S.D. Codified Laws § 43-30-2
A person shall be deemed to have the unbroken chain of title to an interest in land as such terms are used in this chapter if the official public records of the county wherein such land is situated disclose a conveyance or other title transaction dated and recorded twenty-two years or more prior thereto, which conveyance or other title transaction purports to create such interest in such person or his immediate or remote grantors, with nothing appearing of record purporting to divest such person and his immediate or remote grantors of such purported interest.
"Title transaction" as used herein means any transaction affecting title to real property, including title by will or descent from any persons who held title of record at the date of his death, title by a decree or order of any court, title by tax deed, by trustee's, referee's, conservator's, personal representative's, master's in chancery, or sheriff's deed, as well as by direct conveyance.
SDCL 43-30-2