Value,Description,Reference
less than -65536,Reserved for Private Use,[RFC9668]
-65536 to -1,Unassigned,
0,CBOR Web Token (CWT) containing a COSE_Key in a 'cnf' claim and possibly other claims. CWT is defined in [RFC8392].,[RFC8392]
1,CWT Claims Set (CCS) containing a COSE_Key in a 'cnf' claim and possibly other claims. CCS is defined in [RFC8392].,[RFC8392]
2,X.509 certificate,[RFC5280]
3 to 65535,Unassigned,
greater than 65535,Reserved for Private Use,[RFC9668]