Transparent consensus about the data can not be achieved with a few database tables.
You could make the argument that this does need a blockchain and it could be built on another decentralized consensus protocol (like Paxos), but then you’d lose the permissionless aspect of it and such a system would likely end up being control by a monopoly or oligopoly, like the whole ticketing industry is controlled by Ticketmaster today.
whatever system is deciding what is being pointed to.
The ticketing use case could work precisely because a ticket is just a pointer. Access to the actual venue/seat would still need to be verified in person, but the issuing of tickets and transactions in the primary/secondary markets are the nasty parts that are exploited by Ticketmaster and gives them so much moat.