Privacy
Last updated 18 October 2026
What this website collects
Nothing on purpose. invariantt.com sets no cookies, runs no analytics, and loads no third-party scripts, fonts or trackers. Every file the site uses is served from invariantt.com itself.
The demos
The refund demo and the certificate verifier run entirely in your browser. The hashes, signatures and demo keys they create stay on your device and are never sent anywhere. They disappear when you close the page.
Hosting
The site is hosted on Cloudflare Pages. Like any web host, Cloudflare processes technical data such as your IP address and browser type to deliver the pages and protect them from abuse. See Cloudflare's privacy policy.
If you email us, we receive your address and whatever you write, and use them only to reply to you. We do not add you to a mailing list or share your message. Email is handled by Google (Gmail). Ask us at any time to delete your messages.
Your rights
Under the GDPR you can ask what personal data we hold about you, and ask us to correct or delete it. You can also complain to your local data protection authority; in the Netherlands that is the Autoriteit Persoonsgegevens.