diff --git a/librustzcash-wrapper/Cargo.toml b/librustzcash-wrapper/Cargo.toml
index 5d1340c..55744d5 100644
--- a/librustzcash-wrapper/Cargo.toml
+++ b/librustzcash-wrapper/Cargo.toml
@@ -14,7 +14,7 @@ borsh = "0.10"
 bech32 = "0.9.1"
 orchard = "0.4.0"
 zcash_note_encryption = "0.3.0"
-zcash_primitives = "0.12.0"
+zcash_primitives = "0.11.0"
 zcash_client_backend = "0.9.0"
 
 [features]
diff --git a/librustzcash-wrapper/src/lib.rs b/librustzcash-wrapper/src/lib.rs
index 93a1245..12f68cc 100644
--- a/librustzcash-wrapper/src/lib.rs
+++ b/librustzcash-wrapper/src/lib.rs
@@ -16,7 +16,10 @@ use haskell_ffi::{
     FromHaskell, HaskellSize, ToHaskell
 };
 
-use zcash_primitives::{sapling::keys::FullViewingKey as SaplingViewingKey, zip32::DiversifiableFullViewingKey};
+use zcash_primitives:: sapling::{
+    keys::FullViewingKey as SaplingViewingKey,
+    PaymentAddress
+};
 
 use zcash_address::{
     Network,
@@ -195,7 +198,6 @@ pub extern "C" fn rust_wrapper_bech32decode(
     out_len: &mut usize
     ) {
     let input: String = marshall_from_haskell_var(input, input_len, RW);
-    let (hrp, bytes, variant) = bech32::decode(&input).unwrap();
     let decodedBytes = bech32::decode(&input);
     match decodedBytes {
         Ok((hrp, bytes, variant)) => {
@@ -227,6 +229,28 @@ pub extern "C" fn rust_wrapper_svk_decode(
     }
 }
 
+#[no_mangle]
+pub extern "C" fn rust_wrapper_svk_check_address(
+    key_input: *const u8,
+    key_input_len: usize,
+    address_input: *const u8,
+    address_input_len: usize
+    ) -> bool {
+    let key_input: Vec<u8> = marshall_from_haskell_var(key_input, key_input_len, RW);
+    let address_input: Vec<u8> = marshall_from_haskell_var(address_input, address_input_len, RW);
+    let svk = ExtendedFullViewingKey::read(&*key_input);
+    let sa = PaymentAddress::from_bytes(&to_array(address_input)).unwrap();
+    match svk {
+        Ok(k) => {
+            let (div_index, def_address) = k.default_address();
+            sa == def_address
+        }
+        Err(e) => {
+            false
+        }
+    }
+}
+
 #[no_mangle]
 pub extern "C" fn rust_wrapper_ufvk_decode(
     input: *const u8,