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Here is a step-by-step article on how to convert an address to a pubkey in Solana using web3.js v2 and TypeScript:

Converting an Address to a Pubkey: A Guide to Working with Solana Addresses and Wallet Signatures

In this article, we’ll explore the process of converting a wallet address to a pubkey in Solana using web3.js v2. We’ll also cover how we can receive wallet addresses and signatures from the frontend side in our backend program.

Prerequisites

Before we begin, make sure you have:

• A Solana node installed (either locally or on a cloud provider)

• TypeScript configured with @types/web3.js and typescript

• The required dependencies installed: solana-web3, web3, typescript

Step 1: Create a wallet

First, let’s create a new wallet using the Solana CLI:

npx solana-keygen generate  --pubkey-gen-fp 2048 --out 

Replace with the desired wallet name and with the path where you want to store the private key file.

Step 2: Create a Web3 instance

Create a new TypeScript file (e.g. “solana.ts”) and import the required dependencies:

“typescript”

import * as web3 from “@web3js/web3”;

import * as solanaWeb3 from “solana-web3”;

“”

Then create a function to initialize the Solana wallet instance:

“typescript”

function initWallet() {

const keyPath = “./path/to/wallet/private/key.json”; // Replace with the file path of your private key

return new web3.Web3(new solanaWeb3.PublicKey(keyPath));

}

Step 3: Convert address to pubkey
Now let's create a function that converts a wallet address to a pubkey:

typescript

function convertAddressToPubkey(address: string) {

const wallet = initWallet();

return wallet.publicKey;

}

This function takes a wallet address as input and returns the corresponding pubkey.

Step 4: Verify signature
In our backend program, we need to verify the signature of a received message. We create a new function that verifies the signature using the verifySignature function from @solana/web3.js. First, let's import the required dependencies:

typescript

import { verifySignature } from ‘@solana/web3.js’;

Next, we add the following code to our backend program:

typescript

export async function verifyMessage(message: string) {

const address = ‘your_wallet_address’; // Replace with the wallet address received from the frontend

const signature = ‘your_signature’; // Replace with the signature received from the frontend

try {

await verifySignature(message, address, new web3.PublicKey(signature), { network: ‘mainnet’ });

} catch (error) {

console.error(error);

}

}

In this example, we use the verifySignature function to verify the signature of a received message. We pass the address, signature and network URL as arguments.

Step 5: Converting the address to a pubkey on the frontend
To get wallet addresses and signatures from the frontend side, we can create a simple endpoint that takes an address and a signature as input:

typescript

import axios from ‘axios’;

export async function receiveAddressAndSignature(address: string, signature: string) {

const response = await axios.post(‘/api/verify’, { address, signature });

console.log(response.data);

}

“

This endpoint uses theaxioslibrary to send a POST request to our backend program.

In this example, we send a POST request with the wallet address and signature as input data. Our backend program receives the request and verifies the signature using theverifySignaturefunction from@solana/web3.js`.

That’s all! With these steps, you should be able to convert addresses to pubkeys in Solana using web3.js v2 and TypeScript.

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