Previous year bitcoin prices. Source: CoinDesk Bitcoin Price IndexSelling “shares” of bitcoin on the open NASDAQ market would provide investors improved access to bitcoin-based assets.New York City-based SecondMarket operates a bitcoin investment trust. However, that fund is currently restricted to accredited investors.The Winklevoss brothers, who had an early hand in the conception of Facebook, have been bullish advocates of bitcoin for some time. They indicated last year they expect BTC to hit $40,000 per coin in the future.Big backersThe Winklevosses revealed their bitcoin investment last year, reportedly owning 1% of all bitcoins in circulation. Based on the digital currency’s total market cap, that would mean the twins jointly own over $50m in BTC.The brothers have been publicly stumping for the positive virtues of the virtual currency industry. They have appeared on CNBC and testified earlier this year in front of the New York Department of Financial Services’ hearings on virtual currencies.The twins are also keynote speakers at Money2020 later this year, which is expected to attract thousands of financial industry attendees.The SEC has recently issued guidance that warned investors bitcoin:“Has the potential to give rise both to frauds and high-risk investment opportunities.”Nevertheless, the Winklevoss Bitcoin Trust continues to make filings with the US government’s regulatory body for securities, suggesting its listing on NASDAQ could very well occur at some point in the future.Winklevoss image via Huffington PostCameron WinklevossMath Based Asset ServicesnasdaqSecondMarketTyler WinklevossWinklevossWinklevoss Bitcoin TrustOriginal author: Daniel Cawrey