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Version: Canary 🚧

How to Add a Memo to a Transaction

Any transaction can add a message making use of the memo program. Currently the programID from the Memo Program has to be added manually MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr.

import {
Connection,
Keypair,
SystemProgram,
LAMPORTS_PER_SOL,
PublicKey,
Transaction,
TransactionInstruction,
sendAndConfirmTransaction,
} from "@solana/web3.js";

(async () => {
const fromKeypair = Keypair.generate();
const toKeypair = Keypair.generate();

const connection = new Connection(
"https://api.devnet.solana.com",
"confirmed",
);

const airdropSignature = await connection.requestAirdrop(
fromKeypair.publicKey,
LAMPORTS_PER_SOL,
);

await connection.confirmTransaction(airdropSignature);

const lamportsToSend = 10;

const transferTransaction = new Transaction().add(
SystemProgram.transfer({
fromPubkey: fromKeypair.publicKey,
toPubkey: toKeypair.publicKey,
lamports: lamportsToSend,
}),
);

transferTransaction.add(
new TransactionInstruction({
keys: [
{ pubkey: fromKeypair.publicKey, isSigner: true, isWritable: true },
],
data: Buffer.from("Memo message to send in this transaction", "utf-8"),
programId: new PublicKey("MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr"),
}),
);

await sendAndConfirmTransaction(connection, transferTransaction, [
fromKeypair,
]);
})();