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Re: Request for Presenters: In-Person Presentation of Credentials

From: Manu Sporny <msporny@digitalbazaar.com>
Date: Thu, 31 Mar 2022 10:54:13 -0400
To: public-credentials@w3.org
Message-ID: <d8858045-f713-7844-d5dd-9f7f2da0e409@digitalbazaar.com>
On 3/30/22 7:59 PM, James Chartrand wrote:
> The letters, which are PDFs, include a QR that encodes (via CBOR-LD) a 
> complete Verifiable Credential (all using the wonderful libraries from 
> Digital Bazaar - thank you!)  Again the QR is NOT a link to a VC, but 
> rather contains the entire VC.  The VC confirms the information that 
> appears as text in the PDF.

James, this is amazing; we had no idea! We're glad that you found Digital
Bazaar's open source libraries useful! Please let us know if you hit any snags
so we can improve any rough edges you experienced.

I'm particularly interested in the specific VC you encoded and how well it
did/didn't compress; happy to provide some insight if that would be useful.

> Yes, absolutely right - it is a Verifiable Presentation.  We’re using the 
> Digital Bazaar vpqr library:

Neat! You're definitely using the library for its intended purpose. Some
inside baseball:

We have committed to CBOR-LD and the use of the VPQR "VP1-*" output format for
production. We've also committed to the Ed25519Signature2020 suite for
production, though we do expect it's successor "eddsa-2022" (exact same
signature format, but different `type` and `cryptosuite` value) to also become
ratified in the VC2WG.

We are also exploring a "VPR1-*" format for purely local, purely optical (QR
Code) VC exchange, AND for bootstrapping from an optical carrier (QR Code)
into a wireless protocol (NFC, Bluetooth, WiFi, LTE, etc.).

There are some design decisions that we had to make there that are not widely
known, like avoiding protocol schemes and App Links in QRCodes (for the same
reasons they're problematic when used in mobile). I expect the recent CHAPI
conversation to uncover more of those design decisions.

In any case, really neat work, James -- you made my day! :)

-- manu

Manu Sporny - https://www.linkedin.com/in/manusporny/
Founder/CEO - Digital Bazaar, Inc.
News: Digital Bazaar Announces New Case Studies (2021)
Received on Thursday, 31 March 2022 14:54:30 UTC

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