But I assume they might use one of the schemes used by banks when setting up online accounts, or even by the TSA when you forget your ID and want to board a plane. They look at public/commercial records to come up with questions that only you should be able to answer.
Stuff like "DMV records show you own a Toyota Camry, what is the model year?," "which of these best describes your monthly payment on your mortgage?" or "which of these lenders holds one of your student loans?"
You can read more on Experian's KBA here: https://www.experian.com/products/pdf/knowledge_iq.pdf Or here: https://www.experian.com/esolutions/esolutions/products/frau...
What incompetent lawyer told you that you could use it for the basis of your service? Moreover, what incompetent lawyer told you that you could offer such a state-specific thing as notarization services nationwide?
Moreover, this system of "verification" merely proves that the person being examined knows publicly purchasable facts about the alleged identity they claim. (All of the data used by these systems comes from public records, all of which can be accessed for free or for a fee.)