Abstract:

Objective To explore the application and prospect of blockchain-based digital identity in medical data management of cerebrovascular diseases. 

Methods Blockchain technology was used to decentralize cerebrovascular disease medical digital identities through the roles of issuer, controller, parser, prover and personal identity data account. A total of 200 subjects were selected to test the practicality and feasibility of the system based on the data exchange and medical imaging data. 

Results In the test of data exchange, for a single user, the average response time between saving and returning to save page of responsible directory was 1.261 seconds. For viewing the responsible directory, the average response time is 0.08 seconds. The average response time of submitting the data catalog and returning the page is 1.269 seconds. The system operated stably during the test, and can automatically resume services after network interruption and restoration. In the test of medical imaging data, the write flux was 9090 times per second, the average response time was 14.98 seconds, and an average of 9012 pieces of data are traversed per second. The reliability of the system was feasible, with the fault-tolerant capacity of 1/3 node. 

Conclusions Blockchain-based digital identity can ensure data security and promote data sharing and exchange, which has a promising prospect in the field of diagnosis, treatment and management of cerebrovascular diseases.

Key words: Blockchain; Digital identity; Cerebrovascular disease

摘要：

目的 脑血管病是我国主要的慢性非传染性疾病之一，其诊疗服务形成海量的医疗数据，数据的安全应用与管理是亟待解决的问题，基于区块链的数字身份技术具有去中心化、多方共识、公开透明、防篡改和可溯源等特征，给脑血管病的数据管理与应用提供了优化的工具。本研究旨在探索基于区块链数字身份在脑血管病医疗数据临床研究中的应用架构。 

方法 采用区块链技术，通过发行者、控制者、解析者、证明者和个人身份数据账户等角色，实现脑血管病医疗数字身份进行去中心化。研究选取了200个测试用户，对建立的模式进行基于数据交换和医疗影像数据的测试。 

结果 基于数据交换的测试中，对于单用户，职责目录的保存并返回保存页面平均响应时间为1.261 s，职责目录查看的平均响应时间为0.08 s，提交数据目录并返回页面的平均响应时间为1.269 s。基于区块链及数字身份的医疗影像数据交换系统在测试期间运行稳定，在网络中断再通后能自动恢复对外提供服务。基于医疗影像数据场景中，写入通量为9090次/秒，平均响应时间为14.98 s，平均每秒遍历9012条数据。可靠性检查结果较好，容错能力达到1/3节点。 

结论 基于区块链的数字身份能够保障数据安全、促进数据共享流通，在脑血管病的诊疗和管理领域有较好的应用前景。

关键词: 区块链; 数字身份; 脑血管病