N.Y. Real Prop. Law § 306
A person taking the acknowledgement or proof of a conveyance must indorse thereupon or attach thereto, a certificate, signed by himself, stating all the matters required to be done, known, or proved on the taking of such acknowledgement or proof; together with the name and substance of the testimony of each witness examined before him, and if a subscribing witness, his place of residence.
Any conveyance which has heretofore been recorded, or which may hereafter be recorded, shall be deemed to have been duly acknowledged or proved and properly authenticated, when ten years have elapsed since such recording; saving, however, the rights of every purchaser in good faith and for a valuable consideration deriving title from the same vendor or grantor, his heirs or devisees, to the same property or any portion thereof, whose conveyance shall have been duly recorded before the said period of ten years shall have elapsed.
N.Y. Real Prop. Law § 306