Sergio –
Victim Location 10001
Total money lost $126
Type of a scam Sweepstakes/Lottery/Prizes
It says on the website (https://doublerbtc.us) that they have a handfull of specialists and a computer server that can double your Bitcoins in 100 hours. You just have to give them your Bitcoins and your Bitcoin address. But it does not happen. They claim you did not made the transfer, even you confirming it with blockchain. So i understand that this is a scam.