Ohio Rev. Code Ann. § 1109.06
(A) Whenever a depositor opens or modifies the ownership of a deposit account by designating on the signature card the deposit is in trust for another, and no further notice of the existence and terms of a legal and valid trust is given in writing to the bank, both of the following apply:
(1) The designation on the signature card constitutes clear and convincing evidence of both of the following:
(B) Upon the death of the depositor-trustee of a deposit account designated as provided in division (A) of this section, all of the following apply: