Solana: how to partially sign a Versioned Transaction

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Partually signed transaction are important part of some Solana scenarios. For example, to control something by the backend, or to generate some custom "beautiful" addresses.

The problem is: in the old, Legacy transactions, there was a method partialSign but in a modern VersionedTransaction this method is missing.

How to partially sign a VersionedTransaction?


const {ed25519} = require('@noble/curves/ed25519');

const sign = (
	message,
	secretKey
  ) => ed25519.sign(message, secretKey.slice(0, 32));

const transaction = new VersionedTransaction(message);
const extraSignature = sign(transaction.message.serialize(), mintKey.secretKey);
transaction.addSignature(mintKey.publicKey, extraSignature);

transaction.sign([wallet]);

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