I couldn't complete one transaction with Kraken. I opened an account with Kraken on the advice of a friend and then funded the account w/a transfer from my bank. Even before I could complete my first transaction I was notified that my account was being closed, and that for "security purposes", they couldn't tell me why. It was strange. It's as if a cop pulls you over, writes you a ticket, but you're given no information as to what you did wrong. My money got tied up for a couple days but they eventually released it back to me.