For everyone's benefit that is wondering WTF is all this 0xChat murmering:, here is my synopsis:

nostr:npub1tm99pgz2lth724jeld6gzz6zv48zy6xp4n9xu5uqrwvx9km54qaqkkxn72 is an android/ios app based on nostr. Its not a kind:1 (microblogging) oriented app, rather a chat-only program like SimpleX.

It includes 1:1 chat, group chat, and voice/video phone app and also has a built-in cashu wallet for tipping (instead of zaps). It uses your existing npub/nsec keys, or you can create a new one, but it presently does not support multiple identities. If you want to use it with multiple identities, you need to log-out and log-in with the other one.

If you use your existing npub, any previous giftwrapped chats you had in amethyst will show up. It uses giftwrap by default for PMs, but it also has another "more private" chat that I don't know anything about yet.