A Secure Cross-chain Mechanism Based on Relay Chain and Smart Contract Encryption Scheme

With the widespread adoption of blockchain technology in various sectors, the problem of difficult value circulation and data transfer between blockchains is becoming more prominent, however, existing cross-chain methods have limited application scenarios and insufficient consideration for cross-chain data protection. To resolve these issues, this paper proposes a secure cross-chain mechanism based on relay chain and smart contract encryption scheme. The proxy nodes from each blockchain are elected to build a new relay chain as a data cross-chain medium. In order to ensure the honesty of proxy nodes, a proxy node selection method that integrates the VRF algorithm is designed. To address the issue of mistrust between blockchains and ensure the secure transmission of cross-chain data, a smart contract based encryption scheme is designed to make other blockchains and relay chains constrain each other. Finally, we evaluated the new mechanism in Ethereum, and experiments showed that the new mechanism is faster than the Wanchain project in processing cross-chain transactions and has stable performance.