The value of cryptocurrencies skyrocketed in 2017 to more than $600 billion, minting scores of crypto millionaires.
A few lucky holders are also breathing the rarefied air of the billionaires club — and not just in the most valuable cryptocurrency Bitcoin, which has a market capitalization of $237 billion.
Two billionaires who now easily rank among the wealthiest Americans include the current and former CEOs of Ripple, a San Francisco-based company using blockchain technology in international financial transactions.
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