Bitcoin and cryptocurrencies have taken off this year with bitcoin now being held by Elon Musk’s Tesla and adopted as a national currency by El Salvador.

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The bitcoin price, after a sharp sell-off earlier this week, has recovered some of its losses—surging back toward $60,000 per bitcoin and helping the wider crypto market rally. The bitcoin price is up 200% since this time last year, propelling the combined crypto market capitalization to almost $3 trillion.

Now, Hillary Clinton, the former U.S. presidential hopeful and secretary of state under president Barack Obama, has warned the rise of bitcoin and cryptocurrencies could undermine the U.S. dollar’s reserve currency status.

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