Medical Chain:联盟式医疗区块链系统

医疗数据共享、防篡改、防泄漏一直是困扰医疗行业的难题.一位患者在转诊时，往往无法提供以往的就诊信息，原因在于国内各医院医疗信息大多数情况下无法共享，而仅能通过病历、检验单等极易丢失的纸质信息来实现一部分医疗信息的共享.同时，患者的医疗信息极易造成泄露，在出现医疗纠纷时所提供的医疗信息也无法保证真实性与公正性.本文设计了一个基于实用拜占庭容错算法（Practical Byzantine fault tolerance，PBFT）的联盟式医疗区块链系统，该系统是一个多节点共同维护与共享的，并且能够防止医疗数据被篡改、泄露的医疗系统，可用来解决这些医疗难题.与现有医疗区块链系统相比，本系统具有一定的优越性与较好的适用性.

Medical Chain: Alliance Medical Blockchain System

Medical data sharing, anti-tampering, and anti-leakage have always been difficult problems in medical industry. When a patient is on referral, he or she often can not provide information on previous visits. The reason is that many hospitals in China can not share medical information in most cases, and they can only pass the easily lost paper information such as medical records and checklists to achieve part of the medical information sharing. On the other hand, the patient's medical information is easy to leak, and medical information provided in a medical dispute can not be guaranteed in terms of authenticity and impartiality. In this research, an alliance medical blockchain system based on the practical Byzantine fault tolerance algorithm (PBFT) is designed, which is a multi-node maintenance and sharing system, and is able to prevent medical data from being tampered with or leaked. This medical system can be used to solve the above medical problems. Compared with the existing medical blockchain systems, this system has some advantages and good applicability.