Implementation Considerations
Error handling, performance optimization, and security considerations
Error Handling
The verification protocol defines standardized error handling for various failure conditions:
Error Codes
| Error Code | Description | Recovery Action |
|---|---|---|
| VER-001 | Invalid credential format | Agent must obtain a valid credential |
| VER-002 | Expired credential | Agent must request credential renewal |
| VER-003 | Revoked credential | Agent must request new delegation |
| VER-004 | Signature verification failed | Security incident, investigate |
| VER-005 | Scope not authorized | Request appropriate delegation scope |
| VER-006 | Constraints not satisfied | Retry under appropriate conditions |
| VER-007 | DID resolution failure | Check DID or resolver availability |
Error Response Format
{
"error": {
"code": "VER-003",
"message": "The presented credential has been revoked",
"details": {
"credentialId": "urn:uuid:3978344f-8596-4c3a-a978-8fcaba3903c5",
"revocationTime": "2025-06-10T12:30:00Z"
}
}
}
Implementation Considerations
Performance Optimization
To optimize verification performance:
- Caching: Cache DID documents and revocation status
- Parallel Processing: Verify signature while checking revocation
- Efficient Algorithms: Use optimized cryptographic libraries
- Connection Reuse: Maintain persistent connections to resolvers and services
Security Considerations
When implementing the verification protocol:
- Key Protection: Secure all verification keys
- Timing Attacks: Use constant-time comparison for signatures
- Replay Protection: Validate nonces and timestamps
- Logging: Maintain secure audit logs of verification decisions
Implementation Testing
Test your verification implementation against both valid and invalid credentials. Include edge cases like almost-expired credentials, revoked credentials, and malformed signatures.