# 🪪 WIA Digital Identity Standard (WIA-FIN-010)

> **Self-Sovereign Identity for the Decentralized Future**

![Version](https://img.shields.io/badge/version-1.0.0-green)
![License](https://img.shields.io/badge/license-MIT-blue)
![W3C](https://img.shields.io/badge/W3C-DID%20%26%20VC%20Compatible-purple)
![Standard](https://img.shields.io/badge/WIA-FIN--010-22C55E)

---

## 📖 Overview

The **WIA Digital Identity Standard (WIA-FIN-010)** provides a comprehensive framework for implementing self-sovereign digital identity systems using Decentralized Identifiers (DIDs), Verifiable Credentials (VCs), zero-knowledge proofs, biometric authentication, and electronic Know Your Customer (eKYC) processes.

This standard enables:
- ✅ **User-Controlled Identity:** You own and control your digital identity
- ✅ **Privacy by Design:** Share only what's necessary, nothing more
- ✅ **Interoperability:** Works across platforms, services, and borders
- ✅ **Security:** Cryptographically secure and tamper-proof
- ✅ **Compliance:** eKYC/AML ready, GDPR/CCPA compliant
- ✅ **Universal Access:** Financial inclusion for the unbanked

### Philosophy

**홍익인간 (弘益人間) (홍익인간)** - *Benefit All Humanity*

We believe digital identity should empower everyone with:
- **Control:** Own your identity data without central authorities
- **Privacy:** Share selectively with cryptographic proofs
- **Inclusion:** Universal access regardless of location or status
- **Security:** Protection against identity theft and fraud
- **Portability:** Use your identity anywhere, anytime

---

## 🚀 Quick Start

### Installation

```bash
npm install @wia/digital-identity
```

### Basic Usage

```typescript
import { WIAIdentity } from '@wia/digital-identity';

// Initialize SDK
const identity = new WIAIdentity({
  apiKey: 'your_api_key',
  baseUrl: 'https://api.identity.wia.live'
});

// Create a Decentralized Identifier
const did = await identity.createDID({
  method: 'ethr',
  network: 'mainnet',
  keyType: 'Ed25519'
});

console.log('Your DID:', did.id);
// Output: did:ethr:0x3b0BC51Ab9De1e5B7B6E34E5b960285805C41736

// Issue a Verifiable Credential
const credential = await identity.issueCredential({
  issuer: 'did:example:university',
  credentialSubject: {
    id: 'did:example:student',
    degree: {
      type: 'BachelorDegree',
      name: 'Bachelor of Science in Computer Science'
    }
  },
  type: ['VerifiableCredential', 'UniversityDegreeCredential']
});

// Verify a Credential
const verification = await identity.verifyCredential(credential);
console.log('Verified:', verification.verified);
```

---

## 📁 Directory Structure

```
digital-identity-fin/
├── README.md                          # This file
├── index.html                         # Landing page
├── spec/                              # Technical specifications
│   ├── PHASE-1-DATA-FORMAT.md        # Data schemas and formats
│   ├── PHASE-2-API.md                # API specifications
│   ├── PHASE-3-PROTOCOL.md           # Protocol definitions
│   └── PHASE-4-INTEGRATION.md        # WIA ecosystem integration
├── ebook/                             # Educational ebook
│   ├── en/                           # English version
│   │   ├── index.html                # Table of contents
│   │   └── chapter-*.html            # 8 chapters
│   └── ko/                           # Korean version (한국어)
│       ├── index.html                # 목차
│       └── chapter-*.html            # 8개 챕터
├── api/                               # SDK implementations
│   └── typescript/                   # TypeScript SDK
│       ├── src/
│       │   ├── index.ts              # Main SDK class
│       │   └── types.ts              # Type definitions
│       └── package.json              # NPM package config
└── simulator/                         # Interactive simulator
    └── index.html                    # 5-tab simulator
```

---

## 🆔 Decentralized Identifiers (DIDs)

### What are DIDs?

Decentralized Identifiers are globally unique identifiers that you create and control without permission from any central authority. Unlike email addresses or usernames owned by platforms, DIDs are yours forever.

### DID Methods Supported

| Method | Description | Use Case |
|--------|-------------|----------|
| `did:ethr` | Ethereum-based | Ethereum ecosystem, DeFi |
| `did:key` | Key-derived | Simple, offline use |
| `did:web` | Web-based | Organizations with domains |
| `did:ion` | Bitcoin-anchored | High security |
| `did:sov` | Sovrin ledger | Enterprise SSI |
| `did:peer` | Peer-to-peer | Private relationships |

### Creating DIDs

```typescript
// Ethereum DID
const ethDID = await identity.createDID({
  method: 'ethr',
  network: 'mainnet'
});
// Result: did:ethr:0x3b0BC51Ab9De1e5B7B6E34E5b960285805C41736

// Key-based DID (simplest)
const keyDID = await identity.createDID({
  method: 'key',
  keyType: 'Ed25519'
});
// Result: did:key:z6MkpTHR8VNsBxYAAWHut2Geadd9jSwuBV8xRoAnwWsdvktH

// Web DID (for organizations)
const webDID = await identity.createDID({
  method: 'web',
  domain: 'example.com'
});
// Result: did:web:example.com
```

### Resolving DIDs

```typescript
const resolution = await identity.resolveDID('did:ethr:0x3b0BC51...');

console.log(resolution.didDocument);
// {
//   "@context": ["https://www.w3.org/ns/did/v1"],
//   "id": "did:ethr:0x3b0BC51...",
//   "authentication": [...],
//   "assertionMethod": [...],
//   "keyAgreement": [...]
// }
```

---

## 📜 Verifiable Credentials

### What are Verifiable Credentials?

Tamper-proof digital credentials with cryptographic signatures. Like physical credentials (diplomas, licenses, IDs) but digital, instantly verifiable, and user-controlled.

### Credential Types

- **Education:** University degrees, certificates, transcripts
- **Identity:** Government IDs, driver's licenses, passports
- **Financial:** KYC credentials, credit scores, bank accounts
- **Professional:** Licenses, certifications, employment
- **Health:** Vaccination records, medical credentials

### Issuing Credentials

```typescript
const credential = await identity.issueCredential({
  issuer: 'did:example:university',
  credentialSubject: {
    id: 'did:example:student',
    degree: {
      type: 'BachelorDegree',
      name: 'Bachelor of Science',
      gpa: 3.85,
      graduationDate: '2023-05-15'
    }
  },
  type: ['VerifiableCredential', 'UniversityDegreeCredential'],
  expirationDate: '2028-05-14T23:59:59Z'
});
```

### Verifying Credentials

```typescript
const result = await identity.verifyCredential(credential, {
  checkStatus: true,
  checkExpiration: true,
  checkIssuerTrust: true
});

if (result.verified) {
  console.log('Credential is valid!');
  console.log('Signature:', result.checks.signature);
  console.log('Not expired:', result.checks.expiration);
  console.log('Not revoked:', result.checks.revocation);
}
```

### Selective Disclosure

Share only specific attributes, hide the rest:

```typescript
// Student can prove they have a degree without revealing GPA
const presentation = await identity.createPresentation({
  holder: 'did:example:student',
  verifiableCredentials: [credential],
  selectiveDisclosure: {
    reveal: ['degree.type', 'degree.name'],
    hide: ['degree.gpa', 'degree.graduationDate']
  },
  challenge: 'nonce_from_verifier'
});
```

---

## 🛡️ Zero-Knowledge Proofs

### Prove Without Revealing

Zero-knowledge proofs let you prove facts about yourself without revealing underlying data:

- Prove age > 18 without revealing exact birthdate
- Prove income in range without revealing exact salary
- Prove credential validity without showing full credential
- Prove group membership without revealing identity

### Age Verification Example

```typescript
// Prove you're over 18 without revealing birthdate
const ageProof = await identity.generateAgeProof({
  birthdate: '1995-06-15',  // Private, never shared
  minimumAge: 18
});

// Verifier checks proof
const isValid = await identity.verifyZKProof(ageProof);
console.log('Over 18:', isValid);  // true
// Verifier learns ONLY: "age >= 18"
// Verifier NEVER learns: actual birthdate, exact age
```

### Range Proofs

```typescript
// Prove income in range for loan qualification
const incomeProof = await identity.generateRangeProof({
  value: 75000,              // Private
  minimum: 50000,            // Required range
  maximum: 100000
});
```

---

## 👤 Biometric Authentication

### Supported Biometrics

- **Facial Recognition:** Front-facing camera
- **Fingerprint:** Touch sensor
- **Iris Scan:** Specialized cameras
- **Voice Recognition:** Microphone
- **Behavioral:** Typing patterns, gait

### Enrollment

```typescript
const enrollment = await identity.enrollBiometric({
  did: 'did:example:user',
  modality: 'facial',
  biometricData: base64EncodedImage,
  livenessProof: {
    type: 'LivenessProof',
    method: 'passive',
    timestamp: new Date().toISOString(),
    confidence: 0.98,
    indicators: {
      textureAnalysis: true,
      depthSensing: true,
      microExpressions: true
    }
  }
});

console.log('Biometric enrolled:', enrollment.templateId);
```

### Verification

```typescript
const verification = await identity.verifyBiometric({
  did: 'did:example:user',
  modality: 'facial',
  biometricData: base64EncodedSelfie,
  livenessProof: livenessDetectionResult
});

console.log('Verified:', verification.verified);
console.log('Confidence:', verification.confidence);  // 0.98 (98%)
console.log('Match Score:', verification.matchScore); // 0.95 (95%)
```

### Privacy Protection

- **Template Protection:** Irreversible mathematical transformations
- **Cancelable Biometrics:** Generate new templates if compromised
- **On-Device Processing:** Raw biometrics never leave your device

---

## 📋 eKYC (Electronic Know Your Customer)

### What is eKYC?

Digital identity verification for financial services compliance. Required by law to prevent fraud, money laundering, and terrorist financing.

### KYC Levels

| Level | Requirements | Use Cases |
|-------|--------------|-----------|
| **Level 1** | Basic info (name, DOB, address) | Low-value accounts (< $1000) |
| **Level 2** | Document verification + selfie | Standard accounts (< $10k) |
| **Level 3** | Enhanced due diligence, source of funds | High-value accounts |
| **Level 4** | Continuous monitoring, sanctions screening | Institutional, high-risk |

### eKYC Process

```typescript
// 1. Initiate KYC
const session = await identity.initiateKYC({
  did: 'did:example:user',
  level: 2,
  documentType: 'passport',
  countryCode: 'US'
});

console.log('Upload URL:', session.uploadUrl);

// 2. Submit documents
await identity.submitKYCDocuments(session.sessionId, {
  document: passportImage,
  selfie: selfieImage
});

// 3. Check status
const status = await identity.getKYCStatus(session.sessionId);

if (status.status === 'approved') {
  console.log('KYC Level:', status.level);
  console.log('Credential:', status.credential);
}
```

### What Happens During eKYC?

1. **Document Verification:** OCR extracts data, validates security features
2. **Biometric Matching:** Selfie compared to document photo
3. **Liveness Detection:** Ensures real person, not photo/video
4. **Database Checks:** Verify against government databases
5. **Sanctions Screening:** Check watchlists (OFAC, UN, etc.)
6. **Risk Assessment:** Algorithmic fraud detection
7. **Credential Issuance:** Issue KYC credential if approved

---

## 👛 Digital Wallets

### What is an SSI Wallet?

Your digital wallet stores DIDs, credentials, and cryptographic keys. Like a physical wallet but for digital identity.

### Creating a Wallet

```typescript
const wallet = await identity.createWallet({
  ownerDid: 'did:example:user',
  backupMethod: 'encrypted_cloud'
});

console.log('Wallet ID:', wallet.walletId);
console.log('Recovery Phrase:', wallet.recoveryPhrase);
// IMPORTANT: Save this recovery phrase securely!
```

### Managing Credentials

```typescript
// Store credential
await identity.storeCredential(
  wallet.walletId,
  universityDegreeCredential,
  ['education', 'university', 'degree']
);

// List all credentials
const credentials = await identity.listCredentials(wallet.walletId);

// Filter by type
const degrees = await identity.listCredentials(wallet.walletId, {
  type: 'UniversityDegreeCredential'
});

// Delete credential
await identity.deleteCredential(wallet.walletId, credentialId);
```

---

## 🌍 Real-World Use Cases

### Financial Services

**Digital Banking Onboarding:**
1. Customer completes eKYC via mobile app (2 minutes)
2. Receives KYC credential in digital wallet
3. Opens accounts at multiple banks with one credential
4. No repeated identity verification

**Cross-Border Payments:**
- DIDs identify sender and receiver
- Travel Rule compliance via credential exchange
- Instant verification without central registry

### Healthcare

**Medical Records Management:**
- Patient DID controls access to health records
- Vaccination credentials for travel
- Prescription credentials prevent fraud
- Insurance claim automation

### Education

**Academic Credentials:**
- Universities issue degree credentials
- Students store in digital wallet
- Employers verify instantly
- Prevents degree fraud

### Government

**Digital Citizen Services:**
- National ID as verifiable credential
- Tax filing with DID authentication
- Voting systems using identity proofs
- Benefits distribution

### Travel

**Seamless Border Crossing:**
- Digital travel credentials
- Biometric verification at airports
- Hotel check-in without physical documents
- Rental car verification

---

## 🔗 WIA Ecosystem Integration

### Integration with Other WIA Standards

```
Digital Identity (WIA-FIN-010)
    ↓
    ├→ Blockchain Finance (WIA-FIN-002): DID anchoring on blockchains
    ├→ Cryptocurrency (WIA-FIN-003): Identity for crypto wallets, KYC for exchanges
    ├→ DeFi (WIA-FIN-004): Reputation credentials, credit scores
    └→ Smart Contracts (WIA-FIN-007): Identity-gated contract execution
```

### Example: DeFi Lending with Identity

```typescript
// 1. Create identity
const did = await identity.createDID();

// 2. Complete KYC (WIA-FIN-010)
const kycCredential = await identity.completeKYC(did, {level: 3});

// 3. Access DeFi platform (WIA-FIN-004)
const defiAccess = await defi.requestAccess({
  did: did,
  credentials: [kycCredential]
});

// 4. Execute smart contract (WIA-FIN-007)
const loanContract = await smartContract.execute({
  did: did,
  function: "takeLoan",
  amount: 10000,
  authorization: kycCredential
});

// 5. Repay with cryptocurrency (WIA-FIN-003)
await crypto.transfer({
  from: did,
  to: loanContract.address,
  amount: 10500,
  currency: "USDC"
});
```

---

## 🏆 WIA Certification

### Certification Levels

#### Level 1: Registered
- Basic WIA-FIN-010 compliance
- Listed in WIA directory
- Use WIA Registered badge

#### Level 2: Verified
- Pass technical audit
- Security code review
- Interoperability testing
- WIA Verified badge

#### Level 3: Certified
- Third-party security audit
- Production deployment (99.9% uptime)
- 24/7 support
- WIA Certified mark

### How to Get Certified

1. **Register:** https://cert.wia.live
2. **Implement:** Build compliant system
3. **Test:** Pass interoperability tests
4. **Audit:** Security review
5. **Deploy:** Production environment
6. **Certify:** Receive certification

---

## 📚 Documentation

### Technical Specifications

- [Phase 1: Data Format](./spec/PHASE-1-DATA-FORMAT.md) - Schemas, formats, encodings
- [Phase 2: API Interface](./spec/PHASE-2-API.md) - REST APIs, endpoints, SDKs
- [Phase 3: Protocol](./spec/PHASE-3-PROTOCOL.md) - DID resolution, credential exchange
- [Phase 4: Integration](./spec/PHASE-4-INTEGRATION.md) - WIA ecosystem, certification

### Educational Ebook

Comprehensive 8-chapter guide:

1. **Introduction to Digital Identity** - Evolution and fundamentals
2. **Decentralized Identifiers (DIDs)** - W3C DID specification
3. **Verifiable Credentials** - Issuance and verification
4. **Self-Sovereign Identity (SSI)** - Architecture and principles
5. **Zero-Knowledge Proofs & Privacy** - Advanced cryptography
6. **Biometric Authentication** - Face, fingerprint, liveness
7. **eKYC & Regulatory Compliance** - AML, GDPR, CCPA
8. **WIA Integration & Future** - Ecosystem and roadmap

**Read the Ebook:**
- [English Version](./ebook/en/index.html)
- [한국어 버전](./ebook/ko/index.html)

### Interactive Simulator

Try identity operations in your browser:
- [Digital Identity Simulator](./simulator/index.html)

**5 Interactive Tabs:**
1. DID Document Generator
2. Verifiable Credential Creator
3. Identity Verification Flow
4. SSI Wallet Simulator
5. Zero-Knowledge Proof Demo

---

## 🛠️ Development

### Prerequisites

- Node.js ≥ 18.0.0
- TypeScript ≥ 5.0.0
- Git

### Installation

```bash
# Clone repository
git clone https://github.com/WIA-Official/wia-standards.git
cd wia-standards/digital-identity-fin

# Install dependencies
cd api/typescript
npm install

# Build
npm run build

# Run tests
npm test

# Lint
npm run lint
```

### Testing

```bash
# Unit tests
npm test

# Integration tests
npm run test:integration

# Coverage report
npm run test:coverage
```

---

## 🤝 Contributing

We welcome contributions from the community!

### Development Setup

```bash
# Fork and clone
git clone https://github.com/YOUR_USERNAME/wia-standards.git
cd wia-standards/digital-identity-fin

# Create feature branch
git checkout -b feature/amazing-feature

# Make changes, write tests
npm test

# Commit
git commit -m 'Add amazing feature'

# Push
git push origin feature/amazing-feature

# Open Pull Request
```

### Contribution Guidelines

1. Fork the repository
2. Create a feature branch
3. Write tests for new features
4. Ensure all tests pass
5. Update documentation
6. Submit pull request

---

## 📄 License

This standard is distributed under the **MIT License**.

```
Copyright © 2025 WIA - World Interoperability Alliance

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
```

---

## 🔗 Resources

### Official Links

- **Standard Homepage**: https://identity.wia.live
- **GitHub Repository**: https://github.com/WIA-Official/wia-standards
- **WIA Website**: https://wia.live
- **Certification Portal**: https://cert.wia.live
- **Developer Docs**: https://docs.identity.wia.live

### Community

- **Discord**: https://discord.gg/wia-standards
- **Twitter**: @WIA_Official
- **Forum**: https://forum.wia.live
- **Newsletter**: Subscribe at wia.live/newsletter

### Related Standards

- **WIA-FIN-002**: [Blockchain Finance](../blockchain-finance/)
- **WIA-FIN-003**: [Cryptocurrency](../cryptocurrency/)
- **WIA-FIN-004**: [DeFi](../defi/)
- **WIA-FIN-007**: [Smart Contracts](../smart-contract/)

### External Resources

- **W3C DID Core**: https://www.w3.org/TR/did-core/
- **W3C Verifiable Credentials**: https://www.w3.org/TR/vc-data-model/
- **Decentralized Identity Foundation**: https://identity.foundation/
- **NIST Digital Identity Guidelines**: https://pages.nist.gov/800-63-3/

---

## 📞 Support

### Technical Support

- **Email**: support@identity.wia.live
- **Discord**: #digital-identity-support
- **GitHub Issues**: Report bugs or request features
- **Office Hours**: Every Tuesday 10AM-11AM UTC

### Business Inquiries

- **Partnerships**: partnerships@wia.live
- **Certification**: certification@wia.live
- **Press**: press@wia.live

---

## 🗺️ Roadmap

### 2025 Q1-Q2 ✅
- [x] Standard specification v1.0
- [x] TypeScript SDK
- [x] Reference implementation
- [x] Interactive simulator
- [x] Comprehensive ebook

### 2025 Q3-Q4
- [ ] Mobile SDKs (iOS/Android)
- [ ] Python, Go, Rust SDKs
- [ ] Biometric passport support
- [ ] Hardware wallet integration

### 2026
- [ ] AI-powered identity verification
- [ ] Quantum-resistant cryptography
- [ ] Metaverse identity integration
- [ ] 100+ certified implementations

### 2027+
- [ ] Universal digital identity for all
- [ ] Self-sovereign AI agents
- [ ] IoT device identities
- [ ] Global interoperability framework

---

## 🌟 Acknowledgments

This standard was developed with contributions from:

- **W3C DID & VC Working Groups**
- **Decentralized Identity Foundation**
- **Sovrin Foundation**
- **Ethereum Community**
- **OpenID Foundation**
- **University Researchers**
- **Enterprise Partners**
- **WIA Community Contributors**

---

<div align="center">

**홍익인간 (弘益人間) - Benefit All Humanity**

*Empowering everyone with self-sovereign digital identity*

---

**WIA Digital Identity Standard (WIA-FIN-010) v1.0.0**

© 2025 WIA - World Interoperability Alliance

[Website](https://identity.wia.live) · [GitHub](https://github.com/WIA-Official) · [Twitter](https://twitter.com/WIA_Official) · [Discord](https://discord.gg/wia-standards)

</div>