Monero Faces Setback After Qubic Mining Attack: Investor Confidence Shaken
Monero (XMR), widely regarded as the leading privacy coin, has recently experienced a significant decline in its price performance. While Monero had reached a yearly high of 419 US dollars during the ongoing bull market, its value has since dropped to 250 US dollars. This downturn has been exacerbated by a recent incident involving the Qubic project, which has unsettled many investors, according to Bitcoin-Kurier.
The Qubic project claimed to have temporarily controlled more than half of Monero’s network hash rate on August 11, 2025, orchestrating a reorganization (Reorg) of the blockchain. Qubic described this as a planned and pre-announced demonstration of its “Outsourced Computations” technology, part of an ongoing experiment to test its “Useful Proof of Work” approach under real-world conditions. The attack was executed in two phases: the first failed due to persistent DDoS countermeasures, while the second phase employed a Selfish Mining strategy. During a window of 122 blocks, the Qubic pool found 63 blocks, surpassing the targeted 51% threshold. Qubic stated that it deliberately refrained from a full takeover of Monero’s consensus to avoid negative price impacts, viewing the outcome as evidence that targeted economic incentives can lure miners from established networks into alternative structures.
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However, independent investigations, including those by BitMEX Research, suggest that Qubic may have exaggerated the incident. While Qubic did control a significant portion of the hash rate, BitMEX concluded that it was insufficient for a classic, sustained 51% attack. Instead, the event resulted in a short-term reorganization affecting only six blocks, which is relatively minor in the broader context. As a precaution, Monero holders and users are advised to wait for at least 20 confirmations before considering a transaction final, reducing the risk of reversal due to a subsequent reorg.
| Event | Details |
|---|---|
| Yearly High | 419 US dollars |
| Current Price | 250 US dollars |
| Qubic Block Share (122 blocks) | 63 blocks |
| Reorg Size | 6 blocks |
| Recommended Confirmations | 20 |
In Proof-of-Work blockchains like Monero, a reorganization (Reorg) can occur when an alternative chain with more cumulative work appears, causing nodes to switch to the longer chain. While a 51% attack requires majority hash rate control and allows for persistent manipulation, smaller reorgs can happen with less power and are typically short-lived. Selfish Mining, which involves withholding blocks to secretly build a longer chain, can be profitable with about one-third of the network’s hash rate but does not guarantee repeated or large-scale attacks.
“Qubic stated that it deliberately refrained from a full takeover of Monero’s consensus to avoid negative price impacts, viewing the outcome as evidence that targeted economic incentives can lure miners from established networks into alternative structures.” (Bitcoin-Kurier)
- Monero’s price dropped from a yearly high of 419 US dollars to 250 US dollars following the Qubic incident.
- Qubic’s mining attack led to a short-term reorg of 6 blocks, not a sustained 51% attack.
- Experts recommend waiting for 20 confirmations for Monero transactions to ensure security.
Summary Box:
Monero’s recent price decline and network instability were triggered by a Qubic mining attack, which, while significant, did not amount to a full 51% attack. The event highlights the importance of network security and the potential for economic incentives to disrupt established mining structures. Investors are advised to exercise caution and wait for sufficient transaction confirmations. (Source: Bitcoin-Kurier)
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