DECS: A Decentralized and Efficient Cross-Chain Scheme in IoT System

The rapid development of blockchain technology has demonstrated great potential to revolutionize various application domains, especially in the context of the Internet of Things (IoT). However, the sheer number and diversity of IoT devices pose significant challenges to the scalability and security of blockchain systems. To address these issues, cross-chain technology has emerged as a promising solution. Nevertheless, existing cross-chain solutions suffer from high centralization and inefficiency. Our approach involves constructing a multi-chain network capable of connecting different types of IoT devices, along with designing a collaborative cross-chain mechanism engaging multiple participating nodes. This collective participation diminishes the centralization inherent in the cross-chain process. Specifically, we propose a data verification method based on BLS signature. It aggregates cross-chain data signatures across multiple chains, which leads to a reduced storage burden on the blockchain. Furthermore, we introduce a reputation update algorithm that leverages network latency and cross-chain operation metrics to automatically update node reputation scores via smart contracts. Experimental results demonstrate that our solution achieves better decentralization and efficiency.