Nostr Relay Builder

Build a Nostr relay from scratch: WebSocket server, NIP-01 message protocol, event validation (id + signature), filter matching, subscription management, and progressive NIP support.

Overview

A Nostr relay is a WebSocket server that receives, validates, stores, and distributes events. This skill walks through building one step by step, starting with the mandatory NIP-01 protocol and progressively adding optional NIPs.

When to use

• The task is implementing or extending a Nostr relay server.
• The user needs relay-side handling for WebSocket messages, event validation, storage rules, subscriptions, or relay-supported NIPs.
• The problem lives on the server side of the protocol, not in a client app.
• The output should shape relay behavior, persistence, or message handling.