<p>Electronic Health Records (EHRs) represent an important constituent of modern healthcare, providing support for medical procedures, maintaining records about patient health for much extended time periods, and conducting analytical research in medicine. Despite the broad use of EHRs, the overwhelming demand exists for them to be shared among different health environments securely and in an interoperable manner due to restrictions imposed by these systems regarding privacy preservation, security, and auditability. The research outlines a patient-centred, blockchain-based architecture that guarantees patient data confidentiality and privacy when it is shared via EHRs. A consensus technique called Proof of Stake (PoS) is presented in order to solve the scalability problems of conventional proof-based consensus algorithms. By using this method along with smart contracts and cryptographic primitives, patient-focused access control policies can give patients full control over who owns their data and who can access it. The proposed framework was developed with the aim of making it easy and convenient for various stakeholders in the health care sector to communicate with each other, thus facilitating the exchange of data safely without the involvement of middlemen. Gas cost analysis, transaction latency analysis, and comparative analysis with the existing EHR management systems have been adopted as performance analysis. Through the adoption of the above approach with the aim of improving the data sharing process using EHR systems in the health care sector, the simulation outcome has ensured improved access governance, low computational cost, and secure medical data through the blockchain technology approach.</p>