Hi.
I'm thinking of start selling bitcoins on localbitcoins for paypal and stuff, but I need to know which best way to double bitcoins is it cloud mining? investing or trading?
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thanks

I would recommend trading for you , cause investing is a risky thing and you dont have control of your money ,unlike trading where your money is safe and less risk. And also trading gives you easy profit as long as you know what altcoin to buy.