NIP-68 defines addressable picture events. It gives clients a portable way to publish image metadata, captions, labels, and references to image files while keeping the event itself separate from blob storage.

How It Works

A picture uses kind 20 and carries a title tag with a description in content. The imeta tag describes each image with fields such as url, m for MIME type, dim for dimensions, alt text, and an optional SHA-256 hash. Multiple imeta tags let one event represent an image set.

The event can include p tags for people depicted or credited, t tags for topics, and ordinary Nostr references. It can also include media-type, hash, location, and content-warning tags so clients can filter and render image posts consistently.

NIP-68 does not prescribe a storage backend. Clients can reference ordinary HTTPS URLs or a content-addressed system such as Blossom, as long as they publish enough imeta metadata for another client to display and verify the image.

Implementations

NoorNote 1.3.0 added NIP-68 image tagging alongside its image-oriented client features.

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