S.D. Codified Laws § 51A-6A-62
Any trust company when acting as fiduciary, and any trust company when holding securities as custodian for a fiduciary, may deposit, or arrange for the deposit, with the federal reserve bank in its district, of any securities the principal and interest of which the United States or any department, agency, or instrumentality of the United States has agreed to pay, or has guaranteed payment, to be credited to one or more accounts on the books of the federal reserve bank in the name of the trust company. Any account used for this purpose shall be designated as a fiduciary or safekeeping account, and other similar securities may be credited to the account. A trust company depositing securities with a federal reserve bank is subject to any rules with respect to the making and maintenance of the deposits as the director may promulgate pursuant to chapter 1-26. The records of the trust company shall always show the ownership of the securities held in the account.
SDCL 51A-6A-62