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Bitcoin is a decentralized digital currency that you can buy, sell and exchange directly, without an intermediary like a bank. ... Each and every Bitcoin transaction that's ever been made exists on a public ledger accessible to everyone, making transactions hard to reverse and difficult to fake
If you want to earn bit coin
There are many platform that can earn bitcoin like read.cash, also there are many applications too.
By researching for how to earn bitcoin un Google you can gain a knowledge, also watch YouTube to learn more .