ClockLink.com provides the most widely used online clocks in the world and their newest range includes a clock with a QR Code face (image below). The QR Code resolves to http://www.scannedcards.com but wouldn’t it be better if users could generate their own codes for the clock face?
Even better if the QR code encoded the time (to the nearest minute) and a pre-determined code, or location.
Could be used to verify that you had visited a specific location at a specific time.
Good for treasure-hunts and security staff making patrols.
@gonzo Yep, good idea.