Cross-Chain Identity Authentication for BIoMT with Multi-chain Fusion Mode

Blockchain-based Internet of medical things (BIoMT) changes the traditional centralized management form to distributed for the healthcare systems, which promotes the value of medical data. However, there brings a new “data island” problem with the emergence of more and more chains. This paper first introduces a multi-chain fusion (MCF) model to establish a secure cross-chain transaction mechanism to solve this new centralized problem. Then, a cross-chain identity authentication (CCIA) protocol has been proposed, which contains two parts of user identity anonymization and anonymous identity authentication. Here, the former part helps to achieve identity information hiding in different chains, and the second part utilizes identity filing to check its validity. Moreover, the security analysis shows that the CCIA protocol can protect the privacy system and user. The performance evaluation show that the MCF model is efficient and practical. Therefore, the MCF model and CCIA protocol can well support cross-chain transactions to maximize the value of medical data.