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Add section about re-orgs

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Paul Hauner 2021-12-14 16:42:35 +11:00
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sync/optimistic.md
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@ -57,6 +57,16 @@ unknown). Specifically, `SYNCING` responses should be fork-specific; the search
for a block on one chain MUST NOT trigger a `SYNCING` response for another for a block on one chain MUST NOT trigger a `SYNCING` response for another
chain. chain.
### Re-Orgs
The consensus engine MUST support any chain reorganisation which does *not*
affect the justified checkpoint. The consensus engine MAY support re-orgs
beyond the justified checkpoint.
If the justified checkpoint transitions from `SYNCING` -> `INVALID`, a
consensus engine MAY choose to alert the user and force the application to
exit.
## Merge Transition ## Merge Transition
To protect against attacks during the transition from empty `ExecutionPayload` To protect against attacks during the transition from empty `ExecutionPayload`