Those living in Ontario can now get their official proof of vaccination certificates, or at least will be able to within the next few days, depending on month of birth. They are staggering access to prevent overloading their servers.
The way it works is a bit confusing. This is NOT an app that you download. The Verify Ontario app is the thing used by businesses to verify vaccination status by scanning a QR code. The actual certificate with your unique QR code is just a digitally signed PDF file that you can download from the same Health Ontario website and with the same credentials where you booked your original appointments (it also works if you got your shots at a pharmacy or a walk-in mass clinic). You can either print it and/or transfer it to your phone.
I have no idea how secure this certificate is against forgery, but the QR footprint is huge and undoubtedly contains a lot of authenticity checks known only to the validating app. A forger could copy the entire QR code but then it wouldn’t match the user’s identity info. I suppose this may eventually be supplanted by a more secure federally issued digital document.