nips/54.md

NIP-54

Topical Notes

draft optional

This NIP enables authors to post exclusively into topics, without polluting their main feed. Authors can post to locations, hashtags, labels, and urls in a way that only followers of those topics will receive their posts.

Topical Note Kind

Kind 21 defines a kind:1-equivalent event that MUST NOT be displayed unless the user follows one of the g, t, r or l tags.

{
  "kind": 21,
  "tags": [
    ["g", "<geohash>"],
    ["t", "<hashtag>"],
    ["r", "<url>"],
    //.. 
    ["L", "<label namespace>"],
    ["l", "<label>", "<label namespace>"],
  ],
  "content": "This is a note for followers of the hashtag, location OR url. My followers should not see this.",
  //...
}

.content MUST be plain text and tags that mention, quote and assemble threading structures MUST follow NIP-10.

Topical Relay Setup

Kind 30021 defines a topic follower. It registers a list of relays to aggregate events for each topic.

The d tag of this kind is equal to name:value of the topics used in kind 21.

{
  "kind": 30021,
  "tags": [
    ["d", "g:<my city's geohash>"],
    ["r", "wss://my-city-owned-relay"],
    ["r", "wss://independent-but-city-based-relay"],
    // ... other tags
    ["title", "Name of this topic"]
  ],
  "content": nip44Encrypt([
    ["r", "wss://my-city-owned-relay2"], // private relay
    ["title", "Name of this topic"] // private topic title
    // ... other tags
  ]),
  //...other fields
}

The .content contains a list of private tags.

Clients MUST seek and broadcast events from and to the relays defined for each topic.