COTI has successfully implemented a solution to Yao’s 'Millionaires Problem' on Ethereum's Sepolia testnet using Garbled Circuits, marking a significant advancement in secure multiparty computation (MPC) without trusted intermediaries. This solution, developed in collaboration with Soda Labs, is now live on COTI's mainnet and compatible with the Ethereum Virtual Machine (EVM) and Solidity. The demonstration, published this week, showcases the first practical application of this foundational MPC challenge on Ethereum's public infrastructure. The problem, originally formulated by Andrew Yao in 1982, involves two parties determining who holds more wealth without revealing their actual values. COTI's implementation allows encrypted data computation, producing verifiable results without recording plaintext values on-chain, thus maintaining privacy. This deployment anticipates COTI's Privacy-on-Demand initiative, aiming to extend Garbled Circuits as a service layer to Ethereum and other blockchains. The initiative targets use cases such as DeFi protocol execution, institutional data handling, and decentralized governance voting systems. Ethereum co-founder Vitalik Buterin has recognized Garbled Circuits as a path to cryptographic security in MPC, highlighting their efficiency and practical value.