I suspect some nodes could just collect transaction fees without forwarding the request to the "hub". Even worse, the node could send a fake transaction to the "hub". It takes bitcoin miners 10 minutes to confirm a transactions, so the Nxt network would not know the node sent a fake transaction for at least 10 minutes -- at least after one confirmation on bitcoin's blockchain.
I;m sorry but the above is incorrect.....Nxt block will be every 60,000ms == 1 minutes....we can even reduce it to 10 seconds.
The topic was bitcoin transactions that take 10 minutes on average for one confirmation. There is no reason to believe we can trust anonymous Nxt nodes to perform bitcoin transactions by forwarding them to some "hubs" without serious security and technical implications