SDCL § 18-4-10: Identity of person making acknowledgment to be known or proved to officer.

The acknowledgment of an instrument performed in the presence of a person making the acknowledgment must not be taken unless the officer taking it knows or has satisfactory evidence on the oath or affirmation of a credible witness, that the person making such acknowledgment is the individual who is described in and who executed the instrument; or, if executed by a corporation, that the person making such acknowledgment is an officer of the corporation authorized to execute the instrument.