Looking at the chart since the peak in Dec 17, there is high volume around the last dip low, suggesting that it was the bottom for the downtrend.

There are also some large green bars over the last few days which shows some of 'whales' purchases. The blue line on the volume is a 20 day moving average and it is at the highest point since the peak. It appears that Feb 6th may have been the low for 2018. (As mentioned before)