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All Bitcoin transactions and public keys are recorded in a virtual ledger called the blockchain. A ledger is actually a chronological list of transactions. This ledger is replicated exactly on every computer connected to the Bitcoin network, and is constantly checked and secured using massive computing power around the world. The concept of blockchain has proven to be powerful and adaptable, and there are now a variety of non-cryptocurrency-related blockchains used for things like supply chain management. The “Bitcoin blockchain” specifically refers to the virtual ledger that records Bitcoin transactions and private keys.