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Authenticity is made of
assertions and authority.

Let's look at how a basic level of authenticity is established.

A person claiming to be John Jones asserts that 

  • he understands a particular document, 
  • he intends to sign it
  • he is competent to sign it, and 
  • he is John Jones.
The basic grade of duly constituted public authority, in the person of a public official, a notary, makes a type of assertion called an attestation. The notary attests that
  • the person signing the document has produced satisfactory evidence that he is John Jones, or is personally known to be John Jones
  • he appears to understand the document
  • he is not inebriated nor is there other evidence that he is incompetent to sign the document
  • there is no evidence of improper influence compelling him to sign (such as the presence of a beneficiary of the matter documented)
By notarizing the document, the notary applies the authority of the state to the document.