We now support three types of DM, normal DM, Nip4 ; Gift-wrapped DM, Nip24; and secret chat. 

https://github.com/vitorpamplona/nips/blob/sealed-dms/24.md

https://github.com/0xchat-app/0xchat-core/blob/main/doc/secretChat.md 

 Wow, job well done.