# NIP-42 Authentication

NDK handles NIP-42 relay authentication automatically. When a relay requires authentication, NDK will sign and send AUTH events, then retry the original request.

# Auth Strategies

NDK supports two authentication strategies:

# Lazy Auth (default)

final ndk = Ndk(NdkConfig(
  eventVerifier: Bip340EventVerifier(),
  cache: MemCacheManager(),
  // eagerAuth: false (default)
));

AUTH is sent only after the relay responds with auth-required
More privacy-respecting: doesn't reveal identity until necessary
Flow: REQ → CLOSED auth-required → AUTH → OK → REQ (retry)

# Eager Auth

final ndk = Ndk(NdkConfig(
  eventVerifier: Bip340EventVerifier(),
  cache: MemCacheManager(),
  eagerAuth: true,
));

AUTH is sent immediately when the relay sends a challenge
Faster for relays that always require auth
Flow: AUTH challenge → AUTH → OK → REQ