I am posting this under a throwaway account to keep both myself and my source confidential. My source was contacted by the US Commodity Futures Trading Commission (CFTC) in regards to his activities involving the popular bitcoin trading platform Bitfinex. Attached is the screen shot of the email with sensitive information redacted: http://imgur.com/STvv9k2 I have checked out the inquiring CFTC official and the CC on the email, both do appear to work at the Chicago office of the CFTC, one as a trial attorney and one as an investigator. I have not gone and inquired beyond an internet search so there might be more digging to check for legitimacy but this is as far as I am comfortable going.