US Patent 10417219 Data sharing method based on plurality of blockchains

Provided is a data sharing method based on a plurality of blockchains. The method includes registering, by a management server, user block data which includes user information and a hash key of each user of a plurality of users in a user information blockchain, receiving, by the management server, storage information of data provided by a first user from a storage server, and receiving, by the management server, a request for specific data from a second user and transmitting storage information of the specific data to the second user.