{"record":{"id":"cc37c844e3fc1dc2","repo":"nautechsystems/nautilus_trader","slug":"verified-transaction-fields-differ-from-the-authen","errorCode":null,"errorMessage":"Verified transaction fields differ from the authenticated signed payload","messagePattern":"Verified transaction fields differ from the authenticated signed payload","errorType":"validation","errorClass":"anyhow::Error","httpStatus":null,"severity":"critical","filePath":"crates/adapters/blockchain/src/execution/client.rs","lineNumber":4287,"sourceCode":") -> anyhow::Result<()> {\n    anyhow::ensure!(\n        profiler_block <= latest_block,\n        \"Pool state at block {profiler_block} is ahead of the latest block {latest_block}; the execution RPC endpoint lags the data feed\"\n    );\n    let quote_age = latest_block - profiler_block;\n    anyhow::ensure!(\n        quote_age <= max_age_blocks,\n        \"Stale quote: pool state at block {profiler_block}, latest block {latest_block}, exceeds `max_quote_age_blocks` {max_age_blocks}\"\n    );\n    Ok(())\n}\n\nfn validate_rpc_transaction_matches_payload(\n    transaction: &RpcTransaction,\n    raw_transaction: &[u8],\n) -> anyhow::Result<()> {\n    let signed = decode_signed_transaction(raw_transaction)?;\n    anyhow::ensure!(\n        transaction.hash == signed.hash\n            && transaction.from == signed.signer\n            && transaction.nonce == signed.nonce\n            && transaction.chain_id == Some(signed.chain_id)\n            && transaction.transaction_type == Some(2)\n            && transaction.to == Some(signed.to)\n            && transaction.input == signed.input\n            && transaction.value == signed.value\n            && transaction.gas == Some(signed.gas_limit)\n            && transaction.max_fee_per_gas == Some(U256::from(signed.max_fee_per_gas))\n            && transaction.max_priority_fee_per_gas\n                == Some(U256::from(signed.max_priority_fee_per_gas)),\n        \"Verified transaction fields differ from the authenticated signed payload\"\n    );\n    Ok(())\n}\n\nasync fn verify_finalized_transaction(","sourceCodeStart":4269,"sourceCodeEnd":4305,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/execution/client.rs#L4269-L4305","documentation":"Before submitting a raw transaction, the library decodes the locally signed payload and compares every field of the RPC-returned transaction (hash, from, nonce, chain_id, type=2 EIP-1559, to, etc.) against the decoded signature. This error means the transaction the node reports differs from what was actually signed — a safety check against RPC tampering, field mutation, or decoding mismatches.","triggerScenarios":"Calling validate_rpc_transaction_matches_payload when the fetched RpcTransaction differs from decode_signed_transaction(raw_transaction) on hash, signer, nonce, chain_id, transaction_type != 2, or to address.","commonSituations":"RPC proxy/middleware rewriting transaction fields (e.g., adding gas or changing type); signing and sending through different library versions (legacy vs EIP-1559 encoding mismatch); decoding the wrong raw bytes; malicious or buggy relayer modifying the payload.","solutions":["Re-sign and re-send with a consistent signer/encoder version; verify chain_id and type=2 (EIP-1559) are set at signing time.","Inspect any RPC proxy/middleware between client and node for field mutation; bypass or fix it.","Confirm the raw bytes passed to validation are exactly the signed payload (not re-encoded).","Upgrade the signing and transaction decode libraries to matched versions so field encoding agrees."],"exampleFix":"// before: raw bytes re-encoded before validation\nlet raw = re_encode_for_rpc(&signed_tx);\nvalidate_rpc_transaction_matches_payload(&fetched, &raw)?;\n\n// after: validate against the exact signed payload\nlet raw = signed_tx.encoded_2718();\nvalidate_rpc_transaction_matches_payload(&fetched, raw)?;","handlingStrategy":"validation","validationCode":"let signed = decode_signed_transaction(&raw)?;\nassert_eq!(fetched.hash, signed.hash);\nassert_eq!(fetched.from, signed.signer);\nassert_eq!(fetched.nonce, signed.nonce);\nassert_eq!(fetched.chain_id, Some(signed.chain_id));\nassert_eq!(fetched.transaction_type, Some(2));","typeGuard":"fn tx_matches_payload(tx: &RpcTransaction, signed: &SignedTx) -> bool {\n    tx.hash == signed.hash\n        && tx.from == signed.signer\n        && tx.nonce == signed.nonce\n        && tx.chain_id == Some(signed.chain_id)\n        && tx.transaction_type == Some(2)\n        && tx.to == Some(signed.to)\n}","tryCatchPattern":"match client.send_raw_transaction(&raw).await {\n    Ok(h) => h,\n    Err(e) if e.to_string().contains(\"differ from the authenticated signed payload\") => {\n        // treat as potentially tampered: re-sign locally and abort this submission\n        resign_and_abort(e)\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Validate against the exact encoded_2718 signed bytes, never re-encoded payloads","Audit RPC proxies/middleware for transaction field mutation","Keep signer and transaction libraries on matched versions","Always sign with explicit chain_id and EIP-1559 type"],"tags":["blockchain","transaction","integrity","rpc"],"backgroundTag":"checksum-mismatch","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"}