Since Nostr is public on relays and nutzaps are recognizable across clients, is there still a way to encrypt the amount so that your balance is private? 

Will this tool only be useful for public zapping between npubs? 

 wallet balances are private; whatever you deposit in your wallet is private, and nutzaps themselves can be made private too -- right now I only implemented the public version 

 nice. private nutzaps can't be publicly verified I suppose? 

 id rather let my nutzaps hang out in public