This is also true for all venues through Ticketmaster (which is probably over 2/3 of them). A couple years ago, they moved from static barcodes to live, rolling

This is also true for all venues through Ticketmaster (which is probably over 2/3 of them). A couple years ago, they moved from static barcodes to live, rolling 2d barcodes that expire every 30 seconds. It does work pretty well to prevent duping/fraud, but it absolutely requires a phone to enter the venue.