Author here.

A few quick clarifications up front: - No medical data is stored on-chain (hashes only) - This is a prototype to test assumptions, not a compliant system - Hospitals are not expected to run blockchain infrastructure - The design is intentionally chain-agnostic

If you think blockchain is unnecessary here, I’d genuinely like to hear what simpler alternative you’d recommend.

OP here. I’m still unsure about one assumption and would love pushback:

Even if the cryptography is solid, is asking doctors to scan a QR code already too much friction?

If you’ve built tools for clinicians, what’s the maximum workflow change they’ll tolerate?