I mean to coins you sent to this “platform” before receiving the email. If I understand correctly, you wanted to off-ramp some BTC, so sent some to this unnamed platform that sent you this email, upon receiving the coins (I assume). My question is about what happens next? I you do not wish to answer their details request or if they don’t like the answer. Do they send back the “tainted” coins? Or keep them (while not sending you any cash)?