Abstract: A digital identity management method based on a blockchain-based technology is provided. In some exemplary embodiments, the method comprises: performing a first process for storing identity identification information of a subscription request in a first block of a blockchain in response to the subscription request from a service request device and then obtaining a block hash value of the first block as a result of performing the first process, performing a second process for storing the block hash value of the first block and data of authentication information of the subscription request in a second block of the blockchain and then obtaining a block hash value of the second block as a result of performing the second process, and inserting the block hash value of the second block into a digital identity data structure as a result of processing the subscription request.

Abstract: The present invention relates to a representative card linked with app cards, a payment system and a method thereof. The payment system comprises: a customer terminal which is connected to a card company server system through an app or web and is capable of replacing a main payment card with one selected among at least one or more app cards registered in the app or web in real time; a standard representative card which can be used online or offline as the representative of the app cards; an authorization network in which an authorization or purchase request is made based on the representative card; and a card company server system which performs an authorization or purchase process based on the main payment card of the registered app cards linked with the representative card.

Abstract: Provided is a blockchain-based electronic currency automatic charging method.

Abstract: A digital identity management method based on a blockchain-based technology is provided. In some exemplary embodiments, the method comprises: performing a first process for storing identity identification information of a subscription request in a first block of a blockchain in response to the subscription request from a service request device and then obtaining a block hash value of the first block as a result of performing the first process, performing a second process for storing the block hash value of the first block and data of authentication information of the subscription request in a second block of the blockchain and then obtaining a block hash value of the second block as a result of performing the second process, and inserting the block hash value of the second block into a digital identity data structure as a result of processing the subscription request.