feat(flashblocks): add validation module for sequence ordering and reorg detection (1)#18993
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einar-oplabs merged 1 commit intodevelopfrom Feb 4, 2026
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #18993 +/- ##
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+ Coverage 76.3% 79.8% +3.4%
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Files 188 133 -55
Lines 10939 6909 -4030
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- Hits 8357 5519 -2838
+ Misses 2436 1390 -1046
+ Partials 146 0 -146
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…d reconciliation Add stateless validators for flashblock processing: - FlashblockSequenceValidator: validates consecutive indices within blocks - ReorgDetector: detects chain reorgs via transaction hash comparison - CanonicalBlockReconciler: determines strategy when canonical blocks arrive
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Summary
Adds stateless validation infrastructure for flashblock sequencing:
FlashblockSequenceValidator- Validates flashblock ordering (consecutive indices within a block, proper block transitions)ReorgDetector- Detects chain reorgs by comparing transaction hash sets between pending and canonical stateCanonicalBlockReconciler- Determines reconciliation strategy (CatchUp/HandleReorg/DepthLimitExceeded/Continue) when canonical blocks arriveDetails
All validation logic is stateless and
const fnwhere possible, with comprehensive test coverage for edge cases.Test plan
FlashblockSequenceValidator(NextInSequence, FirstOfNextBlock, Duplicate, NonSequentialGap, InvalidNewBlockIndex)ReorgDetector(identical sequences, different order, different counts, different hashes)CanonicalBlockReconciler(NoPendingState, CatchUp, HandleReorg, DepthLimitExceeded, Continue)