Security Experts Flag Possible 51% Attack on Monero, Citing 6-Block Reorganization

Key Points

1. Slowmist security team reported a 51% attack on Monero (XMR) on Aug. 12, 2025, resulting in a six-block chain reorganization.

2. Qubic founder Sergey Ivancheglo claimed Qubic had seized control of Monero's computational power, though independent confirmations are pending.

3. Monero's price dropped over 5% in 24 hours and 14% for the week following the alleged attack.

4. Ledger CTO Charles Guillemet estimated the cost of sustaining the attack at $75 million per day, highlighting the threat to Monero's network.

5. SeraiDEX developer Luke Parker argued that the six-block reorganization does not necessarily confirm a successful 51% attack, suggesting it could be due to an adversary with high hash power getting lucky.