Cal. Civ. Code 954.5

(a) Subject to subdivisions (b) and (c), a transfer of a right represented by a judgment excluded from coverage of Division 9 of the Commercial Code by paragraph (9) of subdivision (d) of Section 9109 of the Commercial Code shall be deemed perfected as against third persons upon there being executed and delivered to the transferee an assignment thereof in writing.

(b) As between bona fide assignees of the same right for value without notice, the assignee who first becomes an assignee of record, by filing an acknowledgment of assignment of judgment with the court as provided in Section 673 of the Code of Civil Procedure or otherwise becoming an assignee of record, has priority.

(c) The filing of an acknowledgment of assignment of the judgment with the court under Section 673 of the Code of Civil Procedure is not, of itself, notice to the judgment debtor so as to invalidate any payments made by the judgment debtor that would otherwise be applied to the satisfaction of the judgment.