If that is the case, I seriously see that as an attack vector. I dont know, I'm no cryptographer.

 A tx can only be confirmed when the block is solved, so I do see your reasoning. Its the "locking" part I dont get. Once a tx is boradcast and hits the blockchain, you can't roll back (loool, unless its Vericoin).

 So if the MN ping each other to validate the same tx is being broadcast, anyone with a huge chunk of nodes can subvert InstantX. In this case, it is possible to perform a 51% attack.

 I'm sure this is not the case, Evan is a smart cookie.