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Spec without peer sampling
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| # EIP-7594 -- Fork Choice | ||
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| ## Table of contents | ||
| <!-- TOC --> | ||
| <!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
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| - [Introduction](#introduction) | ||
| - [Helpers](#helpers) | ||
| - [Modified `is_data_available`](#modified-is_data_available) | ||
| - [Updated fork-choice handlers](#updated-fork-choice-handlers) | ||
| - [Modified `on_block`](#modified-on_block) | ||
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| <!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- /TOC --> | ||
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| ## Introduction | ||
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| This is the modification of the fork choice accompanying EIP-7594. | ||
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| ## Helpers | ||
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| ### Modified `is_data_available` | ||
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| ```python | ||
| def is_data_available(beacon_block_root: Root) -> bool: | ||
| # `retrieve_column_sidecars` is implementation and context dependent, replacing | ||
| # `retrieve_blobs_and_proofs`. For the given block root, it returns all column | ||
| # sidecars to sample, or raises an exception if they are not available. | ||
| # The p2p network does not guarantee sidecar retrieval outside of | ||
| # `MIN_EPOCHS_FOR_DATA_COLUMN_SIDECARS_REQUESTS` epochs. | ||
| column_sidecars = retrieve_column_sidecars(beacon_block_root) | ||
| return all( | ||
| verify_data_column_sidecar_kzg_proofs(column_sidecar) | ||
| for column_sidecar in column_sidecars | ||
| ) | ||
| ``` | ||
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| ## Updated fork-choice handlers | ||
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| ### Modified `on_block` | ||
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| *Note*: The only modification is that `is_data_available` does not take `blob_kzg_commitments` as input. | ||
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| ```python | ||
| def on_block(store: Store, signed_block: SignedBeaconBlock) -> None: | ||
| """ | ||
| Run ``on_block`` upon receiving a new block. | ||
| """ | ||
| block = signed_block.message | ||
| # Parent block must be known | ||
| assert block.parent_root in store.block_states | ||
| # Make a copy of the state to avoid mutability issues | ||
| state = copy(store.block_states[block.parent_root]) | ||
| # Blocks cannot be in the future. If they are, their consideration must be delayed until they are in the past. | ||
| assert get_current_slot(store) >= block.slot | ||
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| # Check that block is later than the finalized epoch slot (optimization to reduce calls to get_ancestor) | ||
| finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch) | ||
| assert block.slot > finalized_slot | ||
| # Check block is a descendant of the finalized block at the checkpoint finalized slot | ||
| finalized_checkpoint_block = get_checkpoint_block( | ||
| store, | ||
| block.parent_root, | ||
| store.finalized_checkpoint.epoch, | ||
| ) | ||
| assert store.finalized_checkpoint.root == finalized_checkpoint_block | ||
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| # [Modified in EIP7594] | ||
| assert is_data_available(hash_tree_root(block)) | ||
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| # Check the block is valid and compute the post-state | ||
| block_root = hash_tree_root(block) | ||
| state_transition(state, signed_block, True) | ||
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| # Add new block to the store | ||
| store.blocks[block_root] = block | ||
| # Add new state for this block to the store | ||
| store.block_states[block_root] = state | ||
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| # Add block timeliness to the store | ||
| time_into_slot = (store.time - store.genesis_time) % SECONDS_PER_SLOT | ||
| is_before_attesting_interval = time_into_slot < SECONDS_PER_SLOT // INTERVALS_PER_SLOT | ||
| is_timely = get_current_slot(store) == block.slot and is_before_attesting_interval | ||
| store.block_timeliness[hash_tree_root(block)] = is_timely | ||
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| # Add proposer score boost if the block is timely and not conflicting with an existing block | ||
| is_first_block = store.proposer_boost_root == Root() | ||
| if is_timely and is_first_block: | ||
| store.proposer_boost_root = hash_tree_root(block) | ||
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| # Update checkpoints in store if necessary | ||
| update_checkpoints(store, state.current_justified_checkpoint, state.finalized_checkpoint) | ||
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| # Eagerly compute unrealized justification and finality. | ||
| compute_pulled_up_tip(store, block_root) | ||
| ``` |
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