FaceZK v1.1.0 - Privacy-First Human Verification


Zero-Knowledge Proof of Humanity with Advanced Liveness Detection and Expression State Management

FaceZK v1.1.0 is a complete rewrite focusing on privacy-first design, modular architecture, and enterprise-grade security. Built with modern cryptographic standards, comprehensive audit logging, and advanced liveness detection with sequential challenge completion.

🏢 About Us

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FaceZK is the culmination of years of research and development, starting with VerifiedCreators in 2021 during the Web3 creator economy boom. Our journey began with a simple yet powerful vision: to build trust in the digital world through advanced identity verification.

#### VerifiedCreators (2021)
- Mission: Public creator profiles with onchain primitives to instill trust and attract investors
- Innovation: Non-KYC identity verification technology
- Impact: Helped creators build credibility in the emerging Web3 ecosystem
- Foundation: Established the core principles of privacy-first verification

#### VerifiedOnchain Protocol (2024+)
- Vision: The most advanced ONCHAIN and Non-KYC identity verification protocol
- Technology: AI-powered verification with Zero-Knowledge Proofs (ZKP)
- Research: Backed by comprehensive academic research and real-world testing
- Goal: Democratize trust in the decentralized web

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FaceZK is 1/3 of the technical steps toward launching the full VerifiedOnchain protocol. This library represents our commitment to:

- Privacy-First Design: Zero-knowledge verification without compromising security
- Academic Rigor: Research-backed implementation with peer-reviewed methodologies
- Open Source: Transparent, auditable, and community-driven development
- Enterprise Ready: Production-grade security and performance

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We believe that trust should be decentralized, privacy should be guaranteed, and verification should be seamless. In a world where digital identity is increasingly important, we're building the infrastructure that will power the next generation of trusted interactions.

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- Email: support@verifiedcreators.io
- Research: Academic thesis available for deeper technical understanding
- Protocol Documentation: Coming soon (2/3 technical milestone)

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🚀 What's New in v1.1.0

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- True Zero-Knowledge: No raw biometric data storage
- AES-GCM Encryption: Military-grade encryption for all sensitive data
- Secure Key Derivation: PBKDF2 with 100,000+ iterations
- Random Salt Generation: Cryptographically secure random salts
- Audit Trail: Complete audit logging for compliance
- Memory Protection: Automatic cleanup and monitoring

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- Sequential Challenge System: Enforces correct order: Blink → Head Turn → Smile
- Expression State Management: Stable expression persistence across frames
- Debounced Detection: Prevents overwriting of expression data
- Real-time Feedback: Visual indicators for current challenge step
- Confidence Tracking: Per-expression confidence scoring

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- Plugin System: Extensible plugin architecture
- Dependency Management: Automatic plugin dependency resolution
- Hot Reloading: Plugin updates without restart
- Type Safety: Full TypeScript support for all plugins
- Error Recovery: Graceful error handling and recovery

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- Performance Monitoring: Real-time performance metrics
- Memory Management: Automatic TensorFlow.js cleanup
- Audit Logging: Complete audit trail with export
- Configuration Validation: Comprehensive config validation
- Migration Tools: Easy migration from v1.x

🛡️ Security Features

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``typescript
// No raw biometric data storage
const template = await cryptoPlugin.encryptTemplate(biometricData, systemSalt);
const humanityCode = await cryptoPlugin.generateHumanityCode(biometricId, systemSalt);
`

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- AES-GCM: Authenticated encryption for templates
- PBKDF2: Secure key derivation (100,000+ iterations)
- SHA-256: Secure hashing for humanity codes
- Random IVs: Unique initialization vectors for each encryption
- Salt Generation: Cryptographically secure random salts

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- Complete Audit Trail: All operations logged
- GDPR Compliance: Data protection by design
- SOC 2 Ready: Security controls and monitoring
- Export Capabilities: Audit log export for compliance

🎯 Liveness Detection Features

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`typescript
// Enforces correct order of completion
const challenges = ['blink', 'head-turn', 'smile'];
const currentStep = session.expressionState?.currentStep; // 'blink' | 'head-turn' | 'smile' | 'completed'
`

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`typescript
// Stable expression persistence across frames
const expressionState = {
stableExpressions: {
blink: { detected: boolean; confidence: number; timestamp: number },
smile: { detected: boolean; confidence: number; timestamp: number },
headTurn: { detected: boolean; confidence: number; timestamp: number }
},
currentStep: 'blink',
frameCount: 15,
debounceTimer: NodeJS.Timeout
};
`

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- Current Step Highlighting: Blue border with pulsing animation
- Completed Steps: Green checkmark with confidence scores
- Waiting Steps: Grayed out with "⏳ Waiting..." status
- Progress Tracking: Real-time confidence updates

🏗️ Architecture Overview

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`
FaceZK v1.1.0
├── Core (FaceZKCore)
│ ├── Plugin Manager
│ ├── Session Management
│ ├── Expression State Management
│ └── Verification Engine
├── Face Detection (Human.js Integration)
│ ├── Face Mesh Extraction
│ ├── Landmark Detection
│ ├── Emotion Analysis
│ └── Anti-spoofing
├── Liveness Detection
│ ├── Sequential Challenge System
│ ├── Expression State Persistence
│ ├── Frame Analysis
│ └── Confidence Scoring
├── Biometric Processing
│ ├── Template Generation
│ ├── Fuzzy Hashing
│ └── Descriptor Extraction
└── Plugins
├── Crypto Plugin (AES-GCM, PBKDF2)
├── Memory Plugin (TensorFlow.js management)
├── Audit Plugin (Compliance logging)
└── Performance Plugin (Metrics & monitoring)
`

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`typescript
interface IPlugin {
readonly id: string;
readonly name: string;
readonly version: string;
readonly state: PluginState;

initialize(config: any): Promise;
dispose(): Promise;
isReady(): boolean;
}
`

📦 Installation

`bash
npm install facezk-core@^1.1.0
`

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`bash
npm install @tensorflow/tfjs@^4.22.0
npm install @vladmandic/human@^1.3.0
npm install react@^18.0.0 react-dom@^18.0.0 # For React integration
`

🎯 Quick Start

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`typescript
import { FaceZK, generateSecureSalt } from 'facezk-core';

// Create with secure configuration
const facezk = await FaceZK.create({
systemSalt: generateSecureSalt(), // Cryptographically secure
enableAudit: true,
maxMemoryMB: 512,
enableMemoryMonitoring: true,
minConfidence: 0.8,
minLivenessScore: 0.7,
});

// Start verification session
const session = facezk.startSession();

// Process video frame
const video = document.getElementById('video');
const result = await facezk.processFrame(video);

if (result?.verified) {
console.log('Humanity Code:', result.humanityCode);
console.log('Biometric ID:', result.biometricId);
console.log('Liveness Score:', result.livenessScore);
console.log('Completed Challenges:', result.metadata.challengesCompleted);
}

// Cleanup
await facezk.dispose();
`

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`typescript
import { FaceZK, DEFAULT_CONFIG } from 'facezk-core';

const config = {
...DEFAULT_CONFIG,
systemSalt: 'your-secure-system-salt-2024',
enableAudit: true,
auditRetentionDays: 365,
maxMemoryMB: 1024,
enableMemoryMonitoring: true,
cryptoConfig: {
algorithm: 'AES-GCM',
iterations: 200000, // Higher security
keyLength: 256,
},
auditConfig: {
externalEndpoint: 'https://your-audit-service.com/logs',
enableCompression: true,
enableEncryption: true,
},
// Liveness detection configuration
livenessConfig: {
expressionDebounceMs: 500,
minStableFrames: 5,
sequentialChallenges: true,
},
};

const facezk = await FaceZK.create(config);
`

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`typescript
import { FaceZK, createCryptoPlugin, createMemoryPlugin } from 'facezk-core';

// Create custom plugins
const cryptoPlugin = createCryptoPlugin({
algorithm: 'AES-GCM',
iterations: 150000,
});

const memoryPlugin = createMemoryPlugin({
maxMemoryMB: 1024,
enableProfiling: true,
});

// Use with FaceZK
const facezk = await FaceZK.create({
systemSalt: generateSecureSalt(),
cryptoConfig: cryptoPlugin.getConfig(),
memoryConfig: memoryPlugin.getConfig(),
});
`

🔧 API Reference

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#### Factory Method
`typescript
static async create(config?: FaceZKConfig): Promise
`

#### Core Methods
`typescript
// Session management
startSession(): VerificationSession
getSession(): VerificationSession | null
getCurrentSession(): VerificationSession | null
resetSession(): void

// Frame processing
async processFrame(input: Input, options?: VerificationOptions): Promise

// Expression state management
getExpressionState(): ExpressionState | null
getCurrentStep(): 'blink' | 'head-turn' | 'smile' | 'completed'

// System information
isReady(): boolean
getConfig(): FaceZKConfig
getSystemStats(): SystemStats
getPluginInfo(pluginId: string): PluginInfo | null
listPlugins(): PluginInfo[]

// Memory management
getMemoryStats(): MemoryStats
async cleanupMemory(): Promise

// Audit logging
async getAuditTrail(sessionId: string): Promise
async exportAuditLog(startDate: Date, endDate: Date): Promise

// Legacy methods (for v1.x compatibility)
async generateHumanityCode(biometricId: string, additionalData?: string): Promise
async encryptTemplate(templateData: Uint8Array, userSalt?: string): Promise
async decryptTemplate(encryptedData: EncryptedData): Promise

// Cleanup
async dispose(): Promise
`

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`typescript
interface VerificationSession {
id: string;
startTime: Date;
state: 'initializing' | 'detecting' | 'verifying' | 'completed' | 'failed';
progress: number;
result?: VerificationResult;
error?: string;
expressionState?: {
lastStableFrame: number;
stableExpressions: {
blink: { detected: boolean; confidence: number; timestamp: number };
smile: { detected: boolean; confidence: number; timestamp: number };
headTurn: { detected: boolean; confidence: number; timestamp: number };
};
frameCount: number;
debounceTimer?: NodeJS.Timeout;
currentStep: 'blink' | 'head-turn' | 'smile' | 'completed';
stepStartTime: number;
stepCompletionTime?: number;
};
}
`

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`typescript
interface VerificationResult {
verified: boolean;
humanityCode: string;
biometricId: string;
livenessScore: number;
confidence: number;
timestamp: Date;
sessionId: string;
metadata: {
processingTime: number;
frameCount: number;
challengesCompleted: string[];
stableExpressions: {
blink: { detected: boolean; confidence: number };
smile: { detected: boolean; confidence: number };
headTurn: { detected: boolean; confidence: number };
};
boundingBox?: [number, number, number, number];
progress: number;
};
}
`

🎮 Demo & Testing

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`bash
npm run demo
`

The demo includes:
- Real-time Face Detection: Live video processing with Human.js
- Sequential Liveness Challenges: Step-by-step expression detection
- Visual Feedback: Current step highlighting and progress tracking
- Expression State Display: Real-time confidence scores
- Verification Results: Humanity codes and biometric IDs

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- Step-by-step Guidance: Clear instructions for each challenge
- Visual Indicators: Color-coded challenge cards
- Progress Tracking: Real-time confidence updates
- Error Handling: Graceful fallbacks for detection failures
- Performance Monitoring: Memory usage and processing time

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`bash

Unit tests

npm test

Integration tests

npm run test:integration

Security tests

npm run test:security

Demo server

npm run demo
`

🔌 Creating Custom Plugins

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`typescript
interface IPlugin {
readonly id: string;
readonly name: string;
readonly version: string;
readonly state: PluginState;

initialize(config: any): Promise;
dispose(): Promise;
isReady(): boolean;
}
`

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`typescript
import { IPlugin, PluginState } from 'facezk-core';

class CustomFaceDetectionPlugin implements IPlugin {
public readonly id = 'custom-face-detector';
public readonly name = 'Custom Face Detector';
public readonly version = '1.0.0';
public state: PluginState = 'disposed';

async initialize(config: any): Promise {
// Initialize your custom face detection logic
this.state = 'ready';
}

async dispose(): Promise {
// Cleanup resources
this.state = 'disposed';
}

isReady(): boolean {
return this.state === 'ready';
}

async detect(input: Input): Promise {
// Your custom detection logic
return null;
}
}

// Register and use
const plugin = new CustomFaceDetectionPlugin();
pluginManager.registry.register(plugin);
`

📊 Monitoring & Debugging

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`typescript
const stats = facezk.getSystemStats();
console.log('Memory Usage:', stats.memory);
console.log('Plugin Status:', stats.plugins);
console.log('Performance Metrics:', stats.performance);
`

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`typescript
const session = facezk.getCurrentSession();
const expressionState = session?.expressionState;

if (expressionState) {
console.log('Current Step:', expressionState.currentStep);
console.log('Frame Count:', expressionState.frameCount);
console.log('Stable Expressions:', expressionState.stableExpressions);
}
`

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`typescript
const auditTrail = await facezk.getAuditTrail(sessionId);
console.log('Session Events:', auditTrail);

const auditExport = await facezk.exportAuditLog(
new Date('2024-01-01'),
new Date('2024-12-31')
);
console.log('Audit Export:', auditExport);
`

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`typescript
const plugins = facezk.listPlugins();
plugins.forEach(plugin => {
console.log(${plugin.name}: ${plugin.state});
});

const cryptoInfo = facezk.getPluginInfo('crypto-plugin');
console.log('Crypto Plugin:', cryptoInfo);
`

🔒 Security Best Practices

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`typescript
// ✅ Good: Use secure random salt
const config = {
systemSalt: generateSecureSalt(),
enableAudit: true,
auditRetentionDays: 90,
};

// ❌ Bad: Hardcoded salt
const config = {
systemSalt: 'my-secret-salt',
enableAudit: false,
};
`

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`typescript
// ✅ Good: Enable memory monitoring
const config = {
maxMemoryMB: 512,
enableMemoryMonitoring: true,
};

// ✅ Good: Regular cleanup
await facezk.cleanupMemory();
`

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`typescript
// ✅ Good: Enable comprehensive audit logging
const config = {
enableAudit: true,
auditRetentionDays: 365,
auditConfig: {
logLevel: 'security',
enableEncryption: true,
},
};
`

🚀 Performance Optimization

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`typescript
const config = {
maxMemoryMB: 1024,
enableMemoryMonitoring: true,
memoryConfig: {
cleanupInterval: 30000, // 30 seconds
enableProfiling: true,
},
};
`

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`typescript
const config = {
backend: 'webgl', // Best performance for most cases
// backend: 'wasm', // Good for CPU-only environments
// backend: 'cpu', // Fallback option
};
`

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`typescript
const config = {
livenessConfig: {
expressionDebounceMs: 300, // Faster response
minStableFrames: 3, // Lower threshold for faster completion
sequentialChallenges: true,
},
};
`

🔄 Migration from v1.x

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`typescript
import { migrateFromV1 } from 'facezk-core';

const v1Config = {
backend: 'webgl',
minConfidence: 0.8,
challenges: ['blink', 'head-turn'],
};

const v2Config = migrateFromV1(v1Config);
const facezk = await FaceZK.create(v2Config);
`

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`typescript
// v1.x initialization
const facezk = new FaceZK(config);
await facezk.initialize();

// v2.0 initialization
const facezk = await FaceZK.create(config);
`

📚 Examples

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`typescript
import { useFaceZK } from 'facezk-core/react';

function FaceVerification() {
const { facezk, isReady, processFrame } = useFaceZK({
systemSalt: generateSecureSalt(),
enableAudit: true,
});

const handleVideoFrame = async (video: HTMLVideoElement) => {
const result = await processFrame(video);
if (result?.verified) {
console.log('Verification successful!');
console.log('Completed challenges:', result.metadata.challengesCompleted);
}
};

return (

{isReady ? 'Ready for verification' : 'Initializing...'}

);
}
`

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`typescript
import { FaceZK, generateSecureSalt } from 'facezk-core';

class VerificationService {
private facezk: FaceZK;

async initialize() {
this.facezk = await FaceZK.create({
systemSalt: generateSecureSalt(),
enableAudit: true,
auditRetentionDays: 365,
});
}

async verifyUser(imageBuffer: Buffer) {
const session = this.facezk.startSession();
const result = await this.facezk.processFrame(imageBuffer);

if (result?.verified) {
return {
success: true,
humanityCode: result.humanityCode,
biometricId: result.biometricId,
livenessScore: result.livenessScore,
challengesCompleted: result.metadata.challengesCompleted,
};
}

return { success: false };
}
}
`

🐛 Troubleshooting

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If you encounter 404 errors for model files:
1. Ensure the models directory exists in your project root
2. Verify the demo server is configured to serve /models directory
3. Check that all required .json and .bin files are present

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If expressions are not being detected:
1. Ensure good lighting conditions
2. Position face clearly in camera view
3. Complete challenges in the correct order: Blink → Head Turn → Smile
4. Check browser console for detailed error messages

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If experiencing slow performance:
1. Reduce maxMemoryMB in configuration
2. Enable memory monitoring and cleanup
3. Use WebGL backend for better GPU acceleration
4. Adjust expressionDebounceMs for faster response

🤝 Contributing

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

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`bash
git clone https://github.com/facezk/facezk-lib.git
cd facezk-lib
npm install
npm run dev
`

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`bash
npm run lint
npm run type-check
npm run test:coverage
``

📄 License

MIT License - see LICENSE for details.

🔗 Links

- Documentation: https://facezk.com/docs
- API Reference: https://facezk.com/api
- Security: https://facezk.com/security
- Migration Guide: MIGRATION_GUIDE.md

🆘 Support

- Issues: GitHub Issues
- Discussions: GitHub Discussions
- Email: support@verifiedcreators.io

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FaceZK v1.1.0 - Privacy-First Human Verification with Advanced Liveness Detection

Built by the team behind VerifiedCreators and VerifiedOnchain Protocol