Transaction v1 Support

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What changes in transaction v1

• You must opt in to receive it. Requests for full transaction data need maxSupportedTransactionVersion: 1, and your client library needs a version that can deserialize v1.
• The compute budget moves into the message header. A v1 message carries a transactionConfig object with computeUnitLimit, heapSize, loadedAccountsDataSizeLimit, and priorityFee. There are no ComputeBudget program instructions in a v1 transaction.

{
  "version": 1,
  "transaction": {
    "signatures": ["..."],
    "message": {
      "accountKeys": ["..."],
      "instructions": [
        { "programIdIndex": 3, "accounts": [0, 1], "data": "3Bxs4..." }
      ],
      "recentBlockhash": "...",
      "transactionConfig": {
        "computeUnitLimit": 200000,
        "heapSize": null,
        "loadedAccountsDataSizeLimit": 200000,
        "priorityFee": 50000
      }
    }
  }
}

​

Set maxSupportedTransactionVersion to 1

• getTransaction
• getBlock
• getTransactionsForAddress with transactionDetails: "full"
• transactionSubscribe with transactionDetails: "accounts" or "full"
• blockSubscribe

{
  "jsonrpc": "2.0",
  "error": {
    "code": -32015,
    "message": "Transaction version (1) is not supported by the requesting client. Please use \"maxSupportedTransactionVersion\" in your request."
  },
  "id": 1
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getTransaction",
  "params": [
    "2id3YC2jK9G5Wo2phDx4gJVAew8DcY5NAojnVuao8rkxwPYPe8cSwE5GzhEgJA2y8fVjDEo6iR6ykBvDxrTQrtpb",
    {
      "encoding": "jsonParsed",
      "commitment": "confirmed",
      "maxSupportedTransactionVersion": 1
    }
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getBlock",
  "params": [
    341197053,
    {
      "encoding": "jsonParsed",
      "transactionDetails": "full",
      "maxSupportedTransactionVersion": 1
    }
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getTransactionsForAddress",
  "params": [
    "86xCnPeV69n6t3DnyGvkKobf9FdN2H9oiVDdaMpo2MMY",
    {
      "transactionDetails": "full",
      "encoding": "jsonParsed",
      "limit": 100,
      "maxSupportedTransactionVersion": 1
    }
  ]
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "transactionSubscribe",
  "params": [
    { "accountInclude": ["86xCnPeV69n6t3DnyGvkKobf9FdN2H9oiVDdaMpo2MMY"] },
    {
      "commitment": "confirmed",
      "encoding": "jsonParsed",
      "transactionDetails": "full",
      "maxSupportedTransactionVersion": 1
    }
  ]
}

​

Upgrade your SDK before raising the value

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Read priority fees from transactionConfig

import bs58 from "bs58";

const COMPUTE_BUDGET = "ComputeBudget111111111111111111111111111111";

/** Total priority fee in lamports for a `json`-encoded transaction. */
function priorityFeeLamports(tx: any): number {
  const message = tx.transaction.message;

  // v1: the header carries the total directly.
  if (message.transactionConfig) {
    return message.transactionConfig.priorityFee ?? 0;
  }

  // Legacy and v0: derive it from ComputeBudget instructions.
  let microLamportsPerCu = 0n;
  let computeUnitLimit: bigint | null = null;
  let otherInstructions = 0;

  for (const ix of message.instructions) {
    if (message.accountKeys[ix.programIdIndex] !== COMPUTE_BUDGET) {
      otherInstructions++;
      continue;
    }
    const data = bs58.decode(ix.data);
    const view = new DataView(data.buffer, data.byteOffset, data.byteLength);
    if (data[0] === 2) computeUnitLimit = BigInt(view.getUint32(1, true));
    if (data[0] === 3) microLamportsPerCu = view.getBigUint64(1, true);
  }

  // Without an explicit limit, the runtime grants 200,000 CU per non-ComputeBudget instruction, capped at 1,400,000.
  const limit = computeUnitLimit ?? BigInt(Math.min(otherInstructions * 200_000, 1_400_000));
  return Number((microLamportsPerCu * limit) / 1_000_000n);
}

​

Decode raw transaction bytes with a v1-aware parser

• Version byte. A v1 transaction starts with 0x81 (decimal 129). A v0 transaction starts with 0x80.
• Signatures move to the end. Legacy and v0 put signatures first, then the message. Transaction v1 puts the message first and the signatures last, so bincode-style decoders that expect a leading signature array fail on v1 bytes.

• Rust: agave-transaction-view parses legacy, v0, and v1 in place. wincode, the bincode-compatible serializer used by current Solana SDKs, also decodes v1 into VersionedTransaction.
• JavaScript / TypeScript: @solana/kit 8.0+ or @solana/web3.js v3.

​

Checklist

1. Grep for getBlock, getTransaction, getTransactionsForAddress, transactionSubscribe, and blockSubscribe, including raw JSON-RPC bodies and SDK wrappers such as connection.getParsedTransaction.
2. Upgrade to a v1-capable SDK.
3. Set maxSupportedTransactionVersion: 1 on every call found in step 1.
4. Replace ComputeBudget instruction scanning with a transactionConfig check, and treat priorityFee as total lamports.
5. Replace bincode-style raw decoders with agave-transaction-view or an upgraded SDK.
6. Bump streaming dependencies to the versions in the table above.
7. Grep logs for -32015 after the change to confirm nothing still fails.

​

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