S.D. Codified Laws § 51A-5-9
Before qualifying or serving in this state in any fiduciary capacity, as defined in § 51A-5-8, the bank or trust company shall file in the Office of the Secretary of State of South Dakota, a copy of its charter certified by its secretary under its corporate seal, and a power of attorney designating the secretary of state or the secretary of state's successor in office as the person upon whom all notices and processes issued by any court of this state may be served in any action or proceeding relating to any trust, estate, or matter within this state in respect of which the bank or trust company is acting in any fiduciary capacity with like effect as personal service on the bank or trust company. The power of attorney is irrevocable so long as any liability remains outstanding against the bank or trust company in this state. Service of process under this section may be made in the manner provided in chapter 59-11.
SDCL 51A-5-9