Technical
Jun 26, 2026
10 min read
DC API, OpenID4VP, ZKP: The Runtime Fallback Matrix Every Age-Verification Verifier Must Implement
The EU age-verification verifier guide is unambiguous: your verifier must support two presentation mechanisms and select the best one at runtime. DC API is primary, OpenID4VP is the fallback. Get the fallback matrix wrong and a slice of your users silently fail the age gate.