An Efficient Blockchain-based Auditing Scheme for EHR in Intelligent Healthcare System

Electronic health records (EHRs) are health records that are digitally stored and consist of data about a person’s wellness and increasing gradually. To store the EHR, a cloud service provider provides the storage for storing the EHR. By storing the data on the cloud, the integrity of data is a big concern for the EHR owner. Many Blockchain-based data integrity schemes are proposed for data integrity verification in which binary Merkle tree and quad Merkle tree are used, which increases the verification time for the EHR. To reduce the verification time in integrity auditing, the proposed scheme uses the ternary Merkle tree-based Blockchain for integrity auditing. The experiment and results show that verification time is reduced to 3 times lesser than the quad Merkle tree-based Blockchain and also reduces the execution time to 3.5 times lesser than the previous scheme. The security analysis shows that the proposed scheme is secured against some of the potential threats.