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I have a question about when the fork-choice rule is checked in real implementation or in the specification. Maintaining a fork-choice store is important and due to network delay, there may happen temporal fork. In this case, as I understand, the fork-choice rule (i.e., in this case, LMD-GHOST) decides the canonical head (simply the most voted block win).

  1. When a validator receives any new unaggregated/aggregated attestation
    • This may require too much computation
  2. When a validator receives a new beacon block
    • e.g., during per-block processing
  3. When a validator became a proposer
  4. When slot/epoch starts or ends
    • e.g., during per-slot/epoch processing

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