I've been to some concerts where they checked your ID vs. the credit card. In that case I imagine the scalper would have to get a card issued that scanned prop

I've been to some concerts where they checked your ID vs. the credit card. In that case I imagine the scalper would have to get a card issued that scanned properly with your name and the original number. I also remember Green Day did a show which was cash at the door only; in that case you only have line cheats who pay people to stand in line for them. I've also been to concerts where the ticket in an app locked to the phone, which could makes it harder if scalpers have to send a phone to you (though rooted phones could help.) In each of these cases you're out of luck for the show if you lose the card or phone, though it might be possible to get a refund.