Europe already has a simple, secure digital vaccine passport. You get a QR code that contains your name, date of birth, and the doses you've received. It's digi

Europe already has a simple, secure digital vaccine passport. You get a QR code that contains your name, date of birth, and the doses you've received. It's digitally signed by your national government, so that it can't be faked. Nobody needs to hold a centralized database of vaccinated people. Because it's just a QR code, you can store it however you'd like. If you want, you can print it out and carry it around in your pocket. It's easy to check: you just need to read the information and check that it's digitally signed by a trusted authority (both of these can be done by an app), and check the the person listed in the QR code is the person in front of you (e.g., by asking for an ID).