The owner must sign the title certificate as the seller. Heirs may fill out individual Affidavits of Heirship and must have each affidavit notarized.A public notary or a lawyer can notarize a vehicle title. Learn how to complete a NY title transfer. You have two options. The messy one is to cross out your signature, have the buyer sign above your deleted signature, and re-sign in the notary space. Under LA law, the certificate of title must be signed BY THE SELLER in the presence of a NOTARY PUBLIC OR TWO WITNESSES. NY doesn't require you to sign in front of a notary.