Neb. Rev. Stat. §§ 76-266
When any conveyance of the title to, or any interest in, or any lien on real estate shall have been made prior to July 24, 1917, to any person or corporation as trustee and no beneficiary is named therein, and no declaration of the terms of the trust shall have been made in writing and recorded in the office of the register of deeds of the county in which such real estate is located, and such person or corporation as trustee has thereafter conveyed said title or interest, or assigned or released said lien, it shall be presumed that such trustee had the power and authority to make such conveyance, assignment or lease. In all actions which may be brought after July 24, 1919, by any person claiming a right or interest in or to said real estate, or a lien thereon adverse to such conveyance, assignment or release by said trustee, the presumption that such trustee had power and authority to make such conveyance, assignment or release shall be conclusive.
Neb. Rev. Stat. §§ 76-266