Zeylink: The Future of Login.

Tired of password headaches, user churn, and the constant threat of account fraud?

Traditional authentication is broken. Users battle forgotten passwords, leading to frustration, support calls, and churn. Simultaneously, rampant password reuse and shared accounts (streaming, gaming, etc.) pose significant security risks and drain revenue from your platform.

Zeylink fundamentally re-imagines user authentication. It eliminates traditional passwords, offering a seamless, secure login experience that integrates directly with your existing user accounts.

How Zeylink Works for Your Users:

Zeylink orchestrates a secure, multi-stage login and registration process where your website remains the ultimate authority for user identity:

1. Initial Request & QR Code:
   • User clicks "Login with Zeylink" on your website.
   • Your site generates a unique 32-byte session ID nonce and displays a QR code. This QR contains the "zeylink://login?url=" your site's API endpoint, and the nonce.
   • The user scans this QR code with their Zeylink app.
2. Website-Controlled Verification:
   • For new users or account recovery, the app sends an initial request (including the user's email) to your site's backend.
   • Your website then takes over identity verification: It sends a magic link to the user's registered email. This link, once verified by the user (via your site's 2FA or other means), leads to a QR code displaying the actual 32-byte secret key.
3. Secure Key Exchange & Connection:
   • The Zeylink app temporarily stores an encrypted payload from your site.
   • When the user scans the 32-byte secret key QR code (from the verified email), the app uses this key to decrypt the stored payload.
   • Upon successful decryption, the app establishes its first fully authenticated (AES:GCM) connection, signaling registration completion and initiating secure key rotation.
4. Effortless Returning User Login:
   • For returning users, the app (already holding the secret key) establishes a direct, secure connection to your site's backend upon scanning the initial QR code.
   • Your backend generates and securely sends a 4-digit PIN to the app. The user confirms by entering this PIN into the website.
   • They're instantly logged in—no usernames, no passwords, no reset emails.

Core Benefits for Your Platform:

• Eliminate Password Friction: Drastically reduce password reset requests, improving user satisfaction and cutting support costs for returning users.
• Unrivaled Security: Built on advanced, constantly rotating cryptography (perfect forward secrecy) with server-generated, single-use PINs. This neutralizes credential stuffing, brute-force, and offline cracking.
• Combat Account Sharing & Fraud: Our unique single-device authentication ensures only the intended user can access their account, directly combating unauthorized sharing and reducing fraudulent activity—critical for subscription-based models.
• Powerful Anti-Phishing: Automatically enforces IP address matching for direct link logins (e.g., email/SMS), making sophisticated remote phishing attempts virtually impossible.
• Minimize Data Breach Risk: By eliminating static passwords, Zeylink drastically reduces the most common vector for credential theft from your systems.
• Streamlined User Journey: Offers frictionless login for returning users and a clear, secure framework for new user registration and account recovery, empowering your site to build an intuitive experience.

A Complementary & Powerful Integration

Zeylink isn't another Identity Provider (IdP) that takes control of your user data. Instead, it functions as a highly secure, personal digital keychain for your users' existing accounts on your platform.

This means:

• You Retain Control: Your website remains the central point of truth for user accounts and identity management. Zeylink provides the secure mechanism for users to access their accounts on your site, only after your site's own identity verification.
• Decentralized Security: The app itself is decentralized, giving the user control over their secure credentials, which are unique for each website and never revealed to the user.
• Website-Driven Credential Issuance: Zeylink's security fundamentally relies on your website's robust identity verification methods (e.g., email, 2FA) to issue the initial 32-byte secret key, ensuring only legitimate users can establish a secure connection.

The Integration Advantage for Your Platform:

• Our core API is free to integrate and use, providing immense value to your ecosystem at no additional cost to your business.
• We provide robust documentation and PHP support files designed for easy, drop-in deployment (with minor configuration).
• Community Support: While I (the developer) am dedicated to providing assistance, we foster a supportive Discord community for peer-to-peer help, ensuring a smooth deployment journey.

Let's Build a More Secure Future, Together.

Zeylink is ready to redefine authentication, creating a safer and simpler web experience for millions. We are actively seeking strategic partnerships with innovative online platforms and service providers to embed Zeylink's revolutionary authentication. This will enhance security, reduce your support costs, and protect your revenue.