Okla. Stat. tit. 74, § 1226.8

All monies received pursuant to the authority of this act, whether as proceeds from the sale of bonds or as revenues, shall be deemed to be trust funds, to be held and applied solely as provided in this act. The resolution authorizing the bonds of any issue or the trust agreement securing such bonds shall provide that any officer to whom, or any bank or trust company to which, such monies shall be paid shall act as trustee of such monies and shall hold and apply the same for the purposes hereof, subject to such regulations as this act and such resolution or trust agreement may provide.