From [1] I think the issue is that you want the total output of the transaction to be less than or equal to the input, to ensure a transaction doesn't create va

From [1] I think the issue is that you want the total output of the transaction to be less than or equal to the input, to ensure a transaction doesn't create value. The negative total output is less than any nonnegative input. [1] https://bitcointalk.org/index.php?topic=822.msg9503#msg9503 https://bitcointalk.org/index.php?topic=822.msg9503#msg9503