00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d 125552
So is this the equivalent of brute forcing a 64 bit password?
edit:
I mean a password that is 64 bits long, encrypted with SHA-256.
More than that, as explained above it equals roughly 67 bits.
Then again, do remember the BTC network has GPU power equaling 146 petaFLOPS (146,407 gigaFLOPS) average as of July 2011. That's over a hundred times faster than the Tianhe-1 supercluster that held the #1 position on the top500.org list of the world's most powerful computers.