DCID SDK Documentation

Build complete decentralized identity applications with our SDK suite. The platform consists of two SDKs that work together:

Architecture Overview

How They Work Together

1. **Frontend SDK** runs in your user-facing application (mobile app, browser extension, or web app)
2. **Backend SDK** runs on your server and handles secure operations
3. Frontend connects to your backend via the `apiUrl` configuration
4. Your backend uses the Backend SDK to communicate with the DCID Platform

Frontend SDK

The **Frontend SDK** (`@dcid/sdk`) is for building client-side identity wallets.

Platform Support

Key Features

• Decentralized Identity (DID) creation and management
• Verifiable Credential storage and presentation
• Zero-Knowledge Proof generation
• HSM integration for key security
• OTP authentication flow
• Cross-platform with unified API

Backend SDK

The **Backend SDK** (`@dcid/server-sdk`) is for building servers that handle identity operations.

Language Support

Key Features

• OTP authentication (email/phone)
• JWT token management with auto-refresh
• Credential issuance (SIG and MTP types)
• IPFS credential storage
• Zero-Knowledge proof verification
• Encryption key management (HSM)

Quick Start

1. Set Up Your Backend

// Install: npm install @dcid/server-sdk express

// server.ts
import { DCIDServerSDK } from '@dcid/server-sdk';
import express from 'express';

const sdk = new DCIDServerSDK({
  apiKey: process.env.DCID_API_KEY,
  environment: 'prod'
});

const app = express();
app.use(express.json());

// Auth endpoints for frontend
app.post('/auth/initiate', async (req, res) => {
  const result = await sdk.auth.registerOTP({ email: req.body.email });
  res.json(result);
});

app.post('/auth/confirm', async (req, res) => {
  const result = await sdk.auth.confirmOTP({
    email: req.body.email,
    otp: req.body.code
  });
  res.json(result);
});

app.listen(3001, () => console.log('Server running on :3001'));

2. Connect Your Frontend

Next Steps

Frontend Development

• Frontend Getting Started
• Installation
• Platform Guides (React Native, Extension, Web)
• API Reference

Backend Development

• Backend Getting Started
• Installation
• Server Setup
• API Reference