Abstract: A blockchain-based carbon dioxide emission reduction compensation system is provided that includes a carbon-neutral blockchain system and a Green Coin blockchain system. The carbon-neutral blockchain system receives from an information verifier server at least one of a carbon dioxide emission information message verified by the information verifier server, a carbon dioxide reduction information message verified by the information verifier server, and a carbon neutral cost information message verified by the information verifier server, and transmits a Green Coin reward request to a Green Coin blockchain system. The Green Coin blockchain system transmits a Green Coin reward message to the information verifier server in response to the Green Coin reward request. The availability of the blockchain-based carbon dioxide emission reduction compensation system can be improved and the occurrence of failures can be minimized.

Abstract: Disclosed herein is a user identity sharing system utilizing a distributed ledger technology security platform. The present invention includes an OFF-CHAIN configured to operate as a regional or national blockchain within a single jurisdiction, in which one or more virtual asset service providers and one or more identity management service providers are participating; and an ON-CHAIN configured to operate as a global blockchain with no borders, in which one or more virtual asset service providers are participating, wherein user identity information of the OFF-CHAIN are shared as de-identified identity information between a virtual asset service provider participating in both the OFF-CHAIN and the ON-CHAIN and another virtual asset service provider participating in the ON-CHAIN, thus preventing forgery of user identity information, and sharing user identity information between virtual asset service providers, other blockchains, distributed ledger technology platforms, and existing IT systems.