Re: usage of credentialSubject WITHOUT id?

thank you Niels!
A link to the “Bearer Credentials” section in the “Credential Subject” section would be helpful, because having read all the spec loosely and during the course of several days, I forgot the link between the two concepts (when id is missing).
And yes, example 33 should be about the concert ticket, which explains it all.
Thanks for your final insight, as well.
giuseppe



> Il giorno 6 mar 2022, alle ore 12:38, Niels Klomp <nklomp@sphereon.com> ha scritto:
> 
> Hi Giuseppe,
> 
> Indeed the use case is for so called bearer credentials (
> https://www.w3.org/TR/vc-data-model/#bearer-credentials). The example of a concert ticket mentioned in there is a good one, although the actual bachelor degree example nr 33 is questionable since a degree is not subject independent.  That seems to come more from the fact that the degree is used throughout the spec as an example.
> So yes your example is a generic claim from an issuer with no ties to any subject and thus should be issued as a bearer credential.
> 
> The net result is that you can make a VP containing a bearer credential, but you can never have the holder being the subject, since there is no subject id. See also https://www.w3.org/TR/vc-data-model/#subject-is-the-holder.
> 
> Kind regards,
> 
> Niels Klomp
> 
> 
> Op 6 mrt. 2022 10:33 schreef Giuseppe Tropea <giuseppe.tropea@cnit.it>:
> dear CCG,
> in chapter "4.4 Credential Subject”, of the Verifiable Credentials Data Model v1.1, I read that "Each object MAY contain an id”.
> Can somebody clarify the use-case when the subject does NOT contain an id? As follows?:
> 
> {
>   "id": "http://example.edu/credentials/3732 <http://example.edu/credentials/3732>",
>   "type": ["VerifiableCredential", “WeatherCredential"],
>   "issuer": "https://example.edu/issuers/565049 <https://example.edu/issuers/565049>",
>   "issuanceDate": "2010-01-01T00:00:00Z",
>   "credentialSubject": {
>     “weather": {
>       “value": “it rains!"
>     }
>   },
>   "proof": { ... }
> }
> Is the above (i.e. claims that use impersonal verbs) the only indented use-case for VCs without id in the credentialSubject property?
> 
> Or am I completely off track and there is more, or a different idea altogether?
> 
> Thank you,
> giuseppe
> 
> —
> Giuseppe Tropea
> CNIT - Italy
> giuseppe.tropea@cnit.it <mailto:giuseppe.tropea@cnit.it>
> —
> 
>