Traffic Light System

[king1]

The verifier app isn't sending any data to or receiving any data from a central database. All it does is decode the QR code to make sure it hasn't been fiddled with. All the info is held inside the QR.

Guess they may eyeball with your pass to make sure the details match up (hey bro, how long you been an octagenarian spinster?) but they probably won't care if overseas behaviour is any indication.

although it does say HERE that it should be connected to the internet on a regular basis to ensure it can verify all valid My Vaccine Passes