Monero, a number one cryptocurrency targeted on privateness, faces one of the severe safety challenges in its historical past.
Qubic, a mission led by IOTA co-founder Sergey Ivancheglo, says it presently manages greater than 51% of the community's hashrate. In blockchains secured by work proof algorithms, this is similar methodology utilized in Bitcoin, with that degree of management that permits attackers to rewrite transaction historical past, block transactions, and perform double assaults.
In a weblog publish, Quibic described the acquisition as an “experiment” that’s “a strategic and generally combating software of recreation principle.”
Builders, miners and safety specialists are actually debating whether or not decentralising networks is as strong as many imagine.
What’s a 51% assault?
Within the Proof of Work Blockchain, miners compete so as to add new transaction blocks to the chain. If one group controls greater than half of the entire computing energy, it may well overtake all different members.
That degree of management opens the door to a wide range of features that may undermine belief within the community. These embrace reorganization of chains, generally abbreviated as “Reorg.” This entails changing beforehand confirmed blocks with new ones. It additionally covers twice as a lot spending. This implies sending the identical token twice.
Maybe probably the most influential a part of the 51% assault is censoring transactions.
These assaults will not be theoretical. Ethereum Basic was a success a number of occasions in 2020, costing thousands and thousands. Bitcoin Gold confronted related incidents in 2018 and 2020. Small tokens like Verge are focused and develop into unstable.
Why is Monero nonetheless in danger?
Monero makes use of the RandomX algorithm to forestall mining utilizing application-specific built-in circuits (ASICs) and as a substitute promotes CPU mining. This design is meant to decentralize the community. That's why Qubic's fast rise is so necessary. It claims it has grown from under 2% of Monero's hashrate in Might to over 25% by late July, and now it has exceeded the 51% threshold.
Qubic runs a “Proof of Helpful Job” system that turns Monero Mining Rewards into USDT and makes use of these funds to buy and burn their very own Qubic tokens. The mechanism is anomalous, combining mining methods with token provide sinks. And it steadily elevated Qubic's management over Monero's hash energy.
Qubic reached a 51% share of Monero. This can be a nice feat. They would be the first to control cryptocurrency with a 51% assault. They intend to orphan all of the blocks from all the opposite miners, and can develop into Monero's solely mining affiliation. The one technique to mine Monero is…pic.twitter.com/riihj5ctpo
– Caffeinated Consumer | ꓘ &ױ (@caffeinateduser) August 11, 2025
“It’s estimated that it’s going to value $75 million per day to keep up this assault,” ledger CTO Charles Gillemet mentioned.
Bitmex Analysis added:
I did it. Monero's XMR is presently down 6% at $252 within the final 24 hours, exacerbating the 13.5% decline over the previous seven days.
What does this imply for Monero?
In a weblog publish, Qubic mentioned the acquisition shouldn’t be about defeating Monero, however about demonstrating that financial incentives and coordinated mining methods can successfully management bigger protocols over bigger protocols.
In line with Qubic, the experiment was to check whether or not mining assets may very well be beneficially diverted from the goal community to the financial loop of one other protocol.
At its peak, Qubic claims that its Monero Mining had a three-fold benefit over conventional Monero Mining. The restructuring of the community-approved reward system inspired funds to these efficient individuals and separated miners from different Monero swimming pools.
Qubic reaches over 51% of Monero's hashrate and successfully controls the community.
Qubic has but to begin an acquisition, and has confirmed a powerful principle by its actions.
Nevertheless, this story shouldn’t be over but. What might be subsequent for the way forward for Qubic and Pow Chains?
The next article pic.twitter.com/jqqnqpy95j
– Qubic (@_Qubic_) August 12, 2025
The preliminary push for Qubic's majority management was full of a sustained distributed dispersal rejection (DDOS) assault that destroyed peripheral providers for over every week, however didn’t abolish its core community.
These DDOS assaults continued on Tuesday, with Ivanchegro revealing that “Monero Maxis is returning favor” at X.
QUBIC claims it has stopped taking up the consensus to date, citing issues about its potential influence on XMR costs.
Are different blockchains weak to assaults?
Bitcoin hashrates are very excessive, making 51% of assaults prohibitively costly. Nevertheless, the proof coin of gradual work is extra weak. The price of acquiring a majority hash energy in Monero, Ethereum Basic or Bitcoin Gold is way decrease.
The privacy-focused coin faces extra challenges. Their censorship-resistant nature implies that when one social gathering controls the community this can be very privacy-injured, designed to guard it.