Privacy

Updated: May 2026

Cookies we use

The site uses one cookie named dd_voter_id. The cookie is only set when you actively click the Vote button, not automatically when you visit the page.

• Purpose: prevents duplicate votes (1 vote per project per device).
• Contents: a random string (UUID), containing no personal information.
• Duration: 90 days, then it deletes itself.
• HttpOnly: JavaScript cannot read this cookie.
• Not shared with third parties. Not used for advertising, analytics, or cross-site tracking.

Data stored on the server

When you vote, the server only stores a hash of the cookie and IP address — never the original IP or cookie — to check whether a device/network has already voted for that project. The hash is produced by SHA-256 with a private salt and cannot be reversed back to the original IP or cookie.

How to delete the cookie

Open your browser settings → Privacy & Security → Clear site data for the domain vinuni-ai-hackathon.eduwow.io. Or simply open an incognito tab to browse without cookies. Clearing the cookie does not remove a vote already recorded (the server still recognizes you by the IP hash).