Techub News reports that Ledger's Chief Technology Officer Charles Guillemet tweeted, "Monero seems to be experiencing a successful 51% attack. This privacy-focused blockchain went live in 2014 and has long been a target for governments and three-letter agencies, and is currently banned by most major centralized exchanges. The Qubic mining pool has been accumulating hash power for months and now controls most of the hash power of the Monero network. This morning, a significant blockchain reorganization was detected. With its current dominance, Qubic can rewrite the blockchain, execute double-spending, and censor any transaction."