node-data: rename hash to digest

- Update comments

node-data/src/ledger/faults.rs

@@ -81,8 +81,8 @@ impl From<BlsSigError> for InvalidFault {
 }
 
 impl Fault {
-    /// Hash the serialized form
-    pub fn hash(&self) -> [u8; 32] {
+    /// Digest the serialized form
+    pub fn digest(&self) -> [u8; 32] {
         let mut b = vec![];
         self.write(&mut b).expect("Write to a vec shall not fail");
         sha3::Sha3_256::digest(&b[..]).into()

node-data/src/ledger/transaction.rs

@@ -55,14 +55,16 @@ pub struct SpentTransaction {
 }
 
 impl Transaction {
-    /// Computes the hash of the transaction.
+    /// Computes the hash digest of the entire transaction data.
     ///
-    /// This method returns the hash of the entire
+    /// This method returns the Sha3 256 digest of the entire
     /// transaction in its serialized form
     ///
+    /// The digest hash is currently only being used in the merkle tree.
+    ///
     /// ### Returns
     /// An array of 32 bytes representing the hash of the transaction.
-    pub fn hash(&self) -> [u8; 32] {
+    pub fn digest(&self) -> [u8; 32] {
         sha3::Sha3_256::digest(self.inner.to_var_bytes()).into()
     }