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Public blockchains can alter the blockchain ledger by:

Public blockchains can alter the blockchain ledger by:
A . Creating a hard fork of the blockchain data, tooling and/or software
B . Achieving community consensus via a Smart Contract to update the ledger
C . Re-hashing the blocks from the total block height down to the genesis block
D . Blockchain ledgers are immutable and can never be altered

Answer: C

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