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Monero’s 51% Attack Problem: Inside Qubic’s Controversial Network Takeover

2025-08-12 16:26:25

Main Idea

Qubic claims to have achieved 51% control of Monero's hashrate, raising concerns about network decentralization and potential 51% attack risks, though it describes the move as an experiment in game theory.

Key Points

1. Qubic, led by IOTA co-founder Sergey Ivancheglo, now controls over 51% of Monero's hashrate, posing a potential threat to the network's security and decentralization.

2. A 51% attack could allow Qubic to reorganize blocks, double-spend, or manipulate transactions, though Qubic claims this is an experiment in resource diversion and game theory.

3. Monero's XMR price dropped 6% in 24 hours and 13.5% over the past week following Qubic's announcement.

4. Qubic's 'useful proof-of-work' system converts Monero mining rewards into USDT to buy and burn its own QUBIC tokens, increasing its control over Monero's hashpower.

5. Smaller proof-of-work blockchains like Monero are more vulnerable to 51% attacks compared to larger networks like Bitcoin due to lower hashrate costs.

Description

Monero, the leading privacy-focused cryptocurrency, is facing one of the most serious security challenges in its history. Qubic, a project led by IOTA co-founder Sergey Ivancheglo, says it now controls more than 51% of the network’s hashrate . In blockchains secured by proof-of-work algorithms, that's the same method used by Bitcoin, that level of control can allow an attacker to rewrite transaction history, block transactions or carry out double-spend attacks. In a blog post , Quibic described ...

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