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Which of the following is the most important reason why it is virtually impossible for one entity in a blockchain network to unilaterally alter a
Which of the following is the most important reason why it is virtually impossible for one entity in a blockchain network to unilaterally alter a document after it has been recorded and validated in a new block of transactions?
a. The use of a nonce to validate each block
b. The existence of multiple copies of the blockchain on many different computers
c. Digital signatures
d. Digital certificate
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