Tickets are issued to a name and are confirmed at entry with photo ID, just like with an airline ticket.

There's a few ways to do this. At the other commenter said you can attach a name and require ID at the door. ID could be as common as a credit card or a school ID or even an official piece of mail. All this is less invasive than biometrics and more reliable too. Biometrics are always for convenience and not security.

If you want to get extra cautious, sell tickets at the booth for an hour or two before the doors open and up until the beginning of the show. The ticket comes in the form of a paper wristband, like they use for alcohol, and you can pay cash.

Want to buy a ticket for your friend? Use their legal name and then they show ID at the door. There's paranoid as you? Send them cash.

There's another option. You can buy tickets for yourself and any number of companions. Only the purchaser has to show ID, and the entire party has to come in with the purchaser.

There. And now you didn't have to give Sam Altman legal authority to store and resell your biometric data to private surveillance networks and retail shops in exchange for seeing Taylor Swift live.