January 28, 2020. Difficulty rose by +4.67% to 15.47T from 14.78T.
Change
+4.67%
New difficulty
15.47T
Period length
13.4 days
Network hashrate then (7-day)
111.0 EH/s
Bitcoin price then
$8,804
Hashprice then
$146/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 4.67%: an ordinary adjustment. For every machine on the network that is a pay cut of the same size until the next retarget.