Blockchain is fairly a new concept adopted by technology. It was launched in 2018. Blockchain is an unchangeable ledger used by the businesses worldwide for recording transactions, tracking assets and building trust. These records are unchangeable. If some error occurs and changes are necessary in the ledger, then new ledger has to be added. Ultimately both the ledgers are visible. Blockchain is basically a technology in which blocks containing data representing anything of value are chronologically connected in an immutable manner.
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