Missouri Verification of Signed Original Document is a document certified by the Missouri Secretary of State that verifies the authenticity of a document and its signature. It is a form of authentication that can be used to prove that a document is valid and that the signature on the document is genuine. There are two types of Missouri Verification of Signed Original Document: Notarized Verification and Certified Verification. A Notarized Verification is signed and notarized by a notary public and attests to the authenticity of the document and the signature. A Certified Verification is signed by the Secretary of State, or a designated agent, and certifies to the authenticity of the document and the signature. Both types of verification can be used to authenticate documents for legal or business purposes.