diff --git a/zcash_client_backend/src/data_api.rs b/zcash_client_backend/src/data_api.rs
index 361a95d32..4f2e2efa9 100644
--- a/zcash_client_backend/src/data_api.rs
+++ b/zcash_client_backend/src/data_api.rs
@@ -165,16 +165,16 @@ pub trait WalletRead {
     /// with which they are associated.
     fn get_nullifiers(&self) -> Result<Vec<(AccountId, Nullifier)>, Self::Error>;
 
-    /// Return all spendable notes.
-    fn get_spendable_sapling_notes(
+    /// Return all unspent notes.
+    fn get_unspent_sapling_notes(
         &self,
         account: AccountId,
         anchor_height: BlockHeight,
     ) -> Result<Vec<SpendableNote>, Self::Error>;
 
-    /// Returns a list of spendable notes sufficient to cover the specified
+    /// Returns a list of unspent notes sufficient to cover the specified
     /// target value, if possible.
-    fn select_spendable_sapling_notes(
+    fn select_unspent_sapling_notes(
         &self,
         account: AccountId,
         target_value: Amount,
@@ -182,7 +182,7 @@ pub trait WalletRead {
     ) -> Result<Vec<SpendableNote>, Self::Error>;
 
     #[cfg(feature = "transparent-inputs")]
-    fn get_spendable_transparent_utxos(
+    fn get_unspent_transparent_utxos(
         &self,
         address: &TransparentAddress,
         anchor_height: BlockHeight,
@@ -395,7 +395,7 @@ pub mod testing {
             Ok(Vec::new())
         }
 
-        fn get_spendable_sapling_notes(
+        fn get_unspent_sapling_notes(
             &self,
             _account: AccountId,
             _anchor_height: BlockHeight,
@@ -403,7 +403,7 @@ pub mod testing {
             Ok(Vec::new())
         }
 
-        fn select_spendable_sapling_notes(
+        fn select_unspent_sapling_notes(
             &self,
             _account: AccountId,
             _target_value: Amount,
@@ -413,7 +413,7 @@ pub mod testing {
         }
 
         #[cfg(feature = "transparent-inputs")]
-        fn get_spendable_transparent_utxos(
+        fn get_unspent_transparent_utxos(
             &self,
             _address: &TransparentAddress,
             _anchor_height: BlockHeight,
diff --git a/zcash_client_backend/src/data_api/wallet.rs b/zcash_client_backend/src/data_api/wallet.rs
index 3632f336c..226887cc0 100644
--- a/zcash_client_backend/src/data_api/wallet.rs
+++ b/zcash_client_backend/src/data_api/wallet.rs
@@ -191,7 +191,7 @@ where
 
     let target_value = value + DEFAULT_FEE;
     let spendable_notes =
-        wallet_db.select_spendable_sapling_notes(account, target_value, anchor_height)?;
+        wallet_db.select_unspent_sapling_notes(account, target_value, anchor_height)?;
 
     // Confirm we were able to select sufficient value
     let selected_value = spendable_notes.iter().map(|n| n.note_value).sum();
@@ -296,7 +296,7 @@ where
     let ovk = exfvk.fvk.ovk;
 
     // get UTXOs from DB
-    let utxos = wallet_db.get_spendable_transparent_utxos(&taddr, latest_anchor)?;
+    let utxos = wallet_db.get_unspent_transparent_utxos(&taddr, latest_anchor)?;
     let total_amount = utxos.iter().map(|utxo| utxo.value).sum::<Amount>();
 
     let fee = DEFAULT_FEE;
diff --git a/zcash_client_backend/src/keys.rs b/zcash_client_backend/src/keys.rs
index 502801945..d6def4070 100644
--- a/zcash_client_backend/src/keys.rs
+++ b/zcash_client_backend/src/keys.rs
@@ -75,6 +75,7 @@ pub fn derive_secret_key_from_seed<P: consensus::Parameters>(
 }
 
 #[cfg(feature = "transparent-inputs")]
+#[derive(Clone, Debug, Eq, PartialEq)]
 pub struct Wif(pub String);
 
 #[cfg(feature = "transparent-inputs")]
@@ -94,7 +95,7 @@ impl Wif {
 }
 
 #[cfg(feature = "transparent-inputs")]
-impl TryInto<SecretKey> for Wif {
+impl<'a> TryInto<SecretKey> for &'a Wif {
     type Error = Bs58Error;
 
     fn try_into(self) -> Result<SecretKey, Self::Error> {
@@ -153,7 +154,7 @@ mod tests {
     #[test]
     fn sk_wif_to_taddr() {
         let sk_wif = Wif("L4BvDC33yLjMRxipZvdiUmdYeRfZmR8viziwsVwe72zJdGbiJPv2".to_string());
-        let sk: SecretKey = sk_wif.try_into().expect("invalid wif");
+        let sk: SecretKey = (&sk_wif).try_into().expect("invalid wif");
         let taddr = derive_transparent_address_from_secret_key(sk);
         assert_eq!(
             taddr.encode(&MAIN_NETWORK),
diff --git a/zcash_client_sqlite/src/lib.rs b/zcash_client_sqlite/src/lib.rs
index daddcba8e..961953a8f 100644
--- a/zcash_client_sqlite/src/lib.rs
+++ b/zcash_client_sqlite/src/lib.rs
@@ -263,35 +263,30 @@ impl<P: consensus::Parameters> WalletRead for WalletDb<P> {
         wallet::get_nullifiers(&self)
     }
 
-    fn get_spendable_sapling_notes(
+    fn get_unspent_sapling_notes(
         &self,
         account: AccountId,
         anchor_height: BlockHeight,
     ) -> Result<Vec<SpendableNote>, Self::Error> {
-        wallet::transact::get_spendable_sapling_notes(&self, account, anchor_height)
+        wallet::transact::get_unspent_sapling_notes(&self, account, anchor_height)
     }
 
-    fn select_spendable_sapling_notes(
+    fn select_unspent_sapling_notes(
         &self,
         account: AccountId,
         target_value: Amount,
         anchor_height: BlockHeight,
     ) -> Result<Vec<SpendableNote>, Self::Error> {
-        wallet::transact::select_spendable_sapling_notes(
-            &self,
-            account,
-            target_value,
-            anchor_height,
-        )
+        wallet::transact::select_unspent_sapling_notes(&self, account, target_value, anchor_height)
     }
 
     #[cfg(feature = "transparent-inputs")]
-    fn get_spendable_transparent_utxos(
+    fn get_unspent_transparent_utxos(
         &self,
         address: &TransparentAddress,
         anchor_height: BlockHeight,
     ) -> Result<Vec<WalletTransparentOutput>, Self::Error> {
-        wallet::get_spendable_transparent_utxos(&self, address, anchor_height)
+        wallet::get_unspent_transparent_utxos(&self, address, anchor_height)
     }
 }
 
@@ -396,33 +391,33 @@ impl<'a, P: consensus::Parameters> WalletRead for DataConnStmtCache<'a, P> {
         self.wallet_db.get_nullifiers()
     }
 
-    fn get_spendable_sapling_notes(
+    fn get_unspent_sapling_notes(
         &self,
         account: AccountId,
         anchor_height: BlockHeight,
     ) -> Result<Vec<SpendableNote>, Self::Error> {
         self.wallet_db
-            .get_spendable_sapling_notes(account, anchor_height)
+            .get_unspent_sapling_notes(account, anchor_height)
     }
 
-    fn select_spendable_sapling_notes(
+    fn select_unspent_sapling_notes(
         &self,
         account: AccountId,
         target_value: Amount,
         anchor_height: BlockHeight,
     ) -> Result<Vec<SpendableNote>, Self::Error> {
         self.wallet_db
-            .select_spendable_sapling_notes(account, target_value, anchor_height)
+            .select_unspent_sapling_notes(account, target_value, anchor_height)
     }
 
     #[cfg(feature = "transparent-inputs")]
-    fn get_spendable_transparent_utxos(
+    fn get_unspent_transparent_utxos(
         &self,
         address: &TransparentAddress,
         anchor_height: BlockHeight,
     ) -> Result<Vec<WalletTransparentOutput>, Self::Error> {
         self.wallet_db
-            .get_spendable_transparent_utxos(address, anchor_height)
+            .get_unspent_transparent_utxos(address, anchor_height)
     }
 }
 
diff --git a/zcash_client_sqlite/src/wallet.rs b/zcash_client_sqlite/src/wallet.rs
index f95c6d426..0234f267f 100644
--- a/zcash_client_sqlite/src/wallet.rs
+++ b/zcash_client_sqlite/src/wallet.rs
@@ -599,7 +599,7 @@ pub fn get_nullifiers<P>(
 }
 
 #[cfg(feature = "transparent-inputs")]
-pub fn get_spendable_transparent_utxos<P: consensus::Parameters>(
+pub fn get_unspent_transparent_utxos<P: consensus::Parameters>(
     wdb: &WalletDb<P>,
     address: &TransparentAddress,
     anchor_height: BlockHeight,
diff --git a/zcash_client_sqlite/src/wallet/transact.rs b/zcash_client_sqlite/src/wallet/transact.rs
index 35ed92f0c..db313c73f 100644
--- a/zcash_client_sqlite/src/wallet/transact.rs
+++ b/zcash_client_sqlite/src/wallet/transact.rs
@@ -59,7 +59,7 @@ fn to_spendable_note(row: &Row) -> Result<SpendableNote, SqliteClientError> {
     })
 }
 
-pub fn get_spendable_sapling_notes<P>(
+pub fn get_unspent_sapling_notes<P>(
     wdb: &WalletDb<P>,
     account: AccountId,
     anchor_height: BlockHeight,
@@ -87,7 +87,7 @@ pub fn get_spendable_sapling_notes<P>(
     notes.collect::<Result<_, _>>()
 }
 
-pub fn select_spendable_sapling_notes<P>(
+pub fn select_unspent_sapling_notes<P>(
     wdb: &WalletDb<P>,
     account: AccountId,
     target_value: Amount,