diff --git a/mine-your-first-block/src/utils.rs b/mine-your-first-block/src/utils.rs
index ce293f2..e4332b7 100644
--- a/mine-your-first-block/src/utils.rs
+++ b/mine-your-first-block/src/utils.rs
@@ -567,3 +567,16 @@ pub fn reverse_bytes(mut bytes: Vec<u8>) -> String {
     bytes.reverse();
     hex::encode(bytes)
 }
+
+pub fn calculate_transaction_weight(tx: &Transaction) -> u64 {
+    // Serialized tx size without witness
+    let base_size = serialize_tx(tx).len() as u64;
+
+    // Serialized tx size with witness
+    let total_size = serialized_segwit_tx(tx).len() as u64;
+
+    // Calculate weight of the transaction
+    let tx_weight = base_size * 3 + total_size;
+
+    tx_weight   // Return the weight of the transaction
+}
diff --git a/mine-your-first-block/src/validation.rs b/mine-your-first-block/src/validation.rs
index 0d6fbd0..1415d87 100644
--- a/mine-your-first-block/src/validation.rs
+++ b/mine-your-first-block/src/validation.rs
@@ -429,16 +429,4 @@ pub fn hash_meets_difficulty_target(hash: &str) -> bool {
     hash_as_num < target
 }
 
-pub fn calculate_transaction_weight(tx: &Transaction) -> u64 {
-    // Serialized tx size without witness
-    let base_size = serialize_tx(tx).len() as u64;
-
-    // Serialized tx size with witness
-    let total_size = serialized_segwit_tx(tx).len() as u64;
-
-    // Calculate weight of the transaction
-    let tx_weight = base_size * 3 + total_size;
-
-    tx_weight   // Return the weight of the transaction
-}