Kraken Temporarily Halts Monero Deposits After Monday’s 51% Attack

Crypto exchange Kraken has temporarily paused Monero (XMR) deposits due to the ongoing 51% attack against the privacy-focused blockchain, which has compromised the security of the network.

A 51% attack occurs when one mining pool controls more than 50% of a blockchain networkโ€™s total hashing power, giving it the ability to double-spend and reorder transactions on the ledger. The Kraken exchange wrote on Friday:

โ€œAs a security precaution, we have paused Monero deposits after detecting that a single mining pool has gained more than 50% of the networkโ€™s total hashing power. This concentration of mining power poses a potential risk to network integrity.โ€

Qubic, a layer-1 AI-focused blockchain and mining pool, claimed it controlled the majority of Moneroโ€™s hashrate on Monday and reorganized six blocks, prompting denials of the attack from the Monero community.

The Kraken exchange temporarily suspends XMR deposits. Source: Kraken

Monero is a major privacy-preserving protocol, and the 29th largest crypto by market capitalization, according to CoinMarketCap. The ongoing 51% attack on the network has sent shockwaves through the Monero community, triggering a wave of responses.

Related: Monero โ€˜economic attackโ€™ receives strong community response

Single mining pool assumes control of the network

โ€œAfter a month-long, high-stakes technical confrontation, Qubic reached 51% of Monero’s hashrate dominance, successfully reorganizing the blockchain,โ€ spokespeople for Qubic wrote on Tuesday.ย 

The mining pool was initially rebuffed in its attempt at a takeover, falling to the protocolโ€™s seventh-largest miner and was hit with an alleged denial of service attack on August 4.

A denial of service (DDoS) attack floods a computer, network, or server with fake incoming traffic, clogging the system and preventing real traffic from coming through.

Privacy, Monero, Cybersecurity
Qubic is now the number one Monero mining pool. Source: MiningPoolStats

The DDoS attack on Qubic sharply reduced the mining poolโ€™s hashrate from 2.6 gigahashes per second (GH/s) to just 0.8 GH/s, according to Sergey Ivancheglo, the individual who claimed responsibility for the 51% attack.

However, the Qubic pool recovered its hashing power, eventually controlling a majority of the computing power on the Monero network.ย 

โ€œThis event marks a pivotal moment in the crypto industry,โ€ Qubic spokespeople continued, while highlighting the takeover of a $6 billion privacy protocol by a $300 million AI protocol.

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