SDCL § 10-25-8: Completion of service by filing of affidavit--Expiration of right of redemption.

The service of the notice is complete when an affidavit of the service of the notice and of the particular mode of the notice, duly signed and verified by the person or officer making the service, has been filed with the treasurer authorized to execute the tax deed. The record or affidavit is presumptive evidence of the completed service of the notice. The right of redemption from the sale does not expire until sixty days after the filing of affidavit of completed service of the notice.