Nostr Protocol

NIP-333

A standard for distributing Bitcoin block headers over Nostr, enabling lightweight clients to verify the blockchain without running a full node.

Each Bitcoin block header is just 80 bytes — the cryptographic proof needed to verify transactions without full blocks.

Parameterized replaceable events ensure relays store only the latest headers. Subscribe once, stay synced.

Build SPV wallets and apps that verify Bitcoin payments using only headers and merkle proofs.

How It Works

Bitcoin Network

→

Publisher

→

Nostr Relays

→

Your App

Archive (completed epochs) + Current (this epoch) + Tip (latest 12 headers)

Full header chain in three pieces, all verifiable

Chain Tip

block height

// Request the latest Bitcoin headers
["REQ", "headers", {
  "kinds": [33333],
  "#d": ["latest"],
  "#n": ["btc"],
  "limit": 1
}]