S.C. Code Ann. § 36-9-206
(a) A security interest in favor of a securities intermediary attaches to a person's security entitlement if:
(c) A security interest in favor of a person that delivers a certificated security or other financial asset represented by a writing attaches to the security or other financial asset if:
(1) the security or other financial asset:
(d) The security interest described in subsection (c) secures the obligation to make payment for the delivery.
SUBPART 2. RIGHTS AND DUTIES