README: sponsor attribution is last touch

README.md

@@ -8,7 +8,7 @@ Node server (RM Circle pattern): static pages + JSON API + SSE ledger.
 - `server.js` — http server: pages, `/api/*`, `/join/<id>` sponsor links, SSE feed
 - `chain.js` — contract reader + persistent event indexer (free public RPCs)
 - `auth.js` — SIWE wallet sign-in (EIP-4361), sessions in the volume
-- `accounts.js` — site-side records only (free members, first-touch sponsor
+- `accounts.js` — site-side records only (free members, last-touch sponsor
   attribution, handles). The CHAIN is the source of truth for money/credits.
 - `public/` — landing, live ledger, member area; no client libraries