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NIP-68
======
Picture-first feeds
-------------------
`draft` `optional`
This NIP defines event kind `20` for picture-first clients. Images must be self-contained. They are hosted externally and referenced using `imeta` tags
Unlike a `kind 1` event with a pircture attached, Picture events are meant to contain all additional metadata concerning the subject media and to be surfaced in picture-specific clients rather than general micro-blogging clients. The thought is for events of this kind to be referenced in a Instagram/Flickr/Snapshat/9gag like nostr client where the picture itself is at the center of the experience.
## Picture Events
Picture events contain a `title` tag and description in the `.content`.
They may contain multiple images to be displayed as a single post.
```jsonc
{
"id": <32-bytes lowercase hex-encoded SHA-256 of the the serialized event data>,
"pubkey": <32-bytes lowercase hex-encoded public key of the event creator>,
"created_at": <Unix timestamp in seconds>,
"kind": 20,
"content": "<description of post>",
"tags": [
["title", "<short title of post>"],
// Picture Data
[
"imeta",
"url https://nostr.build/i/my-image.jpg",
"m image/jpeg",
"blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
"dim 3024x4032",
"alt A scenic photo overlooking the coast of Costa Rica",
"x <sha256 hash as specified in NIP 94>",
"fallback https://nostrcheck.me/alt1.jpg",
"fallback https://void.cat/alt1.jpg"
],
[
"imeta",
"url https://nostr.build/i/my-image2.jpg",
"m image/jpeg",
"blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
"dim 3024x4032",
"alt Another scenic photo overlooking the coast of Costa Rica",
"x <sha256 hash as specified in NIP 94>",
"fallback https://nostrcheck.me/alt2.jpg",
"fallback https://void.cat/alt2.jpg",
"annotate-user <32-bytes hex of a pubkey>:<posX>:<posY>" // Tag users in specific locations in the picture
],
["content-warning", "<reason>"], // if NSFW
// Tagged users
["p", "<32-bytes hex of a pubkey>", "<optional recommended relay URL>"],
["p", "<32-bytes hex of a pubkey>", "<optional recommended relay URL>"],
// Specify the media type for filters to allow clients to filter by supported kinds
["m", "image/jpeg"]
// Hashtags
["t", "<tag>"],
["t", "<tag>"],
// location
["location", "<location>"], // city name, state, country
["g", "<geohash>"],
// When text is written in the image, add the tag to represent the language
["L", "ISO-639-1"],
["l", "en", "ISO-639-1"]
]
}
```
The `imeta` tag `annotate-user` places a user link in the specific position in the image.
Only the following media types are accepted:
- `image/apng`: Animated Portable Network Graphics (APNG)
- `image/avif`: AV1 Image File Format (AVIF)
- `image/gif`: Graphics Interchange Format (GIF)
- `image/jpeg`: Joint Photographic Expert Group image (JPEG)
- `image/png`: Portable Network Graphics (PNG)
- `image/webp`: Web Picture format (WEBP)
Picture events might be used with [NIP-71](71.md)'s kind `34236` to display short vertical videos in the same feed.
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