Update (August 12, 2025, at 1:30 pm UTC): This article is updated to add a Qubic announcement.
The Layer-1 Blockchain Qubic said it “completed the attempt to dominate the Monero network,” claiming a monthly pushing ended Monday with 51% Monero’s hashrate control.
According to In a blog post on Monday, “Long, High-Stakes Technical Confrontation” ended with Qubic reaching 51% of Monero’s hashrate. Effort in conjunction with a six-block-deep chain reorganization discarded 60 previously valid blocks, According to On the dashboard of Monero Consensus status.
A six-block-depth repair is when the blockchain replaces the last six confirmed blocks with alternate chain longer or with higher combined work. While Qubic said showing that it had conducted a successful 51% attack on Monero, others were not convinced the claims.
Developers have argued the successful attacking attack
The claim has drawn immediate pushing from the developers who argued that the reorganization did not prove a successful 51% attack. Seraidex’s lead developer Luke Parker, said in an x Post That a six-block-deep re-repair network with an orphanage block “does not mean a ‘51% attack ‘has been successful.”
“It means an opponent with a high amount of hash has been lucky,” he added.
A 51% attack is when a single creature controls half of a mining power or blockchain stake, allowing it to rewrite transactions or hinder them. Zhong Chenming, co-founder of crypto cybersecurity firm Slowmist, was told on a Tuesday x Post That “this time the 51% attack on Monero seems to have succeeded.” He added:
“It’s also high cost, and it’s unclear what the economic benefits of doing this are finally … In theory, the quubic mining pool can now re-write the blockchain, achieve double spending, and censor of any transactions.”
Related: Research of coin metrics shows BTC and ETH is immune to 51% attack
How chain reorg opened
Quubic is a layer-1 blockchain that uses a “useful proof-of-work” model to route mining towards artificial intelligence activities, which recently rerouted its computing power to attack Monero (Xmr).
On a June 30th blog PostQubic announced that it started the Monero CPU mining mining through its own network. Mined XMR will be used to fund purchases and tokens burn for the quubic ecosystem. “Qubic miners are now performing real-world (Monero Mining) activities that make up the real market value, which has strengthened the Quubic economy,” the post stated.
Sergey Ivancheglo, founder of Crypto Projects Quubic, NXT and IOTA, admitted at the time his quubic network sets a taking of the Monero Network. To an x PostHe said that after controlling most of the network hashrate, the Qubic will reject blocks mined by other pools.
Related: 51% Ethereum attacks more difficult than Bitcoin – Justin Drake
The community of mono Reply to the attack on Quubic’s economy against Monero in late July. The community responded to continuous attacks with its own countermeasures, including a Enhanced distributing the decline-of-service attack against quubic mining. During the so-called six-hour DDOs attack, the hashrate of the mining pool fell from 2.6 gigahashes per second to 0.8 GH/s.
In the midst of the chaos, Monero’s price dropped nearly 8.6% to $ 248, according to CoinMarketCap.
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