Currently, each country does its own QR thing, a fair amount of which is just a link to some .gov.* website. Unifying it under one model makes sense. It makes i

Currently, each country does its own QR thing, a fair amount of which is just a link to some .gov.* website. Unifying it under one model makes sense. It makes it easier to verify and issue new EU QR codes. Otherwise, when presented with a proof, verifiers would have to know how to properly verify 20+ different QR codes. So we've got two realistic options: 1) non-EU countries teach people their own and the EU verification method, or 2) non-EU countries offer a way to "convert" EU QR scheme to their own at the point of entry. It's similar the other way around as well, because non-EU countries could either start issuing EU-compatible QR codes, or recepients could "convert" them to the EU-compatible QR code at the point of entry.