Doorman points the phone, the QR reads, the ticket validates, guest in. The line moves. Used ticket? Big red X with the time it was first scanned.
Seconds from raised phone to guest moving past the rope. Name and tier right on the screen. No paper list, no scribbled name spelling.
The door screen validates every scan online, over WiFi or mobile data, and shows the connection clearly. If the signal drops, scanning pauses and resumes on its own when it's back. Test the signal at the entrance before doors open — use mobile data or a repeater if WiFi is weak there.
Door host can sell a walk-up a ticket and check in guest-list names right from the door screen. Pick the tier, done. They're on tonight's list with everyone else.
Who checked in, who scanned, which door, exact second. Duplicates and denies logged too. Next morning: review the line, find the lost ticket, close out the night.
Fast QR scans. Duplicates caught. Walk-ups sold at the rope. Audit log that writes itself. The line doesn't queue twice.