How to Add a Memo to a Transaction

Any transaction can add a message making use of the SPL memo program.

import {
 Connection,
 Keypair,
 LAMPORTS_PER_SOL,
 Transaction,
 sendAndConfirmTransaction
} from "openverse-web3";

import { createMemoInstruction } from "openverse-spl-memo";

// Connect to Openverse cluster
const connection = new Connection("https://api.devnet.openverse.network:8899", "confirmed");

// Create keypair for the fee payer
const feePayer = Keypair.generate();

// Request and confirm airdrop
const airdropSignature = await connection.requestAirdrop(
 feePayer.publicKey,
 LAMPORTS_PER_SOL
);

// Get latest blockhash for confirmation
const { blockhash, lastValidBlockHeight } =
 await connection.getLatestBlockhash();
await connection.confirmTransaction({
 signature: airdropSignature,
 blockhash,
 lastValidBlockHeight
});

// Create a memo instruction
const memoInstruction = createMemoInstruction("Hello, World!");

// Create transaction and add the memo instruction
const transaction = new Transaction().add(memoInstruction);

// Sign and send transaction
const transactionSignature = await sendAndConfirmTransaction(
 connection,
 transaction,
 [feePayer]
);
console.log("Transaction Signature: ", transactionSignature);