RE: VC Evidence Discussion

As a general pattern, consider a clear separation of the “thing” from the ownership rights and assignment of those rights to another entity (e.g. person or organization).

A VC is an obvious representation of the thing whether it be an educational achievement, an NFE in an NFT, or house (in the case of homeownership). Use a second VC to represent the ownership rights and the assignment of those rights to an actual person or organization (a verifiable capability authorization is useful for the latter).

…more or less applying the concepts of traditional database normalization to the world of VCs.

Michael

From: Kerri Lemoie <klemoie@concentricsky.com>
Sent: Thursday, April 7, 2022 11:04 AM
To: W3C Credentials CG (Public List) <public-credentials@w3.org>
Cc: public-vc-edu@w3.org
Subject: VC Evidence Discussion

Hello all,

I’m seeking some input on VC evidence. This is a topic relevant for VC-EDU because education data specifications like Open Badges and CLR may contain an evidence property to support the achievement. This evidence could be a test score, a link to an image, video, and/or web page, etc. that demonstrates competency or participation. These specs are working towards aligning with VCs and it was originally thought that this type of evidence would be included as part of the credentialSubject if it existed.

This would look something like this:

https://json.link/21SpTf0rC4


But since VCs already have an evidence property that allows for an array of evidence, it seems to make sense to use that property instead of using a separate property like the one demonstrated above. The rationalization is that VC evidence could be an array that supports what is needed for a credentialSubject to offer to support the verifiability of a VC such as a student id or it could also support the achievement that is being claimed as discussed above. This would look more like:

https://json.link/0gqe5D1U4K


Can you share your thoughts on this second approach? Do you think the VC.evidence support the achievement evidence too?

Thanks!

Kerri



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Kerri Lemoie, PhD
Director, Digital Credentials Research & Innovation
badgr.com<https://info.badgr.com/> | concentricsky.com<https://concentricsky.com/>
she/her/hers