Private chats and groups liveness pulse

[kehiy]

This issue a is place to discuss about features that makes the private and groups chats feels real-time and live. Example of these are:

• received: a check mark that shows your message is received by receiver(s).
• seen: a double check mark that shows your message is received and seen by receiver (which means they have read the message). A not received message can't be marked as seen.
• online: which will be shown on user profile and indicates they are connected to some relays same that you can send you messages and they will see the notification (If we apply this using an event or something like that, we can use the created_at diff with now to define a last seen too).
• typing, selecting_emoji/sticker/image/video/gif, recording_voice/video, and other similar statues that can be shown at same place as online sign but only to parties on that specific chat. We can't show them when user is not online.

The ideal solution MUST be privacy friendly any way that user can take control over them and disable any of them if they want. Or select who can see them.

Clients MAY use these out of chat apps too.

these PRs are current workarounds:

• NIP-17: "seen" event #1994
• NIP-17: Mark as Received event #2000
• nip-17: support seen events. #1761

If you think I missed any PRs/issues, add a comment and I'll add it.

[kehiy]

Some previous workarounds:

• We can use bloom filters of event IDs to indicate seen and received.
• We can use a unix timestamp of last received/seen message to indicate seen and received.
• We can use an event containing seen/received message IDs.
• We can use some kind of status events to show online, typing, selecting_emoji/sticker/image/video/gif, recording_voice/video.

These are just a summery of those other PRs and discussions on them.
If you think I missed any PRs/issues, add a comment and I'll add it.

[kehiy]

cc @vitorpamplona @wcat7 @erskingardner @reyamir @Giszmo @staab

[Giszmo]

Not sure why you poked me. Seen by timestamp is not stable as nostr isn't consistent and people will inevitably skip events when things get busy and broadcasting event IDs to track "seen" status is also a bit overkill for most but I see how on small groups that can be worth it.
Typing/Recording/Status updates should be done via ephemeral events.