I'm not sure in understand why building it on nostr would facilitate relational contract based reputation. Maybe something got lost in definition. Can you define this concept?
AFAIK with Nostr you have a public key that represents your "account". If you booked the house and trashed it the landlord would review you poorly which would be attached to your Nostr public key.
I do think adding Nostr in would be good, but humans are terrible at reviewing things. I take current review systems with a grain of salt, that wouldn't be any different with Nostr.
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Nostr will fix the problems of bad reviews via proof-of-tx Sybil resistance with rakes taken by relays, a bit like how StackerNews reputation works.
Look up relational contracts.
My hypothesis: nostr brings fungibility to counterparties in relational contracting so you may able to trust people based on relationships with other people almost as if that relationship had been with you the entire time.
This panning out also makes the notion of a zero government cryptoanarchic world seem vastly more plausible.
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