WiretechnologyDextape brief
Mercado Bitcoin Halts Withdrawals After Security Incident as Hypernative Flags $40M Outflows
Tether has blacklisted two more of the attacker's addresses, on Ethereum and Tron, freezing the USDT sitting inside them.
Dextape brief
Mercado Bitcoin, a Brazilian exchange, paused deposits and withdrawals Monday after security firm Hypernative flagged over $40 million leaving linked wallets overnight. The exchange acknowledged the issue on X, saying it spotted and contained a breach in one internal system early that day, with no customer losses and no leaked personal data. Hypernative found the outflows spanned at least 10 blockchains, including Bitcoin, Ethereum, Solana and Tron. These transactions carried valid signatures, making them look authorized by the source wallets, and the method remains unclear. Tether froze USDT at two receiving addresses, while the Bitcoin address that took in about 106 BTC had not moved any of it by 14:50 UTC.
Why it matters: It shows apparently authorized transactions can move funds across many chains quickly, raising security questions for exchanges that hold customer assets.
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