Except as required by section 47-11-02 or a statute other than chapters 59-09, 59-10, 59-11, 59-12, 59-13, 59-14, 59-15, 59-16, 59-17, 59-18, and 59-19, a trust need not be evidenced by a trust instrument, but the creation of an oral trust and its terms, or an amendment or revocation of an oral trust, may be established only by clear and convincing evidence.
N.D.C.C. § 59-12-07