Red triangles: Rising wedges breaking down
Critical support: Reversal level for last bitcoin crash. 68.1% retracement of 2015-2017 bull market. 78.6% retracement of march-september bull market.
Doom level: below this most miners will be mining at loss, only bad things below this price. 78.6% retracement of 2015-2017 bull market
Green line: 2013-2014 bubble top
Pink lines: nearer resistances, so potential short entries
Dashed black lines: nearer supports, so potential short covering/buying levels. They are more or less 38.2% and 50% retracements of the 2015-2017 bull market. They also are 50% and 61.8% retracements of march-september bull market