RE: Verifiable Credential Greeting Cards

p.s. This VC discussion is related/similar to the following thread(s) about drivers licences and vehicle registration decals.  The “devil is in the details” …

https://twitter.com/mwherman2000/status/1191398065090920455

From: Michael Herman (Parallelspace)
Sent: December 5, 2019 9:41 AM
To: Orie Steele <orie@transmute.industries>
Cc: W3C Credentials CG (Public List) <public-credentials@w3.org>
Subject: RE: Verifiable Credential Greeting Cards

Orie, I don’t actually know what the correct answer is either (the VC specification is not clear in this regard).  There is actually 3 potential credentialSubjects: the requester/sender and the recipient/receiver as well as the GreetingCard itself.

If this particular VC only specifies a single credentialSubject, I think it would have to be the ID of the GreetingCard itself.

Michael

From: Orie Steele <orie@transmute.industries<mailto:orie@transmute.industries>>
Sent: December 4, 2019 3:28 PM
To: Michael Herman (Parallelspace) <mwherman@parallelspace.net<mailto:mwherman@parallelspace.net>>
Cc: W3C Credentials CG (Public List) <public-credentials@w3.org<mailto:public-credentials@w3.org>>
Subject: Re: Verifiable Credential Greeting Cards

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.

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"

  }

}




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On Tue, Dec 3, 2019 at 3:05 PM Michael Herman (Parallelspace) <mwherman@parallelspace.net<mailto: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?

[cid:image003.jpg@01D5AB51.7B1C4A90]

I think the corrected version of this greeting card should look like this…

[cid:image004.jpg@01D5AB51.7B1C4A90]

From: Orie Steele <orie@transmute.industries<mailto:orie@transmute.industries>>
Sent: December 2, 2019 8:16 AM
To: W3C Credentials CG (Public List) <public-credentials@w3.org<mailto: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=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


OS

--
ORIE STEELE
Chief Technical Officer
www.transmute.industries<http://www.transmute.industries>

[https://drive.google.com/a/transmute.industries/uc?id=1hbftCJoB5KdeV_kzj4eeyS28V3zS9d9c&export=download]<https://www.transmute.industries>
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--
ORIE STEELE
Chief Technical Officer
www.transmute.industries<http://www.transmute.industries>

[https://drive.google.com/a/transmute.industries/uc?id=1hbftCJoB5KdeV_kzj4eeyS28V3zS9d9c&export=download]<https://www.transmute.industries>