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Monero

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Monero (XMR), the privacy-focused cryptocurrency, has just gone through its biggest blockchain shake-up yet. On September 14, network monitors reported an 18-block reorganization that wiped out 118 transactions. Independent analyst Xenu called it “the largest reorg in Monero’s history,” raising fresh questions about how secure and reliable the network really is.
A blockchain reorganization happens when miners can’t agree on which version of the ledger is correct. The network just goes with the longest chain and drops the shorter ones.&nbsp;
In Monero, miners had to choose between chains, so some transactions that looked confirmed ended up getting canceled. This can cause problems like double-spending, slow transactions, and confusion for anyone taking XMR.
<h2 class="wp-block-heading" id="qubic-s-mining-role">Qubic’s Mining Role</h2>
The episode has put the spotlight on Qubic, a rival blockchain project that controls a large portion of Monero’s mining power. Mining Pool Stats show Qubic controls 2.11 GH/s of Monero’s 6.00 GH/s hashrate, making it the largest single contributor. Earlier this year, critics accused Qubic of attempting a 51% attack on Monero.&nbsp;
Qubic founder Sergey Ivancheglo added to speculation with a <a href="https://x.com/c___f___b/status/1967138041727942936" target="_blank" rel="noopener noreferrer nofollow">post</a> on X, stating Monero “will stay because Qubic wanted it to stay.” Analysts interpret this as a demonstration of influence rather than financial gain.
Xenu, citing Monero developer Sech1, <a href="https://x.com/xenumonero/status/1967176964609060979" target="_blank" rel="noopener noreferrer nofollow">noted</a> that Qubic’s strategies, such as selfish mining, have caused inefficiencies, including a 43% orphan rate, reducing mining rewards.
<h2 class="wp-block-heading" id="expert-warnings">Expert Warnings</h2>
Security experts warn the threat remains. Co-Founder of SlowMist, <a href="https://x.com/evilcos/status/1967168465913196808" target="_blank" rel="noopener noreferrer nofollow">posted</a>, “If no one in the Monero community takes the issue of block reorganization seriously, then this Sword of Damocles will always hang over Monero’s head… It may not necessarily carry out a double-spend attack, but having this capability… It doesn’t even have to strictly exceed 51% of the hash power.”
Exchanges are responding cautiously. Kraken suspended XMR deposits and later raised required confirmations to 720, up from the usual 10, reflecting concerns about network trust.&nbsp;
The reorganization has already affected Monero’s market, contributing to past price drops of over 5% in 24 hours and more than 14% in a week during previous events. Analysts say repeated reorganizations could erode confidence in Monero if mining concentration is not addressed and stronger security measures are implemented.
<blockquote class="wp-block-quote is-layout-flow wp-block-quote-is-layout-flow">
 Also Read: <a href="https://www.cryptotimes.io/2025/09/10/linea-network-resume-block-production-after-a-46-min-halt/" target="_blank" rel="noopener noreferrer nofollow">Linea Network Resume Block Production After a 46-Min Halt</a>
</blockquote>

Monero Suffers 18-Block Reorganization, 118 Transactions Reversed

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