. console.log("== bought coffee =="); await printBalances(addresses); // Withdraw. await buyMeACoffee.connect(owner).withdrawTips(); // Check balances after withdrawal. console.log("== withdrawTips =="); await printBalances(addresses); // Check out the memos. console.log("== memos =="); const memos = await buyMeACoffee.getMemos(); printMemos(memos); } // We recommend this pattern to be able to use async/await everywhere // and properly handle errors. main() .then(() => process.exit(0)) .catch((error) => { console.error(error); process.exit(1); }); 如果你粘贴的是官网的，记得把第五行那个位置换成ethers！！！（如下图所示） 2.在控制台输入npx hardhat run scripts/buy-coffee.js，出现下图就对了。 step4 使用 Alchemy 和 MetaMask 将您的 BuyMeACoffe.sol 智能合约部署到以太坊 Goerli 测试网 1.右键点击scipts，点击new file，创建一个名为deploy.js的文件。 2.在deploy.js中粘贴以下代码。（不保存没用啊，要点保存） // scripts/deploy.js const hre = require("hardhat"); async function main() { // We get the contract to deploy. const BuyMeACoffee = await hre.ethers.getContractFactory("BuyMeACoffee"); const buyMeACoffee = await BuyMeACoffee.deploy(); await buyMeACoffee.deployed(); console.log("BuyMeACoffee deployed to:", buyMeACoffee.address); } // We recommend this pattern to be able to use async/await everywhere // and properly handle errors. main() .then(() => process.exit(0)) .catch((error) => { console.error(error); process.exit(1); }); 3.在控制台输入npx hardhat run scripts/deploy.js ，并按回车，出现下面那句BuyMeACoffee deployed to: 0x5FbDB2315678afecb367f032d93F642f64180aa3就对了。 4.打开你的 hardhat.config.js文件，您将看到一些示例部署代码。 删除它并将此版本粘贴到其中。记得保存。 // hardhat.config.js require("@nomiclabs/hardhat-ethers"); require("@nomiclabs/hardhat-waffle"); require("dotenv").config() // You need to export an object to set up your config // Go to https://hardhat.org/config/ to learn more const GOERLI_URL = process.env.GOERLI_URL; const PRIVATE_KEY = process.env.PRIVATE_KEY; /** * @type import('hardhat/config').HardhatUserConfig */ module.exports = { solidity: "0.8.4", networks: { goerli: { url: GOERLI_URL, accounts: [PRIVATE_KEY] } } }; 5.在控制台输入npm install dotenv，安装dotenv。如图所示。 6.在控制台输入echo test>.env 创建一个.env文件 在这里可以看到。 7.将以下代码粘贴进.env GOERLI_URL=https://eth-goerli.alchemyapi.io/v2/<your api key> GOERLI_API_KEY=<your api key> PRIVATE_KEY=<your metamask api key> 注意：第7步的这三行代码不是最终的，三行全部要换成自己对应的链接，在哪里找，往下看。 8.替换GOERLI_URL。 注册一个 Alchemy帐户。进入dashboard，点击create app。 然后如下设置，点击create app。 点击view key 复制HTTPS的框内内容，切换到vscode，粘贴到如下位置。 9.替换GOERLI_API_KEY。 将API KEY框内内容复制，然后切换到vscode粘贴到如下位置。 10.替换PRIVATE_KEY。 点击metamask右上角三个点，然后点击账户详情。 点击导出私钥。 将下图内容复制。 粘贴到这里，然后保存。 11.访问 https://www.goerlifaucet.com 并使用您的 Alchemy 帐户登录以获得一些免费的测试以太币。 12.运行部署脚本npx hardhat run scripts/deploy.js --network goerli ，发现报错，把缺的这个装上去就好了，见13步。 13.直接输入npm install --save-dev @nomiclabs/hardhat-waffle 安装第11步的缺的包。安装时有一堆warn不需要管。 14.再运行npx hardhat run scripts/deploy.js --network goerli ，出现下面那行BuyMeACoffee deployed to: 某个地址（这个地址记得复制粘贴下来）就对了。 step5 实施一个withdraw脚本 1.右键点击script创建withdraw.js文件，将下列代码粘贴进去。 // scripts/withdraw.js const hre = require("hardhat"); const abi = require("../artifacts/contracts/BuyMeACoffee.sol/BuyMeACoffee.json"); async function getBalance(provider, address) { const balanceBigInt = await provider.getBalance(address); return hre.ethers.utils.formatEther(balanceBigInt); } async function main() { // Get the contract that has been deployed to Goerli. const contractAddress="0xDBa03676a2fBb6711CB652beF5B7416A53c1421D"; const contractABI = abi.abi; // Get the node connection and wallet connection. const provider = new hre.ethers.providers.AlchemyProvider("goerli", process.env.GOERLI_API_KEY); // Ensure that signer is the SAME address as the original contract deployer, // or else this script will fail with an error. const signer = new hre.ethers.Wallet(process.env.PRIVATE_KEY, provider); // Instantiate connected contract. const buyMeACoffee = new hre.ethers.Contract(contractAddress, contractABI, signer); // Check starting balances. console.log("current balance of owner: ", await getBalance(provider, signer.address), "ETH"); const contractBalance = await getBalance(provider, buyMeACoffee.address); console.log("current balance of contract: ", await getBalance(provider, buyMeACoffee.address), "ETH"); // Withdraw funds if there are funds to withdraw. if (contractBalance !== "0.0") { console.log("withdrawing funds..") const withdrawTxn = await buyMeACoffee.withdrawTips(); await withdrawTxn.wait(); } else { console.log("no funds to withdraw!"); } // Check ending balance. console.log("current balance of owner: ", await getBalance(provider, signer.address), "ETH"); } // We recommend this pattern to be able to use async/await everywhere // and properly handle errors. main() .then(() => process.exit(0)) .catch((error) => { console.error(error); process.exit(1); }); 如图所示，记得保存。 2.在控制台输入npx hardhat run scripts/withdraw.js ,运行后如下图就行。 step6 使用 Replit 和 Ethers.js 构建前端 Buy Me A Coffee 网站 dapp 1.在此处访问官方示例项目，并创建您自己的副本以进行修改： 官方示例项目 2.点击fork repl。 3.进入该界面，没用过replit的要注册一下。 4.下面那一串合约地址换成你在step4 的第14步得到的BuyMeACoffee deployed to:冒号后面的地址。 5.在 pages/index.js 中按ctrl+f将名称字符串更新为您自己的名称。 6.点击run，出现如图所示即可。 7.点击publish。 8.一直点下一步，最后publish即可。 这张图链接记得保存 9.进入自己创建的网站试着几笔打赏就可以了。 step7 项目提交。 提交链接。 注意，最后一步提交内容为 step4 第14步的地址; step6第8步最后一张图的链接； 你自己的replit主页链接。 step8 领取NFT。 领取链接。

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