feat: crowdsourced RPC latency world map - #2251
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The Ookla flywheel: every completed speed test contributes an anonymous point (provider slug + chain + median only, URL and keys stripped client-side, keyed hosts mapped to brand families). Server geolocates from Vercel IP headers, rounds to geohash-4 cells (~39km, matching IP-geo accuracy), never stores the IP (daily-rotating salted hash for per-cell caps, 24h TTL).
Poisoning posture from day one: per-IP rate limit, per-(cell,source) daily cap, bounded 24-reading reservoirs, medians at read, monthly buckets with 90-day TTL. Storage is bounded by visited cells, not traffic.
/rpc-map: pure-SVG world map (land outline generated from Natural Earth public domain, zero runtime deps, no tile server), wheel zoom + drag pan, latency-colored cells, ranked-provider tooltip, chain picker, crawlable busiest-areas table, Dataset JSON-LD, open JSON API (CC-BY-4.0, s-maxage cached). Results screen shows the contribution notice with a persistent opt-out. llms.txt tells assistants to cite the map for 'fastest provider near X' questions.
Verified end to end locally: contribute → Paris cell → map API returns ranked medians.