Anybody familiar with this website?
I really want to work with them but I can't seem to find any review about it online?
It seems legit.. but is it legit?
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Any website or service that promises to 'double your coins' is almost certainly a scam. Do not send them any bitcoin, or any other form of money.
Think about it this way:
The answer to this should be obvious: there is no 'foolproof way to double bitcoins'. Anyone claiming to have one is just trying to scam you.