if i issue you a ticket, why would I need anyone but myself to vouch for the ticket?
There are sometimes problems with corruption in ticket issuers or their middlemen. So maybe if your audience doesn’t trust you not to issue more tickets than the venue has space it could be a way to prove that isn’t happening.
Not really as good because then there’s just a chance of discovering problems if people get together and compare tickets, as opposed to the whole set of records being provably committed to, not possible to conceal after the fact, and auditable by the public.
There are sometimes problems with corruption in ticket issuers or their middlemen. So maybe if your audience doesn’t trust you not to issue more tickets than the venue has space it could be a way to prove that isn’t happening.
a sequential serial number for each ticket.
Not really as good because then there’s just a chance of discovering problems if people get together and compare tickets, as opposed to the whole set of records being provably committed to, not possible to conceal after the fact, and auditable by the public.