Services include witnessing the signing of important documents, taking affidavits and depositions and giving oaths. Submit the notarized document for authentication to the County Clerk so it can verify the notary's signature.An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries. Here are 5 steps to performing an acknowledgment. Our on staff notary public's signatures can be authenticated and certified in the county clerks' offices throughout New York. Filling out this authorization letter is straightforward. Our notary is only authorized to witness the signing of documents. They are prohibited from helping prepare or assisting in completing documents. Please visit the Secretary of the Commonwealth Website for the application and to find out more details on becoming a notary public. This sample notarized letter of authorization is fully customizable, and our online PDF Editor makes it easy to adjust the document to suit your needs.