--- title: Monero at Risk: Qubic Claims 51% Control, Threatening Network Integrity canonical: https://mining-provider.com/monero-at-risk-qubic-claims-51-control-threatening-network-integrity/ author: Mining Provider Editorial Staff published: 2025-11-20 updated: 2025-11-20 language: en category: News description: Monero faces a critical security threat as Qubic claims to control over 51% of its mining power, raising concerns about transaction integrity and market trust. This dominance could undermine Monero's privacy features and pose risks for other mid-sized Proof-of-Work cryptocurrencies. source: Provimedia GmbH --- # Monero at Risk: Qubic Claims 51% Control, Threatening Network Integrity > **Autor:** Mining Provider Editorial Staff | **Veröffentlicht:** 2025-11-20 **Zusammenfassung:** Monero faces a critical security threat as Qubic claims to control over 51% of its mining power, raising concerns about transaction integrity and market trust. This dominance could undermine Monero's privacy features and pose risks for other mid-sized Proof-of-Work cryptocurrencies. --- ## Monero Faces 51% Attack Risk as Qubic Claims Network Dominance Monero, the world's most recognized privacy-focused cryptocurrency, is currently facing a significant security crisis. This comes after Qubic, a project led by IOTA co-founder Sergey Ivancheglo, claims to control more than half of the network's mining power. Qubic has announced that it has surpassed the critical 51% hash rate threshold, which allows a dominant player to reorder blocks, reverse transactions, or selectively censor payments. The announcement has caused immediate turmoil in the markets, with XMR dropping 6% within 24 hours to $252, exacerbating a 13.5% decline over the past week. This situation raises serious concerns about the integrity and security of the Monero network. > "Although this is potentially lucrative, it threatens to destroy trust in the network almost overnight." - Charles Guillemet, Ledger CTO In Proof-of-Work systems like Monero, miners compete to add new blocks to the blockchain. If a single entity controls more than half of the network's computational power, it can outpace all competitors, enabling blockchain reorganizations, double spending, and transaction censorship. Such attacks are not hypothetical; for instance, Astraleum Classic was attacked multiple times in 2020, resulting in millions lost. Qubic's rapid rise is notable; it went from controlling less than 2% of Monero's hash rate in May to over 25% by the end of July, now claiming to have crossed the 51% mark. The project employs a "useful proof-of-work" model that incentivizes miners with above-average returns, reportedly making Monero mining through Qubic three times more profitable than traditional mining. Qubic's actions have sparked a backlash from Monero supporters, who have launched DDoS attacks on Qubic's peripheral services. However, the core systems of the project remain online, and Ivancheglo has indicated that these attacks are ongoing. Qubic has refrained from fully exercising its consensus control, citing concerns over the impact on XMR's price. Nevertheless, the mere possibility of such control raises fundamental questions about Monero's resilience. ## Implications for Other Blockchains The situation with Monero is particularly alarming due to its privacy features. However, this vulnerability extends to many mid-sized Proof-of-Work coins. The economic consequences of a sustained 51% attack are significantly less deterrent for these networks compared to Bitcoin, making them attractive targets for similar attacks. For Monero, the threat is not just about double spending or chain reorganizations; it involves the potential for a single entity to undermine the very censorship resistance and anonymity that underpin its value proposition. In summary, the emergence of Qubic as a dominant force in Monero mining poses serious risks to the network's integrity and could have far-reaching implications for the broader cryptocurrency landscape. > "If Qubic can maintain this dominance, it essentially means complete and permanent selfish mining - something that could revolutionize the market." - BitMEX Research Sources: - [Monero sieht sich einem 51%igen Angriffsrisiko ausgesetzt, während Qubic die Netzwerkdominanz beansprucht](https://bravenewcoin.com/de/Einblicke/Monero-ist-einem-51-fachen-Angriffsrisiko-ausgesetzt--da-Qubic-die-Netzwerkdominanz-beansprucht.) --- *Dieser Artikel wurde ursprünglich veröffentlicht auf [mining-provider.com](https://mining-provider.com/monero-at-risk-qubic-claims-51-control-threatening-network-integrity/)* *© 2026 Provimedia GmbH*