diff --git a/rust/src/protocol_types/fixed_tx.rs b/rust/src/protocol_types/fixed_tx.rs
index cad72646..79989a42 100644
--- a/rust/src/protocol_types/fixed_tx.rs
+++ b/rust/src/protocol_types/fixed_tx.rs
@@ -62,6 +62,21 @@ impl FixedTransaction {
         })
     }
 
+    pub fn new_from_body_bytes(raw_body: &[u8]) -> Result<FixedTransaction, JsError> {
+        let body = TransactionBody::from_bytes(raw_body.to_vec())?;
+        let tx_hash = TransactionHash::from(blake2b256(raw_body));
+
+        Ok(FixedTransaction {
+            body,
+            body_bytes: raw_body.to_vec(),
+            tx_hash,
+            witness_set: FixedTxWitnessesSet::new_empty(),
+            is_valid: true,
+            auxiliary_data: None,
+            auxiliary_bytes: None,
+        })
+    }
+
     pub(crate) fn new_with_original_bytes(
         tx_body: TransactionBody,
         raw_body: Vec<u8>,
diff --git a/rust/src/protocol_types/witnesses/fixed_tx_witnesses_set.rs b/rust/src/protocol_types/witnesses/fixed_tx_witnesses_set.rs
index d46a079e..1a3efce3 100644
--- a/rust/src/protocol_types/witnesses/fixed_tx_witnesses_set.rs
+++ b/rust/src/protocol_types/witnesses/fixed_tx_witnesses_set.rs
@@ -30,6 +30,13 @@ impl FixedTxWitnessesSet {
         }
     }
 
+    pub(crate) fn new_empty() -> Self {
+        Self {
+            tx_witnesses_set: TransactionWitnessSet::new(),
+            raw_parts: TransactionWitnessSetRaw::new(),
+        }
+    }
+
     pub fn tx_witnesses_set(&self) -> TransactionWitnessSet {
         self.tx_witnesses_set.clone()
     }
diff --git a/rust/src/tests/builders/tx_builder.rs b/rust/src/tests/builders/tx_builder.rs
index 0aed26d9..6035c607 100644
--- a/rust/src/tests/builders/tx_builder.rs
+++ b/rust/src/tests/builders/tx_builder.rs
@@ -2785,8 +2785,9 @@ fn build_tx_multisig_1on1_signed() {
 
     let mut witness_set = TransactionWitnessSet::new();
     let mut vkw = Vkeywitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("c660e50315d76a53d80732efda7630cae8885dfb85c46378684b3c6103e1284a")
                 .unwrap(),
diff --git a/rust/src/tests/fees.rs b/rust/src/tests/fees.rs
index bc19fb6f..9220a3af 100644
--- a/rust/src/tests/fees.rs
+++ b/rust/src/tests/fees.rs
@@ -40,8 +40,9 @@ fn tx_simple_utxo() {
 
     let mut w = TransactionWitnessSet::new();
     let mut vkw = Vkeywitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("c660e50315d76a53d80732efda7630cae8885dfb85c46378684b3c6103e1284a")
                 .unwrap(),
@@ -95,8 +96,9 @@ fn tx_simple_byron_utxo() {
 
     let mut w = TransactionWitnessSet::new();
     let mut bootstrap_wits = BootstrapWitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     bootstrap_wits.add(&make_icarus_bootstrap_witness(
-            &hash_transaction(&body),
+            &fixed_tx.transaction_hash(),
             &ByronAddress::from_base58("Ae2tdPwUPEZ6r6zbg4ibhFrNnyKHg7SYuPSfDpjKxgvwFX9LquRep7gj7FQ").unwrap(),
             &Bip32PrivateKey::from_bytes(
                 &hex::decode("d84c65426109a36edda5375ea67f1b738e1dacf8629f2bb5a2b0b20f3cd5075873bf5cdfa7e533482677219ac7d639e30a38e2e645ea9140855f44ff09e60c52c8b95d0d35fe75a70f9f5633a3e2439b2994b9e2bc851c49e9f91d1a5dcbb1a3").unwrap()
@@ -173,8 +175,9 @@ fn tx_multi_utxo() {
 
     let mut w = TransactionWitnessSet::new();
     let mut vkw = Vkeywitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("c660e50315d76a53d80732efda7630cae8885dfb85c46378684b3c6103e1284a")
                 .unwrap(),
@@ -182,7 +185,7 @@ fn tx_multi_utxo() {
         .unwrap(),
     ));
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("13fe79205e16c09536acb6f0524d04069f380329d13949698c5f22c65c989eb4")
                 .unwrap(),
@@ -283,9 +286,10 @@ fn tx_register_stake() {
 
     let mut w = TransactionWitnessSet::new();
     let mut vkw = Vkeywitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     // input key witness
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("c660e50315d76a53d80732efda7630cae8885dfb85c46378684b3c6103e1284a")
                 .unwrap(),
@@ -294,7 +298,7 @@ fn tx_register_stake() {
     ));
     // operator key witness
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("2363f3660b9f3b41685665bf10632272e2d03c258e8a5323436f0f3406293505")
                 .unwrap(),
@@ -303,7 +307,7 @@ fn tx_register_stake() {
     ));
     // owner key witness
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("5ada7f4d92bce1ee1707c0a0e211eb7941287356e6ed0e76843806e307b07c8d")
                 .unwrap(),
@@ -504,9 +508,10 @@ fn tx_withdrawal() {
 
     let mut w = TransactionWitnessSet::new();
     let mut vkw = Vkeywitnesses::new();
+    let fixed_tx = FixedTransaction::new_from_body_bytes(&body.to_bytes()).unwrap();
     // input key witness
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("c660e50315d76a53d80732efda7630cae8885dfb85c46378684b3c6103e1284a")
                 .unwrap(),
@@ -515,7 +520,7 @@ fn tx_withdrawal() {
     ));
     // withdrawal key witness
     vkw.add(&make_vkey_witness(
-        &hash_transaction(&body),
+        &fixed_tx.transaction_hash(),
         &PrivateKey::from_normal_bytes(
             &hex::decode("5ada7f4d92bce1ee1707c0a0e211eb7941287356e6ed0e76843806e307b07c8d")
                 .unwrap(),
diff --git a/rust/src/utils.rs b/rust/src/utils.rs
index 2180a6e4..5c761ad2 100644
--- a/rust/src/utils.rs
+++ b/rust/src/utils.rs
@@ -579,11 +579,6 @@ pub fn hash_auxiliary_data(auxiliary_data: &AuxiliaryData) -> AuxiliaryDataHash
     AuxiliaryDataHash::from(blake2b256(&auxiliary_data.to_bytes()))
 }
 
-#[wasm_bindgen]
-pub fn hash_transaction(tx_body: &TransactionBody) -> TransactionHash {
-    TransactionHash::from(crypto::blake2b256(tx_body.to_bytes().as_ref()))
-}
-
 #[wasm_bindgen]
 pub fn hash_plutus_data(plutus_data: &PlutusData) -> DataHash {
     DataHash::from(blake2b256(&plutus_data.to_bytes()))