What is a ledger? Is Blockchain an incorruptible ledger?

• A ledger is the main book or computer file for recording and adding economic transactions by account type, measured in terms of a monetary unit of account, with debits and credits in separate columns and a beginning and ending monetary balance for each account.
• Don and Alex Tapscott, authors of Blockchain Revolution, define blockchain as an incorruptible digital database of economic transactions that can be designed to record not only financial transactions but almost anything of value.
• Blockchain is said to be uncorruptible. Any ill-intentioned person acting alone has no authority. 'An attacker would need to control more than half of the network's entire computer power to seize control,' Augier argues. 'They hope that's just a hypothetical situation, but we can't be certain.' If this occurs, the person will take every measure to avoid being discovered.' Not to mention the energy consumed by the machines required to run the blockchain system.

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