What is a Proof of execution? This is an unusual Notary act that few Notaries have ever done. Yet it is allowed in roughly 45 of the 50 states. A Proof of Execution is an act where a Principal signer signs a document in the presence of a Subscribing Witness. The Subscribing Witness then soon after swears under Oath before a Notary Public that the principal signer signed the document in their presence. This type of notary act is prohibited for Deeds and Powers of Attorney, but for less critical documents is allowed.

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Proof of Execution and basic notary acts in Notary Public 101
http://blog.123notary.com/?p=19500

Which Notary act does not require the personal appearance of the principal signer?
http://blog.123notary.com/?p=19668

Subscribing witnesses explained
http://blog.123notary.com/?p=16707

Glossary Proof of Execution
http://www.123notary.com/glossary/?proof-of-execution

Glossary Power of Attorney
http://www.123notary.com/glossary/?power-of-attorney