Your documents. Timestamped. Tamper-proof. Forever.

zkNotary lets you prove that any document existed — unchanged — at a specific point in time. No lawyers. No paperwork. No trust required.

Think of it as a receipt for your document that nobody can fake, edit, or take away.

Your file never leaves your browser

Recorded permanently on Ethereum

Timestamp nobody can alter

Upload your file

Any file, any format. It never leaves your browser — we only use a digital fingerprint of its contents.

A unique digital fingerprint is created from your document's contents. Change one character and the fingerprint changes.

That fingerprint is permanently stamped on the blockchain — public, timestamped, and unchangeable.