diff --git a/zebra-chain/src/addresses.rs b/zebra-chain/src/addresses.rs
new file mode 100644
index 00000000..ac30a0d7
--- /dev/null
+++ b/zebra-chain/src/addresses.rs
@@ -0,0 +1,6 @@
+//! Address types.
+
+pub enum TransparentAddress {
+    PayToScriptHash,
+    PayToPublicKeyHash,
+}
diff --git a/zebra-chain/src/keys.rs b/zebra-chain/src/keys.rs
index 470b5f98..3ae225fb 100644
--- a/zebra-chain/src/keys.rs
+++ b/zebra-chain/src/keys.rs
@@ -2,3 +2,4 @@
 
 mod sapling;
 mod sprout;
+mod transparent;
diff --git a/zebra-chain/src/keys/sprout.rs b/zebra-chain/src/keys/sprout.rs
index a7b3f6b0..c6ffe3e4 100644
--- a/zebra-chain/src/keys/sprout.rs
+++ b/zebra-chain/src/keys/sprout.rs
@@ -13,6 +13,6 @@ use crate::serialization::{SerializationError, ZcashDeserialize, ZcashSerialize}
 #[cfg(test)]
 proptest! {
 
-    #[test]
-    fn test() {}
+    // #[test]
+    // fn test() {}
 }
diff --git a/zebra-chain/src/keys/transparent.rs b/zebra-chain/src/keys/transparent.rs
new file mode 100644
index 00000000..4b2c2257
--- /dev/null
+++ b/zebra-chain/src/keys/transparent.rs
@@ -0,0 +1,20 @@
+use std::io;
+
+use secp256k1::PublicKey;
+
+use crate::serialization::{
+    ReadZcashExt, SerializationError, WriteZcashExt, ZcashDeserialize, ZcashSerialize,
+};
+
+impl ZcashSerialize for PublicKey {
+    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), io::Error> {
+        writer.write_all(&self.serialize())?;
+        Ok(())
+    }
+}
+
+impl ZcashDeserialize for PublicKey {
+    fn zcash_deserialize<R: io::Read>(mut _reader: R) -> Result<Self, SerializationError> {
+        unimplemented!();
+    }
+}