https://sovereign.app/ (afaik a modified nip-60 by nostr:nprofile1qqsxkxud4s60l3sagexlamcquj5y5czwzuh0vwglkc5jj0t0zenpfrqprdmhxue69uhkx6rjd9ehgurfd3kzumn0wd68yvfwvdhk6qgdwaehxw309ahx7uewd3hkcqg5waehxw309aex2mrp0yhxgctdw4eju6t0pz6090 - maybe compatibility should/can be achieved) 

 Before we make NIP-60 the standard, I would love to work with @PABLOF7z to simplify the current spec in a couple of ways