Definition
The Outbox Model, historically called the "gossip" model, is a relay-routing strategy defined by NIP-65 that keeps Nostr decentralized as it scales. Rather than everyone piling onto a handful of large relays, each user advertises which relays they write to and which they read from, and clients use that information to route traffic intelligently.
How NIP-65 expresses it
A user publishes a replaceable kind 10002 event containing r tags, each holding a relay URL with an optional read or write marker. Clients then follow a simple rule: to publish your notes, send them to your own write relays; to find someone else's notes, read from their write relays; and to reach a specific person (for mentions), write to their read relays. Because the relay list is itself a Nostr event, it propagates across the network, so no central directory of relays is required.
Why it matters for sovereignty
The Outbox Model means a user's content lives wherever that user chooses, not on a relay a platform controls. If a popular relay goes down or de-platforms someone, followers can still find that person's notes on their other write relays. The specification recommends keeping each list small, around two to four relays per category, to balance reach against efficiency.
This routing logic is also what makes metadata-private messaging deliverable in practice. See how relay lists drive delivery in NIP-17 (Private Direct Messages) and how individual events are typed in Nostr Event Kind.
In Simple Terms
The Outbox Model, historically called the “gossip” model, is a relay-routing strategy defined by NIP-65 that keeps Nostr decentralized as it scales. Rather than everyone…