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feat: add v0 txn support for solana #188

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feat: add v0 txn support for solana #188

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8b252e0
feat: add v0 txn support for solana
Keyur279 May 5, 2026
e8fdb82
feat: serialize v0 txn using VersionedTransaction from solana web3
Keyur279 Jun 1, 2026
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48 changes: 33 additions & 15 deletions packages/app-solana/src/operations/signTxn/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -100,22 +100,40 @@ export const signTxn = async (
let serializedTxnHex: string | undefined;

if (params.serializeTxn) {
const msgBytes = Buffer.from(params.txn, 'hex');
const isVersioned = msgBytes.length > 0 && msgBytes[0] === 0x80;

const solanaWeb3 = getSolanaWeb3();
const transaction = solanaWeb3.Transaction.populate(
solanaWeb3.Message.from(Buffer.from(params.txn, 'hex')),
);
if (latestBlockHash) transaction.recentBlockhash = latestBlockHash;
assert(
transaction.feePayer,
new Error('Cannot decode feePayer in solana txn'),
);
transaction.addSignature(
transaction.feePayer,
Buffer.from(signature, 'hex'),
);
const serializedTxnBuffer = transaction.serialize();
serializedTxnHex = uint8ArrayToHex(serializedTxnBuffer);
serializedTxn = base58Encode(serializedTxnBuffer);
if (isVersioned) {

@muzaffarbhat07 muzaffarbhat07 Jun 1, 2026

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Why do we need to handle versioned transactions manually? Does SolanaWeb3 not support versioned transactions?

const serializedVersionedTxn = Buffer.concat([
Buffer.from([0x01]),
Buffer.from(signature, 'hex'),
msgBytes,
]);
const vt = solanaWeb3.VersionedTransaction.deserialize(
serializedVersionedTxn,
);
if (latestBlockHash) vt.message.recentBlockhash = latestBlockHash;
const serializedTxnBuffer = Buffer.from(vt.serialize());
serializedTxnHex = uint8ArrayToHex(serializedTxnBuffer);
serializedTxn = base58Encode(serializedTxnBuffer);
} else {
const transaction = solanaWeb3.Transaction.populate(
solanaWeb3.Message.from(msgBytes),
);
if (latestBlockHash) transaction.recentBlockhash = latestBlockHash;
assert(
transaction.feePayer,
new Error('Cannot decode feePayer in solana txn'),
);
transaction.addSignature(
transaction.feePayer,
Buffer.from(signature, 'hex'),
);
const serializedTxnBuffer = transaction.serialize();
serializedTxnHex = uint8ArrayToHex(serializedTxnBuffer);
serializedTxn = base58Encode(serializedTxnBuffer);
}
}

return {
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