Crypto exchange Coinsbuy lost more than $8 million in a coordinated attack across TRON and Ethereum on Aug. 9, according to onchain data reviewed by blockchain security researchers.

The attacker began with a 5 USDT transaction before draining eight TRON wallets of 6.04 million of the dollar-pegged stablecoin in about an hour. On Ethereum, three wallets were simultaneously emptied of 1.89 million USDT and 77 ETH, which was swapped to ETH via 1inch through a wallet created the same day.

Onchain records show the two chains were linked through cross-chain swapper Bridgers, whose Ethereum payout contract sent funds directly into the Ethereum swap wallet, connecting what appeared to be separate operations into a single incident.

The attacker…