Re: [EXTERNAL] [jfraichot@learningmachine.com] Multi-signature Verifiable Credentials

Hi Jack,

With Blockcerts we are supporting multiple signature. At this moment we only support chained signature, and for lack of a better option at the time, we settled with the ChainedProof2021 proposal: https://hackmd.io/@RYgJMHAGSlaLMaQzwYjvsQ/SJoDWwTdK (which comes with this issue for context: https://github.com/w3c/vc-data-integrity/issues/26).

I am not too favorable to having the previous proof redundant in the next proof and would rather see something different, especially, as you point out, that we are also hashing the previous proof in the next proof.

As for the signature suite, we are mainly using MerkleProof2019, although we do now also have support for EcdsaSecp256k1Signature2019 and Ed25519Signature2020.
Nothing is set in stone but I would be happy to see one standard emerge that would be flexible enough for everyone.

Best

Julien

From: Jack Tanner <jack@tonomy.foundation>
Date: Wednesday, 28 September 2022 at 10:08
To: public-credentials@w3.org <public-credentials@w3.org>
Cc: rebal@tonomy.foundation <rebal@tonomy.foundation>, Suneet Bendre <bendre.android@gmail.com>
Subject: [EXTERNAL] [jfraichot@learningmachine.com] Multi-signature Verifiable Credentials
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Hi CCG

Here is the presentation outlining the work that Tonomy Foundation is undertaking to allow multiple signatures and delegated signatures on verifiable credentials that I just gave at the weekly call. It uses the existing W3C CCG's verifiable condition standard to specify such conditions in the DID Document.
https://docs.google.com/presentation/d/1DsjJOfOCMhfXJgATbQAt6Ugk9Vmbq0zVrzL8thgsGVI

Please see the presentation for context. We have several questions:

  1.  What should the proof look like?
  2.  Which VC library would make the most sense for the initial implementation?

Open to hearing thoughts and opinions on the questions above.

I am pasting here if the links that Orie posted in the chat during the call:
https://github.com/OR13/did-jwk/blob/main/src/cli-examples/key.authenticity.json
https://github.com/w3c/vc-data-model/issues/762#issuecomment-1218428660
https://github.com/w3c/vc-data-model/issues/756
https://github..com/w3c/vc-data-integrity<https://github.com/w3c/vc-data-integrity>
https://github.com/w3c/vc-data-model/issues/932

Cheers,
Jack

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