How to earn free bitcoin without any investment

Bitcoin is a digital currency. It is basically a computer file which is stored in a "digital wallet'' app on a smart phone or computer. People can send Bitcoin (or part of one) to your digital wallet, and you can send Bitcoins to other people. You can simply earn bitcoin by mining but it takes lot of time. The best way to earn Bitcoin now is by investing little amount of bitcoin and get double of it in less than 24 hours. And you can simply withdraw to your bank account any day and anytime.
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