Okla. Stat. tit. 60, § 60-178.10: Conveyance, assignment or other transfer as evidence of

trust existence.

Any conveyance, assignment or other transfer executed in the

name of such trust pursuant to Section 1 of this act and bearing a

signature which purports to be the signature of the president or

chairman of said trust, shall be deemed prima facie evidence that

such trust exists and the conveyance, assignment or other transfer

is the act of the trust and the trustees thereof, that it was duly

executed and signed by the president or chairman of said trust who

were trustees of the trust and that such instrument conforms in all

respects to the requirements of the instrument creating such trust;

and such conveyance, assignment or other transfer shall be

admissible in evidence without further proof of execution.