# NIP-06 Implementation Summary

## ✅ What We've Implemented

### 1. **NIP-06 Key Derivation** (`/src/lib/nip06.ts`)
- Full BIP39 mnemonic generation (12 or 24 words)
- BIP32 key derivation using path `m/44'/1237'/0'/0/0`
- Mnemonic validation and normalization
- Multi-account support (can derive account 0, 1, 2, etc.)
- Complete test coverage in `nip06.test.ts`

### 2. **Mnemonic-Based Signup** (`/src/components/auth/MnemonicSignupDialog.tsx`)
**User Flow:**
1. Click "Sign Up" → Choose "Recovery Phrase" (recommended)
2. Generate 12-word mnemonic automatically
3. Display words in a grid (numbered 1-12)
4. Backup options:
   - 📥 Download as `.txt` file
   - 📋 Copy to clipboard
   - 📱 Generate QR code (opens in new window for printing)
5. Verification quiz: User enters 3 random words to confirm backup
6. Auto-login after verification

**Features:**
- Show/hide mnemonic toggle
- Regenerate option if user isn't happy with words
- Clear security warnings
- QR code backup for easy mobile transfer

### 3. **Mnemonic Recovery in Login** (`/src/components/auth/LoginDialog.tsx`)
**Updated Login Flow:**
- "Key" tab now accepts BOTH nsec AND 12-word recovery phrases
- Auto-detects input type:
  - 12 or 24 words → Validates as mnemonic, derives key
  - Starts with `nsec1` → Validates as nsec
- File upload accepts both mnemonic and nsec `.txt` files
- Helpful hint text: "💡 You can paste either your nsec key or 12-word recovery phrase"

### 4. **Signup Method Selection** (`/src/components/auth/SignupMethodDialog.tsx`)
**Comparison Modal:**
- Side-by-side comparison of mnemonic vs nsec
- **Recovery Phrase** marked as "Recommended"
  - ✓ Easy to write down
  - ✓ Works with other Nostr apps (NIP-06)
  - ✓ Can generate multiple accounts
  - ✓ Familiar to crypto users
- **Secret Key (nsec)** marked as "Advanced"
  - ✓ Direct cryptographic control
  - ✓ Compatible with all apps
  - ✓ Single string to backup
  - ✓ No derivation layer

### 5. **Backup Reminder System** (`/src/components/BackupReminder.tsx`)
**Persistent Warning Banner:**
- Shows at top of app after signup/login
- Displayed until user clicks "I've Backed It Up"
- Stores confirmation in localStorage
- Buttons:
  - "Backup Now" → Links to Settings
  - "I've Backed It Up" → Dismisses and saves confirmation
  - "X" → Temporary dismiss (shows again on next visit)

### 6. **Security Settings Tab** (`/src/components/SecuritySettings.tsx`)
**New Security Tab in Settings:**
- ✅/⚠️ Backup confirmation status
- Key security best practices:
  - ✍️ Write on paper
  - 💾 Multiple backups
  - 🔒 Never share
  - 🚫 Don't store in cloud unencrypted
  - 🔐 Use browser extensions
- Browser extension recommendations:
  - Alby (recommended, includes wallet)
  - Flamingo (simple, clean)
  - nos2x (minimal, advanced)
- Nostr Connect/bunker information:
  - nsec.app (popular)
  - Nostrum (mobile support)

### 7. **Enhanced Bunker Login** (`/src/components/auth/LoginDialog.tsx`)
**Improved Nostr Connect Tab:**
- Better UI with cloud icon and blue theme
- Clear explanation of what bunkers are
- Direct links to nsec.app and Nostrum
- Helpful instructions on how to get connection string

## 🔑 Storage & Security

**Where Keys Are Stored:**
- localStorage via `@nostrify/react/login` with key `'nostr:login'`
- Keys stored as nsec (bech32-encoded)
- No encryption at rest (browser security model)
- Mnemonic phrases are NOT stored - only derived nsec

**Security Model:**
- Mnemonic → Private Key → nsec → localStorage
- User MUST backup mnemonic or nsec externally
- No password protection (relying on device security)
- Browser extensions recommended for better security

## 📝 User Experience Improvements

**Before:**
- Only nsec signup
- Download nsec file
- No verification
- No recovery phrase option

**After:**
- Choose mnemonic (recommended) or nsec (advanced)
- 12-word recovery phrase (easier to backup)
- Verification quiz ensures backup
- QR code option for physical backup
- Login accepts both mnemonic and nsec
- Persistent backup reminders
- Security best practices in settings
- Prominent Nostr Connect option

## 🔄 Backwards Compatibility

✅ **Fully compatible** with existing accounts:
- Old nsec-based accounts still work
- LoginDialog accepts both formats
- No migration needed
- Users can continue using nsec if they prefer

## 📱 Multi-Device Access

**Options Provided:**
1. **Recovery Phrase** - Write down 12 words, restore on any device
2. **Nsec Backup** - Download/copy nsec, paste on new device
3. **Browser Extension** - Sync via extension (Alby, etc.)
4. **Nostr Connect** - Use bunker for cloud-based signing

## 🎯 Next Steps (If Needed)

**Future Enhancements:**
- [ ] Multi-account UI (derive accounts 0, 1, 2 from one mnemonic)
- [ ] Encrypted localStorage with password unlock
- [ ] Social recovery / multi-sig (NIP-26)
- [ ] Passkey / WebAuthn support
- [ ] Weekly backup reminders
- [ ] Mnemonic strength indicator

## 🧪 Testing

Run the test suite to validate NIP-06 implementation:

```bash
npm test
```

The `nip06.test.ts` file includes:
- ✅ Mnemonic generation (12 and 24 words)
- ✅ Validation (correct and incorrect mnemonics)
- ✅ Key derivation (matches NIP-06 test vector)
- ✅ Multi-account derivation
- ✅ Normalization and utility functions
- ✅ Integration with nostr-tools (nsec encoding, public key derivation)

## 📚 Technical References

- **NIP-06**: https://github.com/nostr-protocol/nips/blob/master/06.md
- **BIP39**: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
- **BIP32**: https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
- **SLIP44**: https://github.com/satoshilabs/slips/blob/master/slip-0044.md (Nostr coin type: 1237)

## 🎨 UI/UX Features

- **Visual word grid** for mnemonic display
- **Verification quiz** with 3 random words
- **QR code generation** for physical backup
- **Show/hide toggle** for privacy
- **Regenerate option** if user doesn't like words
- **Backup reminders** until confirmed
- **Security guidance** throughout flow