There are a lot of corner cases. What if I want to give some of the tickets to a friend who has to arrive late and meet me inside the venue? What if I want to do legitimate reselling on a website like Stubhub (many events encourage this even, like reselling sports tickets if you can’t make it, so that the seat doesn’t go empty and the stadium can make money on concessions... this happens all the time if you’re a season ticket holder for a particular team; you just frequently can’t make it and need to resell).

Personally I wish tickets were just bearer bonds. If you have the paper ticket in your hand, you get in, all else be damned.

Then to solve scalping or bots, try to invent solutions that offer tickets to verified long-time fans / supporters first, then use a pre-registered (not day-of) lottery system to allow general purchases.