As far as I know, Amethyst DM uses NIP-17 and does not have forward secrecy. The default DM in 0xchat also uses NIP-17 and lacks forward secrecy. However, 0xchat has a "Secret chat" mode that can be manually enabled, where both parties exchange Alias Keys and then use NIP-17. This type of secret chat offers some level of forward secrecy. View quoted note →