South Korean financial super-app Toss has entered into a strategic agreement with Optimism and Sunnyside Labs to test blockchain infrastructure for South Korean won-linked stablecoins through a three-month technology verification program. According to a press release shared with crypto.news, the financial technology company will work with Ethereum layer 2 network Optimism and privacy technology developer Sunnyside Labs to examine whether blockchain infrastructure can support institutional payment systems while meeting financial regulations in South Korea. This partnership represents part of the broader infrastructure development happening across the crypto market, as reported by multiple sources highlighting how large players are building places to hold, lend, trade and settle digital assets.
The companies will conduct a proof-of-concept (PoC) over the next three months to evaluate three critical areas: whether financial institutions can directly manage payment and settlement processes, comply with customer identification and anti-money laundering requirements, and protect sensitive transaction information while operating on a public blockchain. Optimism will provide blockchain infrastructure through its OP Stack technology, while Sunnyside Labs, one of the network's core developers, will integrate its Privacy Boost solution to address confidentiality concerns. As reported by crypto.news, Privacy Boost is designed to solve key limitations of public blockchains where transaction details and wallet balances are generally visible to network participants.
The system is built to support high transaction volumes, making it suitable for payment services that process large numbers of users simultaneously. According to Toss, the companies will examine whether OP Stack can support a blockchain-based financial network tailored for Korean digital payment services instead of relying on shared public infrastructure. Optimism's technology is already used by more than 30 blockchain networks, including projects developed by Sony, World Chain, Uniswap, OKX Layer, and Kraken. The company also offers institutional deployments designed to satisfy regulatory and security requirements, with regulated financial firms such as Europe's Bitpanda already adopting the technology.
Toss, which serves around 30 million users and supports more than 500,000 online and offline merchants, plans to gradually expand blockchain-based experiments across its payment and platform services. As reported by crypto.news, a Toss official stated that the project is intended to verify infrastructure that combines Ethereum's security with a dedicated network built for local currency-based financial services while allowing interoperability with other blockchain ecosystems. The partnership aligns with broader infrastructure development trends where exchange balances are shrinking and custody moves are expanding, suggesting institutional players are building foundational systems for digital asset management.
The collaboration comes as part of a broader wave of crypto infrastructure development, with Base recently activating the B20 token standard for stablecoins and tokenised assets. According to market analysis, these moves represent the market's adult phase where custody, tokenisation and payments decide whether crypto becomes infrastructure or remains mainly a casino with better branding. The crypto market is entering a period where 40% of altcoins are sitting near all-time lows while Bitcoin dominance stays elevated, creating a harsh backdrop for smaller tokens. However, institutions continue building balance-sheet positions, with Bitmine reportedly adding another $70 million of ETH and VanEck arguing that Strategy's $135 million Bitcoin sale didn't wreck its broader accumulation plan.
