Monero Under 51% Attack — Qubic Pool Can Reorganize Chain and Double-Spend

I observed that SlowMist founder Cosine reported a seemingly successful 51% attack on Monero, indicating that the Qubic mining pool can now, at least in theory, rewrite the blockchain. According to this assessment, the pool could execute double spends and censor transactions, though the economic incentive for the attacker remains unclear because the operation is reportedly expensive.

Ledger's CTO Charles Guillemet also tweeted that Monero appears to be undergoing a successful 51% attack: Qubic has been accumulating hashpower for months and now controls the majority of the network's mining power. A significant chain reorganization was detected this morning, and with its current hash rate Qubic could rewrite blocks, perform double-spend attacks, and inspect or censor any transaction.

Estimates put the daily cost to sustain this attack as high as $75 million, making the long-term economic benefit uncertain. I recommend that related platforms stay alert to this threat and maintain close monitoring of the Monero network for further developments.