Ohio Rev. Code § 2108.80: Revocation of declaration of assignment.

A declarant may revoke a written declaration executed under section 2108.70 of the Revised Code by indicating the declarant's desire to revoke the declaration in a document signed and dated by the declarant in the presence of either of the following:

(A) A notary public who shall make the certification described in section 147.53 of the Revised Code.

(B) Two witnesses who are adults and are not related by blood, marriage, or adoption to the declarant.