Jeffro,
Hate to beat a dead horse, but that is not how I'm saying it would work.
A simplified example just to explain it would be to create and print a separate QR code for each circuit. They all point to the same URL, just are graphically different in looks, okay.
So the WTBTS makes a copy of each different QR code and the circuit that it went to and puts that info in a master file.
Then at some later time one of their cronies that surfs the ex jw sites sees a qr code on a scanned KM or whatever the magazine, they save that pic of the qr code that was on the ex jw site and compare it to the qr codes in the master file to see what circuit the leaker was assigned.
I know it is a stretch that they would even do this, but just wanted to clarify what I meant when I made the post. Nothing to do with the actual gathering of info from the device accessing the site using the qr code.
NJY