JMIR Review Finds Only One Real-World Blockchain Deployment Among 892 Studies

Distributed ledger technology and blockchain systems in digital health are functioning primarily as coordination and verification infrastructure rather than as primary repositories for patient data, according to a scoping review and evidence gap map published in the Journal of Medical Internet Research. Researchers mapping the field analyzed 892 peer-reviewed studies published between January 1, 2010, and February 28, 2026, finding that the literature is heavily dominated by early-stage technical proofs and simulations while operational deployments remain scarce.

Mapping 892 Studies Across Healthcare Sectors

The evidence base shows a heavy concentration in proof-of-concept and prototype work accounting for 418 studies, alongside 455 simulated or benchmarked evaluations. In contrast, only 18 studies reported pilot or usability-tested implementations, and just a single study detailed an operational or real-world deployment. Publication activity grew over the tracking period, with peak annual volumes recorded in 2022 and 2025. However, the Journal of Medical Internet Research reported that this surge in volume did not correspond to a shift toward higher-maturity evidence.

Application domains within the review clustered heavily around electronic health record management and health information exchange with 372 studies, followed by telemedicine, distributed care, and Internet of Things-enabled remote monitoring with 250 studies. Additional domains included clinical decision support and smart healthcare at 82 studies, public health surveillance and certification at 72 studies, clinical trials and research governance at 67 studies, and health data marketplaces or monetization at 49 studies. Across 3,273 nonmutually exclusive governance-function codes, the most frequent requirements addressed were privacy and security, interoperability and data sharing, access control, data and model integrity, and identity and authentication.

Evaluating Real-World Deployment Barriers

Higher-maturity evidence was unevenly distributed across the sector, appearing primarily within clinical trials and research governance alongside electronic health record management and health information exchange. Within the 19 higher-maturity studies identified in the review, evidence remained constrained by small-scale evaluations, short follow-up periods, and a lack of sustained routine use after the formal evaluation phase concluded. Privacy, security, and interoperability remained prominent across all publication years, while the emphasis on other governance functions fluctuated.

Digital health environments depend heavily on data exchange across distinct institutions, technologies, and regulatory jurisdictions. These complexities create persistent administrative hurdles for managing access permissions, user consent, system interoperability, data provenance, and institutional accountability. While distributed ledger technologies have been proposed to address these coordination challenges among distributed actors, whether these decentralized architectures actually improve governance outcomes over conventional databases remains largely untested outside of isolated test environments.

Prioritizing Comparative Implementation Research

Future research must move past isolated architecture papers to focus on comparative, implementation-driven evaluations. Investigators need to determine whether blockchain and distributed ledger systems can be successfully integrated, sustained over time, and proven to deliver concrete governance benefits in operational healthcare settings. The Journal of Medical Internet Research study establishes that while technical proposals continue to scale in academic literature, bridging the gap to routine clinical deployment requires rigorous testing beyond simulated testbeds.