An analyst said a crash in bitcoin could hurt the stock market. I guess if you borrowed money to buy bitcoins or bought on margin (if you can do that) or used your equity line to buy coins it could force you to sell stock for cash. But is there enough bitcoin owners out there to even affect the wider market if a bitcoin crash happens? Are bitcoins underlying some derivatives or something? I don’t see how one would directly impact the other unless it is just a function of fear and panic that spreads. Am I missing something?