51% Attack on Monero: Qubic Appears to Have Seized Control of the Network According to the, @evilcos, founder of SlowMist, the mining pool Qubic has gained control over the majority of Monero's hash rate, enabling a large-scale blockchain reorganization. This kind of control allows for rewriting the network’s history, launching double-spend attacks, and censoring transactions. Ledger’s CTO estimated that maintaining such an attack would cost around $75 million per day. Experts warn that this level of dominance poses a serious threat to the network's security.