Double-Layer Blockchain-Based Decentralized Integrity Verification for Multi-chain Cross-Chain Data

With the development of blockchain technology, issues like storage, throughput, and latency emerge. Multi-chain solutions are devised to enable data sharing across blockchains, but in complex cross-chain scenarios, data integrity faces risks. Due to the decentralized nature of blockchain, centralized verification schemes are not feasible, making decentralized cross-chain data integrity verification a critical and challenging problem. In this paper, based on the ideas of “governing the chain by chain” and “double layer blockchain”, we propose a double-layer blockchain-based decentralized integrity verification scheme. We construct a supervision-chain by selecting representative nodes from multiple blockchains, which is responsible for cross-chain data integrity verification and recording results. Specifically, our scheme relies on two consensus phases: integrity consensus for verification and block consensus for result recording. We also integrate a reputation system and an election algorithm within the supervision-chain. Through security analysis and performance evaluation, we demonstrate the security and effectiveness of our proposed scheme.