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FILE: An employee uses a smartphone as he demonstrates how to purchase bitcoins from a bitcoin automated teller machine (ATM) at the Coin Trader bitcoin retail store in Tokyo, Japan, on Wednesday, Aug. 30, 2017. Bitcoin is showing no signs of slowing down, 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. Our editors select the best archive images on Bitcoin. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

FILE: An employee uses a smartphone as he demonstrates how to purchase bitcoins from a bitcoin automated teller machine (ATM) at the Coin Trader bitcoin retail store in Tokyo, Japan, on Wednesday, Aug. 30, 2017. Bitcoin is showing no signs of slowing down, 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. Our editors select the best archive images on Bitcoin. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

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A member of Japanese pop group 'Virtual Currency Girls' performs onstage in Tokyo, Japan, on Friday, Feb. 16, 2018. The eight-member girl group held a concert for their fans and Coincheck owners. The cryptocurrency exchange Coincheck Inc. lost over $500 million due to a cyber heist last month. Photographer: Noriko Hayashi/Bloomberg via Getty Images

A member of Japanese pop group 'Virtual Currency Girls' performs onstage in Tokyo, Japan, on Friday, Feb. 16, 2018. The eight-member girl group held a concert for their fans and Coincheck owners. The cryptocurrency exchange Coincheck Inc. lost over $500 million due to a cyber heist last month. Photographer: Noriko Hayashi/Bloomberg via Getty Images

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The logos of China UnionPay Co.'s UnionPay card, top right, and Bitcoin, bottom, right, are seen at the information desk inside the Bic Camera Akiba electronics store, operated by Bic Camera Inc., in the Akihabara district of Tokyo, Japan, on Thursday, June 22, 2017. The store held its grand opening day on Thursday. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

The logos of China UnionPay Co.'s UnionPay card, top right,  and Bitcoin, bottom, right, are seen at the information desk inside the Bic Camera Akiba electronics store, operated by Bic Camera Inc., in the Akihabara district of Tokyo, Japan, on Thursday, June 22, 2017. The store held its grand opening day on Thursday. Photographer: Tomohiro Ohsumi/Bloomberg via Getty Images

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The building housing the headquarters of cryptocurrency exchange Coincheck Inc. stands in Tokyo, Japan, on Monday, Jan. 29, 2018. Japanese cryptocurrency exchange Coincheck said it will use its own capital to reimburse customers who lost money in Friday's $400 million theft. Photographer: Akio Kon/Bloomberg via Getty Images

The building housing the headquarters of cryptocurrency exchange Coincheck Inc. stands in Tokyo, Japan, on Monday, Jan. 29, 2018. Japanese cryptocurrency exchange Coincheck said it will use its own capital to reimburse customers who lost money in Friday's $400 million theft. Photographer: Akio Kon/Bloomberg via Getty Images

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An error page is displayed on cryptocurrency exchange Coincheck Inc.'s Bitcoin Wallet app in an arranged photograph in Kawasaki, Kanagawa Prefecture, Japan, on Monday, Jan. 29, 2018. Japanese cryptocurrency exchange Coincheck said it will use its own capital to reimburse customers who lost money in Friday's $400 million theft. Photographer: Akio Kon/Bloomberg via Getty Images

An error page is displayed on cryptocurrency exchange Coincheck Inc.'s Bitcoin Wallet app in an arranged photograph in Kawasaki, Kanagawa Prefecture, Japan, on Monday, Jan. 29, 2018. Japanese cryptocurrency exchange Coincheck said it will use its own capital to reimburse customers who lost money in Friday's $400 million theft. Photographer: Akio Kon/Bloomberg via Getty Images