Said notes shall be known as tax anticipation notes, and by no other name, and on the back of each of said notes there shall appear a certificate that it is issued pursuant to an order of the county commission, the total borrowing power herein authorized and the aggregate principal amount of all prior notes and warrants theretofore issued and registered at that date. Such certificate shall be made by the treasurer of the county wherein such notes are issued and his signature thereto shall constitute conclusive evidence to the holder of such note that the same was duly authorized under and within the powers, limitations and provisions of sections 50.070 to 50.140. Said notes shall be signed by the presiding commissioner of the county commission, attested by the county clerk with the seal of his office affixed thereto.