Re: Proof of knowledge certs

On Fri, Jan 20, 2023 at 8:44 AM Julien Fraichot <Julien.Fraichot@hyland.com>
wrote:

> I have been investigating the possibility of having certificates which
> obfuscate PII data. That is, instead of using selective disclosure schemes
> to present a curated certificate, have the holder prove they know what the
> data is within the certificate.
>

We support this in Gordian Envelopes using "Existence Proofs":

CLI Docs:
https://github.com/BlockchainCommons/envelope-cli-swift/blob/master/Docs/8-EXISTENCE-PROOFS.md
Video: https://www.youtube.com/watch?v=LUQ-n9EZa0U

You can see an example of leveraging Existence Proofs for herd privacy in
our Educational Use Cases at:

https://github.com/BlockchainCommons/Gordian/blob/master/Envelope/Use-Cases/Educational.md#6-paul-proves-proficiency-with-improved-privacy-herd-privacy-with-non-correlation

-- Christopher Allen