HAIP
HAIP, the OpenID4VC High Assurance Interoperability Profile, is an OpenID Foundation specification that constrains the OpenID4VC specs for use where a high level of security and privacy is required — government-issued identity, PID, QEAA — and is the profile the EUDI Wallet ecosystem builds on.
HAIP 1.0 Final (24 December 2025) profiles OpenID4VCI and OpenID4VP 1.0 Final, SD-JWT VC and ISO/IEC 18013-5 (mdoc/mDL) as credential formats, of which an implementation must support at least one, with DCQL as the mandatory query language rather than Presentation Exchange. Trust is anchored in X.509 certificates rather than DIDs, and where a credential is holder-bound a key-binding JWT must be present on presentation. DIIP describes HAIP as complementary rather than competing: both build on the same OpenID4VCI, OpenID4VP and SD-JWT VC foundation, but HAIP is the higher-assurance, X.509-anchored route the EUDI Wallet and eIDAS 2.0 use for identity credentials such as the PID, while DIIP adds DIDs and W3C VCDM 2.0 for cross-domain ecosystems that do not need that level of assurance.