NIP-F5: Population Census - #2453
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Adds NIP-F5: Population Census — a generic event kind (30789) for estimating the number of online nodes in a distributed network via probabilistic self-reporting and a Horvitz-Thompson estimator. It is application-agnostic: any mesh/P2P overlay can pick a scope label, and the estimator recovers the online population from sampled events.
The design was first deployed in fount-p2p (
discovery/nostr/census.mjs, kind 30789), and this NIP generalizes it so other networks can implement the same census without reinventing it.Key points:
30789, tagst=<scope>/x=census;contentis JSON with a single defined fieldp(inclusion probability)pubkey, an application-level signature, or anything else; readers only require a valid NIP-01 eventp, windowed sampling, HT estimatorM = Σ(1/p) − 1/p_self + 1dtag (missingdin addressable range is treated as empty-string address per NIP-01)Files changed:
F5.md(new)README.md(list + event kinds table row for 30789)Kind 30789 is also being registered in nostr-protocol/registry-of-kinds#13, alongside the fount-network transport kinds 20787/30787.