When a claim against such estate is verified by the oath of a person out of this state, but within the United States, such oath may be made before a notary public, justice of the peace or any judge or clerk of a court of record or a commissioner of such state. When made before a justice of the peace, it must be certified that such officer was a justice of the peace and that his attestation is genuine, by some judge of a court of record or a commissioner of said state; but, when made before either of the other officers specified, no other proof of the taking of such oath is necessary than the certificate of such officer.