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immudb
immudb - immutable database based on zero trust, SQL/Key-Value/Document model, tamperproof, data change history
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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QR-Code-generator
High-quality QR Code generator library in Java, TypeScript/JavaScript, Python, Rust, C++, C.
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.
And as for the 800+ developers currently working on Bitcoin https://github.com/bitcoin/bitcoin/graphs/contributors
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.