SDCL § 18-4-23: Authentication of certificates of acknowledgment or proof.

Officers taking and certifying acknowledgments or proof of instruments for record must authenticate their certificates by affixing thereto their signatures, followed by the names of their offices; also their seals of office, if by the laws of the state, territory, or country where the acknowledgment or proof is taken or by authority of which they are acting, they are required to have official seals. Judges and clerks of courts of record must authenticate their certificates as aforesaid by affixing thereto the seal of the proper court; and mayors of first and second class municipalities, by the seal thereof.