BTC guild pool has the 40% of the total network power.
http://blockchain.info/poolshttp://www.btcguild.com/index.php?page=pool_statsThe guild pool speed has increased +400% in the last 6 weeks.
I dont know how guild pool operates so i ask you:
Is there a possible threat for a 51% attack?
Lets make some calculations:
Gmax = Gn + (k x h)
X = Xn + (k x h)
Gmax : guild pool speed for becoming a 51% threat. (Gh/s)
Gn: guild pool speed now (Gh/s)
X: total network hash rate if Gmax is reached (Gh/s)
Xn: total network hash rate now (Gh/s)
k: number of ASICs
h: ASIC hash rate (Gh/s)
Assume that the network's computation speed (do not include guild pool speed in the networks total hash rate) does not grow so fast as the guild pool speed does.
A good assumption because the networks computation speed has grown +100% in the last 6 weeks Vs a +400% increase in guild pool speed.
http://bitcoin.sipa.be/speed-lin.pngAlso the +100% increase includes the +400% guild pool increase. So the increase of the network's computation speed without including the guild pool increase is less than 100%.
Guild pool has added 16000Gh/s to the network the last 6 weeks. The rest network has added 10000Gh/s to the whole network the last 6 weeks.
So the rest network computation speed has a +40% increase Vs a +400% increase of guild pool speed.
How many ASICs should be added in the guild pool in order to become a threat?
Gmax / X > 0.51 =>
[ Gn + (k x h) ] / [ Xn + (k x h) ] > 0.51 =>
.
.
.
k > [ Gn-0.51Xn ] / [ 0.51h-h ]
Gn = 20000Gh/s
Xn=50000Gh/s
h=60Gh/s
.
.
.
k>187
So 187 ASICs (60Gh/s each) or 11000gh/s must be added to guild pool in order to become a 51% threat assuming that the rest network grows very slowly.
This means that guild pool will reach the threatening point in 3-4 weeks if the situation does not change.