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Proof-of-work security is only as strong as the distribution of hash rate, and that premise is under pressure right now.
Ravencoin has dropped to a record low after mining pools commanding most of the network's computing power began building a competing chain, an exploit that puts existing transactions at risk of reversal through a reorganization spanning three days of confirmed history.
What the exploit means on-chain A three-day reorg is not a technical abstraction.
Any transaction confirmed during those blocks, from exchange deposits to on-chain transfers, could be overwritten if the competing chain accumulates more work than the honest one.
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