{"record":{"id":"55395ea93a06a950","repo":"nautechsystems/nautilus_trader","slug":"sealed-transaction-payload-is-bytes-exceeding","errorCode":null,"errorMessage":"Sealed transaction payload is {} bytes, exceeding the {} byte limit","messagePattern":"Sealed transaction payload is (.+?) bytes, exceeding the (.+?) byte limit","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/execution/sealing.rs","lineNumber":402,"sourceCode":"    .context(\"persisted execution calldata is invalid\")?;\n    let value = U256::from_str(&intent.transaction_value)\n        .context(\"persisted execution value is invalid\")?;\n\n    Ok((to, Bytes::from(input), value))\n}\n\npub(crate) fn envelope_key_id(envelope: &[u8]) -> anyhow::Result<[u8; KEY_ID_LEN]> {\n    Ok(parse_envelope(envelope)?.key_id)\n}\n\nstruct ParsedEnvelope<'a> {\n    key_id: [u8; KEY_ID_LEN],\n    nonce: &'a [u8],\n    ciphertext_and_tag: &'a [u8],\n}\n\nfn parse_envelope(envelope: &[u8]) -> anyhow::Result<ParsedEnvelope<'_>> {\n    anyhow::ensure!(\n        envelope.len() <= MAX_SEALED_TRANSACTION_BYTES,\n        \"Sealed transaction payload is {} bytes, exceeding the {} byte limit\",\n        envelope.len(),\n        MAX_SEALED_TRANSACTION_BYTES\n    );\n    anyhow::ensure!(\n        envelope.len() >= ENVELOPE_HEADER_LEN + TAG_LEN,\n        \"Sealed transaction payload is truncated\"\n    );\n    anyhow::ensure!(\n        envelope[0] == ENVELOPE_VERSION,\n        \"Unsupported signed transaction payload envelope version {}\",\n        envelope[0]\n    );\n\n    let key_id = envelope[1..1 + KEY_ID_LEN]\n        .try_into()\n        .expect(\"fixed key ID slice length\");","sourceCodeStart":384,"sourceCodeEnd":420,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/execution/sealing.rs#L384-L420","documentation":"parse_envelope rejects sealed transaction envelopes larger than MAX_SEALED_TRANSACTION_BYTES before attempting to parse the header, key id, nonce, or ciphertext. This is a defensive DoS/size guard: the caller passed an envelope byte buffer that exceeds the configured hard limit, so it cannot possibly be a legitimately sealed transaction produced by `seal`.","triggerScenarios":"Calling unseal() or envelope_key_id() with an envelope byte slice whose length exceeds MAX_SEALED_TRANSACTION_BYTES — e.g. corrupted storage bytes, concatenating/prefixing the ciphertext with extra data, or a buggy producer that wrote trailing bytes.","commonSituations":"A persisted sealed payload was corrupted or truncated incorrectly during database migration; a caller passes an entire file or JSON-wrapped payload instead of the raw sealed bytes; version skew where a newer writer added fields, inflating size past the older reader's limit.","solutions":["Inspect the byte slice length at the call site and find where extra bytes were prepended or appended; pass exactly the sealed envelope bytes","Re-seal the transaction with seal() and re-persist it if the stored payload is corrupted","If payloads legitimately grew, raise MAX_SEALED_TRANSACTION_BYTES deliberately and audit all persisted envelopes for the new limit"],"exampleFix":"// before\nlet envelope = fs::read(path)?;\nunseal(&envelope, ...)?; // envelope includes a JSON wrapper\n// after\nlet raw = fs::read(path)?;\nlet envelope: Vec<u8> = serde_json::from_slice(&raw)?; // extract raw sealed bytes first\nassert!(envelope.len() <= MAX_SEALED_TRANSACTION_BYTES);\nunseal(&envelope, ...)?;","handlingStrategy":"validation","validationCode":"fn ensure_envelope_size(envelope: &[u8]) -> anyhow::Result<()> {\n    anyhow::ensure!(\n        envelope.len() <= MAX_SEALED_TRANSACTION_BYTES,\n        \"sealed envelope is {} bytes, limit is {}\",\n        envelope.len(),\n        MAX_SEALED_TRANSACTION_BYTES\n    );\n    Ok(())\n}","typeGuard":"fn is_valid_envelope_size(envelope: &[u8]) -> bool {\n    envelope.len() <= MAX_SEALED_TRANSACTION_BYTES\n}","tryCatchPattern":"match unseal(&envelope, deployment_id) {\n    Ok(tx) => tx,\n    Err(e) if e.to_string().contains(\"byte limit\") => {\n        // log envelope.len(), quarantine the payload, do not retry\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Store only the raw sealed envelope bytes, never a wrapper or concatenated data","Assert envelope length right after reading from persistence","Keep MAX_SEALED_TRANSACTION_BYTES in sync across producer and consumer versions"],"tags":["blockchain","cryptography","payload-validation"],"backgroundTag":"payload-too-large","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}