Important news from last night and this morning (November 30 - December 1)

Yearn Finance suffered a $9 million loss in a hacking attack, with the attackers still holding $6 million in crypto assets; HashKey passed the Hong Kong Stock Exchange hearing and plans to build a compliant digital asset ecosystem; BTC fell below $87,000, down 4.86% intraday; Telegram founder announced the official launch of the decentralized AI network Cocoon.