Tether CEO Paolo Ardoino said in a post on X that the stablecoin issuer had frozen more than 4.5 million USDT linked to the Mercado Bitcoin security incident

From the articleBrazil's Largest Exchange Mercado Bitcoin Halts Withdrawals After $40 Million Hack - DecryptAlso in Tether freezes $4.5 million as Mercado Bitcoin hacker holds $46 million in crypto, Mercado Bitcoin, Brazil’s largest crypto exchange, hit by $46 million security breach