very cool! I'll try it out for some event I'll organize.
I was thinking a sort of proto ticketing system with transferability could be just an instance of a cashu mint, disconnected from lightning or other mints. then a 1sat note could be the ticket. it could be exchanged for a new note easily in case of resale to prevent fraud.
I was thinking integrating it with btcpayserver somehow.
or if the ticket has a fixed price you could actually mint it yourself over lightning, but can't transfer out.