Sphyre ALV

Sphyre ALV is a Progressive Web App (PWA) that serves as the user’s digital wallet for managing their self-sovereign identity, credentials, and connections. Built with Next.js, it provides an intuitive interface for all SSI operations.

Overview

Sphyre ALV (Autonomous Ledger Vault) is where users store and manage their digital identity, credentials, and consent preferences.

Technology

Framework: Next.js 14
Language: TypeScript
URL: https://app.sphyre.tech

Key Features

Seed phrase wallet
Credential management
QR code scanning
Zero-knowledge proofs

Key Features

Digital Wallet

12-word BIP39 seed phrase generation
DID creation and management (did:alyra format)
Encrypted backup with password protection
Biometric authentication support (WebAuthn)
Multi-device sync capability

Credential Management

Store unlimited verifiable credentials
Credential slider for quick access
Detailed credential viewer
Selective disclosure controls
Credential expiration tracking
QR code generation for sharing

QR Code Scanning

Scan credential offers from issuers
Scan presentation requests from verifiers
Generate QR codes for credential sharing
Type detection and routing

Privacy Controls

Zero-knowledge proof generation
Selective disclosure settings
Consent management dashboard
Connection tracking
Data sharing preferences

Connections

Track issuers and verifiers
Manage trusted organizations
View interaction history
Revoke access anytime

Application Structure

sphyre-alv/
├── src/
│   ├── app/
│   │   ├── onboarding/          # Wallet creation
│   │   ├── recovery/            # Seed phrase recovery
│   │   ├── SSIWalletIdentity/   # Main dashboard
│   │   ├── RequestCredential/   # Request flow
│   │   ├── CollectCredentials/  # Receive credentials
│   │   ├── CredentialRequest/   # Present credentials
│   │   ├── Settings/            # User preferences
│   │   └── Connections/         # Manage connections
│   ├── components/
│   │   ├── ui/                  # Reusable UI components
│   │   ├── ProfileBar.tsx       # DID display
│   │   ├── CredentialCard.tsx   # Credential display
│   │   └── LoadingScreen.tsx    # Loading states
│   ├── lib/
│   │   ├── crypto/              # Cryptographic utilities
│   │   └── utils.ts             # Helper functions
│   ├── services/
│   │   ├── apiService.ts        # API client
│   │   ├── walletService.ts     # Wallet operations
│   │   └── zkpService.ts        # ZKP generation
│   └── types/
│       └── credentials.ts       # TypeScript definitions
├── public/
│   ├── manifest.json            # PWA manifest
│   └── sw.js                    # Service worker
└── package.json

Core Pages

1. Onboarding Page

First-time wallet setup with seed phrase generation. Features:

Create new wallet or recover existing
12-word seed phrase generation (BIP39)
DID generation from public key
Seed phrase verification (3 random words)
Optional encrypted backup
Biometric setup

Flow:

// Wallet creation
const createWallet = async () => {
  // Generate seed phrase
  const mnemonic = generateMnemonic(128); // 12 words
  
  // Derive key pair
  const seed = mnemonicToSeedSync(mnemonic);
  const keyPair = nacl.sign.keyPair.fromSeed(seed.slice(0, 32));
  
  // Create DID
  const did = `did:alyra:${base64Encode(keyPair.publicKey)}`;
  
  // Store in localStorage (encrypted)
  await storeWallet({ did, keyPair, mnemonic });
  
  return { did, mnemonic };
};

2. SSI Wallet Identity (Dashboard)

Main dashboard showing credentials and identity information. Components:

Profile Bar: Shows user’s DID with copy functionality
Credential Slider: Top 3 credentials for quick access
Credential List: All credentials with search/filter
Quick Actions: Request, scan QR, settings

Real-time Data:

const SSIWalletIdentity = () => {
  const [credentials, setCredentials] = useState([]);
  const [loading, setLoading] = useState(true);
  const userDID = getUserDID();
  
  useEffect(() => {
    const fetchCredentials = async () => {
      try {
        const response = await apiService.getCredentials(userDID);
        setCredentials(response.data);
      } catch (error) {
        // Fallback to sample data if offline
        setCredentials(sampleCredentials);
      } finally {
        setLoading(false);
      }
    };
    
    fetchCredentials();
  }, [userDID]);
  
  return (
    <div>
      <ProfileBar did={userDID} />
      <CredentialSlider credentials={credentials.slice(0, 3)} />
      <CredentialList credentials={credentials} />
    </div>
  );
};

3. Request Credential Page

Multi-step flow for requesting credentials from issuers. Steps:

Select Schema: Choose credential type
Select Template: Pick issuer’s template
Fill Form: Enter credential data
Review: Confirm before submission

Available Schemas:

National ID
Driver’s License
Student ID
Employee Badge
Professional License
Health Insurance Card

Implementation:

const RequestCredential = () => {
  const [step, setStep] = useState(1);
  const [schema, setSchema] = useState(null);
  const [template, setTemplate] = useState(null);
  const [formData, setFormData] = useState({});
  
  const submitRequest = async () => {
    const request = {
      schemaId: schema.id,
      templateId: template.id,
      holderDid: getUserDID(),
      claims: formData
    };
    
    await apiService.submitCredentialRequest(request);
    router.push('/SSIWalletIdentity');
  };
  
  return (
    <MultiStepForm
      steps={[
        <SchemaSelection onSelect={setSchema} />,
        <TemplateSelection schema={schema} onSelect={setTemplate} />,
        <CredentialForm schema={schema} onChange={setFormData} />,
        <ReviewStep data={formData} onSubmit={submitRequest} />
      ]}
      currentStep={step}
    />
  );
};

4. Collect Credentials Page

Receive credentials from QR code scans or offers. Process:

Scan QR code from issuer
Review credential offer
Accept or decline
Credential stored in wallet

const CollectCredentials = () => {
  const [offer, setOffer] = useState(null);
  
  const handleQRScan = async (qrData) => {
    const parsed = JSON.parse(qrData);
    
    if (parsed.type === 'CredentialOffer') {
      setOffer(parsed);
    }
  };
  
  const acceptOffer = async () => {
    const credential = await apiService.acceptCredentialOffer(
      offer.offerId,
      getUserDID()
    );
    
    // Store credential
    await storeCredential(credential);
    toast.success('Credential received!');
  };
  
  return (
    <div>
      <QRScanner onScan={handleQRScan} />
      {offer && (
        <CredentialOfferModal
          offer={offer}
          onAccept={acceptOffer}
          onDecline={()=> setOffer(null)}
        />
      )}
    </div>
  );
};

5. Credential Request (Present)

Present credentials to verifiers with selective disclosure. Features:

View presentation request details
Select which claims to share
Generate zero-knowledge proofs
Approve or deny request

Selective Disclosure:

const CredentialRequest = () => {
  const [request, setRequest] = useState(null);
  const [selectedClaims, setSelectedClaims] = useState([]);
  const [useZKP, setUseZKP] = useState(false);
  
  const submitPresentation = async () => {
    let presentation;
    
    if (useZKP) {
      // Generate zero-knowledge proof
      presentation = await zkpService.generateProof({
        credential: selectedCredential,
        predicates: request.predicates
      });
    } else {
      // Selective disclosure
      presentation = {
        credential: filterClaims(selectedCredential, selectedClaims),
        holder: getUserDID()
      };
    }
    
    // Sign presentation
    const signature = await signPresentation(presentation);
    presentation.proof = signature;
    
    // Submit to verifier
    await apiService.submitPresentation(request.id, presentation);
    toast.success('Credential presented!');
  };
  
  return (
    <div>
      <RequestDetails request={request} />
      <ClaimSelector
        credential={selectedCredential}
        onSelect={setSelectedClaims}
      />
      <ZKPToggle checked={useZKP} onChange={setUseZKP} />
      <Button onClick={submitPresentation}>Submit</Button>
    </div>
  );
};

6. Settings Page

User preferences and wallet management. Sections:

Profile: DID display and copy
Security: Seed phrase backup, biometrics
Consent: Manage data sharing preferences
Connections: View and manage trusted parties
Appearance: Theme, language settings
About: App version, terms, privacy

Cryptographic Operations

Seed Phrase & Key Derivation

import { generateMnemonic, mnemonicToSeedSync } from 'bip39';
import * as nacl from 'tweetnacl';

export const generateWallet = () => {
  // Generate 12-word seed phrase
  const mnemonic = generateMnemonic(128);
  
  // Convert to seed
  const seed = mnemonicToSeedSync(mnemonic);
  
  // Derive Ed25519 key pair
  const keyPair = nacl.sign.keyPair.fromSeed(seed.slice(0, 32));
  
  // Create DID
  const publicKeyBase64 = Buffer.from(keyPair.publicKey).toString('base64');
  const did = `did:alyra:${publicKeyBase64}`;
  
  return {
    mnemonic,
    did,
    publicKey: keyPair.publicKey,
    secretKey: keyPair.secretKey
  };
};

Message Signing

export const signMessage = (
  message: string,
  secretKey: Uint8Array
): string => {
  const messageBytes = new TextEncoder().encode(message);
  const signature = nacl.sign.detached(messageBytes, secretKey);
  return Buffer.from(signature).toString('base64');
};

export const verifySignature = (
  message: string,
  signature: string,
  publicKey: Uint8Array
): boolean => {
  const messageBytes = new TextEncoder().encode(message);
  const signatureBytes = Buffer.from(signature, 'base64');
  
  return nacl.sign.detached.verify(
    messageBytes,
    signatureBytes,
    publicKey
  );
};

Encrypted Backup

export const createEncryptedBackup = async (
  mnemonic: string,
  password: string
): Promise<string> => {
  const encoder = new TextEncoder();
  const data = encoder.encode(mnemonic);
  
  // Derive key from password
  const keyMaterial = await crypto.subtle.importKey(
    'raw',
    encoder.encode(password),
    'PBKDF2',
    false,
    ['deriveBits', 'deriveKey']
  );
  
  const key = await crypto.subtle.deriveKey(
    {
      name: 'PBKDF2',
      salt: encoder.encode('sphyre-salt'),
      iterations: 100000,
      hash: 'SHA-256'
    },
    keyMaterial,
    { name: 'AES-GCM', length: 256 },
    true,
    ['encrypt', 'decrypt']
  );
  
  // Encrypt
  const iv = crypto.getRandomValues(new Uint8Array(12));
  const encrypted = await crypto.subtle.encrypt(
    { name: 'AES-GCM', iv },
    key,
    data
  );
  
  // Combine IV and encrypted data
  const combined = new Uint8Array(iv.length + encrypted.byteLength);
  combined.set(iv);
  combined.set(new Uint8Array(encrypted), iv.length);
  
  return Buffer.from(combined).toString('base64');
};

API Integration

API Service

class ApiService {
  private baseURL = 'https://api.sphyre.tech';
  
  async getCredentials(did: string) {
    const response = await fetch(`${this.baseURL}/api/wallet/${did}/credentials`, {
      headers: {
        'Authorization': `Bearer ${getToken()}`,
        'X-User-DID': did
      }
    });
    
    return response.json();
  }
  
  async submitCredentialRequest(request: CredentialRequest) {
    const response = await fetch(`${this.baseURL}/api/issuer/request`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${getToken()}`
      },
      body: JSON.stringify(request)
    });
    
    return response.json();
  }
  
  async submitPresentation(requestId: string, presentation: Presentation) {
    const response = await fetch(
      `${this.baseURL}/api/verifier/submit/${requestId}`,
      {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${getToken()}`
        },
        body: JSON.stringify(presentation)
      }
    );
    
    return response.json();
  }
}

export const apiService = new ApiService();

PWA Features

Service Worker

Enables offline functionality and credential caching.

// sw.js
self.addEventListener('install', (event) => {
  event.waitUntil(
    caches.open('sphyre-v1').then((cache) => {
      return cache.addAll([
        '/',
        '/onboarding',
        '/SSIWalletIdentity',
        '/offline.html'
      ]);
    })
  );
});

self.addEventListener('fetch', (event) => {
  event.respondWith(
    caches.match(event.request).then((response) => {
      return response || fetch(event.request);
    })
  );
});

Manifest

{
  "name": "Sphyre ALV",
  "short_name": "Sphyre",
  "description": "Your Self-Sovereign Identity Wallet",
  "start_url": "/",
  "display": "standalone",
  "background_color": "#ffffff",
  "theme_color": "#6366F1",
  "icons": [
    {
      "src": "/icon-192x192.png",
      "sizes": "192x192",
      "type": "image/png"
    },
    {
      "src": "/icon-512x512.png",
      "sizes": "512x512",
      "type": "image/png"
    }
  ]
}

UI Components

Credential Card

const CredentialCard = ({ credential }: { credential: Credential }) => {
  return (
    <div className="credential-card bg-gradient-to-br from-indigo-500 to-purple-600 rounded-xl p-6 text-white">
      <div className="flex justify-between items-start mb-4">
        <div>
          <h3 className="text-xl font-bold">{credential.type}</h3>
          <p className="text-sm opacity-80">{credential.issuerName}</p>
        </div>
        <Badge status={credential.status} />
      </div>
      
      <div className="space-y-2">
        {Object.entries(credential.claims).map(([key, value]) => (
          <div key={key} className="flex justify-between">
            <span className="opacity-80">{formatLabel(key)}:</span>
            <span className="font-medium">{value}</span>
          </div>
        ))}
      </div>
      
      <div className="mt-4 flex gap-2">
        <Button onClick={() => showQR(credential)}>Show QR</Button>
        <Button variant="outline" onClick={() => viewDetails(credential)}>
          Details
        </Button>
      </div>
    </div>
  );
};

QR Scanner

import { QrReader } from 'react-qr-reader';

const QRScanner = ({ onScan }: { onScan: (data: string) => void }) => {
  const [error, setError] = useState(null);
  
  return (
    <div className="qr-scanner">
      <QrReader
        onResult={(result, error) => {
          if (result) {
            onScan(result.text);
          }
          if (error) {
            setError(error);
          }
        }}
        constraints={{ facingMode: 'environment' }}
        className="w-full"
      />
      {error && <p className="text-red-500 mt-2">{error.message}</p>}
    </div>
  );
};

Security Best Practices

Seed Phrase Storage

Never send seed phrase over network
Store encrypted in localStorage
Prompt for biometric verification before display
Clear from memory after use

Private Key Protection

Keep private keys in memory only when needed
Use Web Crypto API for operations
Never log or expose private keys
Implement auto-lock after inactivity

Network Security

HTTPS only connections
Certificate pinning
Request/response validation
Timeout handling

UI Security

Screen capture prevention for seed phrase
Blur sensitive data when app backgrounded
Session timeout
Clipboard clearing after copy

User Experience

Loading States

const LoadingScreen = ({ status }: { status: string }) => {
  return (
    <div className="loading-screen">
      <div className="spinner" />
      <p className="text-gray-600 mt-4">{status}</p>
      <p className="text-sm text-gray-400 mt-2">
        This won't take long...
      </p>
    </div>
  );
};

Error Handling

const ErrorBoundary = ({ children }: { children: ReactNode }) => {
  const [hasError, setHasError] = useState(false);
  
  useEffect(() => {
    const handler = (error: Error) => {
      console.error('App error:', error);
      setHasError(true);
      
      // Show user-friendly message
      toast.error('Something went wrong. Please try again.');
    };
    
    window.addEventListener('error', handler);
    return () => window.removeEventListener('error', handler);
  }, []);
  
  if (hasError) {
    return <ErrorFallback onReset={() => setHasError(false)} />;
  }
  
  return <>{children}</>;
};

Offline Support

Sphyre ALV works offline with cached credentials:

const useOfflineMode = () => {
  const [isOnline, setIsOnline] = useState(navigator.onLine);
  
  useEffect(() => {
    const handleOnline = () => setIsOnline(true);
    const handleOffline = () => setIsOnline(false);
    
    window.addEventListener('online', handleOnline);
    window.addEventListener('offline', handleOffline);
    
    return () => {
      window.removeEventListener('online', handleOnline);
      window.removeEventListener('offline', handleOffline);
    };
  }, []);
  
  return isOnline;
};

Resources

User Guide

Complete wallet setup guide

API Reference

Wallet API documentation

Live Demo

Try Sphyre ALV

GitHub

Source code

Getting Started

Core Concepts

Components

User Guides

Developer Guides

​Sphyre ALV

​Overview

Technology

Key Features

​Key Features

​Application Structure

​Core Pages

​1. Onboarding Page

​2. SSI Wallet Identity (Dashboard)

​3. Request Credential Page

​4. Collect Credentials Page

​5. Credential Request (Present)

​6. Settings Page

​Cryptographic Operations

​Seed Phrase & Key Derivation

​Message Signing

​Encrypted Backup

​API Integration

​API Service

​PWA Features

​Service Worker

​Manifest

​UI Components

​Credential Card

​QR Scanner

​Security Best Practices

​User Experience

​Loading States

​Error Handling

​Offline Support

​Resources

User Guide

API Reference

Live Demo

GitHub

Sphyre ALV

Overview

Key Features

Application Structure

Core Pages

1. Onboarding Page

2. SSI Wallet Identity (Dashboard)

3. Request Credential Page

4. Collect Credentials Page

5. Credential Request (Present)

6. Settings Page

Cryptographic Operations

Seed Phrase & Key Derivation

Message Signing

Encrypted Backup

API Integration

API Service

PWA Features

Service Worker

Manifest

UI Components

Credential Card

QR Scanner

Security Best Practices

User Experience

Loading States

Error Handling

Offline Support

Resources