We can use temporary npubs that are not linked to long-term identities and rotate them all the time. Iris.to messages already do that. The code is here: 
GitHub
GitHub - mmalmi/nostr-double-ratchet
Contribute to mmalmi/nostr-double-ratchet development by creating an account on GitHub.
SimpleX gets around the need for identities with the use of message queues. Are you talking about a similar system? Wouldn't a nostr-based messaging system ultimately rely on the npubs of the engaged parties?
View quoted note →