diff --git a/zcash_client_backend/src/constants/mainnet.rs b/zcash_client_backend/src/constants/mainnet.rs
index 2ae096a..9da1f58 100644
--- a/zcash_client_backend/src/constants/mainnet.rs
+++ b/zcash_client_backend/src/constants/mainnet.rs
@@ -25,7 +25,7 @@ pub const HRP_SAPLING_EXTENDED_FULL_VIEWING_KEY: &str = "zxviews";
 ///
 /// [`PaymentAddress`]: sapling_crypto::primitives::PaymentAddress
 /// [Zcash Protocol Specification]: https://github.com/zcash/zips/blob/master/protocol/protocol.pdf
-pub const HRP_SAPLING_PAYMENT_ADDRESS: &str = "zs";
+pub const HRP_SAPLING_PAYMENT_ADDRESS: &str = "zs1";
 
 /// The prefix for a Base58Check-encoded mainnet [`TransparentAddress::PublicKey`].
 ///
diff --git a/zcash_client_backend/src/encoding.rs b/zcash_client_backend/src/encoding.rs
index 44ca053..0bd1644 100644
--- a/zcash_client_backend/src/encoding.rs
+++ b/zcash_client_backend/src/encoding.rs
@@ -220,13 +220,13 @@ pub fn encode_transparent_address(
 ) -> String {
     let decoded = match addr {
         TransparentAddress::PublicKey(key_id) => {
-            let mut decoded = vec![0; pubkey_version.len() + 21];
+            let mut decoded = vec![0; pubkey_version.len() + 20];
             decoded[..pubkey_version.len()].copy_from_slice(pubkey_version);
             decoded[pubkey_version.len()..].copy_from_slice(key_id);
             decoded
         }
         TransparentAddress::Script(script_id) => {
-            let mut decoded = vec![0; script_version.len() + 21];
+            let mut decoded = vec![0; script_version.len() + 20];
             decoded[..script_version.len()].copy_from_slice(script_version);
             decoded[script_version.len()..].copy_from_slice(script_id);
             decoded