EWC RFC100: Interoperability Profile Towards ITB

EWC RFC100 provides a comprehensive framework for ensuring interoperability between digital identity components within the European Union Digital Identity (EUDI) ecosystem. This standard defines the technical requirements and conformance testing procedures for three key actors: Holder Wallets, Issuers, and Verifiers, using the EC Interoperability TestBed (ITB) platform.

The standard establishes a structured approach to validate implementations against the EWC Reference Model, ensuring technical interoperability for EUDI wallet use cases. It specifies detailed REST API requirements, testing procedures, and conformance steps for each actor in the ecosystem.

Key differentiators include:

• Integration with the official EC ITB platform
• Mandatory support for SD-JWT (Selective Disclosure JSON Web Tokens)
• Comprehensive testing framework for all ecosystem participants
• Standardized REST endpoints for interoperability testing

Technical Analysis:

1. Purpose and Scope:

• Validates implementation conformance for EUDI wallet ecosystem components
• Ensures interoperability between Holder Wallets, Issuers, and Verifiers
• Establishes standardized testing procedures via ITB

2. Key Technical Specifications:

• REST API requirements:
  • GET endpoints for credential issuance and verification
  • JSON response formats
  • Base64 encoded QR codes for credential offers
• Support for:
  • OIDC4VC protocol
  • SD-JWT format
  • vc+sd-jwt and vp+sd-jwt implementations

3. Implementation Requirements:

• Holder Wallets must:

  • Implement EWC RFCs for OIDC4VC
  • Pass conformance tests via ITB platform
  • Support selective disclosure capabilities

• Issuers must:

  • Expose credential offer endpoints
  • Implement status polling endpoints
  • Follow EWC RFC001 specifications

• Verifiers must:

  • Implement VP request endpoints
  • Support verification status polling
  • Comply with EWC RFC002 requirements

4. Security Considerations:

• Session management requirements
• Unique session ID tracking
• Secure endpoint exposure
• Trust framework compliance

5. Interoperability Features:

• Standardized REST APIs
• Common data formats
• Unified testing procedures
• Cross-component validation

6. Current Adoption Status:

• Implemented in EWC LSP (Large Scale Pilot)
• Required for Phase 2 piloting
• Integrated with EC ITB platform