The combination of nostr-rs-relay nostr:npub1xhfxu35se0s63x90v8xr29txr66l5a3m277skshy2zvu3ve0658sla4xw3 and manage-relay-users nostr:npub1qjgcmlpkeyl8mdkvp4s0xls4ytcux6my606tgfx9xttut907h0zs76lgjw is f*king awesome.

It means you can spin up a relay and send it events to add npubs to a whitelist/blacklist.

This is a very powerful building block that can be used for all kinds of things, e.g. automatic spam control, paid relays, etc.