"In the box are Ad and 2Bd." The service is supposed to destroy only Bd, not 2Bd. And not separately, but both deposits at once when the deal is timed out, or

"In the box are Ad and 2Bd." The service is supposed to destroy only Bd, not 2Bd. And not separately, but both deposits at once when the deal is timed out, or both parties commit that they disagree with each other.