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Capture and timestamp proof of every form you submit online. Powered by Kayros and provable.dev Record proof that you submitted an online form. This extension makes a snapshot of the form right before submission and creates a cryptographic proof that is timestamped. All your information remains private, and you can download it from the extension's side panel, in a .json file that can be viewed with the extension at any time. You must download this file if you want to save your proof! You can save your email address in the extension side panel to be used when you want to send an email with a proof. Your email address is kept in your browser's storage. When sending the email from the extension, do not forget to download the .json file and attach it to the email. Why? Because many form owners do not send you a copy of your submission! And you have the right to prove the exact information that you gave them. Maybe you sent private information, maybe you sent them your ideas! Maybe you are a whistleblower! A detailed technical explanation: the HTML content of the form is saved right before submission, with both questions and answers. The POST request is also recorded. This data is cryptographically hashed to produce a 32-byte identifier for your data(data ID). This identifier is sent to our Kayros indexer, which makes a timestamped record and returns a cryptographic hash (record ID). This record ID is proof that you submitted your data at that time. Kayros only receives your data identifier. Your full information submitted in the form is kept private, and you must download your .json file to store it on your computer or send it to someone else. If you want to prove your digital actions, use our provable.dev tools. If you encounter issues, let us know at kuip.ltd.open@gmail.com and send us the link to the form that you tried and if possible, describe what the issue is (otherwise, we may not be able to help).
Apr 19, 2026
rating_count is the Chrome Web Store ratings count, not a written-review count.
Media assets
Screenshots and videos on the listing.
Has promo video
Whether the listing includes at least one video.
Languages
Declared language locales.
Developer website
Listing exposes a developer website URL.
Contact email
Listing exposes a contact email.
Keyword in name
Case-insensitive substring match in the name.
Keyword in description
Case-insensitive substring match in the description.
Keyword occurrences in description
Count of case-insensitive occurrences in the description.
Category user-count percentile
Share of same-category extensions with fewer users (null if unknown).
These are transparent listing completeness / keyword signals, not a prediction of Chrome Web Store search ranking.