Data comparison method and device based on blockchain, and medium

The invention discloses a data comparison method and device based on a block chain and a medium. The method comprises the steps of obtaining a data comparison application which at least comprises first to-be-compared data, an initiating user side public key and a receiving user side set, and sending the initiating user side public key to the receiving user side set; triggering to generate a data comparison operation rule based on the first to-be-compared data, and converting the first to-be-compared data by adopting the data comparison operation rule to obtain first conversion data; obtainingat least one response of the receiving user side to the data comparison application, wherein the response at least comprises second to-be-compared data and an initiating user side public key; obtaining a corresponding data comparison operation rule according to the initiating user side public key, and converting the second to-be-compared data by adopting the data comparison operation rule to obtain second conversion data;