Nymchat, also known as NYM (Nostr Ynstant Messenger), is a Progressive Web App (PWA) chat messenger that uses Nostr's ephemeral events (kind 20000) for geohash-based location channels and NIP-17 encrypted events (kind 1059) for private messages. No registration required - just pick a nym and start chatting.

The thing that caught my eye about Nymchat is that they claim to have ephemeral messages.

Identities are ephemeral, which makes sense, but I was curious how they claim to achieve ephemeral messages:

It seems that it's using kind 20000, but as far as I understand this, it just means that you are kindly asking the relays not to store the events. I don't think that counts as ephemeral messaging.

Having heard that encrypted group chats are pretty difficult to do well, I'd be curious to get the opinion of someone who knows about these things.