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- Monero experienced an 18-block reorg invalidating 118 transactions.
- Qubic controls over 51% of Monero’s hashrate, raising security concerns.
- XMR price rebounded over 7%, showing resilience amid uncertainty.
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Monero (XMR) has defied ongoing network security worries, surging past $300 for the first time since 2021. The rally comes amid heightened attention on the privacy-focused cryptocurrency, following Qubic’s 51% attack and a record-breaking block reorganization that invalidated 118 transactions.
Nothing to see here. Qubic just pulled a casual 18 blocks reorg on Monero 🤷 pic.twitter.com/fwSFY3olNu
— zuqka ױ (@AvdiuSazan) September 14, 2025
What Happened: The Monero Block Reorg
On September 14, Monero experienced its longest-ever block reorganization, or “reorg,” spanning 18 blocks. A block reorg occurs when multiple miners simultaneously discover valid blocks, temporarily splitting the network. Usually, these reorgs are short-lived, but the recent event, likely linked to Qubic’s significant share of Monero’s hashrate, caused major concern.
Rucknium, a blockchain researcher, confirmed that 118 transactions were invalidated during the reorg. “Re-orgs in excess of 9 blocks are unacceptable,” they noted, highlighting the potential risk posed by concentrated mining power.
Understanding Qubic’s 51% Attack
Qubic, a Monero mining pool, revealed in August that it had achieved more than 51% of the network’s hashing power. Such control allows a miner to potentially double-spend coins or censor transactions, raising serious questions about network security.
While Qubic has framed its actions as a stress test rather than a malicious attack, exchanges like Kraken have responded cautiously. Kraken temporarily halted XMR deposits and withdrawals multiple times, citing the risks associated with the concentrated hashrate.
Why XMR Is Rallying
Despite these setbacks, Monero’s price jumped more than 7% following the reorg. Analysts suggest several reasons for the rebound. Some see it as a sign of confidence in the network’s ongoing security improvements. Others attribute it to market dynamics, including short squeezes from traders betting against XMR.
Also Read: Qubic Network Targets Dogecoin After Successful 51% Attack on Monero
The surge demonstrates that while security concerns remain, investor interest in Monero persists. Traders appear willing to look past temporary disruptions, focusing instead on the coin’s long-term value and its renewed spotlight in the crypto market.
Monero’s latest rally underscores the tension between network security risks and investor confidence. The crypto’s resilience amid a 51% attack warning and record block reorg highlights both the vulnerabilities and the strength of decentralized networks. As upgrades and security measures continue, XMR’s performance will remain a key indicator for privacy coin enthusiasts and risk-aware traders alike.
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Disclaimer: The information in this article is for general purposes only and does not constitute financial advice. The author’s views are personal and may not reflect the views of Chain Affairs. Before making any investment decisions, you should always conduct your own research. Chain Affairs is not responsible for any financial losses.
I’m a crypto enthusiast with a background in finance. I’m fascinated by the potential of crypto to disrupt traditional financial systems. I’m always on the lookout for new and innovative projects in the space. I believe that crypto has the potential to create a more equitable and inclusive financial system.
