diff --git a/beacon_chain/utils/bls/src/aggregate_signature.rs b/beacon_chain/utils/bls/src/aggregate_signature.rs
index 5cc9c3c21..2e3630268 100644
--- a/beacon_chain/utils/bls/src/aggregate_signature.rs
+++ b/beacon_chain/utils/bls/src/aggregate_signature.rs
@@ -24,15 +24,8 @@ impl AggregateSignature {
     ///
     /// Only returns `true` if the set of keys in the `AggregatePublicKey` match the set of keys
     /// that signed the `AggregateSignature`.
-    pub fn verify(&self, msg: &[u8], avk: &AggregatePublicKey) -> bool {
-        self.0.verify(msg, avk)
-    }
-}
-
-impl Default for AggregateSignature {
-    /// A "default" signature is a signature across an empty message by a secret key of 48 zeros.
-    fn default() -> Self {
-        AggregateSignature::new()
+    pub fn verify(&self, msg: &[u8], aggregate_public_key: &AggregatePublicKey) -> bool {
+        self.0.verify(msg, aggregate_public_key)
     }
 }
 
diff --git a/beacon_chain/utils/bls/src/signature.rs b/beacon_chain/utils/bls/src/signature.rs
index bfeaca45e..ebdb5b817 100644
--- a/beacon_chain/utils/bls/src/signature.rs
+++ b/beacon_chain/utils/bls/src/signature.rs
@@ -36,17 +36,6 @@ impl Signature {
     }
 }
 
-impl Default for Signature {
-    /// A "default" signature is a signature across an empty message by a secret key of 48 zeros.
-    fn default() -> Self {
-        let sk = match SecretKey::from_bytes(&[0; 48]) {
-            Ok(key) => key,
-            _ => unreachable!(), // Key is static, should not fail.
-        };
-        Signature(RawSignature::new(&[], &sk))
-    }
-}
-
 impl Encodable for Signature {
     fn ssz_append(&self, s: &mut SszStream) {
         s.append_vec(&self.0.as_bytes());