# Alchemy University 学习教程，Ethereum

**Published by:** [冰糖vs橙子](https://paragraph.com/@bible666/)
**Published on:** 2023-01-02
**URL:** https://paragraph.com/@bible666/alchemy-university-ethereum

## Content

估值102亿融资5.45亿的Alchemy 项目，大学每周任务逐步开始。持有大学生早期卡的伙伴们可以开始大学生活了： 官方大佬的 lens ，可以关注下： https://lenster.xyz/u/vitto.lens 了解更多，请关注作者：https://twitter.com/bitc2024 这一期看文章的内容比较多，请各位自行查看。 Ethereum Features Transactions Game 这里需要去下载一个钱包，创建一个钱包账户（注意不要导自己的助记词，直接新创建一个），注意最好用一个新的浏览器创建，不要在常用的浏览器创建（谷歌浏览器添加一个新账户创建即可） 官方这里有教程，可以看下，比较简单，我这里就不写了。 领完水后，需要进入官方discord群里，找一个钱包地址发送一些ETH过去，同时自己也要把自己刚刚创建的ETH地址发到这个频道去，内容包含： 1.写一个关于自己的有趣的事情， 2.钱包地址。 以下是频道： Discord - Group Chat That's All Fun & Games Discord is great for playing games and chilling with friends, or even building a worldwide community. Customize your own space to talk, play, and hang out. https://discord.com 点击上面链接后进不去频道的，需要在discord添加身份： 可以借鉴别人怎么发 随便找个地址发一些ETH给他就行。 注意用上面刚创建的钱包。 发送完第一节的游戏就完成了。 Reading Data from Ethereum Activity: Query Ethereum 这块内容，主要是查看文章，不是真正做区块链的，看完就好了。 Ethereum Transactions JSON-RPC Requests 1: Current Block Number 查看要求： 输入： const provider = require('./provider'); async function getBlockNumber() { const ret = await provider.send({ jsonrpc: "2.0", id: 1, method: "eth_blockNumber", }); return ret.result; } module.exports = getBlockNumber; 点击运行。 2: Get Balance 查看要求： 输入： const provider = require('./provider'); async function getBalance(address) { const ret = await provider.send({ jsonrpc: "2.0", id: 1, method: "eth_getBalance", params: [address, "latest"], }); return ret.result; } module.exports = getBalance; 点击运行。 3: Get Nonce 查看要求： 输入： const provider = require('./provider'); async function getNonce(address) { const ret = await provider.send({ jsonrpc: "2.0", id: 1, method: "eth_getTransactionCount", params: [address, "latest"], }); return ret.result; } module.exports = getNonce; 点击运行。 4: Block Transactions 查看要求： 输入： const provider = require('./provider'); async function getTotalTransactions(blockNumber) { const ret = await provider.send({ jsonrpc: "2.0", id: 1, method: "eth_getBlockByNumber", params: [blockNumber, false], }); return ret.result.transactions.length; } module.exports = getTotalTransactions; 点击运行。 5: Total Wei 查看要求： 输入： const provider = require('./provider'); async function getTotalBalance(addresses) { let reqs = []; for (let i = 0; i < addresses.length; i++) { reqs.push({ jsonrpc: "2.0", id: 1, method: "eth_getBalance", params: [addresses[i], "latest"], }); } const resps = await provider.send(reqs); let t = 0; for (let i = 0; i < resps.length; i++) { t = t + parseInt(resps[i].result); } return t; } module.exports = getTotalBalance; 点击运行。 Front-End Libraries Intro to Ethers.js 1: Making Wallets 查看要求： 输入： const ethers = require('ethers'); const { Wallet } = ethers; // create a wallet with a private key const wallet1 = new Wallet("0xf2f48ee19680706196e2e339e5da3491186e0c4c5030670656b0e0164837257d"); // create a wallet from mnemonic const wallet2 = Wallet.fromMnemonic("plate lawn minor crouch bubble evidence palace fringe bamboo laptop dutch ice"); module.exports = { wallet1, wallet2, } 点击运行。 2: Sign a Transaction 查看要求： 输入： const ethers = require('ethers'); const { Wallet, utils } = ethers; const { wallet1 } = require('./wallets'); const signaturePromise = wallet1.signTransaction({ value: utils.parseEther('1', 'ether'), to: "0xdD0DC6FB59E100ee4fA9900c2088053bBe14DE92", gasLimit: utils.parseUnits('21000', 'wei'), }); module.exports = signaturePromise; 点击运行。 3: Connect to Ethereum 查看要求： 输入： const { Wallet, utils, providers } = require('ethers'); const { ganacheProvider, PRIVATE_KEY } = require('./config'); const provider = undefined; const wallet = new Wallet(PRIVATE_KEY); async function sendEther({ value, to }) { const rawTx = await wallet.signTransaction({ value, to, gasLimit: 0x5208, gasPrice: 0x3b9aca00 }); const provider = new providers.Web3Provider(ganacheProvider); resp = await provider.sendTransaction(rawTx); return resp; } module.exports = sendEther; 点击运行。 4: Account Nonce 查看要求： 输入： const { Wallet, utils, providers } = require('ethers'); const { ganacheProvider, PRIVATE_KEY } = require('./config'); const provider = new providers.Web3Provider(ganacheProvider); const wallet = new Wallet(PRIVATE_KEY, provider); async function sendEther({ value, to }) { return wallet.sendTransaction({ value, to }); } module.exports = sendEther; 点击运行。 5: Find Balance 查看要求： 输入： const { Wallet, providers } = require('ethers'); const { ganacheProvider } = require('./config'); const provider = new providers.Web3Provider(ganacheProvider); function findMyBalance(privateKey) { const wallet = new Wallet(privateKey, provider); return wallet.getBalance(); } module.exports = findMyBalance; 点击运行。 6: Charitable Donations 查看要求： 输入： const { utils, providers, Wallet } = require('ethers'); const { ganacheProvider } = require('./config'); const provider = new providers.Web3Provider(ganacheProvider); /** * Donate at least 1 ether from the wallet to each charity * @param {string} a hex string private key for a wallet with 10 ETH * @param {array} an array of ethereum charity addresses * * @returns {Promise} a promise that resolves after all donations have been sent */ async function donate(privateKey, charities) { const wallet = new Wallet(privateKey, provider); let resps = []; nonce = await wallet.getTransactionCount(); for (let i = 0; i < charities.length; i++) { const rawTx = await wallet.signTransaction({ value: utils.parseEther('1', 'ether'), to: charities[i], gasLimit: utils.parseUnits('21000', 'wei'), nonce: nonce + i }); resps.push(provider.sendTransaction(rawTx)); } return Promise.all(resps); } module.exports = donate; 点击运行。 Where is the Ether? 1: Where is the Ether? 查看要求： 输入： const { providers } = require('ethers'); const { ganacheProvider } = require('./config'); const provider = new providers.Web3Provider(ganacheProvider); /** * Given an ethereum address find all the addresses * that were sent ether from that address * @param {string} address - The hexidecimal address for the sender * @async * @returns {Array} all the addresses that receieved ether */ async function findEther(address) { let addrs = []; let blockNum = await provider.getBlockNumber(); for (let i = 0; i <= blockNum; i++) { let block = await provider.getBlockWithTransactions(i); block.transactions.forEach((tx) => { if (tx.from === address) { addrs.push(tx.to); } }); } return addrs; } module.exports = findEther; 点击运行。 以上，Ethereum，课程学习完成。 未完待续…… 了解更多，请关注作者：https://twitter.com/bitc2024 https://mirror.xyz/bible666.eth/X3VB59DNaNU37nTwsKOFwEUPZvEtuzbM0GJlMkK8x40

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