3. What relays do (and what they don't do).
Relays are simple servers that receive, store, and forward events. They accept signed events from clients, save them, and serve them to other clients that request them via filter queries. What they don't do: they don't verify the content's meaning, they don't control your identity, and they can't forge your signature. A relay can choose to drop or reject events (they have their own policies), but since you broadcast to multiple relays, one relay refusing you doesn't silence you.
Relays are simple servers that receive, store, and forward events. They accept signed events from clients, save them, and serve them to other clients that request them via filter queries. What they don't do: they don't verify the content's meaning, they don't control your identity, and they can't forge your signature. A relay can choose to drop or reject events (they have their own policies), but since you broadcast to multiple relays, one relay refusing you doesn't silence you.