Every sheriff's certificate of sale made under a power to sell contained in a mortgage shall be prima facie evidence that all the requirements of law in that behalf have been complied with, and prima facie evidence of title in fee thereunder in the purchaser at such sale, the purchaser's heirs or assigns, after the time for redemption therefrom has expired.
Minn. Stat. § 580.19
(9622) RL s 4476; 1986 c 444