Bitcoinhasenjoyedwideradoptionthananypreviouscrypto-currency;yetitssuccesshasalsoattractedtheattentionoffraudsterswhohavetakenad-vantageofoperationalinsecurityandtransactionirreversibility.WestudytheriskinvestorsfacefromBitcoinexchanges,whichconvertbetweenBitcoinsa