Just this month alone, bitcoin’s price has rallied more than 50%, fueled by U.S. regulators’ first approval of an exchange-traded fund (ETFs) linked to bitcoin futures contracts. The ProShares Bitcoin Strategy ETF started trading on Tuesday on the New York Stock Exchange and hauled in $570 million of assets on its first day, while garnering an astounding $1 billion in trading volume, in one of the most successful ETF launches of all time.