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Add notes in merge/fork.md

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lsankar4033 2021-09-08 13:03:05 -07:00
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@ -97,13 +97,13 @@ def upgrade_to_merge(pre: altair.BeaconState) -> BeaconState:
# Execution-layer
latest_execution_payload_header=ExecutionPayloadHeader(),
)
return post
```
### Initializing transition store
If `state.slot % SLOTS_PER_EPOCH == 0` and `compute_epoch_at_slot(state.slot) == MERGE_FORK_EPOCH`, a transition store is initialized to be further utilized by the transition process of the Merge.
If `state.slot % SLOTS_PER_EPOCH == 0`, `compute_epoch_at_slot(state.slot) == MERGE_FORK_EPOCH`, and the transition store has not already been initialized, a transition store is initialized to be further utilized by the transition process of the Merge.
Transition store initialization occurs after the state has been modified by corresponding `upgrade_to_merge` function.
@ -127,3 +127,6 @@ def initialize_transition_store(state: BeaconState) -> TransitionStore:
pow_block = get_pow_block(state.eth1_data.block_hash)
return get_transition_store(pow_block)
```
Note that transition store can also be initialized at client startup by [overriding terminal total
difficulty](specs/merge/client_settings.md#override-terminal-total-difficulty).