Bitcoin.comCreated with Notary

Prove ownership on the Bitcoin Cash (BCH) Blockchain for only 0.00005 BCH .

Select Your document

Add your file by dragging it into the browser or using the file selector below.

Fund Your Anchor

Send Bitcoin Cash (BCH) to the address provided and fund your blockchain anchor.

Sign To The Blockchain

Your file will be forever signed into the blockchain with a unique address and timestamp.

View Your Proof

See your proof on the blockchain by checking the transaction in a block explorer.

Get Started

Drag a file into the browser window. Your file will not be uploaded to our server. Learn more.

Document Privacy

Your file never leaves your computer. Rather, your web browser computes the cryptographic hash of your file, and that is the only data sent to us. We know nothing about the contents of your document.

How it works

  1. Add your file by dragging it into the browser or using the file selector above.
  2. Follow the prompt to send Bitcoin Cash (BCH) and fund your blockchain anchor.
  3. See your proof on the blockchain by checking the transaction in a block explorer.

Be your own Notary

Prove timestamped existence of a document without trusted third parties.


Historically, governments acted as trusted third parties by issuing important life documents (like property titles, drivers licenses, and birth certificates).

Pre-bitcoin document proof was characterized by Greco-Roman columns, long lines, unpleasant demeanors, ceremonial vestments, and poor building maintenance.

Today, these roles can be automated.


With Notary, you can create your own universal timestamped proof of a document's existence.

A cryptographic digest of your document will be stored in the Bitcoin Cash (BCH) blockchain, linking it to the time of submission.

Your document could be anything, from an input-constrained form like conventional government documents to a full-resolution movie or location-stamped image.


Trustlessly backing up important documents allows you to prove existence even when an official version goes missing.

You control your own information — your document's contents are not stored in the blockchain or ever exposed.

Prove your document existed by comparing the blockchain entry of your document's cryptographic digest to your actual document (if and when the need arises).


Prove data ownership

In most jurisdictions, applying for a patent or proving ownership of copyrighted material involves unpleasant (and wildly expensive) third parties. With Notary, you can prove ownership of information at a given time without revealing the actual information.

Example 1: United States Patent Office versus personal use of Notary


U.S. Patent Office


Costs more than $10,000 USD and takes more than a year to process
Can only be upheld by expensive third parties in robes
Immediate, inexpensive confirmation
Trivially upheld by supra-legal mathematical postulates
Participation is voluntary

Prove data integrity

Some documents, like property titles, have important consequences linked to changes in the document over time. You can use Notary to prove that a document has existed in an unchanged form. Prove your document did not change by matching your file's cryptographic digest at some future date to the one you stored in the blockchain with Notary.

Example 2: Conventional Title Insurance versus personal use of Notary


Title Insurance


Costs about $5,000
Mostly exists to promote illusion of ownership
Ultimately subject to political climate
May be violently over-ruled, but never deleted or disproven
Participation is voluntary

Prove data existed at a certain time

The Bitcoin Cash (BCH) blockchain is globally distributed and requires proof of work to update. Your submission forever proves the existence of your document in its current state at the time of your submission.

Example 3: Government-issued Birth Certificate versus selfie with infant, added to Notary


Birth Certificate


Physically degrades with time
Can only be accessed by calling parents, waiting, and hoping
Validity depends on trusted issuer
Immutable; permanently and privately accessible from your phone
Participation is voluntary

Practical considerations

In most of the world, humans are still required to participate in multiple forms of conventional document proof. As reputation and identity become key components of the digital world, the existence of a voluntary alternative will support information privacy and ownership.

Recent documents registered

  Document Hash Timestamp
9e6cf891e5fbbefb​7976038731d63246​e8cb26cdeeb54229​2c9dc439210bc18b 2019-01-15 19:58:33 UTC
2595144aae026bee​43f632765e89652f​818c641c0b6707ba​fb89d4e30a109d2a 2019-01-14 10:57:01 UTC
3e7ae050df3bf512​7af5132b458742db​5839894e1541b088​585999cd67d8f531 2019-01-14 10:53:52 UTC
c058b0d456d7677e​a3821077f64637ea​18779263df6df192​a8c7958e19bc1cba 2019-01-14 04:03:43 UTC
68faffc1c19588fc​515f980583f388f8​ff76745601fe7d2b​9a3ff56199eb4cb5 2019-01-14 03:44:05 UTC

Recent blockchain anchors

  Document Hash Timestamp
2595144aae026bee​43f632765e89652f​818c641c0b6707ba​fb89d4e30a109d2a 2019-01-14 11:23:50 UTC
8b1020de942bb93e​03d9e768c696e044​4ec0a30ffb00e55f​aab48d9f537f7410 2019-01-13 08:25:03 UTC
a2a1a882a2809fb1​110a1aae294ef093​9d660cf23bc6ba38​0d2e4fc1ec5f1134 2019-01-08 11:37:29 UTC
09712423de5dd8e6​d0f52665404ba48b​fa3f0f195385a157​567f2c61cbd60512 2019-01-03 22:43:26 UTC
3a448804515fdf0f​34a4cf600b8f517d​c212b325f1a97214​27efcafb24cdb3b0 2019-01-03 05:14:39 UTC
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