do not mix in epoch to seed in get_shuffling. add epoch to generate_seed

ethereum · Feb 2, 2019 · 8d82ee8 · 8d82ee8
1 parent 6a9c756
commit 8d82ee8
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
@@ -778,7 +778,6 @@ def get_shuffling(seed: Bytes32,
     committees_per_epoch = get_epoch_committee_count(len(active_validator_indices))
 
     # Shuffle
-    seed = xor(seed, int_to_bytes32(epoch))
     shuffled_active_validator_indices = shuffle(active_validator_indices, seed)
 
     # Split the shuffled list into committees_per_epoch pieces
@@ -942,7 +941,8 @@ def generate_seed(state: BeaconState,
     """
     return hash(
         get_randao_mix(state, epoch - SEED_LOOKAHEAD) +
-        get_active_index_root(state, epoch)
+        get_active_index_root(state, epoch) +
+        int_to_bytes32(epoch)
     )
 ```