Difficulty - BTC.com
#Bitcoin is 19.3 trillion times more secure than it was 10 years ago, 50x more secure than the next best thing. Gold is still as secure as it was in 1934.
Today's mining difficulty adjustment is expected to be the 3rd largest downward adjustment in Bitcoin's history. Interesting to note, three out of the last four largest downward adjustments marked local bottoms. Source: