What is a 'finality reversion' attack in the context of PoS blockchains, and what condition makes it theoretically possible?
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A
An attacker reverses a finalized block by accumulating more than 1/3 of stake to prevent supermajority agreement on the next checkpoint
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B
An attacker uses quantum computing to reverse cryptographic signatures on finalized blocks
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C
An attacker bribes miners to orphan finalized blocks after the fact
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D
An attacker replays old transactions to roll back account balances