Cookie Policy

Last Updated: June 30, 2026

This Cookie Policy explains how ChessChain ("we", "us", or "our") uses cookies and similar technologies when you visit our platform at chesschain.club. This policy should be read alongside our Privacy Policy.

1. What Are Cookies?

Cookies are small text files placed on your device (computer, tablet, or mobile) when you visit a website. They are widely used to make websites work more efficiently, provide a better user experience, and supply information to site owners.

We also use similar technologies such as local storage and session storage, which function similarly to cookies for storing data in your browser.

2. Cookies We Use

We use the following categories of cookies on the ChessChain platform:

2.1 Strictly Necessary Cookies

These cookies are essential for the Platform to function and cannot be disabled. They are usually set in response to actions you take, such as logging in or setting privacy preferences.

CookiePurposeDurationType
next-auth.session-tokenAuthentication session (JWT)Session / 30 daysHTTP-only
next-auth.csrf-tokenCSRF protectionSessionHTTP-only
next-auth.callback-urlRedirect URL after loginSessionHTTP-only
lichess_code_verifierLichess OAuth PKCE flow10 minutesHTTP-only

2.2 Functional Cookies

These cookies enable enhanced functionality and personalization, such as remembering your preferences.

StoragePurposeDuration
walletNameRemember selected Solana wallet providerPersistent
themeUser display preferencesPersistent

2.3 Analytics Cookies

These cookies help us understand how visitors interact with the Platform by collecting and reporting information anonymously. We use analytics data to improve Platform performance and user experience.

We may integrate third-party analytics services (such as Vercel Analytics) in the future. Any such integration will be reflected in an update to this policy.

3. Third-Party Cookies

Some cookies may be set by third-party services integrated into the Platform:

  • Solana Wallet Adapters: Wallet providers (Phantom, Solflare) may set their own cookies or local storage items when you connect your wallet.
  • Lichess: When you interact with Lichess through our Platform, Lichess may set cookies subject to their own cookie policy.

We do not control third-party cookies. Please refer to the respective third-party privacy policies for more information.

4. Managing Cookies

You can manage or delete cookies through your browser settings. Most browsers allow you to:

  • View and delete cookies stored by specific websites.
  • Block cookies from specific or all websites.
  • Set preferences for first-party vs. third-party cookies.
  • Receive notifications when a cookie is set.

Please note: Blocking or deleting strictly necessary cookies (such as authentication cookies) will prevent you from logging in and using core Platform features. The Platform requires session cookies to function properly.

5. Local Storage and Session Storage

In addition to cookies, we use browser local storage and session storage for:

  • Caching wallet connection state for the Solana wallet adapter.
  • Storing temporary game state during active chess games.
  • PWA (Progressive Web App) functionality and offline support.

Local storage data persists until explicitly cleared by the user or the application. Session storage is automatically cleared when the browser tab is closed.

6. Updates to This Policy

We may update this Cookie Policy from time to time to reflect changes in our use of cookies or for legal, operational, or regulatory reasons. Changes will be posted on this page with an updated "Last Updated" date.

7. Contact Us

If you have any questions about our use of cookies, please contact us: