A Gann arc is usually produced by starting with a key low or high and placing the first arc at the nearest key high or low respectively. But in the case of an asset like Bitcoin where extreme growth is still very much on the table, an interesting study is produced by drawing the first arc of Gann's Square from Bitstamp's all-time lows of $2.22 to 2013's rally top.
This produces the highest time frame view possible.
Like everything else in technical analysis, the higher time-frame a signal is the more relevant it is.
Watch to see how price behaves as it comes up against this current arc.
If 1) it it starts to fail, then expect a dump at least to 570 possibly down to 400-ish. Then when price finally breaks out of the arc start hunting longs.
If 2) price consolidates quickly at the arc boundary then breaks out, or simply ignores this arc and continues to rally, then consider this arc "skipped" and follow the strategy set out by my previous post (link below). Price will likely rally all the way to the next arc around 2000-ish area before correcting.(Zoom out and scroll up on this chart to see this area).
My personal opinion is scenario 1 is more likely. But as my dear friend and trading mentor, Brian from the therationalinvestor.co, says " Opinions are worthless. All you have is your set-up."
Follow a time-tested set-up.
Of course, as with all things Gann, squaring your chart is the key to this whole thing.
See link below on how to do it manually.