How To Integrate Digi-ID On Your Website (Developer Guide)

Digi-ID is a decentralized authentication system built within the DigiByte ecosystem. It allows websites to replace usernames and passwords with secure cryptographic login using digital signatures.

This guide explains how developers can integrate Digi-ID authentication into their website backend securely and correctly.

Technical Overview

Digi-ID authentication is based on public-key cryptography. Instead of storing passwords, your website verifies a signed authentication challenge generated by the user’s DigiByte wallet.

The high-level authentication flow:

1. Your server generates a unique login challenge.
2. The challenge is encoded into a Digi-ID URI and displayed as a QR code.
3. The user scans the QR code with a DigiByte wallet supporting Digi-ID.
4. The wallet signs the challenge using the user's private key.
5. The signed payload is sent back to your server.
6. Your server verifies the signature using the provided public key.
7. If valid, you create an authenticated session.

No passwords are stored at any stage.

Step 1: Generate a Secure Login Challenge

Each authentication request must include a unique challenge string. This should:

• Contain a cryptographically secure random nonce
• Include your domain name
• Include a timestamp
• Expire after a short window (recommended: 5 minutes)

Example structure:

domain=yourdomain.com
nonce=948374928374
timestamp=1700000000

Store the nonce server-side and mark it as unused until verification.

Step 2: Create the Digi-ID URI

The challenge must be formatted into a Digi-ID URI scheme.

digiid://yourdomain.com/login?challenge=encoded_challenge_string

This URI is then converted into a QR code for display on your login page.

When scanned, compatible DigiByte wallets recognize the Digi-ID protocol and prompt the user for authentication approval.

Step 3: Handle the Callback Endpoint

After the user approves the login request, the wallet sends a signed response to your predefined callback endpoint.

The response typically includes:

• The original challenge string
• The user’s public key (or derived address)
• The digital signature

This endpoint must validate the request before creating any session.

Step 4: Verify the Cryptographic Signature

This is the most critical part of the integration.

Your server must verify:

• The signature matches the original challenge string
• The challenge has not expired
• The nonce has not been previously used
• The public key correctly validates the signature

Digi-ID uses ECDSA cryptographic verification compatible with DigiByte's address structure.

If verification fails, authentication must be rejected.

Step 5: Create or Link a User Account

Once verification succeeds, you can:

• Create a new user account tied to the public key
• Or match the public key to an existing account

The public key (or derived DigiByte address) becomes the user’s unique identifier within your system.

No email address is required unless your application specifically requests one.

Security Best Practices

Use HTTPS

All Digi-ID authentication endpoints must be served over SSL.

Enforce One-Time Nonces

Invalidate the nonce immediately after successful verification to prevent replay attacks.

Set Short Expiration Windows

Challenge strings should expire quickly to reduce attack exposure.

Implement Rate Limiting

Protect your callback endpoint against automated abuse.

Secure Session Management

Use secure, HTTP-only cookies and regenerate session IDs upon login.

Advantages of Digi-ID Integration

• No password database liability
• Reduced risk of large-scale data breaches
• Lower infrastructure complexity
• Modern decentralized authentication model
• Improved user privacy

Digi-ID removes the need for password resets, credential storage, and centralized authentication servers.

Limitations To Consider

• Users must have a DigiByte wallet supporting Digi-ID
• Some user education may be required
• Integration requires backend cryptographic verification

Despite these considerations, Digi-ID offers a highly secure alternative to traditional login systems.

Conclusion

Digi-ID provides developers with a decentralized, passwordless authentication method built on proven cryptographic principles. By implementing Digi-ID, websites can eliminate stored credentials while improving user security.

As passwordless authentication becomes more common across the web, blockchain-based login systems like Digi-ID represent a forward-looking solution for secure digital identity.