disallow VALID <-> INVALID equivocation
#493
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mkalinin
reviewed
Nov 22, 2023
mkalinin
reviewed
Dec 7, 2023
Co-authored-by: Mikhail Kalinin <noblesse.knight@gmail.com>
mkalinin
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Dec 7, 2023
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This essentially copies over https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.4/sync/optimistic.md#transitioning-from-valid---invalidated-or-invalidated---valid into more execution-layer specs.
The current specs don't use a verb much to describe the specific process of determination of
VALID, et cetera, but more the whole response construction. The one time I could find they unambiguously do, that verb is "classify", so went with that.The intent here is to disallow this equivocation even over time, i.e. for any given
newPayloador fcU, by construction it can't equivocate, and simply being incorrect indefinitely is not great either, but then that EL is just broken, in more significant ways.The harm/fallout/externality that's resulting from this is exactly that for basically ephemeral reasons, ELs are responding
INVALID, thenVALID, but by then from a CL perspective it can be too late.Phrasing it this way avoids reference to some ground truth state, requiring only relative comparisons and constraints.