Virtual Notary offers a superset of the document verification service offered by proofofexistence.com.

It's best to think of Virtual Notary as a impartial online witness to factoids that can be checked online. Besides documents, it can attest to the content of web pages, tweets, weather conditions, stock prices, exchange rates, employment status (for those institutions where we know how to check employment status), house features and prices, etc.

It can also issue official, certified random numbers.

Virtual Notary also allows the users to download an independently-verifiable X509 certificate of attestation.