[South Korean Fintech Company Toss Collaborates with Optimism and Sunnyside Labs to Explore KRW Stablecoin] According to The Block, South Korean fintech company Toss is collaborating with Optimism and Sunnyside Labs to explore a KRW-denominated stablecoin. Over the coming months, the three parties will conduct proof-of-concept testing to evaluate the application of OP Stack in compliant blockchain-based digital financial infrastructure.