diff --git a/beacon_chain/types/src/crosslink_record.rs b/beacon_chain/types/src/crosslink_record.rs
index a28284681..2c7525fad 100644
--- a/beacon_chain/types/src/crosslink_record.rs
+++ b/beacon_chain/types/src/crosslink_record.rs
@@ -2,7 +2,8 @@ use super::Hash256;
 
 #[derive(Clone)]
 pub struct CrosslinkRecord {
-    pub dynasty: u64,
+    pub recently_changed: bool,
+    pub slot: u64,
     pub hash: Hash256,
 }
 
@@ -10,7 +11,8 @@ impl CrosslinkRecord {
     /// Generates a new instance where `dynasty` and `hash` are both zero.
     pub fn zero() -> Self {
         Self {
-            dynasty: 0,
+            recently_changed: false,
+            slot: 0,
             hash: Hash256::zero(),
         }
     }
@@ -23,7 +25,8 @@ mod tests {
     #[test]
     fn test_crosslink_record_zero() {
         let c = CrosslinkRecord::zero();
-        assert_eq!(c.dynasty, 0);
+        assert_eq!(c.recently_changed, false);
+        assert_eq!(c.slot, 0);
         assert!(c.hash.is_zero());
     }
 }
diff --git a/beacon_chain/types/src/crystallized_state.rs b/beacon_chain/types/src/crystallized_state.rs
index e6d901495..580fc04b0 100644
--- a/beacon_chain/types/src/crystallized_state.rs
+++ b/beacon_chain/types/src/crystallized_state.rs
@@ -1,65 +1,21 @@
 use super::validator_record::ValidatorRecord;
 use super::crosslink_record::CrosslinkRecord;
 use super::shard_and_committee::ShardAndCommittee;
-use super::ethereum_types::U256;
 use super::Hash256;
 
 
 pub struct CrystallizedState {
+    pub validator_set_change_slot: u64,
     pub validators: Vec<ValidatorRecord>,
-    pub epoch_number: u64,
-    pub indicies_for_heights: Vec<ShardAndCommittee>,
-    pub last_justified_slot: u64,
-    pub justified_streak: u16,
+    pub crosslinks: Vec<CrosslinkRecord>,
+    pub last_state_recalculation_slot: u64,
     pub last_finalized_slot: u64,
-    pub current_dynasty: u64,
-    pub crosslinking_shard_start: u16,
-    pub crosslink_records: Vec<CrosslinkRecord>,
-    pub total_deposits: U256,
-    pub dynasty_seed: Hash256,
-    pub dynasty_seed_last_reset: u64,
-}
-
-impl CrystallizedState {
-    /// Returns a new instance where all fields are either zero or an
-    /// empty vector.
-    pub fn zero() -> Self {
-        Self {
-            validators: vec![],
-            epoch_number: 0,
-            indicies_for_heights: vec![],
-            last_justified_slot: 0,
-            justified_streak: 0,
-            last_finalized_slot: 0,
-            current_dynasty: 0,
-            crosslinking_shard_start: 0,
-            crosslink_records: vec![],
-            total_deposits: U256::zero(),
-            dynasty_seed: Hash256::zero(),
-            dynasty_seed_last_reset: 0,
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_cry_state_zero() {
-        let c = CrystallizedState::zero();
-        assert_eq!(c.validators.len(), 0);
-        assert_eq!(c.epoch_number, 0);
-        assert_eq!(c.indicies_for_heights.len(), 0);
-        assert_eq!(c.last_justified_slot, 0);
-        assert_eq!(c.justified_streak, 0);
-        assert_eq!(c.last_finalized_slot, 0);
-        assert_eq!(c.current_dynasty, 0);
-        assert_eq!(c.crosslinking_shard_start, 0);
-        assert_eq!(c.crosslink_records.len(), 0);
-        assert!(c.total_deposits.is_zero());
-        assert!(c.dynasty_seed.is_zero());
-        assert_eq!(c.dynasty_seed_last_reset, 0);
-    }
-
+    pub last_justified_slot: u64,
+    pub justified_streak: u64,
+    pub shard_and_committee_for_slots: Vec<Vec<ShardAndCommittee>>,
+    pub deposits_penalized_in_period: u32,
+    pub validator_set_delta_hash_chain: Hash256,
+    pub pre_fork_version: u32,
+    pub post_fork_version: u32,
+    pub fork_slot_number: u32,
 }