Why is kind 20000 necessary? Isn't the geohash separate from that, like just a tag that goes onto other notes?
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Afaict, kind 20000 is used in order to utilise 'ephemeral events'
See:

See:

NIPs
NIP 1 - Basic protocol flow description — Nostr Implementation Possibilities
This NIP defines the basic protocol that should be implemented by everybody. New NIPs may add new optional (or mandatory) fields and messages and f...