# NIP-13: Proof of Work

Add computational proof-of-work to events for spam prevention.

final minedEvent = Nip01Event(
  pubKey: keyPair.publicKey,
  kind: 1,
  tags: [],
  content: 'message',
).minePoW(12);

if (minedEvent.checkPoWDifficulty(10)) {
  print('Valid PoW, event has difficulty >= 10');
}

Event Methods:

• minePoW(difficulty) - Add PoW
• checkPoWDifficulty(target) - Verify
• powDifficulty - Get difficulty

Nip13 Class:

• Nip13.mineEvent(event, difficulty)
• Nip13.validateEvent(event)