Researchers are exploring the use of blockchain and the internet of medical things (IoMT) to create secure and interoperable electronic health records. Various studies are investigating the application of blockchain in healthcare, including its potential for privacy-preserving vaccine supply chain management, personalized healthcare, and telemedicine. The integration of blockchain with other technologies, such as zero knowledge proofs and fine-grained attribute-based encryption, is also being examined for enhanced security and efficiency in healthcare applications.