North Dakota Constitution Art. X, § 17

No bond or evidence of indebtedness of the state is valid unless it has endorsed thereon a certificate, signed by the auditor and secretary of state showing 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 is valid unless it has endorsed thereon a certificate signed by the 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.