>Others are working on similar ideas, but many details must be worked out.

I have one.

You log into the state's web site and give them your name, DOB, and zip code
to show who you are, and the date and county where you got the shot and what
kind it was. It gives you a barcode which appears to include a cryptographic
signature that you can load into the app.

They also have a pass scanner app which looks at the barcode and says whether
it's valid and unexpired.

You don't even need a phone.  If you have access to any computer with a web
browser you can log into the site and print out a wallet card with the bar

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