{"record":{"id":"c016c68213bf8dc8","repo":"nautechsystems/nautilus_trader","slug":"signer-private-key-in-is-not-a-valid-secp256k","errorCode":null,"errorMessage":"Signer private key in '{}' is not a valid secp256k1 private key","messagePattern":"Signer private key in '(.+?)' is not a valid secp256k1 private key","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/execution/client.rs","lineNumber":6184,"sourceCode":"        // logged, serialized, or stored in configuration\n        let private_key = Zeroizing::new(\n            std::env::var(&self.config.signer_private_key_env).map_err(|_| {\n                anyhow::anyhow!(\n                    \"Signer private key environment variable '{}' is not set\",\n                    self.config.signer_private_key_env\n                )\n            })?,\n        );\n        let encoded_key = private_key.trim();\n        let encoded_key = encoded_key.strip_prefix(\"0x\").unwrap_or(encoded_key);\n        let key_bytes = Zeroizing::new(hex::decode_array::<32>(encoded_key).map_err(|_| {\n            anyhow::anyhow!(\n                \"Signer private key in '{}' is not a valid hex private key\",\n                self.config.signer_private_key_env\n            )\n        })?);\n        let signer = PrivateKeySigner::from_slice(&key_bytes[..]).map_err(|_| {\n            anyhow::anyhow!(\n                \"Signer private key in '{}' is not a valid secp256k1 private key\",\n                self.config.signer_private_key_env\n            )\n        })?;\n\n        if signer.address() != self.wallet_address {\n            anyhow::bail!(\n                \"Signer address {} derived from '{}' does not match configured wallet address {}\",\n                signer.address(),\n                self.config.signer_private_key_env,\n                self.wallet_address\n            );\n        }\n\n        self.signer = Some(Arc::new(signer));\n        drop(payload_connect_lease);\n\n        if self.cache.has_database()","sourceCodeStart":6166,"sourceCodeEnd":6202,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/execution/client.rs#L6166-L6202","documentation":"The 32 decoded bytes must constitute a valid secp256k1 private key via PrivateKeySigner::from_slice. Keys equal to zero, >= the curve order, or otherwise out of the valid scalar range are rejected with this error.","triggerScenarios":"PrivateKeySigner::from_slice(&key_bytes) returns Err — the 32 bytes decode as hex but are not a valid secp256k1 scalar (all zeros, >= n, or bad length already handled earlier).","commonSituations":"Placeholder/dummy keys (all zeros or 0x00..01) left in environment, a key generated for a different scheme (ed25519) reinterpreted as secp256k1 bytes, or a corrupted secret in the vault.","solutions":["Generate a valid key with an Ethereum-compatible tool (e.g. cast wallet new) and set it in the env var.","Confirm the key is an Ethereum/secp256k1 key, not a Solana/ed25519 or placeholder key.","Check the secret source (vault/KMS export) was not truncated or zero-padded during injection.","Immediately rotate any exposed or suspicious key value."],"exampleFix":"// before\nexport SIGNER_KEY=0x0000000000000000000000000000000000000000000000000000000000000000  // invalid scalar\n\n// after\nexport SIGNER_KEY=$(cast wallet new | awk '/Private key/{print $3}')","handlingStrategy":"validation","validationCode":"// reject non-secp256k1 scalars before init\nlet key = [u8; 32]; // decoded hex\nassert!(!key.iter().all(|&b| b == 0), \"private key is zero\");","typeGuard":"fn is_valid_secp256k1_scalar(bytes: &[u8; 32]) -> bool { !bytes.iter().all(|&b| b == 0) && PrivateKeySigner::from_slice(bytes).is_ok() }","tryCatchPattern":"match client.connect().await {\n    Err(e) if e.to_string().contains(\"secp256k1\") => eprintln!(\"replace with a valid Ethereum-compatible private key\"),\n    other => other.map(|_| ()),\n}","preventionTips":["Generate keys with Ethereum tooling (cast wallet new, eth-keygen)","Reject all-zero or placeholder keys at secret-injection time","Keep key scheme (secp256k1 vs ed25519) documented per chain","Rotate and verify keys after any vault export"],"tags":["signing","secp256k1","crypto","secrets"],"backgroundTag":"invalid-argument-value","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}