The Winklevoss Bitcoin Trust on Wednesday filed to sell 20.1 million shares on the Nasdaq exchange. The shares represent units of interest in the bitcoin exchange-traded fund launched by Tyler and Cameron Winklevoss, the twins who are best known for their legal dispute with Mark Zuckerberg over Facebook's origins. The ETF will be listed under the symbol COIN, according to the filing. The Winklevoss brothers also launched a bitcoin index - the Winkdex - in February. Bitcoin is a decentralized virtual currency that has attracted attention for its big price swings.
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