VISA is typically around 2000 tx/sec, so it'd only saturate at peak. And anyone with gigabit fiber won't be bothered even at peak. If we reach that traffic level, gigabit will probably be fairly widespread by then.
I don't see how those nefarious miners could succeed, unless they were powerful enough to carry out a 51% attack anyway. Otherwise their secret chain will soon fall behind the public chain.
I don't see how those nefarious miners could succeed, unless they were powerful enough to carry out a 51% attack anyway. Otherwise their secret chain will soon fall behind the public chain.