Data transmission method and system based on block chain, electronic equipment and medium

The invention discloses a data transmission method and system based on a block chain, electronic equipment and a medium. Through application of the technical scheme of the invention, a newly added block chain network can be used for storing the hash root of the authorization data, so that the authorization data can be stored after the data use equipment receives the authorization data from the cloud server; whether the acquired data is tampered or not can be detected according to a mode of comparing the hash value obtained by calculating the authorization data with the hash root stored in the block chain network. Therefore, on one hand, the problem that there is no data authorization method with a high security degree to realize credible data transmission between the data provider and the data user in the prior art can be avoided. And on the other hand, the storage pressure of the block chain network can be reduced in a manner of performing authorization data verification by using the hash root. 本申请公开了一种基于区块链