[REVISION HISTORY]

Security incidents at Brazilian cryptocurrency exchanges

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2026-11-04 11:23 UTC → 2026-11-04 15:08 UTC · added ~~removed~~

Brazilian cryptocurrency exchanges have faced significant security and operational challenges. In October, Brasil Bitcoin investigated allegations of a massive data breach after a cybercriminal claimed to possess the personal and transaction data of approximately 657,000 investors. The company stated that its technical team was verifying the leak and noted that no customer funds were accessed. In November, Mercado Bitcoin suspended all deposits and withdrawals following a security incident. While the exchange maintained that no customer funds were harmed and no data breach occurred, security firm Hypernative reported suspicious movements totaling approximately US$ 40 million across at least ten blockchains. On November 2, Mercado Bitcoin confirmed it had contained a breach within one of its systems. The exchange stated the impact reportedly affected the company’s own resources rather than user funds. Hypernative updated its assessment, reporting suspicious movements between US$ 40 million and US$ 45 million across at least ten blockchain networks, including Bitcoin, Ethereum, Solana, and others. Specific assets involved include approximately 106 BTC, 2,852 ETH, 10,700 SOL, 6.7 million XLM, and 77,000 AVAX. Security firms including CertiK and Hypernative noted that attackers appeared to use authorized signatures rather than a smart contract exploit, suggesting potentially compromised private keys. Tether and Circle have reportedly frozen approximately US$ 6.2 million in stolen funds. Mercado Bitcoin is reportedly working with authorities and partners, such as Chainalysis and Paxos, to track assets and has published destination wallet addresses to assist investigators. Recent updates indicate that collaborative recovery efforts involving Tether, Circle, Paxos, BRL1, and Chainalysis have helped immobilize assets totaling over US$ 9 million, with Tether specifically confirming it has frozen over US$ 4.5 million in USDT tied to the incident.

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