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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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67 changes: 51 additions & 16 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 +100,57 @@ export const signTxn = async (
let serializedTxnHex: string | undefined;

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

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 updatedMsgBytes = Buffer.from(msgBytes);
if (latestBlockHash) {
const bhBytes = Buffer.from(base58Decode(latestBlockHash));
/* Locate blockhash in v0 message:
[0x80 version] [3 header bytes] [compact-u16 acct count] [acct keys * 32] [32 blockhash]
See: https://solana.com/docs/core/transactions/versioned-transactions */
let off = 4;
let acctCount = 0;
let shift = 0;
while (off < updatedMsgBytes.length) {
const b = updatedMsgBytes[off];
off += 1;
acctCount += (b % 128) * 2 ** shift;
if (b < 128) break;
shift += 7;
}
off += acctCount * 32;
bhBytes.copy(updatedMsgBytes, off);
}

const sigCount = Buffer.from([0x01]);
const sigBytes = Buffer.from(signature, 'hex');
const serializedTxnBuffer = Buffer.concat([
sigCount,
sigBytes,
updatedMsgBytes,
]);
serializedTxnHex = uint8ArrayToHex(serializedTxnBuffer);
serializedTxn = base58Encode(serializedTxnBuffer);
} else {
const solanaWeb3 = getSolanaWeb3();
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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