Credential Identifier
Globally unique identifier by which the creator, owner or provider of a credential recognizes that credential in transactions with the external environment (e.g., in verifiable claims involving the credential).
The identifier may take the form of a URN, UUID, ARK, DOI, INFO or any other publicly recognized, globally unique identifier scheme.
Best practice for descriptions intended for the Credential Engine Registry is to use the ceterms:ctid property for this purpose; ceterms:ctid is declared as a subproperty of ceterms:credentialId.