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I understand sites like koinex/coinbase/etc.. credit bit coins when we try to buy bitcoins from them.

How do they (koinex/coinbase/etc..) get bitcoins to give it to users when they buy? are they doing mining and getting coins? or do they buy bitcoins from somebody who is mining ?

Senthilkumar Annadurai
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No, simply they sell and buy bitcoins. I sell them my bitcoins and you buy from them these bitcoins.

Adam
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