Brazil's Largest Crypto Exchange Mercado Bitcoin Confirms Cyberattack; Hypernative Estimates Over $40M in Suspected Losses @MercadoBitcoin, Brazil's largest cryptocurrency exchange, confirmed on November 2 that one of its systems had suffered a cyberattack. The exchange said the incident was quickly contained, customers would not incur losses, and no customer data had been leaked. Deposits and withdrawals have been temporarily suspended as a precaution. According to preliminary analysis by blockchain security firm Hypernative, more than $40 million in suspicious transfers were identified across at least 10 blockchains, including Bitcoin, Ethereum, Solana, and Tron. The estimated losses have not been confirmed by the exchange, and the attack method remains unknown.