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immudb
immudb - immutable database based on zero trust, SQL/Key-Value/Document model, tamperproof, data change history
https://github.com/codenotary/immudb can easily be utilized for immutable health records, the work would be locking it all up and providing an API for a search provider.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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And as for the 800+ developers currently working on Bitcoin https://github.com/bitcoin/bitcoin/graphs/contributors
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QR-Code-generator
High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.
https://en.cppreference.com/w/cpp/numeric/random + https://github.com/nayuki/QR-Code-generator/tree/master/cpp Generate QR code using random number. No need for power hungry blockchain.