W3C home > Mailing lists > Public > public-credentials@w3.org > December 2019

Re: Verifiable Credential Greeting Cards

From: Dan Burnett <daniel.burnett@consensys.net>
Date: Mon, 9 Dec 2019 10:37:37 -0500
Message-ID: <CAJ-gw3GjmVGY3viayQoHddR5askTqCz1_am9Rhpxw719D0xH_w@mail.gmail.com>
To: "Michael Herman (Parallelspace)" <mwherman@parallelspace.net>
Cc: Orie Steele <orie@transmute.industries>, "W3C Credentials CG (Public List)" <public-credentials@w3.org>
Based on Orie's definition of FROM and TO (which I mistakenly capitalized
as  'From' and 'To'), my statement is correct in terms of the intent his VC
expresses.


On Sat, Dec 7, 2019 at 4:20 PM Michael Herman (Parallelspace) <
mwherman@parallelspace.net> wrote:

> RE: As presented, the VC says that the From claims that the To has a
> greetingCard property with certain values.
>
>
>
> Again, I think the interpretation should be that “there is an Issuer (who
> happens to be the same entity as From) that is asserting that there is a
> verifiable credential of type GreetingCard … with the following list of
> Claims”.
>
>
>
>     "greetingCard": {
>
>       "type": "HolidayCard",
>
>       "image": "http://i.imgur.com/SxtVfyQ.jpg",
>
>       "message": "Happy Holidays!",
>
>       "from": "did:key:z6MkobeddxBBkCWdXZP7bAbTnjuJ9wmKPi8zzA1WwQtCCQRr",
>
>       "to": "did:example:123"
>
>     }
>
>
>
> I believe this is the most you can infer from reading the JSON (and not
> extrapolating beyond what’s in the JSON).  There is nothing to imply “To
> has a greetingCard property”?
>
>
>
> Michael
>
>
>
> *From:* Dan Burnett <daniel.burnett@consensys.net>
> *Sent:* December 5, 2019 10:21 AM
> *To:* Orie Steele <orie@transmute.industries>
> *Cc:* Michael Herman (Parallelspace) <mwherman@parallelspace.net>; W3C
> Credentials CG (Public List) <public-credentials@w3.org>
> *Subject:* Re: Verifiable Credential Greeting Cards
>
>
>
>
>
>
>
> On Wed, Dec 4, 2019 at 5:30 PM Orie Steele <orie@transmute.industries>
> wrote:
>
> Thanks for the feedback!
>
> I based the structure on:
> https://www.w3.org/TR/vc-data-model/#example-7-specifying-multiple-subjects-in-a-verifiable-credential
>
> I thought of a greeting card as a VC with the Issuer being the FROM and
> the subject being the TO.
>
>
>
> This is a fun example, but perhaps not best representative of the intended
> use for VCs.  The VC model is that "an Issuer makes Claims about a Subject,
> and includes a Proof (signature) that they did so".  So what are you trying
> to prove? :)
>
>
>
> As presented, the VC says that the From claims that the To has a
> greetingCard property with certain values.
>
>
> After your comments, I'm not sure what I have done is correct.
>
> I have updated the demo to correct some missing fields and tested on
> jsonld playground. Is this more what people were expecting?
>
>
> OS
>
> {
>
>   "@context": [
>
>     "https://www.w3.org/2018/credentials/v1",
>
>     "https://transmute-industries.github.io/vc-greeting-card/context/vc-greeting-card-v0.0.jsonld"
>
>   ],
>
>   "id": "https://example.com/credentials/1872",
>
>   "type": [
>
>     "VerifiableCredential",
>
>     "GreetingCard"
>
>   ],
>
>   "issuer": "did:key:z6MkobeddxBBkCWdXZP7bAbTnjuJ9wmKPi8zzA1WwQtCCQRr",
>
>   "issuanceDate": "2019-12-04T22:20:39.285Z",
>
>   "credentialSubject": {
>
>     "id": "did:example:123",
>
>     "greetingCard": {
>
>       "type": "HolidayCard",
>
>       "image": "http://i.imgur.com/SxtVfyQ.jpg",
>
>       "message": "Happy Holidays!",
>
>       "from": "did:key:z6MkobeddxBBkCWdXZP7bAbTnjuJ9wmKPi8zzA1WwQtCCQRr",
>
>       "to": "did:example:123"
>
>     }
>
>   },
>
>   "proof": {
>
>     "type": "Ed25519Signature2018",
>
>     "created": "2019-12-04T22:20:39Z",
>
>     "jws": "eyJhbGciOiJFZERTQSIsImI2NCI6ZmFsc2UsImNyaXQiOlsiYjY0Il19..TO7wGkMcM-Ey2h2I2GMRsOAQ8r9xPL7mDEkPefuYmUy32lYhRuS0AiNjcIpYYkWil8RvITmnpb2syqDgpPgsAg",
>
>     "proofPurpose": "assertionMethod"
>
>   }
>
> }
>
>
>
>
>
> ᐧ
>
>
>
> On Tue, Dec 3, 2019 at 3:05 PM Michael Herman (Parallelspace) <
> mwherman@parallelspace.net> wrote:
>
> Orie, I have a follow-up question regarding the value of the *id*
> attribute in the *credentialSubject* (line 14).
>
>
>
> In the current implementation, the value of the *credentialSubject*’s *id*
> attribute is the value of the *to* attribute, the subject/entity the
> greeting card is addressed to.
>
>
>
> Is this correct?  …this is a credential about a specific *greeting card*
> – that is, the greeting card is the subject of this credential, n’est pas?
>
>
>
>
>
> I think the corrected version of this greeting card should look like this…
>
>
>
>
>
> *From:* Orie Steele <orie@transmute.industries>
> *Sent:* December 2, 2019 8:16 AM
> *To:* W3C Credentials CG (Public List) <public-credentials@w3.org>
> *Subject:* Verifiable Credential Greeting Cards
>
>
>
> I've been working on some supporting documentation regarding JSON-LD
> Contexts, extending them and hosting your own, as well as interop with
> did:key.
>
> If you are interested in creating custom credential formats for new use
> cases, this demo may be of use to you.
>
> https://transmute-industries.github.io/vc-greeting-card/
>
> Here is a VC Greeting card for this list, happy holidays:
> https://transmute-industries.github.io/vc-greeting-card/?vcgc=eyJAY29udGV4dCI6WyJodHRwczovL3d3dy53My5vcmcvMjAxOC9jcmVkZW50aWFscy92MSIsImh0dHBzOi8vdHJhbnNtdXRlLWluZHVzdHJpZXMuZ2l0aHViLmlvL3ZjLWdyZWV0aW5nLWNhcmQvY29udGV4dC92Yy1ncmVldGluZy1jYXJkLXYwLjAuanNvbmxkIl0sImlkIjoiaHR0cHM6Ly9leGFtcGxlLmNvbS9jcmVkZW50aWFscy8xODcyIiwidHlwZSI6WyJWZXJpZmlhYmxlQ3JlZGVudGlhbCIsIkdyZWV0aW5nQ2FyZCJdLCJpc3N1ZXIiOiJkaWQ6a2V5Ono2TWt0ZVgyVkIydFVuaUJRRFBHeHZBZ3AxcldkVUFoS2pZUzI3blFRdFYxUFY4aSIsImlzc3VhbmNlRGF0ZSI6IjIwMTktMTItMDJUMTU6MDg6MzcuNzUxWiIsImNyZWRlbnRpYWxTdWJqZWN0Ijp7ImlkIjoicHVibGljLWNyZWRlbnRpYWxzQHczLm9yZyJ9LCJncmVldGluZ0NhcmQiOnsiaW1hZ2UiOiJodHRwOi8vaS5pbWd1ci5jb20vU3h0VmZ5US5qcGciLCJtZXNzYWdlIjoiSGFwcHkgSG9saWRheXMhIiwiZnJvbSI6ImRpZDprZXk6ejZNa3RlWDJWQjJ0VW5pQlFEUEd4dkFncDFyV2RVQWhLallTMjduUVF0VjFQVjhpIiwidG8iOiJwdWJsaWMtY3JlZGVudGlhbHNAdzMub3JnIn0sInByb29mIjp7InR5cGUiOiJFZDI1NTE5U2lnbmF0dXJlMjAxOCIsImNyZWF0ZWQiOiIyMDE5LTEyLTAyVDE1OjA4OjM4WiIsImp3cyI6ImV5SmhiR2NpT2lKRlpFUlRRU0lzSW1JMk5DSTZabUZzYzJVc0ltTnlhWFFpT2xzaVlqWTBJbDE5Li4zVnhQUm9tVWZkQ0NGR0t2U1lyY2lQc2p4aENIeTQ5Q1dVY3E2UE5YSy1wZkk5bW9mQlpCcjc4NUpmWW1QSVpIRHBBbmxqQ1d5TVJXX0hrd2xNNFpEUSIsInByb29mUHVycG9zZSI6ImFzc2VydGlvbk1ldGhvZCJ9fQ
>
> OS
>
>
>
> --
>
> *ORIE STEELE*
>
> Chief Technical Officer
>
> www.transmute.industries
>
>
>
> <https://www.transmute.industries>
>
> ᐧ
>
>
>
>
> --
>
> *ORIE STEELE*
>
> Chief Technical Officer
>
> www.transmute.industries
>
>
>
> <https://www.transmute.industries>
>
>

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Received on Monday, 9 December 2019 15:37:57 UTC

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