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Due to the high transmission rate and high pathogenicity of the novel coronavirus (COVID‐19), there is an urgent need for the diagnosis and treatment of outbreaks around the world. In order to diagnose quickly and accurately, an auxiliary diagnosis method is proposed for COVID‐19 based on federated learning and blockchain, which can quickly and effectively enable collaborative model training among multiple medical institutions. It is beneficial to address data sharing difficulties and issues of privacy and security. This research mainly includes the following sectors: in order to address insufficient medical data and the data silos, this paper applies federated learning to COVID‐19’s medical diagnosis to achieve the transformation and refinement of big data values. With regard to third‐party dependence, blockchain technology is introduced to protect sensitive information and safeguard the data rights of medical …