{"record":{"id":"f611df9c0cd131fd","repo":"nautechsystems/nautilus_trader","slug":"blockchain-address-address-is-incorrect-e","errorCode":null,"errorMessage":"Blockchain address '{address}' is incorrect: {e}","messagePattern":"Blockchain address '(.+?)' is incorrect: (.+?)","errorType":"validation","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/model/src/defi/validation.rs","lineNumber":43,"sourceCode":"\n/// Validates an Ethereum address format, checksum, and returns the parsed address.\n///\n/// # Errors\n///\n/// This function returns an error if:\n/// - The address does not start with the `0x` prefix.\n/// - The address has invalid length (must be 42 characters including `0x`).\n/// - The address contains invalid hexadecimal characters.\n/// - The address has an incorrect checksum (for checksummed addresses).\npub fn validate_address(address: &str) -> anyhow::Result<Address> {\n    // Check if the address starts with \"0x\"\n    if !address.starts_with(\"0x\") {\n        anyhow::bail!(\"Ethereum address must start with '0x': {address}\");\n    }\n\n    // Check if the address is valid\n    let parsed_address = Address::from_str(address)\n        .map_err(|e| anyhow::anyhow!(\"Blockchain address '{address}' is incorrect: {e}\"))?;\n\n    // Check if checksum is valid\n    Address::parse_checksummed(address, None)\n        .map_err(|_| anyhow::anyhow!(\"Blockchain address '{address}' has incorrect checksum\"))?;\n\n    Ok(parsed_address)\n}\n\n#[cfg(test)]\nmod tests {\n    use rstest::rstest;\n\n    use super::*;\n\n    #[rstest]\n    fn test_validate_address_invalid_prefix() {\n        let invalid_address = \"742d35Cc6634C0532925a3b844Bc454e4438f44e\";\n        let result = validate_address(invalid_address);","sourceCodeStart":25,"sourceCodeEnd":61,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/model/src/defi/validation.rs#L25-L61","documentation":"validate_address parses an Ethereum address string into an alloy Address after checking the 0x prefix. This error wraps the low-level parse failure: the string has invalid length (must be 42 chars including 0x) or contains non-hexadecimal characters. The library throws it to surface malformed blockchain identifiers early instead of propagating them into pool or token state.","triggerScenarios":"Calling validate_address (or APIs that call it: PoolPosition construction, decode_address, multicall setup, subscribe handling) with a string that is not exactly '0x' + 40 hex characters, or contains invalid characters.","commonSituations":"Hardcoded addresses with typos; addresses truncated or pasted without the 0x prefix handled elsewhere; reading token addresses from a config/CSV with whitespace or quotes; mixing 20-byte binary data rendered as decimal.","solutions":["Ensure the address string is exactly 42 characters and starts with 0x.","Strip surrounding whitespace/quotes and trim before validating.","Verify the address source (config file, CSV, database) for truncation or encoding issues.","Regenerate the address from a trusted source; a parse failure usually means a typo."],"exampleFix":"// before\nlet addr = validate_address(raw_address.trim_matches('\"'))?;\n// after\nlet cleaned = raw_address.trim().trim_start_matches(\"\\\"\").trim_end_matches(\"\\\"\").to_lowercase();\nif cleaned.len() != 42 || !cleaned.starts_with(\"0x\") {\n    anyhow::bail!(\"malformed address: {raw_address}\");\n}\nlet addr = validate_address(&cleaned)?;","handlingStrategy":"validation","validationCode":"fn looks_like_eth_address(s: &str) -> bool {\n    let s = s.trim();\n    s.len() == 42 && s.starts_with(\"0x\") && s[2..].chars().all(|c| c.is_ascii_hexdigit())\n}","typeGuard":"fn parse_eth_address(s: &str) -> Option<alloy_primitives::Address> {\n    alloy_primitives::Address::from_str(s.trim()).ok()\n}","tryCatchPattern":"match validate_address(input.trim()) {\n    Ok(addr) => addr,\n    Err(e) if e.to_string().contains(\"is incorrect\") => {\n        tracing::warn!(\"malformed address in config: {input}\");\n        return Err(e);\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Normalize addresses (trim, lowercase) before validation","Store addresses in configs without quotes/whitespace corruption","Validate all configured addresses at startup, fail fast with context"],"tags":["rust","ethereum","address","validation"],"backgroundTag":"invalid-identifier-format","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"}