Not that I know of, but it could definitely be done
#asknostr
Is there such a thing as password-protected notes in nostr? nostr:nprofile1qythwumn8ghj7anfw3hhytnwdaehgu339e3k7mf0qyghwumn8ghj7mn0wd68ytnhd9hx2tcpzpmhxue69uhkummnw3ezumt0d5hsqgzxpsj7dqha57pjk5k37gkn6g4nzakewtmqmnwryyhd3jfwlpgxtsf4t65r , nostr:nprofile1qyvhwumn8ghj76r0v3kxymmy9ehx7um5wgcjucm0d5hszymhwden5te0wp6hyurvv4cxzeewv4ej7qg6waehxw309ac8junpd45kgtnxd9shg6npvchxxmmd9uqzp978pfzrv6n9xhq5tvenl9e74pklmskh4xw6vxxyp3j8qkke3cez3gqf4s , anybody know?
Discussion
I would think there's definitely a use case for it
E.g., a person posts a #Cashu token in a note but doesn't want anyone else to see it unless they have the password for that note
... or are there other ways to protect against the discoverability of Cashu tokens?
really it would be a client side protocol, mostly...