An on-chain tally shows at least $5.57 billion left Binance-linked wallets across Ethereum, Bitcoin and Tron on Thursday in a suspected hack. Binance said the exchange is investigating a potential security issue but has not confirmed a hack or any impact on customer funds. Tether and Circle froze about $1.8 billion in stablecoins held at the main receiving address. A confirmed hack of this size would set a cryptocurrency theft record. Bitcoin dropped below $79,000, while BNB fell about 7%.