Neb. Rev. Stat. § 76-233

Every officer, who shall take the acknowledgment or proof of any deed, shall endorse a certificate thereof signed by himself on the deed, and in such certificate shall truly and specifically set forth the matters hereinbefore required to be done, known or proved, on such acknowledgment or proof, together with the names of the witnesses examined before such officer, and their places of residence, and the substance of the evidence by them given.