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.

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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: Buy bitcoin dip