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NIP-A0
======
Voice Messages
-----------
**Status:** Draft
This NIP defines new events `kind: 1222` for root messages and `kind: 1244` for reply messages to be used for short voice messages, typically up to 60 seconds in length.
## Specification
### Event Kind `1222` and Kind `1244`
The `kind: 1222` event is defined as follows:
- `content`: MUST be a URL pointing directly to an audio file.
- The audio file SHOULD be in `audio/webm` format. Clients MAY support other common audio formats like `audio/ogg`, `audio/mp4` (m4a), or `audio/mpeg` (mp3), but `audio/webm` is recommended for broad compatibility and efficiency.
- The audio duration SHOULD be no longer than 60 seconds. Clients publishing `kind: 1222` events SHOULD enforce this limit or provide a clear warning to the user if exceeded.
- `tags`:
- Tags MAY be included as per other NIPs (e.g., `t` for hashtags, `g` for geohash, etc.).
The `kind: 1244` event is defined as follows:
- To be used for replies, `kind: 1244` events MUST follow the structure of `NIP-22`.
- `content`: MUST be a URL pointing directly to an audio file.
- The audio file SHOULD be in `audio/webm` format. Clients MAY support other common audio formats like `audio/ogg`, `audio/mp4` (m4a), or `audio/mpeg` (mp3), but `audio/webm` is recommended for broad compatibility and efficiency.
- The audio duration SHOULD be no longer than 60 seconds. Clients publishing `kind: 1222` events SHOULD enforce this limit or provide a clear warning to the user if exceeded.
- `tags`:
- Tags MAY be included as per other NIPs (e.g., `t` for hashtags, `g` for geohash, etc.).
## Visual representation with `imeta` (NIP-92) tag (optional)
The following imeta (NIP-92) tags MAY be included so clients can render a visual preview without having to download the audio file first:
- `waveform`: amplitude values over time, space separated, less than 100 values should be enough to render a nice visual
- `duration`: audio length in seconds
## Examples
### Root Voice Message Example
```json
{
"content": "https://blossom.primal.net/5fe7df0e46ee6b14b5a8b8b92939e84e3ca5e3950eb630299742325d5ed9891b.mp4",
"created_at": 1752501052,
"id": "...",
"kind": 1222,
"pubkey": "...",
"sig": "...",
"tags": [
[
"imeta",
"url https://blossom.primal.net/5fe7df0e46ee6b14b5a8b8b92939e84e3ca5e3950eb630299742325d5ed9891b.mp4",
"waveform 0 0.05 0.27 0.08 0.01 0.01 0.01 0.03 0.38 1.5 0.49 0.02 0.28 0.04 0.01 0 0 0.39 0.22 0.16 0.05 0.06 0.55 0.01 0.06 0.01 0 0 0.02 0.61 0.02 0.07 0.01 0.21 0.09 0.12 0.63 0.01 0.02 0.02 0.42 0.02 0.68 0.05 0.02 0.05 0.02 0 0 0 0",
"duration 8"
]
]
}
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