The invention discloses a block chain-based medical
data management method,
system and device, and a medium, and relates to the field of
information management. The method comprises the following steps: acquiring medical data, analyzing content attributes and context information of the medical data through a first
smart contract on a block chain, and generating a first sensitivity level identifier; based on the first sensitivity level identifier, performing differential
encryption on the medical data through a second
smart contract on the block chain, and generating
verification information; partitioning the differentially encrypted medical data, constructing a
data structure together with the
verification information, and storing the
data structure into a block chain; in response to the received access request, verifying an authority
certificate in the access request and the type of the access request through a third
smart contract on the block chain, and generating an access
authorization certificate; and outputting target medical data corresponding to the access request based on the access
authorization certificate. By implementing the technical scheme provided by the invention, the full-life-cycle safety management and control of the medical data from collection, storage to sharing is realized.