Indiana Code Title 5. State and Local Administration § 5-1-7-3

Sec. 3. All contracts so entered into shall be executed in duplicate and one (1) copy thereof shall be kept by the county auditor and one (1) copy shall be delivered to the owner of such bond.  At the time of the execution of such contract, the county auditor shall register all such matured bonds as may be presented for redemption, and all such redemption bonds which are issued to redeem such matured bonds and which are merged in any contract entered into in accordance with the provisions of this chapter, in a record kept in the county auditor's office for that purpose, showing the name and address of the owner of the matured and redemption bond, the amount thereof, the rate of interest, the number of the bond or other identification mark and the amount of the annual payment, including both the partial payment on the principal sum of the redemption bond and the interest which will fall due and be payable on each of the ten (10) dates, respectively, when the county has obligated itself to make such payment, and appropriate entries shall be made in such record as the payments on such redemption bond, principal and interest, are made.