Now, tell me how are you trying to deal with the confirmations times for the whole transactions that will be made while trading?
Shareholders will be able to set the number of confirmations required for each blockchain by voting with their stake. The number of confirmations required applies to orders placed. The blockchain has already famously solved the double spend problem. We will use the same approach to detect and invalidate double orders.
On a separate note, we have added woodstockmerkle as a developer to the NuBits/B&C Exchange team. He will be helping us 5 to 10 hours a week. While his first assignment is working on a NuBit release, having him do so will increase sigmike's availability to work on B&C Exchange.
We are also looking for another developer. Details about the opening are
available here.