Ok, here are your requirements:
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A ticket exchange that provides permission less access and trust less verification of ticket authenticity and ownership (we should be free to use independent exchange services).
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Tickets must be transferable between parties without intermediary controlling and approving exchanges (or you're just the new middleman).
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Rules around issuing tickets, resales, and revocation must be enforceable transparently.
Good luck friend. LMK what you come up with. I think what might be more productive to the conversation is if you state which of these requirements is not important (and why it is not important) because I can guarantee you can't make a system that meets these without a blockchain-esque system.
FWIW, if you don't understand why blockchain technology is unique, in that it can solve problems NOT POSSIBLE with other technology, then you haven't studied it enough. There are tradeoffs of course when designing systems, including efficiency and cost, etc. which makes blockchain irrelevant for 99% of system designs. But that doesn't mean the technology is not unique.