bitcoindoubler.tech/ is a scam! i sent them $150 worth of bitcoin (.0333 bitcoin) and didnt receive anything. I contacted them many times and no response even though their contact page says they return messages within 12 hours! Hindsight yes i was stupid for sending them money and expecting to receive double, however I want to warn others. If they doubled my money every 10 hours i would be the richest man alive in 2-3 weeks. Stay away this is definitely a scam.