Any mortgage shall be discharged upon the record thereof by the register of deeds in whose custody it shall be, whenever there shall be presented to him a certificate executed by the mortgagee, his legal personal representative or assignee, acknowledged or proved or certified as prescribed in sections 76-216 to 76-236, specifying that such mortgage has been paid, or otherwise satisfied and discharged.
Neb. Rev. Stat. §§ 76-253