There are very, very few actual "hitmen" because the scenario usually runs like this: Two fat wankers meet in jail. Fat wankers leave jail. One fat wanker thinks his wife has been cheating. Asks the other fat wanker to kill her. He does. Two fat wankers go back to jail. The end.
Until I see an actual new story where a hitman has been paid by bitcoin (and they must have recieved a fair few payments now) then imma call grade A bullshit.