The expeditor names is Teri REVEL (RevelTeri@tiwas.fr) and the mail is in french. I searched his mail and name on internet but found no results. The message seems to be incomplete : it just start with the bitcoin address, and a short text saying that we have 48 hours to pay and that he have a tracker, and that not respecting the deal will lead to him sending the video recording to all our contacts. He also says that if we want a proof, we can respond Oui! to the message and he will send the video to six people. As the first part of the message seems to be absent, we dont know what video he is talking about and we dont even know how much money he wants. The message is simply titled hacker.