Bitcoin dropped as much as 15% late Saturday, its biggest intraday drop since February, just days after hitting record highs.It's unclear what caused the sell-off. The plunge in the world’s most popular digital coin came after reports attributed the decline to speculation that the U.S. Treasury may take action against money laundering that’s carried out using digital assets, according to Bloomberg. The U.S. Treasury didn’t immediately respond to requests for comment from USA TODAY.Separately, a blackout in China’s Xinjiang region, which reportedly powers a lot of Bitcoin mining, was blamed for the sell-off, Reuters reported, citing data website CoinMarketCap.No joke:Dogecoin, the cryptocurrency created as a spoof, sees its market value top $40B