Bitcoin mining is the process of adding transaction records to Bitcoin's public ledger of past transactions or blockchain. This ledger of past transactions is called the block chain as it is a chain of blocks. The block chain serves to confirm transactions to the rest of the network as having taken place.
Bitcoin nodes use the block chain to distinguish legitimate Bitcoin transactions from attempts to re-spend coins that have already been spent elsewhere.
And the blockchain is a ledger of every block created since the very beginning of the network. But mining is not as simple as it sounds. Adding a new block to the blockchain is never easy. A bitcoin miner needs to show the proof of work in order to create a new block.
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