Blinded Authentication Tokens in Mutiny
Mutiny's unique privacy-preserving approach to solving lightning addresses with fedimint and blind authentication tokens.
https://blog.mutinywallet.com/blinded-authentication/

Mutiny has an informative blog post on exactly how they managed to add privacy to LNURLs.

They use a Fedimint gateway and issue ecash to the user to redeem using their public key, but they go further by blinding the addresses themselves! The privacy aspect is looking less like a nice-to-have and more like a necessary part with the DoJ starting to crack down