Essentially, a reorg happens when a competing branch with more cumulative proof-of-work (PoW) overtakes the current one, kicking “orphaned” blocks to the curb and forcing unique transactions back into the queue. With ~2-minute blocks, 18 in a row is no paper cut—it’s a gash to recent finality.
The episode was first flagged by independent monitors on X and community dashboards, with analysts calling it the largest reorg in Monero’s history. Eighteen consecutive blocks, heights 3,499,659 through 3,499,676, were replaced, and 118 transactions were reversed pending re-mining.
Reports also showed an elevated orphan rate around the event, hinting at instability. Merchants and services urged patience, lifting confirmation thresholds from the customary 10 to 20–30 blocks while the dust settles and tooling catches up. Some confirmation thresholds are a lot larger.
Suspicion centered on selfish-mining tactics tied to Qubic, a rival project whose hashpower has loomed over Monero since August. Qubic figures have framed their antics as a “demonstration,” while outside researchers warned that concentrated hashpower can strong-arm short-term finality even without 51%.
Developers and contributors weighed mitigations from propagation tweaks to temporary rolling checkpoints, alongside renewed calls to broaden and decentralize mining even further. Community voices encouraged users to route hash to smaller pools to dilute outsized operators.
Market reaction was paradoxical: XMR changed hands near high $280s after the flap, helped by risk appetite, even as operational risk reentered the chat. No confirmed double-spend losses were cited by press time, but prudence, not bravado, remains the house style.
The takeaway: privacy didn’t break, but finality blinked a great deal. Until fixes land, treat low-confirmation Monero like a hot skillet—handle with care, wait the extra blocks, and watch the explorers for calm seas before stepping in.
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