Have you actually implemented this somewhere? (Production or testing) I’m curious to know what use cases we might expect to see in the wild in the short term if a bloom filter nip were to exist.

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Internally yes (I have not saved into events yet). All my event, address and pubkey relay hints are saved as 3 massive bloom filters. So, when the app needs to figure out which relays have given IDs, it checks the filter. Which means that I don't need to save any of the events.