Here in Canada, it appears that we'll have vaccine passports, at least for the time being (i.e., to be repealed if/when the COVID narratives fully collapse, vaccine dangers exposed).
These will use QR technology it seems, if the following stories are any indication.
Quebec:
Whistle-blower out of Manitoba:
This might have some functional issues (i.e., not everyone has a smart phone), in which case, I would assume they would require paper copies.
Someone on another one of the .win forums made a good point about vaccine passports though, the point isn't functionality, it's obedience/conditioning.
If/when vaccine passports comes to some states in the US, wouldn't be surprised if they go down a similar path of using QR codes.
I don't believe it is anymore than a ploy to get more people to vaccinate. Any vaccine passport issued by a government would be a crime against humanity according to the Nuremburg code. Corporations requiring an experimental drug for employment also become liable for any injuries suffered. The narrative will fall apart completely before this can occur IMHO.