really? I already use axs and ticketmaster apps for tickets. Are you using pdfs or something? The app is nice because it rotates the barcode every minute, and idk how else you'd achieve that. I guess a webapp could work.

I don't think you need to rely on device fingerprinting, just make sure they're logged into their ticketing account. You might see people start to sell accounts with single/pair tickets but that just sounds like a pain, and we could mitigate it if it becomes a problem.