An assignment or discharge of a mortgage or judgment lien shall be duly recorded in the records of the town. A mortgage or judgment lien may be discharged by the mortgagee, judgment creditor, or assignee of such mortgage or judgment lien in writing on the margin of the mortgage record or judgment lien notice. A satisfaction or assignment of the mortgage or judgment lien recorded elsewhere shall bear a marginal notation of the book and page of the mortgage or judgment lien record and a corresponding cross-reference shall be made on the margin of the mortgage or judgment lien notice record. (Amended 1979, No. 67, § 4.)