Streets and Highways Code § 18126
CHAPTER 7. Sale and Redemption of Delinquent Property
The redemption money shall be paid by the tax collector to the person holding the original certificate of sale upon his delivering up such certificate and receipting for the amount received from the tax collector therefor. Upon redemption of any lot or parcel of land the tax collector shall enter the fact and date of such redemption upon the duplicate certificate of sale thereof.