This person runs livestreams and a website. On these the user says that he can double the amount of bitcoins you give to them. This user is also pretending to be SpaceX / Elon Musk. And the livestream are streams from NASA / SpaceX from more than 2 weeks ago.
Here is his website: http://elonmuskbtc.com/_x000D_
Here is his livestream: https://www.youtube.com/watch?v=Y6yPOOUDpvc