All registered bonds issued under this act shall be signed by the Governor under the great seal of this state, and attested by the Secretary of State and the State Treasurer. Facsimile signatures and seals may be used as provided in the Registered Public Obligations Act of Oklahoma.¹ The bonds shall have endorsed thereon a certificate signed by the State Auditor and Inspector and Attorney General of the state, showing that such bond is issued pursuant to law and is within the debt limit. It shall also be the duty of the Attorney General as ex officio bond commissioner of the State of Oklahoma to examine into and pass upon any registered bonds so issued, and such registered bonds, when declared by the certificate of said bond commissioner to be issued in accordance with the forms of procedure provided by him, shall be incontestable in any court in the State of Oklahoma.