Hey, what about something really simple, like these? I did a sort of "protected" version of it, by only displaying them for whoever is logged in, but anyone can actually see them on the relays or by logging in npub-only.

They're obscure, but not hidden or encrypted. Relays could just agree to only serve them up for the sender or receiver.

Or were you thinking something fancier?

https://github.com/nostr-protocol/nips/pull/1988

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yes, the relay would refuse to send it to anyone not authed to the relevant npubs in the event. kind 1's specifically, so they also show up on your feed, but also have some tag that lets you filter it out or in.

the purpose of it i envision mainly for relay operators to reliably message subscribers, no matter what client they are using