Massachusetts General Laws Part II. Real and Personal Property and Domestic Relations (Ch. 183-210) Ch. 183, § 33

Whenever, under clause (b) of section thirty or under section forty-one, a certificate of authority is required to be attached, there shall be subjoined or attached to the certificate of proof or acknowledgment a certificate of the secretary of state of the state where the officer taking the acknowledgment resides, under the seal of such state, or a certificate of the clerk of a court of record of such state in the county where said officer resides or where he took such proof or acknowledgment, under the seal of the court, stating that said officer was, at the time of taking such proof or acknowledgment, duly authorized thereto in said state, and that said secretary of state or clerk of court is well acquainted with his handwriting and verily believes the signature affixed to such certificate of proof or acknowledgment is genuine.