Riot Blockchain Inc. said it's buying a Florida futures brokerage firm in an effort to create a digital currency exchange and a futures brokerage operation.

The Castle Rock company (Nasdaq: RIOT) said it's buying Logical Brokerage Corp of Miami for an undisclosed price.

"We have identified a substantial market need for additional options to serve a growing customer desire to transact in digital currencies within the U.S. Logical Brokerage helps provide a platform from which to service this market," said John O'Rourke, chairman and CEO of Riot Blockchain, in a statement.

Riot Blockchain shares, to put it mildly, have been on a wild roller coaster ride since October, after the medical device company Bioptix changed its name to Riot Blockchain and said it would it focus on bitcoin and digital currency.

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