Blockchain-based Multiparty Computation System

Abstract

Data security and privacy preserving have gradually become key issues in the process of data cooperation. Most existing data multiparty computing solutions rely on trusted third parties, and the data owner loses control of the data, which may easily lead to privacy data leakage. This paper designed a multiparty computation system combined with blockchain and secure multiparty computation technology. This system uses the decentralization of the blockchain to remove dependence on third parties in existing data cooperation system, transfers secure multiparty computation protocol to off-chain execution, and on-chain smart contract is responsible for selecting agent computing nodes fairly and generating computation certificate. This system realizes the safe and fair joint computation of multiparty data without the data owner losing control of their original data.