{"record":{"id":"395ee9bbe90b2d24","repo":"nautechsystems/nautilus_trader","slug":"invalid-secp256k1-private-key-e","errorCode":null,"errorMessage":"Invalid secp256k1 private key: {e}","messagePattern":"Invalid secp256k1 private key: (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/dydx/src/common/credential.rs","lineNumber":101,"sourceCode":"\nimpl DydxCredential {\n    /// Creates a new [`DydxCredential`] from a raw private key.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if private key is invalid.\n    pub fn from_private_key(\n        private_key_hex: &str,\n        authenticator_ids: Vec<u64>,\n    ) -> anyhow::Result<Self> {\n        // Decode hex private key\n        let key_bytes = Zeroizing::new(\n            hex::decode(private_key_hex.trim_start_matches(\"0x\"))\n                .context(\"Invalid hex private key\")?,\n        );\n\n        let signing_key = SigningKey::from_slice(&key_bytes)\n            .map_err(|e| anyhow::anyhow!(\"Invalid secp256k1 private key: {e}\"))?;\n\n        // Derive bech32 address\n        let public_key = signing_key.public_key();\n        let account_id = public_key\n            .account_id(DYDX_BECH32_PREFIX)\n            .map_err(|e| anyhow::anyhow!(\"Failed to derive account ID: {e}\"))?;\n        let address = account_id.to_string();\n\n        Ok(Self {\n            signing_key,\n            address,\n            authenticator_ids,\n        })\n    }\n\n    /// Creates a [`DydxCredential`] from environment variables.\n    ///\n    /// Checks for private key: `DYDX_PRIVATE_KEY` / `DYDX_TESTNET_PRIVATE_KEY`","sourceCodeStart":83,"sourceCodeEnd":119,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/dydx/src/common/credential.rs#L83-L119","documentation":"DyDxCredentials::from_private_key decodes the hex private key and constructs a k256 SigningKey. SigningKey::from_slice rejects byte slices that are not exactly 32 bytes or not a valid secp256k1 scalar (zero or >= curve order), producing this error.","triggerScenarios":"Calling from_private_key with a key string that hex-decodes to a length other than 32 bytes, an all-zero key, or a scalar out of the valid secp256k1 range.","commonSituations":"Truncated or padded key from a .env file; an Ethereum private key pasted with extra characters; a placeholder/dummy key left in config; key generated for the wrong curve (e.g. ed25519 bytes).","solutions":["Regenerate a valid 32-byte secp256k1 private key (hex, 64 chars) and update the credential","Verify the hex string is exactly 64 characters after stripping an optional 0x prefix","Ensure the key is a secp256k1 key, not an ed25519/other-curve key"],"exampleFix":"// before\nconst PRIVATE_KEY: &str = \"0xabc123\"; // truncated\nlet creds = DyDxCredentials::from_private_key(PRIVATE_KEY)?;\n// after\nconst PRIVATE_KEY: &str = \"0x0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef\";\nlet creds = DyDxCredentials::from_private_key(PRIVATE_KEY)?;","handlingStrategy":"validation","validationCode":"fn key_is_valid(hex_key: &str) -> bool {\n    let s = hex_key.trim_start_matches(\"0x\");\n    s.len() == 64 && s.chars().all(|c| c.is_ascii_hexdigit()) && hex::decode(s).map(|b| b.len() == 32).unwrap_or(false)\n}","typeGuard":null,"tryCatchPattern":"let creds = DyDxCredentials::from_private_key(key).map_err(|e| { eprintln!(\"check PRIVATE_KEY format: 64 hex chars, secp256k1\"); e })?;","preventionTips":["Store exactly 64 hex characters (optionally 0x-prefixed) for the private key","Validate key format at config-load time before client construction","Never use placeholder/zero keys; generate with a secp256k1 tool"],"tags":["rust","crypto","credentials","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"}