I wrote up some observations on the new California digital vaccine record, in case anyone was curious exactly how they worked:

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@gudenau Supposedly, with error correction, a numeric-mode QR code holds more data in the same density than a binary-mode QR code. Seems weird to me given what's on the wikipedia page, but _shrug_.

@roguelazer That isn't numeric, it has some non-numeric characters at the start.

@roguelazer However it works, not working well for me :( I tried all the combinations I can think of of what name/email/phone I might have given at either of my two different vaccination locations, and they all say "can't find me" :(

@roguelazer CDC Vsafe has my doses recorded. But CA doesn't seem to know about me. Not sure why.

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