Wyo. Const. art. 16, § 8: Endorsements required on bonds and other evidences of indebtedness.

No bond or evidence of indebtedness of the state shall be valid unless the same shall have endorsed thereon a certificate signed by the auditor and secretary of state that the bond or evidence of debt is issued pursuant to law and is within the debt limit. No bond or evidence of debt of any county, or bond of any township or other political subdivision, shall be valid unless the same [shall] have endorsed thereon a certificate signed by the county auditor or other officer authorized by law to sign such certificate, stating that said bond or evidence of debt is issued pursuant to law and is within the debt limit.