Wyo. Stat. § 16-5-112: Recitals in securities imparting legality.

Any ordinance authorizing, or any other instrument appertaining to, any refunding public securities may provide that each refunding public security authorized shall recite that it is issued under the authority of this act. The recital shall conclusively impart full compliance with all of the provisions and all public securities issued containing the recital are incontestable for any cause whatsoever after their delivery for value.