Okla. Stat. tit. 46, § 46-11: Defeasance must be recorded

When a grant of real property purports to be an absolute

conveyance, but is intended to be defeasible on the performance of

certain conditions, such grant is not defeated or affected as

against any person other than the grantee or his heirs or devisees

or persons having actual notice, unless an instrument of defeasance,

duly executed and acknowledged, shall have been recorded in the

office of the register of deeds of the county where the property is

situated.