Also, Ethereum's notion of private mutable contract state seems misguided to me. A contract should have no state beyond the set of legitimate messages it received and sent as verifiable via Merkle proof on logs included (via hash) on the blockchain itself.
Verifiable computations (such as for cryptocurrency smart contracts) require a complete bit-precise deterministic semantic specification, which is logically isomorphic not just to computational reflection, but computational reflection with a canonical representation.
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