Bunch of code snippets solving most common problems every Web3 developer needs. - cc: msokola ethereum blockchain
Once you have it we are good to go.One of the most important features of every wallet is ability to sign messages. It will be very important to us since we can use this signed message to authenticate users. How come? If user was able to sign message with their wallet - we can assume the own it it, and can execute transactions from it. It is a very common approach in the Web3 development.useEthers, and we extract from it the library property . It will allow us to interact with user's wallet.
// file: pages/Home.tsx import { useEthers } from '@usedapp/core' import type { NextPage } from 'next' const Home: NextPage==> { const { library }=useEthers const signMessage=async => { const signer=library?.getSigner const signature=await signer?.signMessage alert } return } export default HomeWhen the message has been signed we can send it to somebody along with the wallet address, and signature, so they can confirm if message was actually signed by given wallet.
Developers usually prepare API endpoints to verify those sort of messages and record them in databases for legal reasons. Let's assume we want to verify the signed message on our own. How we can do this?. You can do this by running the following command in your terminal:from this package and pass the message and signature to it. It will return the address that actually signed this message. Afterwards, we just need to compare returned address with the address given by user.
import { recoverPersonalSignature } from "@metamask/eth-sig-util" const address="0x00000000000000000000000000000000 const message="Fluffykitten FTW!" const signature="0x00000000000000000000000000000000000000000000000000000000000000000000000000000" const recoveredAddress=recoverPersonalSignature if { console.log console.log console.log console.log
BE CAREFUL: You need to protect your private key and never reveal it to anyone! If somebody intercepts it they will be able to control the wallet and steal your funds.Now you have your wallet ready so we need to top it up with testnet Ether. You can get some from
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