Method for Managing Modified Record of Data Which Can Reduce Size of Data Stored in Block Chain

摘要

The present invention relates to a data management method executed in an environment including a user terminal, a data management module, a smart contract module, and a block chain, the data management module comprising: a first step of receiving data from the user terminal; a second step of designating the previous data address as a null value and transmitting the data to the smart contract module together with the data if the data received by the data management module is new data; a third step of the smart contract module storing the data as a transaction in the block chain; and a fourth step in which the smart contract module transmits the transaction address of the data to the data management module and the data management module stores the transaction address.