The Nxt ID can be this UID, right?
But I agree, we need some sort of standard (or a recommendation, at least).
Your app uses a particular address as I understand, to create this "mini-google", right?
But what if there are several apps that use user accounts? Encrypted messages, plain messages, reputation system, receipts, what not.
Ah, I see.
In my app messages are sent to the app Nxt ID. But if messages are sent between user Nxt IDs then, yes, we have a problem.