XMR News: Inside Qubic’s Controversial 51% Takeover of the Monero Blockchain
Qubic mining pool gained over 51% of Monero's hashrate, enabling potential double-spend attacks and causing a 10% price drop, raising concerns about network security and decentralization.
- Qubic mining pool claims to have crossed 51% of Monero’s hashrate on Tuesday, August 12, raising concerns about network centralization.
- On Tuesday, August 12, Qubic claims to have obtained more than 51% of Qubic’s network hashrate, after growing from less than 2% in May.
- Qubic claims to have crossed 51%, Ledger CTO Charles Guillemet, according to claims, estimated the attack costs about $75 million per day, and SlowMist confirmed a six-block reorganization.
- Shortly after Qubic claims to have crossed 51%, community-led miner boycotts cut Qubic’s share from over 51% to below 14%, and Monero’s price fell 10% to $251.35.
- Calls are growing for protocol changes to disperse mining power, as analysts warn low miner rewards may enable future 51% attacks.
17 Articles
17 Articles
Qubic Claims Successful 51% Monero Network Takeover
Qubic, a project led by former IOTA co-founder Sergey Ivancheglo, claims to have achieved majority control of Monero’s hashrate, reaching 51% dominance after “a month-long, high-stakes technical confrontation.” This level of control theoretically allows Qubic to reorganize blocks, censor transactions, and attempt double-spends on Monero’s privacy-focused token XMR. The project deployed a “useful proof-of-work” model that converted XMR mining rew…
Monero Sees Hiccups as Qubic Likely Succeds in 51% Attack | The New York Ledger
The privacy-focused cryptocurrency Monero has actually suffered a significant disturbance, with 60 mined blocks disposed of from its blockchain in the previous 24 hr in the middle of a continuous attempted 51% attack by the Qubic network. The Monero Agreement Status control panel reveals Monero saw 60 orphaned blocks (legitimate blocks that were turned down) in the last 720 blocks. The disturbance comes in the middle of a continuous financial at…
Cointelegraph
Monero network turmoil as Qubic claims hashrate dominance
Qubic claims majority control of Monero’s hashrate, igniting debate on whether the ensuing six-block reorganization resulted from a true 51% attack.
Monero Blockchain At Risk Of Hostile Takeover? Rumors Of Complete Blockchain Rewrite Circulate
The cryptocurrency world has been shaken by claims from Qubic, a project led by IOTA co-founder Sergey Ivancheglo, that it has allegedly seized majority control of the Monero blockchain’s hashrate. According to the team, this milestone was reached on August 11, 2025, after a focused push that lasted several weeks. The development has opened up concerns over Monero’s network security and the vulnerability of mid-cap Proof-of-Work blockchains to i…
Qubic, a layer-1 blockchain project that pools mining resources, has been trying a 51% attack on Monero and says it succeeded, causing Monero's price to fall
Adrian Zmudzinski / Cointelegraph: Qubic, a layer-1 blockchain project that pools mining resources, has been trying a 51% attack on Monero and says it succeeded, causing Monero's price to fall — at 1:30 pm UTC): This article has been updated to add a Qubic announcement. Layer-1 blockchain Qubic said it has …
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