Tether Freezes Over $4.5M USDT Tied to Mercado Bitcoin Security Incident
Tether froze more than 4.5 million USDT linked to Mercado Bitcoin's November 2 security incident, while the Brazilian exchange suspended deposits and withdrawals during its investigation. Hypernative reportedly flagged more than $40 million in suspicious outflows, but neither side has established a final recoverable total.
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The Freeze and the Suspension
Tether froze more than 4.5 million USDT connected to Mercado Bitcoin's November 2 security incident, CEO Paolo Ardoino said while sharing the exchange's official statement. Ardoino's announcement described a freeze only and did not say the tokens had been returned to the exchange.
Mercado Bitcoin said it identified and contained a security incident affecting one of its systems early that morning, and that customers had suffered no harm and no data breach had occurred. It suspended deposits and withdrawals as a precautionary measure, and a later update said the company was still working to restore operations safely without announcing that transfers had reopened.
Conflicting Figures on Outflows
Brazilian outlet BitNoticias reported that security firm Hypernative flagged more than $40 million in suspicious transfers from wallets attributed to Mercado Bitcoin, moving into newly created addresses across at least 10 blockchain networks. That figure and Tether's 4.5 million USDT freeze measure different things: the first covers suspicious transfers across multiple assets and networks, while the second covers USDT blocked by its issuer. Neither source allocates the frozen amount to specific networks or reconciles the two totals.
Published Addresses and Tracking
Mercado Bitcoin published destination addresses tied to the incident across EVM-compatible networks, Bitcoin, Solana, Stellar and Tron, stating they were released solely for identification and tracking. The disclosure did not assign dollar values to each destination, and Ardoino's announcement did not allocate the frozen USDT among those addresses.
Background on Brazil's Monitoring Effort
Hypernative's alert follows earlier work with Brazil's central bank. Crypto.news reported in August that the central bank had built a real-time crypto threat monitoring and alert-sharing system with Hypernative, with Mercado Bitcoin and Foxbit named as planned participants. The system is designed to distribute warnings between banks and crypto firms when suspicious funds move, and testing had been completed before the incident.
Why It Matters
For Traders
Deposits and withdrawals at Mercado Bitcoin remain suspended, and the unresolved gap between the $40 million outflow estimate and the 4.5 million USDT freeze means final recoverable totals are still unknown.
For Investors
The incident tests Tether's freeze capability and Brazil's new cross-institution threat alert system, both of which bear on counterparty and custody risk in regional crypto markets.
For Builders
Published destination addresses across five network families give monitoring tools concrete references to track, and exchanges should note how quickly freeze requests and alert systems are being used.
This article is for information only and is not financial advice. Read the full disclaimer.
