You currently need to use the closed source (👎) #CovPass or #CovPassCheck to verify the validity of your own certificate (or ugh, read the spec and do it manually I guess... this seems to be collecting relevant docs: https://github.com/stealth/greenday)
If you've done that you can use #CCTG to carry around the code, or just make a photo of it, or whatever, it doesn't really matter. 🤷.
Let's hope CWA addw the verification part in one of the next versions or the CovPass sources are published...😕
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