The municipality may submit to the state auditor a certified copy of the proceedings for the issuance of any bonds hereunder, including the form of such bonds. Upon the submission of these documents to the state auditor, it shall be the duty of the state auditor to pass upon the validity of such bonds and the regularity of all proceedings in connection therewith. If such proceedings conform to the provisions of this chapter and are otherwise regular in form and if such bonds when delivered and paid for will constitute binding and legal obligations enforceable according to the terms thereof, the state auditor shall so certify in an opinion addressed to the municipality.