At eight o'clock in the evening, on the 48th floor of the "World Financial Center" in Lujiazui, Shanghai, the office area of Lianwei Technology was still brightly lit. Chang Mengmeng leaned on the office chair and rubbed his swollen temples. The dense "smart contract code" on the computer screen was still flashing - this is the core demonstration case of tomorrow's "2024 Global Blockchain Security Summit". It comes from the "Cross-chain Bridge Audit Project" of a leading cryptocurrency exchange, involving more than 5 billion US dollars in funds.