NY doesn't require you to sign in front of a notary. Proof of ownership normally includes a bill of sale.The DMV does not provide a form for a bill of sale. While a bill of sale is generally valid without notarization, there are situations where it becomes a wise precaution. You not need both parties to be physically present at the time of notarization, but you can only notarize for the person who is appearing before you. Notarization is not always necessary for a bill of sale to be legally binding. The requirement depends on the type of property and state laws. The application includes an oath of office, which must be sworn and notarized.