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Created page with "'''Proof of Existence''' is an online service that verifies the existence of computer files as of a specific time via timestamped transactions in the bitcoin Blo..."

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'''Proof of Existence''' is an online service that verifies the existence of [[computer file]]s as of a specific time via [[timestamp]]ed transactions in the [[bitcoin]] [[Blockchain (database)|blockchain]].

It was launched in 2013 as an [[Open-source software|open source]] project. It was developed by Manuel Araoz and Esteban Ordano.

On May 21, 2017, the "Blockchain Notary Service" was acquired by [[Canaan Creative|Canaan]].

:"I'm really happy to close this deal with Canaan. First and foremost because they understand blockchain technology," Araoz said in a statement. "They've been around for years, and they expend hard dollars to build the chips that secure the blockchain. I'm looking forward to enhancing the product, and exploring other blockchain services."

==Reception==
On May 24, 2013 reporter Jeremy Kirk from [[IDG News Service]] wrote that "It's essentially a [[notary public]] service on the Internet, an inexpensive way of using Bitcoin's distributed computing power to allow people to verify that a document existed at a certain point in time." On May 8, 2014 reporter Daniel Cawrey from [[CoinDesk]] wrote that the service "is an example of how the power of this new technology can have applications far beyond the world of [[finance]], in this case, giving a glimpse of how bitcoin could one day have a substantial impact in the fields of [[intellectual property]] and [[law]]." However, a more accurate time can be calculated from the surrounding blocks if increased precision is necessary.

==Usage==
* Digital Sign Agreement without revealing actual content.
* Demonstrating data ownership without revealing actual data.
* Document time stamping.
* Proving ownership
* Checking for document integrity

== See also ==

* [[Canaan Creative|Canaan]]

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
[[Category:Blockchain services]]
[[Category:Software]]

Proof of Existence - Revision history

Admin: Created page with "'''Proof of Existence''' is an online service that verifies the existence of computer files as of a specific time via timestamped transactions in the bitcoin Blo..."