The NASDAQ stock market is the second largest in the world, behind only the New York Stock Exchange - and it's clear they're eyeing cryptocurrency like never before. There's two fairly big developments on this front, all within a 24hr period.First off - the Winklevoss twins, owners of the Gemini exchange have officially brought NASDAQ on board to monitor their exchange for fraud. A press release from NASDAQ states:The second big development comes from NASDAQ's own CEO Adena Friedman speaking yesterday on CNBC's Squak Box, saying they're considering starting a cryptocurrency exchange of their own:Friedman continued...These developments are being viewed on Wall Street as cryptocurrencies biggest endorsement in recent times - and may also be viewed as a signal to traditional investors to get into the market now - before things truly explode.