Toss, Korea’s dominant financial super-app, has completed a proof of concept with the state-run Korea Minting, Security Printing and ID Card Operating Corp. for a blockchain-based public payment infrastructure connecting digital currency with existing payment systems, the companies said Friday. The project follows a memorandum of understanding signed in April and examines whether blockchain-based digital currency can work with existing public payment infrastructure. Toss and Korea Minting, Security Printing and ID Card Operating Corp. built a separate test environment for local love gift certificates and implemented the full payment process, from charging gift certificate tokens with blockchain-based digital currency to payments and merchant settlements. The system uses Optimism, an ethereum layer 2 network, to process transactions while linking digital currency transfers with transactions handled by existing payment systems. The companies also tested Privacy Boost, a privacy solution designed to protect sensitive transaction information from exposure on a public blockchain during paym
