nostr-nsec-seedphrase

A focused TypeScript library for Nostr key management and seedphrase functionality, with seamless integration with nostr-crypto-utils. This package specializes in converting between nsec keys and seed phrases, managing delegations, and handling various key formats.

Core Features

• 🌱 Seedphrase Management

  • Generate and validate BIP39 seed phrases
  • Convert between seed phrases and Nostr keys
  • Secure entropy generation
  • Multiple language support

• 🔑 Key Operations

  • Convert between formats (hex, nsec, npub)
  • Validate key pairs
  • Generate new key pairs
  • Public key derivation

• 📝 Delegation Support (NIP-26)

  • Create delegation tokens
  • Time-based conditions
  • Event kind filtering
  • Token validation and verification
  • Expiry management

• 🔄 Format Conversions

  • Hex ↔ nsec
  • Hex ↔ npub
  • Seed phrase ↔ key pair
  • Comprehensive validation

NIPs Support Status

🟢 Fully implemented 🟡 Partially implemented 🔴 Not implemented

NIP	Status	Description
01	🟢	Basic protocol flow & event signing
06	🟢	Basic key derivation from seed phrase
19	🟢	bech32-encoded entities
26	🟢	Delegated event signing

Installation

npm install nostr-nsec-seedphrase

Quick Start

Generate a New Key Pair with Seed Phrase

import { generateKeyPairWithSeed } from 'nostr-nsec-seedphrase';

const keyPair = generateKeyPairWithSeed();
console.log({
  seedPhrase: keyPair.seedPhrase,
  nsec: keyPair.nsec,
  npub: keyPair.npub
});

Convert Seed Phrase to Key Pair

import { seedPhraseToKeyPair } from 'nostr-nsec-seedphrase';

const keyPair = await seedPhraseToKeyPair('your twelve word seed phrase here');
console.log({
  privateKey: keyPair.privateKey, // hex format
  publicKey: keyPair.publicKey,   // hex format
  nsec: keyPair.nsec,            // bech32 format
  npub: keyPair.npub             // bech32 format
});

Create and Verify Delegations

import { createDelegation, verifyDelegation } from 'nostr-nsec-seedphrase';

// Create a delegation token
const delegation = await createDelegation(
  delegateePublicKey,
  {
    kinds: [1, 2], // allowed event kinds
    since: Math.floor(Date.now() / 1000),
    until: Math.floor(Date.now() / 1000) + 86400 // 24 hours
  },
  delegatorPrivateKey
);

// Verify a delegation
const isValid = await verifyDelegation(
  delegation,
  Math.floor(Date.now() / 1000), // current timestamp
  1 // event kind to verify
);

Key Features in Detail

1. Seedphrase Management

The library provides comprehensive seedphrase functionality:

import { 
  generateSeedPhrase,
  validateSeedPhrase,
  seedPhraseToKeyPair
} from 'nostr-nsec-seedphrase';

// Generate a new seed phrase
const seedPhrase = generateSeedPhrase();

// Validate an existing seed phrase
const isValid = validateSeedPhrase(seedPhrase);

// Convert seed phrase to key pair
const keyPair = await seedPhraseToKeyPair(seedPhrase);

2. Key Format Conversions

Easy conversion between different key formats:

import {
  hexToNsec,
  hexToNpub,
  nsecToHex,
  npubToHex
} from 'nostr-nsec-seedphrase';

// Convert hex to bech32 formats
const nsec = hexToNsec(privateKeyHex);
const npub = hexToNpub(publicKeyHex);

// Convert bech32 to hex formats
const privateKeyHex = nsecToHex(nsec);
const publicKeyHex = npubToHex(npub);

3. Delegation Management

Comprehensive NIP-26 delegation support:

import {
  createDelegation,
  verifyDelegation,
  isDelegationValid,
  getDelegationExpiry
} from 'nostr-nsec-seedphrase';

// Create a delegation with conditions
const delegation = await createDelegation(delegatee, {
  kinds: [1], // only text notes
  since: Math.floor(Date.now() / 1000),
  until: Math.floor(Date.now() / 1000) + 86400
}, delegatorPrivateKey);

// Check delegation validity
const isValid = await isDelegationValid(delegation);

// Get delegation expiry
const expiry = getDelegationExpiry(delegation);

Documentation

The library includes comprehensive TypeScript types and JSDoc documentation. You can:

1. View the documentation in your IDE through TypeScript and JSDoc annotations
2. Generate HTML documentation using:

   npm run docs

3. Access the generated documentation in the docs directory

Key Format Utilities

import { nip19 } from 'nostr-nsec-seedphrase';

// Encode/decode public keys
const npub = nip19.npubEncode(hexPublicKey);
const hexPubkey = nip19.npubDecode(npub);

// Encode/decode private keys
const nsec = nip19.nsecEncode(hexPrivateKey);
const hexPrivkey = nip19.nsecDecode(nsec);

// Encode/decode event IDs
const note = nip19.noteEncode(eventId);
const hexEventId = nip19.noteDecode(note);

Integration with nostr-crypto-utils

This package is designed to work seamlessly with nostr-crypto-utils:

• Uses compatible key formats and types
• Leverages nostr-crypto-utils for cryptographic operations
• Maintains consistent error handling and validation

Security Considerations

• Never share or expose private keys or seed phrases
• Always validate input seed phrases and keys
• Use secure entropy sources for key generation
• Implement proper key storage practices
• Regularly rotate delegation tokens
• Set appropriate expiry times for delegations

Contributing

We welcome contributions! Please see our Contributing Guide for details.

License

MIT License - see the LICENSE file for details.