Rename get_ancestor_at_epoch_boundary to get_checkpoint_block

specs/bellatrix/fork-choice.md

@@ -170,7 +170,7 @@ def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
     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
-    assert store.finalized_checkpoint.root == get_ancestor_at_epoch_boundary(
+    assert store.finalized_checkpoint.root == get_checkpoint_block(
         store,
         block.parent_root,
         store.finalized_checkpoint.epoch,

specs/deneb/fork-choice.md

@@ -82,7 +82,7 @@ def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
     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
-    assert store.finalized_checkpoint.root == get_ancestor_at_epoch_boundary(
+    assert store.finalized_checkpoint.root == get_checkpoint_block(
         store,
         block.parent_root,
         store.finalized_checkpoint.epoch,

specs/phase0/fork-choice.md

@@ -18,7 +18,7 @@
     - [`get_current_slot`](#get_current_slot)
     - [`compute_slots_since_epoch_start`](#compute_slots_since_epoch_start)
     - [`get_ancestor`](#get_ancestor)
-    - [`get_ancestor_at_epoch_boundary`](#get_ancestor_at_epoch_boundary)
+    - [`get_checkpoint_block`](#get_checkpoint_block)
     - [`get_weight`](#get_weight)
     - [`get_voting_source`](#get_voting_source)
     - [`filter_block_tree`](#filter_block_tree)
@@ -193,10 +193,10 @@ def get_ancestor(store: Store, root: Root, slot: Slot) -> Root:
     return root
 ```
 
-#### `get_ancestor_at_epoch_boundary`
+#### `get_checkpoint_block`
 
 ```python
-def get_ancestor_at_epoch_boundary(store: Store, root: Root, epoch: Epoch) -> Root:
+def get_checkpoint_block(store: Store, root: Root, epoch: Epoch) -> Root:
     """
     Compute the epoch boundary block for epoch ``epoch`` in the chain of block ``root``
     """
@@ -292,7 +292,7 @@ def filter_block_tree(store: Store, block_root: Root, blocks: Dict[Root, BeaconB
 
     correct_finalized = (
         store.finalized_checkpoint.epoch == GENESIS_EPOCH
-        or store.finalized_checkpoint.root == get_ancestor_at_epoch_boundary(
+        or store.finalized_checkpoint.root == get_checkpoint_block(
             store,
             block_root,
             store.finalized_checkpoint.epoch,
@@ -457,7 +457,7 @@ def validate_on_attestation(store: Store, attestation: Attestation, is_from_bloc
     assert store.blocks[attestation.data.beacon_block_root].slot <= attestation.data.slot
 
     # LMD vote must be consistent with FFG vote target
-    assert target.root == get_ancestor_at_epoch_boundary(store, attestation.data.beacon_block_root, target.epoch)
+    assert target.root == get_checkpoint_block(store, attestation.data.beacon_block_root, target.epoch)
 
     # Attestations can only affect the fork choice of subsequent slots.
     # Delay consideration in the fork choice until their slot is in the past.
@@ -520,7 +520,7 @@ def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
     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
-    assert store.finalized_checkpoint.root == get_ancestor_at_epoch_boundary(
+    assert store.finalized_checkpoint.root == get_checkpoint_block(
         store,
         block.parent_root,
         store.finalized_checkpoint.epoch,

specs/phase0/p2p-interface.md

@@ -317,7 +317,7 @@ The following validations MUST pass before forwarding the `signed_beacon_block`
 - _[REJECT]_ The block's parent (defined by `block.parent_root`) passes validation.
 - _[REJECT]_ The block is from a higher slot than its parent.
 - _[REJECT]_ The current `finalized_checkpoint` is an ancestor of `block` -- i.e.
-  `get_ancestor_at_epoch_boundary(store, block.parent_root, store.finalized_checkpoint.epoch)
+  `get_checkpoint_block(store, block.parent_root, store.finalized_checkpoint.epoch)
   == store.finalized_checkpoint.root`
 - _[REJECT]_ The block is proposed by the expected `proposer_index` for the block's slot
   in the context of the current shuffling (defined by `parent_root`/`slot`).
@@ -356,7 +356,7 @@ The following validations MUST pass before forwarding the `signed_aggregate_and_
   (a client MAY queue aggregates for processing once block is retrieved).
 - _[REJECT]_ The block being voted for (`aggregate.data.beacon_block_root`) passes validation.
 - _[IGNORE]_ The current `finalized_checkpoint` is an ancestor of the `block` defined by `aggregate.data.beacon_block_root` -- i.e.
-  `get_ancestor_at_epoch_boundary(store, aggregate.data.beacon_block_root, finalized_checkpoint.epoch)
+  `get_checkpoint_block(store, aggregate.data.beacon_block_root, finalized_checkpoint.epoch)
   == store.finalized_checkpoint.root`
 
 
@@ -425,9 +425,9 @@ The following validations MUST pass before forwarding the `attestation` on the s
   (a client MAY queue attestations for processing once block is retrieved).
 - _[REJECT]_ The block being voted for (`attestation.data.beacon_block_root`) passes validation.
 - _[REJECT]_ The attestation's target block is an ancestor of the block named in the LMD vote -- i.e.
-  `get_ancestor_at_epoch_boundary(store, attestation.data.beacon_block_root, attestation.data.target.epoch) == attestation.data.target.root`
+  `get_checkpoint_block(store, attestation.data.beacon_block_root, attestation.data.target.epoch) == attestation.data.target.root`
 - _[IGNORE]_ The current `finalized_checkpoint` is an ancestor of the `block` defined by `attestation.data.beacon_block_root` -- i.e.
-  `get_ancestor_at_epoch_boundary(store, attestation.data.beacon_block_root, store.finalized_checkpoint.epoch)
+  `get_checkpoint_block(store, attestation.data.beacon_block_root, store.finalized_checkpoint.epoch)
   == store.finalized_checkpoint.root`