Ohio Rev. Code § 5310.06
All money received by the clerk of the probate court or the clerk of the court of common pleas under section 5310.05 of the Revised Code shall be paid at least once a month to the treasurer of state, who shall, with the advice and approval of the secretary of state and the auditor of state, invest, reinvest, and keep invested such funds in bonds and securities of the United States, or of this state, or of any county, township, district, or municipal corporation of this state, or in approved mortgages on incomeproducing lands that are registered, provided that no loan shall be made by mortgage on any land which is not assessed, at the latest general assessment, for at least twice the amount of the loan, exclusive of improvements.
R.C. §5310.06