|BABA|STAMP
Browser extensions

Stamp what you see, from your browser

Timestamp a web page or a received email in one click. Everything is hashed locally in your browser: only the SHA-256 fingerprint is anchored on-chain. The file and the email never leave your device.

BA | Stamp

Web pages

Capture any web page as a PDF or PNG and anchor its hash on Polygon. Prove that a page existed, exactly as it was, at a point in time.

  • One-click capture from the toolbar
  • Full-page PDF or viewport screenshot
  • Self-verifiable proof, no trust in us
Add to ChromeFirefox — soonSafari — soon

BA | Stamp for Gmail

Email

A badge in Gmail shows whether a received email is stamped. Stamp it to anchor its hash on Polygon and Bitcoin, then download a self-verifiable proof with the original .eml and its DKIM signature.

  • A status badge on every open email
  • Captures the raw .eml with DKIM, on your device
  • Downloadable proof you can verify yourself
Chrome — coming soonFirefox — soonSafari — soon

Every stamp is verifiable without trusting us. Drop the original file or email on the verify page and it recomputes the hash and compares it with the on-chain anchor.