#SecureYourAssets Binance, the world’s biggest cryptocurrency exchange, confirmed on Friday that $570 million had been stolen in a hack of a blockchain it runs that serves as a bridge for asset transfers between networks. The attack on the Binance Smart Chain network highlighted weaknesses in decentralized finance, or DeFi, where transactions are controlled by code.

“Software code is never bug free,” Binance’s chief executive, Changpeng Zhao, said in an interview with CNBC. He emphasized that no users had lost money in the hack but said that so-called cross-chain bridges were particularly vulnerable to hacks and the industry needed to get better at learning from them.