But what's thr point of the PoW NIP? Is it used?
Discussion
I gave a talk explaining why proof of work could matter outside the context of bitcoin mining
Is there a NIP for doing spatial searches on Nostr? Like find everything inside a sphere on radius 100 from x,y,z? Or a cone search?
Cyberspace objects that are addressed by their event id can be searched by partial event id filters. Otherwise the primary lookup for objects is by sector id which is the S tag.
Typically spatial searches like you describe can be done by a database like Postgres, but relays don't have any such features.