Micro-Credentials software.

The European Learning Model and European Digital Credentials for Learning give micro-credentials, badges and qualifications a standardised, cryptographically verifiable data model — but standardised doesn't mean static: ELM has gone through multiple versions, and a credential issued under an earlier profile still needs to validate correctly against a verifier built for the current one.

A verification API for this space has to handle profile and schema versioning, seal and signature validation, and credential-validity windows as first-class concerns, because the whole point of a digital credential is that a third party — an employer, another institution — can verify it independently years after issuance, not just at the moment it was minted.

That durability requirement is what separates a compliant ELM verifier from a PDF badge with a QR code stapled on: the verification service has to keep validating credentials correctly as issuers rotate signing keys, as the specification itself is revised, and as institutions that issued a credential years ago change systems or shut down entirely.