diff --git a/eth2/beacon/epoch_processing_helpers.py b/eth2/beacon/epoch_processing_helpers.py
index 984b2a31a6..58be9ac50f 100644
--- a/eth2/beacon/epoch_processing_helpers.py
+++ b/eth2/beacon/epoch_processing_helpers.py
@@ -104,19 +104,19 @@ def get_winning_root(
         committee_config: CommitteeConfig) -> Tuple[Hash32, Gwei]:
     winning_root = None
     winning_root_balance: Gwei = Gwei(0)
-    shard_block_roots = set(
+    crosslink_data_roots = set(
         [
-            a.data.shard_block_root for a in attestations
+            a.data.crosslink_data_root for a in attestations
             if a.data.shard == shard
         ]
     )
-    for shard_block_root in shard_block_roots:
+    for crosslink_data_root in crosslink_data_roots:
         attesting_validator_indices = get_attester_indices_from_attesttion(
             state=state,
             attestations=[
                 a
                 for a in attestations
-                if a.data.shard == shard and a.data.shard_block_root == shard_block_root
+                if a.data.shard == shard and a.data.crosslink_data_root == crosslink_data_root
             ],
             committee_config=committee_config,
         )
@@ -126,11 +126,11 @@ def get_winning_root(
             max_deposit_amount,
         )
         if total_attesting_balance > winning_root_balance:
-            winning_root = shard_block_root
+            winning_root = crosslink_data_root
             winning_root_balance = total_attesting_balance
         elif total_attesting_balance == winning_root_balance and winning_root_balance > 0:
-            if shard_block_root < winning_root:
-                winning_root = shard_block_root
+            if crosslink_data_root < winning_root:
+                winning_root = crosslink_data_root
 
     if winning_root is None:
         raise NoWinningRootError
diff --git a/eth2/beacon/on_genesis.py b/eth2/beacon/on_genesis.py
index 960bb9b9eb..0479e644d8 100644
--- a/eth2/beacon/on_genesis.py
+++ b/eth2/beacon/on_genesis.py
@@ -108,7 +108,7 @@ def get_genesis_beacon_state(*,
 
         # Recent state
         latest_crosslinks=(
-            (CrosslinkRecord(epoch=genesis_epoch, shard_block_root=ZERO_HASH32),) * shard_count
+            (CrosslinkRecord(epoch=genesis_epoch, crosslink_data_root=ZERO_HASH32),) * shard_count
         ),
         latest_block_roots=(ZERO_HASH32,) * latest_block_roots_length,
         latest_active_index_roots=(ZERO_HASH32,) * latest_active_index_roots_length,
diff --git a/eth2/beacon/state_machines/forks/serenity/block_validation.py b/eth2/beacon/state_machines/forks/serenity/block_validation.py
index 0cfb0835c1..405fc237c1 100644
--- a/eth2/beacon/state_machines/forks/serenity/block_validation.py
+++ b/eth2/beacon/state_machines/forks/serenity/block_validation.py
@@ -262,10 +262,10 @@ def validate_attestation(state: BeaconState,
 
     validate_attestation_latest_crosslink_root(
         attestation.data,
-        latest_crosslink_root=state.latest_crosslinks[attestation.data.shard].shard_block_root,
+        latest_crosslink_root=state.latest_crosslinks[attestation.data.shard].crosslink_data_root,
     )
 
-    validate_attestation_shard_block_root(attestation.data)
+    validate_attestation_crosslink_data_root(attestation.data)
 
     validate_attestation_aggregate_signature(
         state,
@@ -360,41 +360,41 @@ def validate_attestation_justified_block_root(attestation_data: AttestationData,
 def validate_attestation_latest_crosslink_root(attestation_data: AttestationData,
                                                latest_crosslink_root: Hash32) -> None:
     """
-    Validate that either the attestation ``latest_crosslink_root`` or ``shard_block_root``
+    Validate that either the attestation ``latest_crosslink_root`` or ``crosslink_data_root``
     field of ``attestation_data`` is the provided ``latest_crosslink_root``.
     Raise ``ValidationError`` if it's invalid.
     """
-    acceptable_shard_block_roots = {
+    acceptable_crosslink_data_roots = {
         attestation_data.latest_crosslink_root,
-        attestation_data.shard_block_root,
+        attestation_data.crosslink_data_root,
     }
-    if latest_crosslink_root not in acceptable_shard_block_roots:
+    if latest_crosslink_root not in acceptable_crosslink_data_roots:
         raise ValidationError(
             "Neither the attestation ``latest_crosslink_root`` nor the attestation "
-            "``shard_block_root`` are equal to the ``latest_crosslink_root``.\n"
+            "``crosslink_data_root`` are equal to the ``latest_crosslink_root``.\n"
             "\tFound: %s and %s, Expected %s" %
             (
                 attestation_data.latest_crosslink_root,
-                attestation_data.shard_block_root,
+                attestation_data.crosslink_data_root,
                 latest_crosslink_root,
             )
         )
 
 
-def validate_attestation_shard_block_root(attestation_data: AttestationData) -> None:
+def validate_attestation_crosslink_data_root(attestation_data: AttestationData) -> None:
     """
-    Validate ``shard_block_root`` field of `attestation_data`.
+    Validate ``crosslink_data_root`` field of `attestation_data`.
     Raise ``ValidationError`` if it's invalid.
 
-    Note: This is the Phase 0 version of ``shard_block_root`` validation.
+    Note: This is the Phase 0 version of ``crosslink_data_root`` validation.
     This is a built-in stub and will be changed in phase 1.
     """
-    if attestation_data.shard_block_root != ZERO_HASH32:
+    if attestation_data.crosslink_data_root != ZERO_HASH32:
         raise ValidationError(
-            "Attestation ``shard_block_root`` is not ZERO_HASH32.\n"
+            "Attestation ``crosslink_data_root`` is not ZERO_HASH32.\n"
             "\tFound: %s, Expected %s" %
             (
-                attestation_data.shard_block_root,
+                attestation_data.crosslink_data_root,
                 ZERO_HASH32,
             )
         )
diff --git a/eth2/beacon/state_machines/forks/serenity/epoch_processing.py b/eth2/beacon/state_machines/forks/serenity/epoch_processing.py
index 3b43dd0828..f7a2f317cd 100644
--- a/eth2/beacon/state_machines/forks/serenity/epoch_processing.py
+++ b/eth2/beacon/state_machines/forks/serenity/epoch_processing.py
@@ -276,7 +276,7 @@ def process_crosslinks(state: BeaconState, config: BeaconConfig) -> BeaconState:
                         shard,
                         CrosslinkRecord(
                             epoch=state.current_epoch(config.SLOTS_PER_EPOCH),
-                            shard_block_root=winning_root,
+                            crosslink_data_root=winning_root,
                         ),
                     )
                 else:
@@ -663,7 +663,7 @@ def _process_rewards_and_penalties_for_crosslinks(
                     attestations=(
                         a
                         for a in filtered_attestations
-                        if a.data.shard == shard and a.data.shard_block_root == winning_root
+                        if a.data.shard == shard and a.data.crosslink_data_root == winning_root
                     ),
                     committee_config=CommitteeConfig(config),
                 )
diff --git a/eth2/beacon/tools/builder/validator.py b/eth2/beacon/tools/builder/validator.py
index 3596c7a77c..c930e6b38f 100644
--- a/eth2/beacon/tools/builder/validator.py
+++ b/eth2/beacon/tools/builder/validator.py
@@ -347,14 +347,14 @@ def create_mock_signed_attestations_at_slot(
         committee, shard = crosslink_committee
 
         num_voted_attesters = int(len(committee) * voted_attesters_ratio)
-        latest_crosslink_root = state.latest_crosslinks[shard].shard_block_root
+        latest_crosslink_root = state.latest_crosslinks[shard].crosslink_data_root
 
         attestation_data = AttestationData(
             slot=attestation_slot,
             shard=shard,
             beacon_block_root=beacon_block_root,
             epoch_boundary_root=epoch_boundary_root,
-            shard_block_root=ZERO_HASH32,
+            crosslink_data_root=ZERO_HASH32,
             latest_crosslink_root=latest_crosslink_root,
             justified_epoch=state.justified_epoch,
             justified_block_root=justified_block_root,
diff --git a/eth2/beacon/types/attestation_data.py b/eth2/beacon/types/attestation_data.py
index 3fb2eea12e..4bd86d8e18 100644
--- a/eth2/beacon/types/attestation_data.py
+++ b/eth2/beacon/types/attestation_data.py
@@ -27,7 +27,7 @@ class AttestationData(ssz.Serializable):
         # Hash of the ancestor at the epoch boundary
         ('epoch_boundary_root', bytes32),
         # Shard block root being attested to
-        ('shard_block_root', bytes32),
+        ('crosslink_data_root', bytes32),
         # Last crosslink hash
         ('latest_crosslink_root', bytes32),
         # epoch of the last justified beacon block
@@ -41,7 +41,7 @@ def __init__(self,
                  shard: Shard,
                  beacon_block_root: Hash32,
                  epoch_boundary_root: Hash32,
-                 shard_block_root: Hash32,
+                 crosslink_data_root: Hash32,
                  latest_crosslink_root: Hash32,
                  justified_epoch: Epoch,
                  justified_block_root: Hash32) -> None:
@@ -50,7 +50,7 @@ def __init__(self,
             shard,
             beacon_block_root,
             epoch_boundary_root,
-            shard_block_root,
+            crosslink_data_root,
             latest_crosslink_root,
             justified_epoch,
             justified_block_root,
diff --git a/eth2/beacon/types/crosslink_records.py b/eth2/beacon/types/crosslink_records.py
index 75cf947e42..de4cbe862f 100644
--- a/eth2/beacon/types/crosslink_records.py
+++ b/eth2/beacon/types/crosslink_records.py
@@ -17,14 +17,14 @@ class CrosslinkRecord(ssz.Serializable):
         # Epoch during which crosslink was added
         ('epoch', uint64),
         # Shard chain block root
-        ('shard_block_root', bytes32),
+        ('crosslink_data_root', bytes32),
     ]
 
     def __init__(self,
                  epoch: Epoch,
-                 shard_block_root: Hash32) -> None:
+                 crosslink_data_root: Hash32) -> None:
 
         super().__init__(
             epoch=epoch,
-            shard_block_root=shard_block_root,
+            crosslink_data_root=crosslink_data_root,
         )
diff --git a/eth2/beacon/types/states.py b/eth2/beacon/types/states.py
index 75b8309998..7f910337fc 100644
--- a/eth2/beacon/types/states.py
+++ b/eth2/beacon/types/states.py
@@ -232,7 +232,12 @@ def create_filled_state(cls,
 
             # Recent state
             latest_crosslinks=(
-                (CrosslinkRecord(epoch=genesis_epoch, shard_block_root=ZERO_HASH32),) * shard_count
+                (
+                    CrosslinkRecord(
+                        epoch=genesis_epoch,
+                        crosslink_data_root=ZERO_HASH32,
+                    ),
+                ) * shard_count
             ),
             latest_block_roots=(ZERO_HASH32,) * latest_block_roots_length,
             latest_active_index_roots=(ZERO_HASH32,) * latest_active_index_roots_length,
diff --git a/tests/core/p2p-proto/bcc/test_commands.py b/tests/core/p2p-proto/bcc/test_commands.py
index c97362e36e..ca2d611248 100644
--- a/tests/core/p2p-proto/bcc/test_commands.py
+++ b/tests/core/p2p-proto/bcc/test_commands.py
@@ -166,7 +166,7 @@ async def test_send_single_attestation(request, event_loop):
             shard=1,
             beacon_block_root=ZERO_HASH32,
             epoch_boundary_root=ZERO_HASH32,
-            shard_block_root=ZERO_HASH32,
+            crosslink_data_root=ZERO_HASH32,
             latest_crosslink_root=ZERO_HASH32,
             justified_epoch=SERENITY_CONFIG.GENESIS_EPOCH,
             justified_block_root=ZERO_HASH32,
@@ -193,7 +193,7 @@ async def test_send_multiple_attestations(request, event_loop):
                 shard=shard,
                 beacon_block_root=ZERO_HASH32,
                 epoch_boundary_root=ZERO_HASH32,
-                shard_block_root=ZERO_HASH32,
+                crosslink_data_root=ZERO_HASH32,
                 latest_crosslink_root=ZERO_HASH32,
                 justified_epoch=SERENITY_CONFIG.GENESIS_EPOCH,
                 justified_block_root=ZERO_HASH32,
diff --git a/tests/eth2/beacon/conftest.py b/tests/eth2/beacon/conftest.py
index bd3db42566..86d70ed6b0 100644
--- a/tests/eth2/beacon/conftest.py
+++ b/tests/eth2/beacon/conftest.py
@@ -106,7 +106,7 @@ def sample_attestation_data_params():
         'shard': 12,
         'beacon_block_root': b'\x11' * 32,
         'epoch_boundary_root': b'\x22' * 32,
-        'shard_block_root': b'\x33' * 32,
+        'crosslink_data_root': b'\x33' * 32,
         'latest_crosslink_root': b'\x44' * 32,
         'justified_epoch': 0,
         'justified_block_root': b'\x55' * 32,
@@ -198,7 +198,7 @@ def sample_eth1_data_vote_params(sample_eth1_data_params):
 def sample_crosslink_record_params():
     return {
         'epoch': 0,
-        'shard_block_root': b'\x43' * 32,
+        'crosslink_data_root': b'\x43' * 32,
     }
 
 
@@ -586,7 +586,7 @@ def genesis_state(filled_beacon_state,
         latest_crosslinks=tuple(
             CrosslinkRecord(
                 epoch=genesis_epoch,
-                shard_block_root=ZERO_HASH32,
+                crosslink_data_root=ZERO_HASH32,
             )
             for _ in range(shard_count)
         ),
diff --git a/tests/eth2/beacon/state_machines/forks/test_serenity_block_attestation_validation.py b/tests/eth2/beacon/state_machines/forks/test_serenity_block_attestation_validation.py
index 0d2b5a3d21..0b62235c6c 100644
--- a/tests/eth2/beacon/state_machines/forks/test_serenity_block_attestation_validation.py
+++ b/tests/eth2/beacon/state_machines/forks/test_serenity_block_attestation_validation.py
@@ -20,7 +20,7 @@
     validate_attestation_latest_crosslink_root,
     validate_attestation_justified_block_root,
     validate_attestation_justified_epoch,
-    validate_attestation_shard_block_root,
+    validate_attestation_crosslink_data_root,
     validate_attestation_slot,
 )
 from eth2.beacon.tools.builder.validator import (
@@ -166,7 +166,7 @@ def test_validate_attestation_justified_block_root(sample_attestation_data_param
 @pytest.mark.parametrize(
     (
         'attestation_latest_crosslink_root,'
-        'attestation_shard_block_root,'
+        'attestation_crosslink_data_root,'
         'latest_crosslink_root,'
         'is_valid,'
     ),
@@ -180,14 +180,14 @@ def test_validate_attestation_justified_block_root(sample_attestation_data_param
 )
 def test_validate_attestation_latest_crosslink_root(sample_attestation_data_params,
                                                     attestation_latest_crosslink_root,
-                                                    attestation_shard_block_root,
+                                                    attestation_crosslink_data_root,
                                                     latest_crosslink_root,
                                                     is_valid):
     sample_attestation_data_params['latest_crosslink_root'] = attestation_latest_crosslink_root
-    sample_attestation_data_params['shard_block_root'] = attestation_shard_block_root
+    sample_attestation_data_params['crosslink_data_root'] = attestation_crosslink_data_root
     attestation_data = AttestationData(**sample_attestation_data_params).copy(
         latest_crosslink_root=attestation_latest_crosslink_root,
-        shard_block_root=attestation_shard_block_root,
+        crosslink_data_root=attestation_crosslink_data_root,
     )
 
     if is_valid:
@@ -205,7 +205,7 @@ def test_validate_attestation_latest_crosslink_root(sample_attestation_data_para
 
 @pytest.mark.parametrize(
     (
-        'attestation_shard_block_root,'
+        'attestation_crosslink_data_root,'
         'is_valid,'
     ),
     [
@@ -214,20 +214,20 @@ def test_validate_attestation_latest_crosslink_root(sample_attestation_data_para
         (b'\x66' * 32, False),
     ]
 )
-def test_validate_attestation_shard_block_root(sample_attestation_data_params,
-                                               attestation_shard_block_root,
-                                               is_valid):
+def test_validate_attestation_crosslink_data_root(sample_attestation_data_params,
+                                                  attestation_crosslink_data_root,
+                                                  is_valid):
     attestation_data = AttestationData(**sample_attestation_data_params).copy(
-        shard_block_root=attestation_shard_block_root,
+        crosslink_data_root=attestation_crosslink_data_root,
     )
 
     if is_valid:
-        validate_attestation_shard_block_root(
+        validate_attestation_crosslink_data_root(
             attestation_data,
         )
     else:
         with pytest.raises(ValidationError):
-            validate_attestation_shard_block_root(
+            validate_attestation_crosslink_data_root(
                 attestation_data,
             )
 
diff --git a/tests/eth2/beacon/state_machines/forks/test_serenity_epoch_processing.py b/tests/eth2/beacon/state_machines/forks/test_serenity_epoch_processing.py
index 92be4708cb..3568d67c25 100644
--- a/tests/eth2/beacon/state_machines/forks/test_serenity_epoch_processing.py
+++ b/tests/eth2/beacon/state_machines/forks/test_serenity_epoch_processing.py
@@ -293,11 +293,11 @@ def test_process_crosslinks(
         sample_attestation_data_params,
         sample_attestation_params):
     shard = 1
-    shard_block_root = hash_eth2(b'shard_block_root')
+    crosslink_data_root = hash_eth2(b'crosslink_data_root')
     current_slot = config.SLOTS_PER_EPOCH * 2 - 1
 
     genesis_crosslinks = tuple([
-        CrosslinkRecord(epoch=config.GENESIS_EPOCH, shard_block_root=ZERO_HASH32)
+        CrosslinkRecord(epoch=config.GENESIS_EPOCH, crosslink_data_root=ZERO_HASH32)
         for _ in range(shard_count)
     ])
     state = n_validators_state.copy(
@@ -334,7 +334,7 @@ def test_process_crosslinks(
                         data=AttestationData(**sample_attestation_data_params).copy(
                             slot=slot_in_cur_epoch,
                             shard=shard,
-                            shard_block_root=shard_block_root,
+                            crosslink_data_root=crosslink_data_root,
                         ),
                         aggregation_bitfield=aggregation_bitfield,
                     )
@@ -344,18 +344,18 @@ def test_process_crosslinks(
         latest_attestations=cur_epoch_attestations,
     )
     assert (state.latest_crosslinks[shard].epoch == config.GENESIS_EPOCH and
-            state.latest_crosslinks[shard].shard_block_root == ZERO_HASH32)
+            state.latest_crosslinks[shard].crosslink_data_root == ZERO_HASH32)
 
     new_state = process_crosslinks(state, config)
     crosslink_record = new_state.latest_crosslinks[shard]
     if success_crosslink_in_cur_epoch:
         attestation = cur_epoch_attestations[0]
         assert (crosslink_record.epoch == slot_to_epoch(current_slot, slots_per_epoch) and
-                crosslink_record.shard_block_root == attestation.data.shard_block_root and
-                attestation.data.shard_block_root == shard_block_root)
+                crosslink_record.crosslink_data_root == attestation.data.crosslink_data_root and
+                attestation.data.crosslink_data_root == crosslink_data_root)
     else:
         assert (crosslink_record.epoch == config.GENESIS_EPOCH and
-                crosslink_record.shard_block_root == ZERO_HASH32)
+                crosslink_record.crosslink_data_root == ZERO_HASH32)
 
 
 #
@@ -739,13 +739,13 @@ def test_process_rewards_and_penalties_for_crosslinks(
         committee, shard = prev_epoch_crosslink_committees[i]
         # Randomly sample `num_attesting_validators` validators
         # from the committee to attest in this slot.
-        shard_block_root_attesting_validators = random.sample(
+        crosslink_data_root_attesting_validators = random.sample(
             committee,
             num_attesting_validators,
         )
-        each_slot_attestion_validators_list.append(shard_block_root_attesting_validators)
+        each_slot_attestion_validators_list.append(crosslink_data_root_attesting_validators)
         participants_bitfield = get_empty_bitfield(target_committee_size)
-        for index in shard_block_root_attesting_validators:
+        for index in crosslink_data_root_attesting_validators:
             participants_bitfield = set_voted(participants_bitfield, committee.index(index))
         data_slot = i + previous_epoch * slots_per_epoch
         previous_epoch_attestations.append(
@@ -885,7 +885,7 @@ def test_check_if_update_validator_registry(genesis_state,
     if has_crosslink:
         crosslink = CrosslinkRecord(
             epoch=crosslink_epoch,
-            shard_block_root=ZERO_HASH32,
+            crosslink_data_root=ZERO_HASH32,
         )
         latest_crosslinks = state.latest_crosslinks
         for shard in range(config.SHARD_COUNT):
diff --git a/tests/eth2/beacon/test_epoch_processing_helpers.py b/tests/eth2/beacon/test_epoch_processing_helpers.py
index 016b004a20..1f96b96d8e 100644
--- a/tests/eth2/beacon/test_epoch_processing_helpers.py
+++ b/tests/eth2/beacon/test_epoch_processing_helpers.py
@@ -275,19 +275,19 @@ def mock_get_crosslink_committees_at_slot(state,
     )
     # `attestions` contains attestation to different block root by different set of participants
     attestations = (
-        # Attestation to `shard_block_root_1` by `attestation_participants_1`
+        # Attestation to `crosslink_data_root_1` by `attestation_participants_1`
         Attestation(**sample_attestation_params).copy(
             data=AttestationData(**sample_attestation_data_params).copy(
                 shard=shard,
-                shard_block_root=competing_block_roots[0],
+                crosslink_data_root=competing_block_roots[0],
             ),
             aggregation_bitfield=root_1_participants_bitfield
         ),
-        # Attestation to `shard_block_root_2` by `attestation_participants_2`
+        # Attestation to `crosslink_data_root_2` by `attestation_participants_2`
         Attestation(**sample_attestation_params).copy(
             data=AttestationData(**sample_attestation_data_params).copy(
                 shard=shard,
-                shard_block_root=competing_block_roots[1],
+                crosslink_data_root=competing_block_roots[1],
             ),
             aggregation_bitfield=root_2_participants_bitfield
         ),
@@ -306,7 +306,7 @@ def mock_get_crosslink_committees_at_slot(state,
             attestations=(
                 a
                 for a in attestations
-                if a.data.shard == shard and a.data.shard_block_root == winning_root
+                if a.data.shard == shard and a.data.crosslink_data_root == winning_root
             ),
             committee_config=committee_config,
         )
diff --git a/tests/eth2/beacon/test_on_genesis.py b/tests/eth2/beacon/test_on_genesis.py
index 74f4ed08b7..c52e177497 100644
--- a/tests/eth2/beacon/test_on_genesis.py
+++ b/tests/eth2/beacon/test_on_genesis.py
@@ -155,7 +155,7 @@ def test_get_genesis_beacon_state(
     assert len(state.latest_crosslinks) == shard_count
     assert state.latest_crosslinks[0] == CrosslinkRecord(
         epoch=genesis_epoch,
-        shard_block_root=ZERO_HASH32,
+        crosslink_data_root=ZERO_HASH32,
     )
     assert len(state.latest_block_roots) == latest_block_roots_length
     assert state.latest_block_roots[0] == ZERO_HASH32
diff --git a/tests/eth2/beacon/types/test_crosslink_record.py b/tests/eth2/beacon/types/test_crosslink_record.py
index 70ab3a807d..42bfb42d57 100644
--- a/tests/eth2/beacon/types/test_crosslink_record.py
+++ b/tests/eth2/beacon/types/test_crosslink_record.py
@@ -6,4 +6,4 @@
 def test_defaults(sample_crosslink_record_params):
     crosslink = CrosslinkRecord(**sample_crosslink_record_params)
     assert crosslink.epoch == sample_crosslink_record_params['epoch']
-    assert crosslink.shard_block_root == sample_crosslink_record_params['shard_block_root']
+    assert crosslink.crosslink_data_root == sample_crosslink_record_params['crosslink_data_root']