Okla. Stat. tit. 6, § 6-910.7
Property interest
A. Neither a depositor nor a beneficiary has a property
interest in a special deposit.
B. Any property interest with respect to a special deposit is
only in the right to receive payment if the bank is obligated to pay
a beneficiary and not in the special deposit itself. Any property
interest under this subsection is determined under other law.