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That was my assumption considering that is exactly what we did do for our covid certificates. Ran on the same infra as passports which is gold standard.

Microsoft? YOLO with their crown jewels:

https://techcrunch.com/2023/07/17/microsoft-lost-keys-govern...

You can split any key into x/n pieces that require x outta n keys to approve a transaction.

All senior dev's, physical locations, board members, hell, even all stock holders, could cryptographically vote via an agreed upon method for any actions.

I've seen some documentaries implying that about some of the root keys for things like certificates, but you know that there are some laying around in easy to use format ...

Didn't Sony get hacked and had a nearly completed film leaked? I hope the others you listed have far better security.