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> But starting from that, can we implement what seemed to be the initial goal stated in the government's document ?

why not simply having 2 QR codes, one full, one light ... ?

Because

- People would have to know which QR to show - Organizers could get more access to data by telling users "not that QR, the other one" ?

But that would be illegal...

It's already illegal for them to take the extra information they don't need into account. That's not really the problem here I think.

What would you put in the "light" QR code ? If you put the date of the test, then the organizer can access it. If you don't, then they can't check whether your test is recent enough to be authorized to attend their event.

Like the original author states, than can't be done without a trusted 3rd party ( say a token with a service telling you whether the pass is valid at current date)

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