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If a hacker wanted to alter a blockchain, what percentage of the block copies would he have to alter?

46. If a hacker wanted to alter a blockchain, what percentage of the block copies would he have to alter?

  1. Only his copy
  2. 1%
  3. 51%
  4. 100%

Answer: C) 51%

Explanation:

If a hacker intended to change a blockchain, he'd only be able to block 51% of block copies.

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