@solana/spl-memo/lib/esm/index.js

SPL Memo Program JS API

import { Buffer } from 'buffer';
import { PublicKey, TransactionInstruction } from '@solana/web3.js';
export const MEMO_PROGRAM_ID = new PublicKey('MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr');
/**
 * Creates and returns an instruction which validates a string of UTF-8
 * encoded characters and verifies that any accounts provided are signers of
 * the transaction.  The program also logs the memo, as well as any verified
 * signer addresses, to the transaction log, so that anyone can easily observe
 * memos and know they were approved by zero or more addresses by inspecting
 * the transaction log from a trusted provider.
 *
 * Public keys passed in via the signerPubkeys will identify Signers which
 * must subsequently sign the Transaction including the returned
 * TransactionInstruction in order for the transaction to be valid.
 *
 * @param memo The UTF-8 encoded memo string to validate
 * @param signerPubkeys An array of public keys which must sign the
 *        Transaction including the returned TransactionInstruction in order
 *        for the transaction to be valid and the memo verification to
 *        succeed.  null is allowed if there are no signers for the memo
 *        verification.
 **/
export function createMemoInstruction(memo, signerPubkeys) {
    const keys = signerPubkeys == null
        ? []
        : signerPubkeys.map(function (key) {
            return { pubkey: key, isSigner: true, isWritable: false };
        });
    return new TransactionInstruction({
        keys: keys,
        programId: MEMO_PROGRAM_ID,
        data: Buffer.from(memo, 'utf8'),
    });
}
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