After any ordinance, notice, resolution, or other proceeding has been published, a copy of the publication, together with the affidavit of publication stating the length of time it has been published, shall be filed with the city auditor. Such affidavit shall be conclusive evidence of the publication. The bill for the publication shall not be audited until such affidavit is filed.
N.D.C.C. § 40-01-10