Bitcoin measures the validity of a single state across a

multidimensional configuration space defined by:

- All available unspent outputs (the quantum field of UTXOs)

- All fee-weighted transaction paths (signed transactions waiting confirmation)

-All possible nonce permutations.

The measured state is the block, a coherent and permanent record of entropy resolution.

This is not abstract computation. The outcome could not have been known without performing the work. The system is non-predictive, non-reversible, and strictly conserved.

Bitcoin defines quantum computation.