Cal. CIV § 3447

The undertaking shall be conditioned that, if it is determined in the action that the transfer or obligation was voidable as to the creditor, the transferee will pay to the creditor the lesser of the following amounts: (a) The value of the property or obligation as estimated in the undertaking. (b) The amount determined in the action to be due and owing to the creditor by the person who transferred the property or incurred the obligation.