21 Pa. Stat. § 702
All satisfactions of mortgages heretofore entered in good faith, at the instance of any mortgagee or assignee of record, on the record of any mortgagee, by virtue of an authorization acknowledging the receipt of the amount due on the mortgage, or a statement of the mortgagee's or assignee's desire to have said mortgage satisfied, or in any other manner other than by a satisfaction entered by the mortgagee or assignee of record personally or by the recorder of deeds or any other person acting under a letter or power of attorney duly executed and acknowledged, are hereby declared to be good and valid and to operate as a complete satisfaction of such mortgage, in like manner as if said mortgage had been personally satisfied by the mortgagee on the margin of the record as provided by law: Provided, That said acknowledgment of the receipt of the amount due, or a statement of the mortgagee's or assignee's desire to have said mortgage satisfied, shall have been duly signed and acknowledged by said mortgagee or assignee of record in due form of law and recorded as mortgages are now recorded, and the record of such instrument or a duly certified copy thereof shall be as good evidence as the original receipt or statement duly proven in any court of justice.
21 P.S. § 702