diff --git a/base_layer/core/src/consensus/consensus_encoding/hashing.rs b/base_layer/core/src/consensus/consensus_encoding/hashing.rs
index 5fb0d2a650..8c66d25b67 100644
--- a/base_layer/core/src/consensus/consensus_encoding/hashing.rs
+++ b/base_layer/core/src/consensus/consensus_encoding/hashing.rs
@@ -147,7 +147,7 @@ mod tests {
 
     #[test]
     fn it_hashes_using_the_domain_hasher() {
-        let mut hasher = Blake2b::<U64>::default();
+        let mut hasher = Blake2b::<U32>::default();
         TestHashDomain::add_domain_separation_tag(&mut hasher, "foo");
 
         let expected_hash = hasher.chain_update(b"\xff\x00\x00\x00\x00\x00\x00\x00").finalize();
@@ -162,7 +162,7 @@ mod tests {
     fn it_adds_to_hash_challenge_in_complete_chunks() {
         // Script is chosen because the consensus encoding impl for TariScript has 2 writes
         let test_subject = script!(Nop);
-        let mut hasher = Blake2b::<U64>::default();
+        let mut hasher = Blake2b::<U32>::default();
         TestHashDomain::add_domain_separation_tag(&mut hasher, "foo");
 
         let expected_hash = hasher.chain_update(b"\x01\x73").finalize();
diff --git a/base_layer/core/src/transactions/transaction_components/side_chain/validator_node_signature.rs b/base_layer/core/src/transactions/transaction_components/side_chain/validator_node_signature.rs
index cc74ff4f8e..e06e89f594 100644
--- a/base_layer/core/src/transactions/transaction_components/side_chain/validator_node_signature.rs
+++ b/base_layer/core/src/transactions/transaction_components/side_chain/validator_node_signature.rs
@@ -22,10 +22,10 @@
 
 use blake2::Blake2b;
 use borsh::{BorshDeserialize, BorshSerialize};
-use digest::consts::U32;
+use digest::consts::U64;
 use rand::rngs::OsRng;
 use serde::{Deserialize, Serialize};
-use tari_common_types::types::{FixedHash, PrivateKey, PublicKey, Signature};
+use tari_common_types::types::{PrivateKey, PublicKey, Signature};
 use tari_crypto::{hash_domain, hashing::DomainSeparatedHasher, keys::PublicKey as PublicKeyT};
 use tari_utilities::ByteArray;
 
@@ -50,13 +50,13 @@ impl ValidatorNodeSignature {
         let (secret_nonce, public_nonce) = PublicKey::random_keypair(&mut OsRng);
         let public_key = PublicKey::from_secret_key(private_key);
         let challenge = Self::construct_challenge(&public_key, &public_nonce, msg);
-        let signature = Signature::sign_raw(private_key, secret_nonce, &*challenge)
-            .expect("Sign cannot fail with 32-byte challenge and a RistrettoPublicKey");
+        let signature = Signature::sign_raw(private_key, secret_nonce, &challenge)
+            .expect("Sign cannot fail with 64-byte challenge and a RistrettoPublicKey");
         Self { public_key, signature }
     }
 
-    fn construct_challenge(public_key: &PublicKey, public_nonce: &PublicKey, msg: &[u8]) -> FixedHash {
-        let hasher = DomainSeparatedHasher::<Blake2b<U32>, ValidatorNodeHashDomain>::new_with_label("registration")
+    fn construct_challenge(public_key: &PublicKey, public_nonce: &PublicKey, msg: &[u8]) -> [u8; 64] {
+        let hasher = DomainSeparatedHasher::<Blake2b<U64>, ValidatorNodeHashDomain>::new_with_label("registration")
             .chain(public_key.as_bytes())
             .chain(public_nonce.as_bytes())
             .chain(msg);
@@ -65,7 +65,7 @@ impl ValidatorNodeSignature {
 
     pub fn is_valid_signature_for(&self, msg: &[u8]) -> bool {
         let challenge = Self::construct_challenge(&self.public_key, self.signature.get_public_nonce(), msg);
-        self.signature.verify_challenge(&self.public_key, &*challenge)
+        self.signature.verify_challenge(&self.public_key, &challenge)
     }
 
     pub fn public_key(&self) -> &PublicKey {