Nostr Flash — Custom Event Kinds

Kind 7033 — Flash Post#

Regular (non-replaceable) event representing an ephemeral photography post.

Tags#

Tag	Description
url	Direct URL to the image file (Blossom CDN)
m	MIME type of the image (image/webp, image/jpeg, etc.)
x	SHA-256 hex hash of the image file
dim	Image dimensions in WxH format
lifetime	Survival timer in seconds (e.g. 3600 = 1 hour)
alt	Accessibility caption (≤280 chars)
t	Hashtag for categorisation
imeta	Full Blossom image metadata (NIP-94 compatible)
encrypted	Set to nip44 when content is NIP-44 encrypted
p	Hex pubkey of the encrypted recipient (for private posts)

Content#

• Public posts: Human-readable caption text.
• Private posts: NIP-44 encrypted JSON payload containing { "caption": "...", "imageUrl": "..." }.

Kind 7034 — Flash Boost#

Regular (non-replaceable) reaction event that extends the survival timer of a flash post.

Tags#

Tag	Description
e	Hex event ID of the flash post being boosted
p	Hex pubkey of the flash post author
extension	Number of seconds to add to the post's survival timer
rating	Optional score (1–5) for quality rating

Content#

Optional free-text comment (may be empty).

Expiration Logic#

expiresAt = (event.created_at + parseInt(lifetime_tag) + sum(extension_tags_from_boosts)) * 1000
isExpired = Date.now() > expiresAt

Expired events are hidden from the active feed and shown in the Archive (read-only).