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What Concord asks of a Nostr relay: why NIP-17 inbox relays are incompatible, what happens when relays prune or expire events, how invites work, and other consequences of its key-derived design.
What the relay can see, how spam gets stopped, and whether push notifications work — the same three questions asked of both nostr group-chat designs, and the different strengths each buys with its foundational bet.
