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

From: Manu Sporny <msporny@digitalbazaar.com>
Date: Thu, 31 Mar 2022 11:04:21 -0400
To: public-credentials@w3.org
Message-ID: <219e5219-8bc3-1b26-2086-6aea47db98a9@digitalbazaar.com>
On 3/30/22 8:11 PM, Shawn Butterfield wrote:
> Is it truly just the CBOR-LD VC Doc or is it a CBOR-LD Verifiable
> Presentation (wrapped VC) that was serialized into a QR? I'm admittedly
> "new here" so still learning, but wouldn't interoperable verification
> software need the bundle as a verifiable presentation, not the standalone
> credential?

The only QR Code format that VPQR outputs at this moment in time is a
Verifiable Presentation.

That said, there's nothing particularly wrong with encoding a VC in a QR
Code... we /could/ create a "VC1-*" QR Code format for bearer tokens (movie
tickets, venue passes, etc.). However, putting the VC in a VP costs something
like 4-8 bytes in the CBOR-LD payload, so you don't save a ton of space by NOT
putting it in a VP.

I will note that once you have an Ed25519 signature on the VC, you have around
80 bytes for payload (which is quite a bit if you're using JSON-LD types), but
is not a ton of space if you have a lot of URLs or strings in your payload.

That said, we've been able to get some pretty important VC/VP use cases
working w/ some fairly low-end scanner hardware and bad lighting conditions in
the field.

-- manu

-- 
Manu Sporny - https://www.linkedin.com/in/manusporny/
Founder/CEO - Digital Bazaar, Inc.
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https://www.digitalbazaar.com/
Received on Thursday, 31 March 2022 15:04:41 UTC

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