Ohio Revised Code Title XIII. Commercial Transactions § 1308.04

(A) Unless specifically denied in the pleadings, each signature on a security certificate or in a necessary indorsement is admitted;

(B) If the effectiveness of a signature is put in issue, the burden of establishing effectiveness is on the party claiming under the signature, but the signature is presumed to be genuine or authorized;

(C) If signatures on a security certificate are admitted or established, production of the certificate entitles a holder to recover on it unless the defendant establishes a defense or a defect going to the validity of the security;

(D) If it is shown that a defense or defect exists, the plaintiff has the burden of establishing that the plaintiff or some person under whom the plaintiff claims is a person against whom the defense or defect cannot be asserted.