In what appears to be the largest DeFi hack in history, Poly Network, a cross-chain interoperability protocol, lost over $600 million of combined amounts in $ETH (Ethereum), $BSC (Binance Smart Chain), and $MATIC (Polygon) to a still unknown threat actor.The breach is considered to be the largest of its kind in the decentralized finance (DeFi) sector. The identified addresses contained the following amounts: $264.8 million in $ETH, $250.8 million worth of $BSC, and $85 million worth of $MATIC.