Clean up electra LC

specs/electra/light-client/full-node.md

@@ -9,66 +9,10 @@
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
 
 - [Introduction](#introduction)
-- [Helper functions](#helper-functions)
-  - [Modified `block_to_light_client_header`](#modified-block_to_light_client_header)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 <!-- /TOC -->
 
 ## Introduction
 
-Execution payload data is updated to account for the Electra upgrade.
+No changes occurred in Electra upgrade.
-
-## Helper functions
-
-### Modified `block_to_light_client_header`
-
-```python
-def block_to_light_client_header(block: SignedBeaconBlock) -> LightClientHeader:
-    epoch = compute_epoch_at_slot(block.message.slot)
-
-    if epoch >= CAPELLA_FORK_EPOCH:
-        payload = block.message.body.execution_payload
-        execution_header = ExecutionPayloadHeader(
-            parent_hash=payload.parent_hash,
-            fee_recipient=payload.fee_recipient,
-            state_root=payload.state_root,
-            receipts_root=payload.receipts_root,
-            logs_bloom=payload.logs_bloom,
-            prev_randao=payload.prev_randao,
-            block_number=payload.block_number,
-            gas_limit=payload.gas_limit,
-            gas_used=payload.gas_used,
-            timestamp=payload.timestamp,
-            extra_data=payload.extra_data,
-            base_fee_per_gas=payload.base_fee_per_gas,
-            block_hash=payload.block_hash,
-            transactions_root=hash_tree_root(payload.transactions),
-            withdrawals_root=hash_tree_root(payload.withdrawals),
-        )
-        if epoch >= DENEB_FORK_EPOCH:
-            execution_header.blob_gas_used = payload.blob_gas_used
-            execution_header.excess_blob_gas = payload.excess_blob_gas
-
-        execution_branch = ExecutionBranch(
-            compute_merkle_proof(block.message.body, EXECUTION_PAYLOAD_GINDEX))
-    else:
-        # Note that during fork transitions, `finalized_header` may still point to earlier forks.
-        # While Bellatrix blocks also contain an `ExecutionPayload` (minus `withdrawals_root`),
-        # it was not included in the corresponding light client data. To ensure compatibility
-        # with legacy data going through `upgrade_lc_header_to_capella`, leave out execution data.
-        execution_header = ExecutionPayloadHeader()
-        execution_branch = ExecutionBranch()
-
-    return LightClientHeader(
-        beacon=BeaconBlockHeader(
-            slot=block.message.slot,
-            proposer_index=block.message.proposer_index,
-            parent_root=block.message.parent_root,
-            state_root=block.message.state_root,
-            body_root=hash_tree_root(block.message.body),
-        ),
-        execution=execution_header,
-        execution_branch=execution_branch,
-    )
-```

specs/electra/light-client/sync-protocol.md

@@ -18,7 +18,6 @@
   - [Modified `current_sync_committee_gindex_at_slot`](#modified-current_sync_committee_gindex_at_slot)
   - [Modified `next_sync_committee_gindex_at_slot`](#modified-next_sync_committee_gindex_at_slot)
   - [Modified `get_lc_execution_root`](#modified-get_lc_execution_root)
-  - [Modified `is_valid_light_client_header`](#modified-is_valid_light_client_header)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 <!-- /TOC -->
@@ -152,28 +151,3 @@ def get_lc_execution_root(header: LightClientHeader) -> Root:
 
     return Root()
 ```
-
-### Modified `is_valid_light_client_header`
-
-```python
-def is_valid_light_client_header(header: LightClientHeader) -> bool:
-    epoch = compute_epoch_at_slot(header.beacon.slot)
-
-    if epoch < DENEB_FORK_EPOCH:
-        if header.execution.blob_gas_used != uint64(0) or header.execution.excess_blob_gas != uint64(0):
-            return False
-
-    if epoch < CAPELLA_FORK_EPOCH:
-        return (
-            header.execution == ExecutionPayloadHeader()
-            and header.execution_branch == ExecutionBranch()
-        )
-
-    return is_valid_merkle_branch(
-        leaf=get_lc_execution_root(header),
-        branch=header.execution_branch,
-        depth=floorlog2(EXECUTION_PAYLOAD_GINDEX),
-        index=get_subtree_index(EXECUTION_PAYLOAD_GINDEX),
-        root=header.beacon.body_root,
-    )
-```