Cal. Sts. & High. Code § 6511
The treasurer, before delivering any certificate of sale, shall enter the following data in a book kept in his office for that purpose:
(c) The date of sale, the purchaser’s name, and the amount paid.
He shall regularly number the descriptions on the margin of the book, and put a corresponding number on each certificate. He shall enter on the record of the bond the words: “Canceled by sale of the property,” giving the date of such sale.