A recorded mortgage may be discharged by an entry in the margin of the record thereof, signed by the mortgagee, or his personal representative or assignee, acknowledging the satisfaction of the mortgage in the presence of the recorder, who must certify the acknowledgement in form substantially as follows:
"Signed and acknowledged before me this ... . day of ... . in the year of ... ..
"A.B., Recorder."
Idaho Code § 45-912