February 10, 2019. Difficulty rose by +4.25% to 6.06T from 5.81T.
Change
+4.25%
New difficulty
6.06T
Period length
13.4 days
Network hashrate then (7-day)
44.7 EH/s
Bitcoin price then
$3,512
Hashprice then
$145/PH/day
The 2,016 blocks before it took 13.4 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 4.25%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.