The present invention relates to a method for providing an online ticket service by using a blockchain network, comprising steps of: (a) in response to acquiring ticket reservation information corresponding to a ticket purchased by a purchaser from a ticket sale server, creating a ticket token corresponding to the ticket by referring to the ticket reservation information, and registering generated information on the ticket token in a distributed ledger of a blockchain network; and (b) transmitting the ticket token to a seller token wallet corresponding to the seller of the ticket, thereby (i) causing the seller token wallet to transmit the ticket token to a user token wallet corresponding to the user of the ticket, and (ii) registering movement information of the ticket token from the seller token wallet to the user token wallet in the distributed ledger of the blockchain network.