There's a new exchange traded fund tracking companies with exposure to the blockchain space, the sizzling hot technology behind bitcoin.

The Reality Shares Nasdaq NexGen Economy ETF (BLCN) features companies like IBM (IBM) , Nasdaq (NDAQ) , Overstock (OSTK) and Accenture (ACN) . 

Eric Ervin, CEO of Reality Shares, the firm behind the ETF, said the fund's name initially included "blockchain," but the SEC raised concerns, given the hype surrounding blockchain and bitcoin.

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