Blockchain is stored on all the computers running Bitcoin node . There are thousands of computers running full node. Each of these node record every new transaction in the blockchain. All of these nodes run as backup for the blockchain.
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Blockchain is decentralized and hence there is no central place for it to be stored. That’s why it is stored in computers or systems all across the network . These systems or computers are known as nodes. Each of the nodes has one copy of the blockchain or in other words, the transactions that are done on the network.
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