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.A Washington notary acknowledgment form is used to officially authenticate a signature on a legal document. A Washington notary acknowledgment form lets a notary public confirm the legitimacy of the signing party's signature and prevents forgery on legal documents. This page includes forms, fees, and instructions for all domestic business entities, foreign and domestic Registered Agents, and Washington Trademarks. Use the samples below to develop or update acknowledgment language for your own use when thanking donors for gifts to your department or center.