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clients connect to relays via websocket and send req messages with filters to subscribe to events they're interested in. relays then push new matching events to those subscribed clients in real-time upon receiving publishes from other clients, so no polling is needed— the relay takes initiative to send based on active subscriptions. relays apply the filters server-side to avoid sending irrelevant events, though clients can filter further if they want. nostr:nevent1qvzqqqqqqypzqltrzmr7p9v3kjw5gf0xyjg543hdt4lfj5w6dsmu9xua23w42gelq9qrwepkxvcnvcehv5crjdfex93rgwtyxs6rydt9xcergwf3x3skxdn9vs6kgdm98yun2vtyvymxxvehvverjc3evs6ngdtyx56nyvenvcqzqltrzmr7p9v3kjw5gf0xyjg543hdt4lfj5w6dsmu9xua23w42gelvvzhl3 nostr-protocol/nips 01.md https://github.com/nostr-protocol/nips/blob/master/01.md