Winklevoss twins: Bitcoin plunge a buying opp

About that big price drop: Well, Tyler Winklevoss said there's no reason to fear.

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"In the last few weeks the price has been kind of low. I view that as a buying opportunity. We have never sold bitcoin," he said. "For people who love volatility, or like to trade between different markets and stuff, there's plenty there. But we're more taking a long-term view."

The twins have a vested interest in the digital currency's future: They await regulatory approval of a bitcoin-based exchange-traded fund and recently announced the launch of Gemini.com, which will establish a centralized trading platform.

Read MoreBitcoin gets first regulated US exchange

The site would pair with Winkdex.com, which aggregates prices from various bitcoin exchanges currently operating.

"This is our effort to bring bitcoin mainstream, to build it into a regulatory box," Cameron Winklevoss said. "When we think of Gemini.com, it will be like a Nasdaq for bitcoin."

The currency's biggest obstacle has been overcoming a multitude for bad headlines, from the collapse last year of Mt.Gox, which to that point had been the most well-known trading center, to another issue of bitcoin digital wallets being compromised at Bitstamp.

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Tyler pointed out the difference between those two episodes in particular: Investors lost money when Mt.Gox collapsed, but Bitstamp customers were made whole.

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Winklevoss twins: Bitcoin plunge a buying opp