Is the whole blockchain kept on all miners' computers?

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• mempool

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Miners need to have whole blockchain in order to verify transactions. For example if someone send Bitcoin, miners should know that this account has this Bitcoin. Also you can look Bitcoin blockchain without download it, there are a lot of Bitcoin explorer, such as https://mempool.space/, https://blockstream.info/, https://blockchair.com/bitcoin, https://www.blockchain.com/explorer. These explorers provide data from blockchain.

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