Additionally issuer-key-id is confusing terminology given that a Certificate Authority is an Issuer of Subject keys. For CoRIM, the signature would come from a digitalSignature KeyUsage key, which is rare to mix with a keyCertSign KeyUsage. I'd amend this to reference the COSE RFC's comment on value 4 being a "key identifier" with just "key-id".
'3.1.4.1.7. Domain Types" says 3 types are defined, but it defines 4. I suspect the OID should be classified as global scope.
@deeglaze on the RATS mailing list: