Bitcoin is showing no signs of slowing down, blowing past $9,500 (about ¥1,054,500) less than a week after topping $8,000 and now quickly closing in on five big figures.

The price of the largest cryptocurrency by market value is soaring as it gains greater mainstream attention, despite warnings of a bubble in what not everyone agrees is an asset. From Wall Street executives to venture capitalists observers have been weighing in, with some more skeptical than others. Bitcoin has risen about 45 percent over the past two weeks.

By comparison, it took the S&P 500 Index since February 2014 to achieve a similar increase.