https://datatracker.ietf.org/doc/html/rfc8415#section-11 ----------------------------------------------------------------- Clients and servers MUST treat DUIDs as opaque values and MUST only compare DUIDs for equality. Clients and servers SHOULD NOT in any other way interpret DUIDs. Clients and servers MUST NOT restrict DUIDs to the types defined in this document, as additional DUID types may be defined in the future.