January 2, 2014. Difficulty rose by +20.12% to 1.42B from 1.18B.
Change
+20.12%
New difficulty
1.42B
Period length
11.7 days
Network hashrate then (7-day)
0.0 EH/s
Bitcoin price then
$749
Hashprice then
$255,705/PH/day
The 2,016 blocks before it took 11.7 days instead of 14, so the network had more hashrate than the difficulty assumed, and difficulty rose by 20.12%: one of the largest adjustments on record. For every machine on the network that is a pay cut of the same size until the next retarget.