The blockchain is the heart of Bitcoin. Put simply, it is a public ledger that records every Bitcoin transaction since 2009 and that nobody can forge afterwards. A ledger that everyone owns At a bank, the bank keeps the ledger. You have to trust that it makes no mistakes and manipulates nothing. With Bitcoin there is no central ledger. Instead, thousands of computers around the world (the so-called nodes) hold a complete copy. Every node checks every new transaction itself according to fixed rules. Anyone who wants to cheat would have to convince the majority of these independent …
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