Yes, of course. 

 Keychat use seed phrase, not nsec. 

 It's actually good it does not use the key used for posting, but it would be cool if we could publish a signed note that ties the normal npub to the keychat identity for discovery. If I added someone to Nostr, having an option to write to them without exchanging some contact information would be good. 

They can write me Nostr DM anyway.

But then this could also work for SimpleX and others, essentially rebuilding the identity part of keybase, which was quite a good idea. No need of web of trust if you already got a social reputation - a website, GitHub account, PGP key, Twitter account, ...

Nostr could be the thing that ties it up and does not rely on Keybase corporation which was acquired by Zoom and more or less stopped working on the project. 

 Cool, thank you, that makes sense. 

Three more questions if you want to answer
 - can I use my own relay? 
 - how would you compare keychat to SimpleX and Signal? When would you use which?
 - groups support?

I'm going to set it up, play with it and update:

https://juraj.bednar.io/en/blog-en/2022/05/03/encrypted-messengers-comparison/ 

 1、yes, of course.  see below note.

nostr:note15sza0s4yrxzx35cn3cs5xarxd48h7tgc5eyy4x0ml98jqfrk92gswyvhc8

2、 see below note 

nostr:note186wfn3zdrds9g3k2rgqxtzxxr3azfzr3vz6aa68c52kns7wqpduspmk2hh

3、yes, two kinds of group. 

nostr:note1927pnd00l22umju9xldyjc3xsrhn28tk0rxczn50pygwaft5h8kqcex9y9 

 The biggest difference is that Keychat's one-on-one chats have forward secrecy, meaning that if your key file is compromised, hackers cannot decrypt your past or future messages. In contrast, 0xchat's default message encryption (Gift-Wrapped DM) does not have forward secrecy.

“0xchat Secure DM

Currently, we support three types of direct messages (DMs), Please review the provided links for a deeper understanding of each DM type:

NIP-04 DM
NIP-04 DM is the most widely used DM type in nostr, but it is not our recommended option currently because NIP-04 is not private in terms of DMs. Even though the content is encrypted, it leaks a lot of metadata. We do not use this DM type by default but are compatible with NIP-04 DM from other nostr clients.

Gift-Wrapped DM
Gift-Wrapped DM is our default and recommended DM type. By using Gift-Wrapped for event messages, it minimizes metadata leakage. Not only is the message content encrypted, but the sender and the timestamp are also concealed. Moreover, the encryption algorithm employed is the latest audited NIP-44 algorithm.

Secret DM
Secret Chat is our third DM type, an extension of the Gift-Wrapped DM. Since Gift-Wrapped DM does not support forward secrecy, if a user's private key is compromised, all DM messages could be recovered. Therefore, we added a NIP-101 key exchange protocol to ensure each message session uses a different receiver key, securing forward secrecy. Additionally, we have incorporated the option to select a fixed relay for these sessions, allowing messages to be transmitted through a single trusted relay for both parties.”


https://github.com/0xchat-app 

 Thanks!  

 For accessibility reasons you should plan on making an setting for "stamped messages only" though.  

 Users just need to disable the free relay on the settings page, and they will not receive messages without stamps. 

 But do they still need stamps to send? 

 The scenario you envision is that a user does not receive messages without stamps, but the messages they send also do not have stamps? Keychat can control relays more precisely. For example, users can separately set the sending relay and the receiving relay. They can set the receiving relay to a paid relay and the sending relay to a free relay. Of course, this also requires the consent of your chat partner. 

 Yes that's what I meant. That was good planning on your half 👍 

 I'd sell that as the main feature then

Not the privacy stuff, but trying to promote a high quality, open discussion environment 

A solution to the dilemma certain people have with "I want people to have free speech, but it's hard to deal with every thought everyone has, so I want a platform that limits discussion based on quality"  

 Additionally, many people are paying for so-called free chat apps with their private data. There's no such thing as a free lunch in the long run. 

 We will be more optimistic because we believe that more and more people will own Bitcoin. 

 BTW, Keychat users can also use free relays, like the Damus relay.