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NIP-28: Public Chat (#38)
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Christopher David
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NIP-28
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======
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Public Chat
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-----------
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`draft` `optional` `author:ChristopherDavid` `author:fiatjaf` `author:jb55` `author:Cameri`
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This NIP defines new event kinds for public chat channels, channel messages, and basic client-side moderation.
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It reserves five event kinds (40-44) for immediate use and five event kinds (45-49) for future use.
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- `40 - channel create`
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- `41 - channel metadata`
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- `42 - channel message`
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- `43 - hide message`
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- `44 - mute user`
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Client-centric moderation gives client developers discretion over what types of content they want included in their apps, while imposing no additional requirements on relays.
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## Kind 40: Create channel
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Create a public chat channel.
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In the channel creation `content` field, Client SHOULD include basic channel metadata (`name`, `about`, `picture` as specified in kind 41).
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```json
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{
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"content": "{\"name\": \"Demo Channel\", \"about\": \"A test channel.\", \"picture\": \"https://placekitten.com/200/200\"}",
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...
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}
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```
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## Kind 41: Set channel metadata
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Update a channel's public metadata.
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Clients and relays SHOULD handle kind 41 events similar to kind 0 `metadata` events.
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Clients SHOULD ignore kind 41s from pubkeys other than the kind 40 pubkey.
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Clients SHOULD support basic metadata fields:
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- `name` - string - Channel name
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- `about` - string - Channel description
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- `picture` - string - URL of channel picture
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Clients MAY add additional metadata fields.
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Clients SHOULD use [NIP-10](10.md) marked "e" tags to recommend a relay.
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```json
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{
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"content": "{\"name\": \"Updated Demo Channel\", \"about\": \"Updating a test channel.\", \"picture\": \"https://placekitten.com/201/201\"}",
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"tags": [["e", <channel_create_event_id> <relay-url>]],
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...
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}
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```
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## Kind 42: Create channel message
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Send a text message to a channel.
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Clients SHOULD use [NIP-10](10.md) marked "e" tags to recommend a relay and specify whether it is a reply or root message.
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Clients SHOULD append [NIP-10](10.md) "p" tags to replies.
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Root message:
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```json
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{
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"content": <string>,
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"tags": [["e", <kind_40_event_id> <relay-url> "root"]],
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...
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}
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```
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Reply to another message:
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```json
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{
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"content": <string>,
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"tags": [
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["e", <kind_42_event_id> <relay-url> "reply"],
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["p", <pubkey> <relay-url>],
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...
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],
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...
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}
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```
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## Kind 43: Hide message
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User no longer wants to see a certain message.
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The `content` may optionally include metadata such as a `reason`.
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Clients SHOULD hide event 42s shown to a given user, if there is an event 43 from that user matching the event 42 `id`.
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Clients MAY hide event 42s for other users other than the user who sent the event 43.
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(For example, if three users 'hide' an event giving a reason that includes the word 'pornography', a Nostr client that is an iOS app may choose to hide that message for all iOS clients.)
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```json
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{
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"content": "{\"reason\": \"Dick pic\"}",
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"tags": [["e", <kind_42_event_id>]],
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...
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}
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```
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## Kind 44: Mute user
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User no longer wants to see messages from another user.
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The `content` may optionally include metadata such as a `reason`.
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Clients SHOULD hide event 42s shown to a given user, if there is an event 44 from that user matching the event 42 `pubkey`.
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Clients MAY hide event 42s for users other than the user who sent the event 44.
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```json
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{
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"content": "{\"reason\": \"Posting dick pics\"}",
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"tags": [["p", <pubkey>]],
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...
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}
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```
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## NIP-10 relay recommendations
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For [NIP-10](10.md) relay recommendations, clients generally SHOULD use the relay URL of the original (oldest) kind 40 event.
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Clients MAY recommend any relay URL. For example, if a relay hosting the original kind 40 event for a channel goes offline, clients could instead fetch channel data from a backup relay, or a relay that clients trust more than the original relay.
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Future extensibility
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--------------------
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We reserve event kinds 45-49 for other events related to chat, to potentially include new types of media (photo/video), moderation, or support of private or group messaging.
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Motivation
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----------
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If we're solving censorship-resistant communication for social media, we may as well solve it also for Telegram-style messaging.
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We can bring the global conversation out from walled gardens into a true public square open to all.
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Additional info
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---------------
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- [Chat demo PR with fiatjaf+jb55 comments](https://github.com/ArcadeCity/arcade/pull/28)
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- [Conversation about NIP16](https://t.me/nostr_protocol/29566)
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