diff --git a/zebra-chain/src/addresses/sapling.rs b/zebra-chain/src/addresses/sapling.rs
index 28fc77bb1..08f8054fb 100644
--- a/zebra-chain/src/addresses/sapling.rs
+++ b/zebra-chain/src/addresses/sapling.rs
@@ -144,7 +144,7 @@ mod tests {
         let authorizing_key = sapling::AuthorizingKey::from(spend_authorizing_key);
         let nullifier_deriving_key = sapling::NullifierDerivingKey::from(proof_authorizing_key);
         let incoming_viewing_key =
-            sapling::IncomingViewingKey::from_keys(authorizing_key, nullifier_deriving_key);
+            sapling::IncomingViewingKey::from((authorizing_key, nullifier_deriving_key));
 
         let diversifier = sapling::Diversifier::new(&mut OsRng);
         let transmission_key = sapling::TransmissionKey::from(incoming_viewing_key, diversifier);
diff --git a/zebra-chain/src/keys/sapling.rs b/zebra-chain/src/keys/sapling.rs
index b587041df..7dcf81ed3 100644
--- a/zebra-chain/src/keys/sapling.rs
+++ b/zebra-chain/src/keys/sapling.rs
@@ -514,6 +514,25 @@ impl From<[u8; 32]> for IncomingViewingKey {
     }
 }
 
+impl From<(AuthorizingKey, NullifierDerivingKey)> for IncomingViewingKey {
+    /// For this invocation of Blake2s-256 as _CRH^ivk_.
+    ///
+    /// https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
+    /// https://zips.z.cash/protocol/protocol.pdf#concreteprfs
+    /// https://zips.z.cash/protocol/protocol.pdf#jubjub
+    // TODO: return None if ivk = 0
+    //
+    // "If ivk = 0, discard this key and start over with a new
+    // [spending key]." - [§4.2.2][ps]
+    //
+    // [ps]: https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
+    fn from((ask, nk): (AuthorizingKey, NullifierDerivingKey)) -> Self {
+        let hash_bytes = crh_ivk(ask.into(), nk.to_bytes());
+
+        IncomingViewingKey::from(hash_bytes)
+    }
+}
+
 impl From<IncomingViewingKey> for [u8; 32] {
     fn from(ivk: IncomingViewingKey) -> [u8; 32] {
         ivk.scalar.to_bytes()
@@ -563,30 +582,6 @@ impl std::str::FromStr for IncomingViewingKey {
     }
 }
 
-impl IncomingViewingKey {
-    /// For this invocation of Blake2s-256 as _CRH^ivk_.
-    ///
-    /// https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
-    /// https://zips.z.cash/protocol/protocol.pdf#concreteprfs
-    /// https://zips.z.cash/protocol/protocol.pdf#jubjub
-    // TODO: return None if ivk = 0
-    //
-    // "If ivk = 0, discard this key and start over with a new
-    // [spending key]." - [§4.2.2][ps]
-    //
-    // [ps]: https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
-    //
-    // TODO: won't let me name this `from(arg1, arg2)` when I have From impl'd above?
-    pub fn from_keys(
-        authorizing_key: AuthorizingKey,
-        nullifier_deriving_key: NullifierDerivingKey,
-    ) -> Self {
-        let hash_bytes = crh_ivk(authorizing_key.into(), nullifier_deriving_key.to_bytes());
-
-        IncomingViewingKey::from(hash_bytes)
-    }
-}
-
 /// A _Diversifier_, as described in [protocol specification §4.2.2][ps].
 ///
 /// Combined with an _IncomingViewingKey_, produces a _diversified
diff --git a/zebra-chain/src/keys/sapling/tests.rs b/zebra-chain/src/keys/sapling/tests.rs
index 3468b8523..640d7ed0b 100644
--- a/zebra-chain/src/keys/sapling/tests.rs
+++ b/zebra-chain/src/keys/sapling/tests.rs
@@ -1,7 +1,5 @@
 #[cfg(test)]
 use proptest::{array, prelude::*};
-#[cfg(test)]
-use proptest_derive::Arbitrary;
 
 use super::*;
 
@@ -45,7 +43,7 @@ mod tests {
         // [spending key]."
         // https://zips.z.cash/protocol/protocol.pdf#saplingkeycomponents
         let incoming_viewing_key =
-            IncomingViewingKey::from_keys(authorizing_key, nullifier_deriving_key);
+            IncomingViewingKey::from((authorizing_key, nullifier_deriving_key));
 
         let diversifier = Diversifier::new(&mut OsRng);
         let _transmission_key = TransmissionKey::from(incoming_viewing_key, diversifier);
@@ -81,7 +79,7 @@ mod tests {
                 test_vector.nk
             );
             let incoming_viewing_key =
-                IncomingViewingKey::from_keys(authorizing_key, nullifier_deriving_key);
+                IncomingViewingKey::from((authorizing_key, nullifier_deriving_key));
             assert_eq!(incoming_viewing_key.scalar.to_bytes(), test_vector.ivk);
 
             // TODO: replace with _DefaultDiversifier_ with spending