Pease do not fall for this new scam betxloot.com, they might want to entice you with huge winnings, but a they want us your btc, don't give in.
The honest truth remains that if people don't get greedy it will be very difficult to scam them. It's only greed that makes people want to reap where they never sowed. Easily winning a bet as high as the OP stated with a stake of a mere $70 in less than 3mins should be a frightening promise. It should scare any sane mind and ring the bell that something is fishy somewhere.