With what is the fifth adjustment in the Bitcoin mining difficulty for 2015, the difficulty has increased to a new all time high of 47,427,554,951. Today's increase of 1.59% over February 22nd's difficulty of 46,684,376,317 represents the smallest gain for the network so far this year. The hash rate as of today's change stands at 339,499,662 GH/s.1
An average over the last 504 blocks. ↩