All specifications

Negentropy over Nostr: range-based set reconciliation, so two sides transfer only the events one of them lacks.

Kind 9041, a fundraising goal that zaps are tallied against.

The i tags for identifiers that exist outside Nostr: URLs, ISBNs, podcast GUIDs, DOIs, hashtags and blockchain transactions.

Kind 34550, Reddit-style communities where moderators approve the posts addressed to them.

Video events, long and short, carrying the metadata a video client needs around media hosted elsewhere.

The dash tag, marking an event that only its author may publish, which relays enforce through NIP-42.

Kind 20, picture-first posts where the images carry the event rather than illustrate it.

Kind 10002, the list saying where a key writes and where it reads mentions, which is what the outbox model is built on.

Kind 64, a chess game written in PGN.

Kind 62, a request that a relay delete everything a key ever published there.

Nutzaps, where the payment is a Cashu token locked to the recipient's key and published to their relays, so the token itself is the receipt.

Badges: the definition an issuer publishes, the award it grants to a key, and the list a user chooses to show on their profile.

Zaps: the kind 9734 request a payer signs, and the kind 9735 receipt the recipient's wallet publishes once the invoice is paid.

Kind 1984, a report naming content or a key as objectionable, with a type such as nudity, malware or impersonation.

Kind 30311, a live stream or audio space, rewritten as participants join and leave it.

The search field on a filter, and what a relay is expected to make of it.

The AUTH flow, where a relay challenges a client to sign an ephemeral event before granting it access.

The i tags that claim an identity on another platform, each pointing at a proof anyone can check.

Kind 1985 and the L and l tags, which attach a namespaced label to an event, a key, or an external identifier.

Kinds 40 to 44, public chat channels with moderation left to the client.