Nostr MCP Server

import { decode as nip19decode } from "snstr"; /** * Normalize a private key to 64-char lowercase hex. * Accepts: * - 64-char hex * - nsec (NIP-19) */ export function normalizePrivateKey(privateKey: string): string { const pk = privateKey.trim(); if (pk.startsWith("nsec")) { // Validate nsec format before type assertion if (!/^nsec1[0-9a-z]+$/.test(pk)) { throw new Error("Invalid nsec format: must match pattern nsec1[0-9a-z]+"); } const decoded = nip19decode(pk as `${string}1${string}`); if (decoded.type !== "nsec") { throw new Error("Invalid nsec format"); } return String(decoded.data).toLowerCase(); } // Validate hex format for non-nsec keys if (!/^[0-9a-f]{64}$/i.test(pk)) { throw new Error("Invalid private key format: must be 64-character hex string or valid nsec format"); } return pk.toLowerCase(); }