why did this coin double its value in the last 3 days?
Because all the people want to be on the Verge.
But there should be a reason why people want to be on the Verge..No crees?

The main reason is privacy. Verge offers blackhole tech in a simple and easy way to use.
Thanks Yolo, is Verge the only coin that uses blackhole tech and where can I read about blackhole tech?
Edit: I think Monero wants to implement it soon. Not sure if this coin is the only one using this tech