{"record":{"id":"abb21ef25319a269","repo":"nautechsystems/nautilus_trader","slug":"invalid-secp256k1-private-key-e-abb21e","errorCode":null,"errorMessage":"Invalid secp256k1 private key: {e}","messagePattern":"Invalid secp256k1 private key: (.+?)","errorType":"exception","errorClass":"anyhow::Error","httpStatus":null,"severity":"error","filePath":"crates/adapters/dydx/src/execution/wallet.rs","lineNumber":95,"sourceCode":"}\n\nimpl Wallet {\n    /// Create a wallet from a hex-encoded private key.\n    ///\n    /// The private key should be a 32-byte secp256k1 key encoded as hex,\n    /// optionally with a `0x` prefix. Address and account ID are derived\n    /// during construction.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if the private key is invalid hex or not a valid secp256k1 key.\n    pub fn from_private_key(private_key_hex: &str) -> anyhow::Result<Self> {\n        let key_bytes = hex::decode(private_key_hex.trim_start_matches(\"0x\"))\n            .context(\"Invalid hex private key\")?;\n\n        // Validate the key and derive address/account_id\n        let signing_key = SigningKey::from_slice(&key_bytes)\n            .map_err(|e| anyhow::anyhow!(\"Invalid secp256k1 private key: {e}\"))?;\n\n        let public_key = signing_key.public_key();\n        let account_id = public_key\n            .account_id(BECH32_PREFIX_DYDX)\n            .map_err(|e| anyhow::anyhow!(\"Failed to derive account ID: {e}\"))?;\n        let address = account_id.to_string();\n\n        Ok(Self {\n            private_key_bytes: key_bytes.into_boxed_slice(),\n            address,\n            account_id,\n        })\n    }\n\n    /// Get a dYdX account with zero account and sequence numbers.\n    ///\n    /// Creates an account using the pre-computed address/account_id.\n    /// SigningKey is recreated from stored bytes (it doesn't implement Clone).","sourceCodeStart":77,"sourceCodeEnd":113,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/dydx/src/execution/wallet.rs#L77-L113","documentation":"DydxWallet::from_private_key decodes the caller-supplied hex string and then validates it as a secp256k1 scalar via k256's SigningKey::from_slice. If the decoded bytes are not a valid private key (wrong length or out of the valid scalar range), the wallet cannot be constructed and this error is returned.","triggerScenarios":"Calling DydxWallet::from_private_key(hex) where the hex decodes to bytes that k256 rejects: not exactly 32 bytes, or numerically >= the secp256k1 curve order, or all zeros.","commonSituations":"Typing or pasting a truncated key; exporting a key with an unexpected encoding (e.g. 33-byte compressed representation instead of the 32-byte scalar); passing a mnemonic phrase or an Ethereum keystore JSON instead of a raw hex scalar; hand-writing a test key that happens to be invalid.","solutions":["Check the key is a 64-character hex string (32 bytes), with optional 0x prefix, representing a scalar in [1, n-1].","Re-export the key from the source wallet as a raw 32-byte hex private key (e.g. from a dYdX/Ethereum wallet's 'export private key' option).","Trim whitespace and any 0x prefix issues; the code trims '0x' but stray characters will already fail earlier at 'Invalid hex private key'.","Generate a fresh valid key for testing (e.g. k256::ecdsa::SigningKey::random or a known-good hex constant)."],"exampleFix":"// before\nlet wallet = DydxWallet::from_private_key(\"aabbcc\")?; // 3 bytes -> invalid\n// after\nlet wallet = DydxWallet::from_private_key(\"0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\")?; // 32 bytes","handlingStrategy":"validation","validationCode":"let key = private_key_hex.trim_start_matches(\"0x\");\nassert_eq!(key.len(), 64, \"key must be 64 hex chars (32 bytes)\");\nlet bytes = hex::decode(key)?;\nassert!(!bytes.iter().all(|&b| b == 0), \"zero key is invalid\");","typeGuard":"fn is_valid_hex_key(s: &str) -> bool {\n    let k = s.trim_start_matches(\"0x\");\n    k.len() == 64 && hex::decode(k).map(|b| b.len() == 32 && !b.iter().all(|&x| x == 0)).unwrap_or(false)\n}","tryCatchPattern":"match DydxWallet::from_private_key(hex) {\n    Ok(w) => w,\n    Err(e) if e.to_string().contains(\"Invalid secp256k1 private key\") => {\n        // fix key format/length before retry\n        return Err(e);\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Store keys as exactly 64 hex chars, 0x prefix optional","Never pass mnemonics or keystore JSON where a raw hex scalar is expected","Validate the key in config loading, before client startup"],"tags":["dydx","crypto","secp256k1","wallet","key-validation"],"backgroundTag":"invalid-argument-value","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"}