Secure Cross-Chain Transaction for Medical Data Sharing in Blockchain-Based Internet of Medical Things

It is challenging to solve the phenomenon of "information and value island" caused by cross-chain operation in blockchain-based medical Internet of things; in this paper, a multi-link fusion model based on a relay chain is proposed. By constructing a relay alliance chain governed by multiple parties to manage the cross-chain network, the use of blockchain technology addresses issues related to data sharing and business collaboration between multiple institutional blockchain systems. The cross-chain system based on relay mode provides interactive services for heterogeneous blockchain systems. The security and stability of cross-chain transactions are guaranteed through cross-chain gateways and cross-chain interaction protocols. The basic types of cross-chain interaction are summarized, and the implementation process of cross-chain interaction based on intelligent contracts is formulated. Finally, multiple sets of experiments were conducted to verify the feasibility of the cross-chain the scheme and the performance indicators of the cross-chain system were evaluated. The cross-chain mechanism of blockchain based on a relay chain can provide secure and efficient cross-chain services; this approach is suitable for most current cross-chain scenarios.