Okla. Stat. tit. 6 § 905
Notice to any bank or trust company doing business in this state of an adverse claim to a deposit standing on its books to the credit of any person shall not be effectual to cause said bank or trust company to recognize said adverse claimant unless said adverse claimant shall also either procure a restraining order, injunction or other appropriate process against said bank or trust company from a court of competent jurisdiction in a cause therein instituted by him wherein the person to whose credit the deposit stands is made a party and served with summons or shall execute to said bank or trust company, in form and with sureties acceptable to it, a bond, indemnifying said bank or trust company from any and all liability, loss, damage, costs and expenses, for and on account of the payment of such adverse claim or the dishonor of the check or other order of the person to whose credit the deposit stands on the books of said bank or trust company; provided, that this law shall not apply in any instance where the person to whose credit the deposit stands is a fiduciary for such adverse claimant, and the facts constituting such relationship are made to appear by the affidavit of such claimant.
Okla. Stat. tit. 6, § 905