Government Code § 67589

No indenture need be recorded or filed in any public office, other than the office of the commission. The pledge of revenues provided in any indenture shall take effect forthwith as provided therein, and irrespective of the date of receipt of such revenues by the commission or the indenture trustee. Such pledge shall be effective as provided in the indenture without physical delivery of the revenues to the commission or to the indenture trustee.