Monero Security Tested as Qubic Hits 58% Hashrate—and Passes

Qubic mining pool briefly controlled 52.72% of Monero’s (XMR) hashrate, peaking at 3.01 GH/s, raising fears of a 51% attack that could enable blockchain reorganization, transaction censorship, or double-spending. Despite crossing the critical threshold, Monero’s privacy-focused network showed resilience, with no malicious activity detected, affirming its robust RandomX algorithm designed to resist mining centralization.

Led by IOTA co-founder Sergey Ivancheglo, Qubic framed the surge as a planned “economic demonstration” from August 2 to 31, testing Monero’s security. Qubic’s strategy involved incentivizing miners with QUBIC tokens and converting Monero rewards into USDT for token buybacks, attracting miners and boosting its hashrate from 2% in May to over 50%. A DDoS attack temporarily dropped Qubic’s hashrate to 0.8 GH/s, but it recovered, mining 63 of 122 blocks in one window.

Monero’s community swiftly countered, reducing Qubic’s share to below 14% through miner redistribution to smaller pools like P2Pool. Developer Riccardo Spagni proposed “detective mining” to deter selfish mining without protocol changes, enhancing network defenses. Monero’s price dropped 10% to $251.35 amid the event, reflecting market jitters, but no funds were lost.

The incident underscores vulnerabilities in proof-of-work networks, prompting renewed debate on mining decentralization. Experts estimate sustaining such dominance costs $75 million daily, questioning its economic viability. Monero’s resilience highlights its community’s commitment to privacy and security, though calls for algorithm tweaks persist.