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This letter discusses the security considerations of cross-space collaborative perception based on Decentralized Autonomous Organizations (DAOs). It explores the inter-space collaborative perception in three spaces, namely the vehicles' configuration space, social society space, and cyberspace. A DAO-based cross-space collaborative perception system also enables data generation and interaction among these spaces. The letter addresses the security and privacy protection of the interaction data and the challenges of cross-regional cooperation caused by the privatization and centralization of data interaction protocols in the collaborative perception process. The letter analyzes the causes of these issues and explores a DAO-based cross-space collaborative perception system. By combining DAOs with the collaborative perception system, the safety, efficiency, and sustainability of intelligent vehicles can be …