A written notice of redemption shall be served on the purchaser and the person making the sale by the person seeking to redeem. If such person redeem as holder of a judgment, notice shall be a certified copy thereof. If such person redeem as holder of a mortgage or other lien, notice shall be a certified copy of the record thereof, together with a certified copy of any assignment to establish his claim, and an affidavit showing the amount then actually due on the lien; and at the same time shall pay to the person making the sale the amount prescribed by §