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Bitcoin is that the world's first open-source cryptocurrency referred to as a decentralized digital currency. No financial organization or financial institution is required for transactions here and it's not a currency issued by the govt of any country. Bitcoin transactions are transacted directly from the sender to the recipient's computer online. These transactions are authenticated through cryptography and are publicly recorded in a ledger that is distributed to all. This open and distributed ledger is called blockchain.
Bitcoin is now very popular