Toss Explores Next-Generation Digital Finance Infrastructure with Optimism and Sunnyside Labs

• Three companies launch a proof of concept to evaluate blockchain infrastructure for future KRW-backed stablecoin applications
• Pilot to assess institutional controls, regulatory compliance, and privacy technologies for regulated digital finance

Toss has signed a memorandum of understanding (MOU) with Optimism and Sunnyside Labs to explore next-generation blockchain infrastructure for the Korean financial market. Over the next three months, the companies will conduct a proof of concept (PoC) to evaluate whether Optimism's OP Stack can support institutional digital finance use cases, including future applications for KRW-backed stablecoins.

The pilot will evaluate three capabilities critical to regulated financial services: whether financial institutions can maintain control over transaction ordering and settlement, whether KYC and AML requirements can be implemented at the infrastructure level, and whether sensitive transaction data can remain confidential while operating on a public blockchain. The companies will leverage the OP Stack together with Sunnyside Labs' Privacy Boost technology to assess whether these requirements can be met in a blockchain-based financial environment.

During the verification process, Optimism will handle the blockchain-based infrastructure, while the privacy technology, Privacy Boost, will be handled by Sunnyside Labs, Optimism's official core development studio. Developed by Sunnyside Labs for institutional use, Privacy Boost enables confidential transaction processing on public blockchains while preserving auditability for regulated financial institutions. The technology also supports high transaction throughput, making it suitable for large-scale financial services.

Optimism is one of the world's leading Ethereum Layer 2 ecosystems, with more than 30 chains built on the OP Stack, including Sony's Soneium, World Chain, Unichain, OKX's X Layer, and Kraken's Ink. The OP Stack combines Ethereum's security with high performance and low transaction costs, while enabling organizations to build dedicated blockchain infrastructure tailored to their operational and regulatory requirements.

Toss sees the collaboration as an important step toward validating blockchain infrastructure for the next generation of digital finance. Building on Ethereum's security and trust, the company aims to explore dedicated financial infrastructure optimized for the Korean market while maintaining interoperability with the broader blockchain ecosystem. With more than 30 million users and an omnichannel payments network spanning over 500,000 online and offline merchants, Toss plans to gradually expand its exploration of blockchain-powered financial infrastructure.

"Korea has one of the most sophisticated financial ecosystems in Asia, and Toss has already established exceptional compliance and security capabilities for regulated financial services," said Kyle Jenke, Chief Business Officer at Optimism. "This proof of concept will demonstrate that the OP Stack can meet the performance, privacy, and compliance standards required by financial institutions, and we're excited to work alongside one of the most trusted partners in the market."

"For Web3 technology to successfully integrate into institutional finance, strict regulatory compliance and robust privacy protection are essential," said Qha Steve Kim, Chief Business Officer at Toss. "By leveraging Optimism's proven OP Stack, we aim to evaluate the potential for building a highly trusted, compliance-ready digital financial infrastructure tailored to the Korean market."