EUDI Wallet standards explained
EUDI interoperability uses multiple layers: law and implementing rules, the Architecture and Reference Framework, issuance and presentation protocols, credential formats, trust mechanisms and conformance or certification evidence.
OpenID4VP 1.0 and OpenID4VCI 1.0 are final specifications and have a conformance programme with HAIP. EUDI profiles and referenced standards still require precise version checks for a specific implementation.
For: Irish architects, security reviewers, technical buyers and product owners. This is independent information, not legal, compliance or security advice.
Protocol and format are different
- OpenID4VCI: protocol for issuing credentials to a wallet.
- OpenID4VP: protocol for requesting and presenting credentials.
- HAIP: a high-assurance interoperability profile constraining choices.
- mdoc: an ISO-origin credential/data model family used for mobile documents.
- SD-JWT VC: a selectively disclosable JWT-based credential format.
A standards claim needs a version
'Supports OpenID' is too vague. Record the named specification, version, profile, credential formats, device/browser transports, conformance result and interoperability partners. Confirm whether support is production, beta or roadmap.
Architecture decisions
- Issuer metadata and trust discovery.
- Same-device and cross-device initiation.
- Request signing and relying-party authentication.
- Presentation binding, nonce and replay protection.
- Credential/status validation and error handling.
- Privacy, unlinkability and logging.
Buyer outcome
Use standards to reduce proprietary lock-in, but do not assume two products interoperate because they mention the same protocol. Test the exact profile, format, trust and transaction flow.
Evidence and limits
MyID separates enacted rules, official implementation material, testing and vendor claims. A source can establish what its publisher says; it does not prove that every product, deployment or interpretation works as claimed. Where Irish implementation remains unsettled, this page says so.
- European Commission EUDI Wallet Toolbox and ARF
- ENISA Digital Identity Standards
- OpenID Digital Credentials Protocols
- OpenID4VP and OpenID4VCI conformance programme
Sources checked 22 August 2026. Re-check the linked primary material before making a consequential decision.
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