Idaho Code § 42-2959: Registration of bonds.

Before the bonds are delivered to the purchaser they shall be presented to the county treasurer, who shall register them in a book kept for that purpose, and known as the bond register, in which register he shall enter the number of each bond, the date of issue, the maturity, amount and rate of interest, to whom and when payable, and the proceeds derived from the sale of said bonds shall in all cases be paid by the purchaser thereof to the county treasurer.