nips/0a.md

NIP-0a

Audio Events

draft optional

This NIP defines several new event kinds representing different types of audio track. These events are parameterized replaceable as defined in NIP-01 and deletable per NIP-09.

Unlike a kind 1 event with audio attached, audio events are intended to be surfaced in an audio-specific context rather than in a general micro-blogging context.

The following kinds are defined by this NIP:

• 31337 represents a music track
• 31338 represents a podcast episode

The following tags are required:

• d is a unique identifier randomly generated by the client.
• media is the url of the media. This SHOULD NOT be read, but is required for backwards compatibility reasons.
• imeta is as described in NIP 92. Multiple imeta tags MAY be included to provide for different use cases (e.g. streaming vs download).
• title is the title of the audio track
• subject is the title of the audio track (deprecated, but required for compatibility)

The following tags are optional:

• i is an external GUID in the format defined here.
• c is the track's value as defined by a given category.
• website is an external url to a website related to the track.
• duration is the duration of the audio track, in seconds.
• published_at is a timestamp representing the track's original publish date.

Expected categories may include (but are not limited to):

• genre
• subgenre
• artist
• record_label
• producer
• composer
• album
• track_number
• tracks
• bpm
• year

Note that artists, producers, SHOULD be referred to using both a plaintext c tag AND a conventional p tag when pubkey is available. When doing so, the p tag's petname MUST be the same as the c tag's value. In this way c tags can be used to indicate genre, as well as artist, producer, etc.

If included, genre and subgenre SHOULD be based on this list.

content SHOULD be summary or description of the audio content.

Example:

{
  "id": <event_id>,
  "pubkey": <author_pubkey>,
  "created_at": <created_at>,
  "kind": 31337,
  "content": "Chill beats",
  "tags": [
    ["d", "<id>"],
    ["c", "Pop", "genre"],
    ["c", "EDM", "subgenre"],
    ["c", "Columbia Records", "record_label"],
    ["c", "AC/DC", "artist"],
    ["i", "podcast:item:guid:123", "https://fountain.fm/episode/30uEXC25615Ze2ELjY2p"],
    ["p", "2a07724d42fd8004b5c97b62ba03b6baf3919f9e8211667039987866997e97ad", "wss://my-relay.com", "AC/DC"],
    ["title", "Platinum Robots on the Moon"],
    ["subject", "Platinum Robots on the Moon"],
    ["published_at", "<published_at>"],
    ["imeta", "url https://example.com/my-track.m3u8", "x <hash>", ...]
  ]
}