<p>Data has become a valuable resource that drives new business models and creates enormous business value. However, under the current data ownership model of Web 1.0 and Web 2.0, many data-driven applications arbitrarily collect and overuse user data for commercial purposes, resulting in increased incidents of data breaches and data misuse. In this paper, we present Data Interoperating Architecture (DIA) that decouples applications and user data to give back data ownership to end-users. DIA supports the novel data ownership model in the Web 3.0 era. We design Data Interoperating System (DIS), the core component in DIA, to support data interoperation among end-users, applications, and personal data stores. DIS consists of three modules: the blockchain platform helps protect data ownership, the identifier system makes data globally accessible, and the data discovery service makes data globally findable. Therefore, DIS solves the key issues of data interoperation: data identification, data discovery, and data ownership protection. DIS is a decentralized system co-governed by multiple stakeholders and provides services without collecting or accessing user data, thereby protecting data security and ownership. We develop a prototype of DIS and evaluate the system performance. Experimental results show that DIS is effective and efficient to support data interoperation when data is decoupled from applications.</p>