Blockchain technology has shown good promise for overcoming the limitations of traditional digital content platforms. However, the currently available blockchain-based digital content platforms still have certain shortcomings. It is necessary to further study the technical architecture and business operation model of such platforms. In this regard, this paper designs a framework for a digital content platform based on federated blockchain, which incorporates multiple participants of digital content operation into the platform system and provides an integrated solution for digital content operation and IPR governance; at the same time, the consortium blockchain forms a network with joint participation and management of multiple organizations, forming an endogenous competition mechanism and inhibiting monopoly of platform operators. In line with the designed platform architecture, the consensus reaching and certified institutional reputation adjustment mechanism of the platform is further designed based on the PoA consensus mechanism, coupling the consensus process with the institutional reputation adjustment process to promote institutions to better provide platform services. Based on the proposed platform architecture, the corresponding business operation mode is further discussed.