Here in Canada, it appears that we'll have vaccine passports, at least for the time being (i.e., to be repealed if/when the COVID narratives fully collapse, vaccine dangers exposed).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:

https://www.lifesitenews.com/news/quebec-to-introduce-qr-code-as-electronic-proof-for-covid-vaccination

Whistle-blower out of Manitoba:

https://www.lifesitenews.com/news/manitoba-working-on-qr-code-technology-that-could-be-used-to-track-vaccination-status

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.