Citi Projects $1.​9T Stablecoin Market by 2030, Privacy Remains Key Barrier

**Privacy Boost is now live** on OP Mainnet and Soneium, marking a significant step toward institutional blockchain adoption. **Key developments:** - Privacy Boost deployed across two major chains - Toss preparing won-linked stablecoin trial for approximately 30 million users - First privacy solution on OP Stack that encrypts transfers while maintaining regulatory compliance - Institutions gain transaction privacy without sacrificing oversight requirements **Background context:** Toss, which handles financial transactions for two-thirds of South Korea, partnered with Optimism to test blockchain-based digital finance infrastructure. The three-month proof of concept will evaluate whether the OP Stack can support a won-backed stablecoin while meeting Korea's strict compliance, privacy, and control standards. Privacy Boost represents the first privacy offering built specifically for OP Stack chains, encrypting both transfers and contract logic while keeping all transactions auditable. The solution now supports pre-confirmations, enabling private transfers to complete within one second. This deployment demonstrates how tokenized finance can operate on chains with built-in confidentiality from launch, potentially setting a new standard for institutional blockchain adoption.

A new **ZK + TEE hybrid mechanism** has been developed that combines zero-knowledge proofs with trusted execution environments. **Key Performance Metrics:** - Proving time: **under 500 milliseconds** - Throughput: **1,800+ transactions per second** - Fast enough to handle real-world payment volumes **How It Works:** Zero-knowledge proofs validate each transaction's legitimacy without exposing the underlying transaction data, maintaining privacy while ensuring security. This hybrid approach represents a significant step toward making privacy-preserving blockchain technology viable for mainstream payment applications.

**Optimism partners with Toss to explore blockchain-based finance in South Korea** Toss, the financial super-app used by over 30 million South Koreans (two-thirds of the population), has signed an MOU with Optimism to test putting the Korean Won onchain. **Key details:** - Three-month proof of concept launching with Optimism, PrivacyBoost, and Toss - Testing a Won-backed stablecoin built on the OP Stack - Focus on meeting Korea's compliance, privacy, and control requirements - Toss handles banking, payments, investing, credit, and taxes for users The pilot will determine whether money can settle onchain while maintaining regulatory standards. If successful, this could establish the OP Stack as infrastructure for compliant digital finance at national scale. [Read the full announcement](https://optimism.io/blog/two-thirds-of-south-korea-runs-its-money-through-toss-now-toss-is-exploring-putting-the-won) | [Cointelegraph coverage](https://cointelegraph.com/news/south-korea-toss-partners-optimism-won-stablecoins)

**Four major regulated financial institutions have adopted the OP Stack across different markets within a year:** - **Europe**: Bitpanda's Vision Chain serves 7M users with 200ms blocks and OP Succinct ZK proofs for same-day L1 withdrawals - **US**: Kraken's Ink on OP Enterprise - **Japan**: Mitsui's Zipangcoin - **Korea**: Toss Bitpanda represents the first fully managed OP Enterprise partnership, building purpose-built infrastructure for institutional finance as a regulated European exchange.