Brazil's Largest Exchange Mercado Bitcoin Halts Withdrawals After $40 Million Hack

Brazil's largest crypto exchange paused deposits and withdrawals after a security incident. Tether froze more than 4.5 million USDT tied to the attack.

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  1. Incident Response and Asset Security Mechanisms: Mercado Bitcoin responded to the incident by suspending operations to contain the breach and is currently coordinating with authorities. While the exchange has not confirmed the $40 million loss estimate provided by security firm Hypernative, it has publicly committed to covering all user losses.
  2. The Role of Stablecoin Issuers in Incident Mitigation: Tether utilized its centralized control over USDT to freeze over 4.5 million tokens linked to the illicit activity. This mechanism prevents attackers from moving stolen stablecoins to other venues, although a freeze does not automatically restore ownership of the funds to the exchange.

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