Cryptocurrency Knowledge Test

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An attacker gains control of 52% of the total hashing power on a Proof-of-Work (PoW) blockchain. Which of the following malicious actions can they now successfully execute?

Create new coins out of thin air. Steal cryptocurrency from another user's wallet without their private key. Reverse their own transactions after they appear confirmed, allowing them to double-spend coins. Change the fundamental consensus rules of the blockchain, such as the block reward amount.

Correct Answer:

Reverse their own transactions after they appear confirmed, allowing them to double-spend coins.

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