"I have never yet seen a system that cannot be beat by scalpers"
easy, ID linked tickets that you pick up after entering the venue and get transacted at that point, and you cannot reenter.
easy, ID linked tickets that you pick up after entering the venue and get transacted at that point, and you cannot reenter.
What I would try is a "credit card required at entry", so at the gate the only person who gets is the one who inserts the (valid) CC# that was used to buy the ticket.