The regulators are starting to look at how they can regulate bitcoins.
The lowest it went was around US$400 before it quickly rebounded back in Feb 25.
With the rebound, I think that represent interests and a good base.
From the Ichimoku chart, we can see that $BTCUSD is forming a base around $630 range.
I believe, if it breaks through the kumo resistance and the immediate Tenkan sen around $647, it will go all the way to US$700.
$BTCUSD is volatile. As such, have your exit strategy in place.