South Korean fintech giant Toss is developing a proprietary layer-1 blockchain mainnet and native cryptocurrency to integrate across its payment, banking, and securities ecosystem serving 30 million users. The company filed trademarks for 24 Korean won stablecoin names including 'TOSSKRW' in June 2025 and has been recruiting blockchain engineers since February 2026. Toss is building an integrated Web3 wallet directly into its existing app, supporting virtual asset storage, transfers, payments, and tokenized securities management. With a Stablecoin Task Force led by Chief Business Officer Kyuha Kim, the company is preparing for South Korea's pending Digital Asset Basic Law. Toss reported its first profitable year in 2024 with $1.4 billion revenue and is targeting a U.S. IPO in 2026 at over $10 billion valuation.