Ohio Rev. Code § 4123.83
Each employer paying premiums into the state insurance fund or electing directly to pay compensation to the employer's injured employees or the dependents of the employer's killed employees as provided in section 4123.35 of the Revised Code, shall post conspicuously in the employer's place or places of employment notices, which shall be furnished at least annually by the bureau of workers' compensation. The notice shall state that it is proof of workers' compensation coverage, or that the employer has complied with section 4123.35 of the Revised Code and has been authorized by the administrator of workers' compensation directly to compensate employees or dependents, and the date of the authorization. The notice shall indicate that coverage is contingent on continued payment of premiums and assessments due. The notice, when posted, constitutes sufficient notice to the employer's employees of the fact that the employer carries workers' compensation coverage or that the employer has complied with the elective provisions of section 4123.35 of the Revised Code.
R.C. §4123.83