Eh, models are the problem.

Bitcoin is not a model of physics, it is a measured instantiation of it. It embodies physical law by converting energy into time and memory through irreversible computation.

In doing so, Bitcoin resolves the graph isomorphism problem by becoming a measurable mathematical object: a finite structure where computation itself defines equivalence.

Rather than relying on abstract symmetry between graphs, Bitcoin manifests a one-to-one correspondence between energy expenditure and informational structure via measurable entropy, making isomorphism physically measurable through proof-of-work.