**Abstract**

In the United States, longitudinal personal health record (LPHR) adoption rate has been low in the past two decades. Patients' privacy and security concern is a major roadblock. Patients like to control the privacy and security of their own LPHR distributed across multiple information systems at various facilities. However, little is known how a scalable and interoperable LPHR can be constructed with patientcontrolled security and privacy that both patients and providers trust. As an effort to increase LPHR adoption rate and improve the efficiency and quality of care, we propose a blockchain-enabled trusted LPHR (BET-LPHR) design in which security and privacy are protected while patients have full control of the access permissions. Two limitations associated with the proposed design are discussed. Options and practical resolutions are presented to stimulate future research.

**Keywords:** longitudinal personal health record, security, privacy, confidentiality, permissioned blockchain
