No matter the end user this is a damn significant amount of possible hash rate. Of course, more info would babe great.
I do however not believe anyone needs to worry about a 51% attack. With only projected hash rate by year end from KNC, BFL (without ramping up production speed), Bitfury and already sold Avalon chips + ASICMINER we are prob looking at a network hash OVER 20 Petahash by year end anyway. And I consider that a low estimate.
Could you perhaps elaborate on that? I don't know how that can be a low estimate, the estimates I have seen so far are 1000 TH by fall and maybe 2000-3000 TH by year end. To me 20000 TH sounds a bit much, not on the low end. But perhaps I have less information than you do on the quantities of chips that are supposed to be out there in the wild by year end.
You do the math:
100s of KNC 400 gh/s miners
At least 340 Bitfury 120 gh/s miners
1000s of 5-60 gh/s BFL miners
100+ orders of 10k Avalon 300mh/s chips
If at least 50% of these miners/chips deliver.. Well... You can see for yourself