There is a surprising amount of upkeep that can be forgone if needed. Muscle, nail and hair growth, reproductive functions like menstruation or sperm production, reducing energy use in the brain (malnourished people often report brain fog). I've also read about slower healing and being more prone to infections, so there's probably some general system overhead that is cut.
Of course, this is no way to live long term, but in a starvation situation it makes sense to reduce energy demand to the absolute minimum
A lot of tiling WMs, for example i3, already support that. It can be useful when you want to hide a window like a long running terminal session, but I usually go to a new virtual desktop instead
If we're doing cryptography, then why go through the blockchain at all then? I could sell the original private key I used to sign the picture to somebody, and they can prove their ownership all day long. I don't see the value add of a fancy database.
Have you tried geometry nodes? It lets you use meshes from any object, allowing you to build up modifiers non linearly. I would say it covers 90% of the feature you're proposing.
Of course, this is no way to live long term, but in a starvation situation it makes sense to reduce energy demand to the absolute minimum