Key Takeaways:
COTI has successfully implemented a solution to Yao’s 4-decade-old ‘Millionaires Problem’ on the Ethereum Sepolia testnet, using a cryptographic technique known as Garbled Circuits to enable private computation on a public blockchain. The demonstration, published May 7, marks the first practical solution to the foundational secure multiparty computation (MPC) challenge on Ethereum's public infrastructure.
"Vitalik Buterin publicly stated that Garbled Circuits are the path toward purely cryptographic security guarantees in multiparty computation," the COTI team said, referencing the Ethereum co-founder's previous talks on the subject. The achievement, developed in collaboration with Soda Labs, follows the solution's initial launch on COTI's own mainnet in March 2025.
The demonstration showed two parties entering private values to determine which was wealthier without revealing their actual net worth to each other or recording any plaintext data on-chain. The entire process operates over encrypted data using a gcEVM engine, which is compatible with the EVM and allows developers to write confidential smart contracts in Solidity using standard tools like Hardhat. This directly addresses a core challenge in blockchain design: how to execute verifiable computations on private data.
This breakthrough paves the way for COTI’s Privacy-on-Demand service, a layer that could bring confidentiality to DeFi execution, institutional data handling, and DAO governance votes across Ethereum and other EVM-compatible chains. By protecting execution parameters and individual inputs, the technology could unlock billions in value currently kept off-chain due to privacy constraints, impacting everything from private salary payments to confidential voting systems.
This article is for informational purposes only and does not constitute investment advice.
