⚠️ Today is also a historic moment, as Monero faces a significant risk — Qubic briefly controlled 52.72% of Monero's hash rate, theoretically enabling a double-spend attack. A double-spend attack means that the same amount of money can be spent twice. Let me briefly explain the logic and principles — 1⃣ The attacker sends one coin to their own account, using a forked new chain to record this transaction; 2⃣ Then, they send the same coin to an exchange, waiting for the public blockchain (the original blockchain) to record the transaction. Once the exchange confirms this transaction, the attacker quickly sells the coin, withdraws the funds, and leaves. 3⃣ The attacker has a publicly forked new chain, and since they control 51% of the hash power, the new chain is longer than the public blockchain, forcing the entire network to recognize the new chain, rendering the original public blockchain invalid. This means that the transaction recognized by the entire network is that the attacker sent the coin to themselves, rather than the transaction sent to the exchange; However, at this point, the Bitcoin at the exchange has already been withdrawn, but the attacker's coins have not decreased at all, as they have already been confirmed on the new chain. So, if you control 51% of the hash power, you can do whatever you want, and the entire blockchain loses its trust. Although Qubic claims there was no malicious intent and it was just a test, who can say for sure in this dark forest! This serves as a serious warning to all POW systems! You can check out a previously released "Qubic Threat Analysis Report on Monero's Hash Power," which goes into detail: