diff --git a/zebra-chain/src/addresses/transparent.rs b/zebra-chain/src/addresses/transparent.rs
index f6e227209..36dfee207 100644
--- a/zebra-chain/src/addresses/transparent.rs
+++ b/zebra-chain/src/addresses/transparent.rs
@@ -11,8 +11,8 @@ use proptest::{arbitrary::Arbitrary, collection::vec, prelude::*};
 
 use crate::{
     parameters::Network,
+    primitives::Script,
     serialization::{SerializationError, ZcashDeserialize, ZcashSerialize},
-    types::Script,
 };
 
 /// Magic numbers used to identify what networks Transparent Addresses
@@ -247,8 +247,6 @@ mod tests {
 
     use secp256k1::PublicKey;
 
-    use crate::types::Script;
-
     use super::*;
 
     #[test]
diff --git a/zebra-chain/src/keys/sapling.rs b/zebra-chain/src/keys/sapling.rs
index 7c12c8a9b..aa177e376 100644
--- a/zebra-chain/src/keys/sapling.rs
+++ b/zebra-chain/src/keys/sapling.rs
@@ -31,7 +31,7 @@ use proptest_derive::Arbitrary;
 
 use crate::{
     parameters::Network,
-    redjubjub::{self, SpendAuth},
+    primitives::redjubjub::{self, SpendAuth},
     serialization::{
         serde_helpers, ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize,
     },
diff --git a/zebra-chain/src/lib.rs b/zebra-chain/src/lib.rs
index 0e678995c..981eb6723 100644
--- a/zebra-chain/src/lib.rs
+++ b/zebra-chain/src/lib.rs
@@ -20,12 +20,9 @@ pub mod commitments;
 pub mod keys;
 pub mod notes;
 pub mod parameters;
-pub mod proofs;
+pub mod primitives;
 pub mod serialization;
 pub mod transaction;
 pub mod treestate;
 pub mod types;
 pub mod work;
-
-pub use ed25519_zebra;
-pub use redjubjub;
diff --git a/zebra-chain/src/primitives.rs b/zebra-chain/src/primitives.rs
new file mode 100644
index 000000000..6838dd003
--- /dev/null
+++ b/zebra-chain/src/primitives.rs
@@ -0,0 +1,15 @@
+//! Primitives used in Zcash structures.
+//!
+//! This contains re-exports of libraries used in the public API, as well as stub
+//! definitions of primitive types which must be represented in this library but
+//! whose functionality is implemented elsewhere.
+
+mod proofs;
+mod script;
+
+pub use ed25519_zebra as ed25519;
+pub use redjubjub;
+pub use x25519_dalek as x25519;
+
+pub use proofs::{Bctv14Proof, Groth16Proof, ZkSnarkProof};
+pub use script::Script;
diff --git a/zebra-chain/src/proofs.rs b/zebra-chain/src/primitives/proofs.rs
similarity index 100%
rename from zebra-chain/src/proofs.rs
rename to zebra-chain/src/primitives/proofs.rs
diff --git a/zebra-chain/src/proofs/bctv14.rs b/zebra-chain/src/primitives/proofs/bctv14.rs
similarity index 100%
rename from zebra-chain/src/proofs/bctv14.rs
rename to zebra-chain/src/primitives/proofs/bctv14.rs
diff --git a/zebra-chain/src/proofs/groth16.rs b/zebra-chain/src/primitives/proofs/groth16.rs
similarity index 100%
rename from zebra-chain/src/proofs/groth16.rs
rename to zebra-chain/src/primitives/proofs/groth16.rs
diff --git a/zebra-chain/src/primitives/script.rs b/zebra-chain/src/primitives/script.rs
new file mode 100644
index 000000000..75d09e5f0
--- /dev/null
+++ b/zebra-chain/src/primitives/script.rs
@@ -0,0 +1,62 @@
+#![allow(clippy::unit_arg)]
+use crate::serialization::{
+    ReadZcashExt, SerializationError, WriteZcashExt, ZcashDeserialize, ZcashSerialize,
+};
+use std::{
+    fmt,
+    io::{self, Read},
+};
+
+/// An encoding of a Bitcoin script.
+#[derive(Clone, Eq, PartialEq, Serialize, Deserialize)]
+#[cfg_attr(test, derive(proptest_derive::Arbitrary))]
+pub struct Script(pub Vec<u8>);
+
+impl fmt::Debug for Script {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("Script")
+            .field(&hex::encode(&self.0))
+            .finish()
+    }
+}
+
+impl ZcashSerialize for Script {
+    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), io::Error> {
+        writer.write_compactsize(self.0.len() as u64)?;
+        writer.write_all(&self.0[..])?;
+        Ok(())
+    }
+}
+
+impl ZcashDeserialize for Script {
+    fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
+        // XXX what is the max length of a script?
+        let len = reader.read_compactsize()?;
+        let mut bytes = Vec::new();
+        reader.take(len).read_to_end(&mut bytes)?;
+        Ok(Script(bytes))
+    }
+}
+
+#[cfg(test)]
+mod proptests {
+    use std::io::Cursor;
+
+    use proptest::prelude::*;
+
+    use super::*;
+    use crate::serialization::{ZcashDeserialize, ZcashSerialize};
+
+    proptest! {
+        #[test]
+        fn script_roundtrip(script in any::<Script>()) {
+            let mut bytes = Cursor::new(Vec::new());
+            script.zcash_serialize(&mut bytes)?;
+
+            bytes.set_position(0);
+            let other_script = Script::zcash_deserialize(&mut bytes)?;
+
+            prop_assert_eq![script, other_script];
+        }
+    }
+}
diff --git a/zebra-chain/src/transaction.rs b/zebra-chain/src/transaction.rs
index ea400c3f8..41d743fb5 100644
--- a/zebra-chain/src/transaction.rs
+++ b/zebra-chain/src/transaction.rs
@@ -20,7 +20,7 @@ pub use transparent::{CoinbaseData, OutPoint, TransparentInput, TransparentOutpu
 
 use crate::amount::Amount;
 use crate::block::BlockHeight;
-use crate::proofs::{Bctv14Proof, Groth16Proof};
+use crate::primitives::{Bctv14Proof, Groth16Proof};
 
 /// A Zcash transaction.
 ///
diff --git a/zebra-chain/src/transaction/joinsplit.rs b/zebra-chain/src/transaction/joinsplit.rs
index ea5232791..bd474778b 100644
--- a/zebra-chain/src/transaction/joinsplit.rs
+++ b/zebra-chain/src/transaction/joinsplit.rs
@@ -2,9 +2,8 @@ use serde::{Deserialize, Serialize};
 
 use crate::{
     amount::{Amount, NonNegative},
-    ed25519_zebra,
     notes::sprout,
-    proofs::ZkSnarkProof,
+    primitives::{ed25519, x25519, ZkSnarkProof},
     treestate,
 };
 
@@ -29,15 +28,15 @@ pub struct JoinSplit<P: ZkSnarkProof> {
     /// A note commitment for this output note.
     pub commitments: [crate::commitments::sprout::NoteCommitment; 2],
     /// An X25519 public key.
-    pub ephemeral_key: x25519_dalek::PublicKey,
+    pub ephemeral_key: x25519::PublicKey,
     /// A 256-bit seed that must be chosen independently at random for each
     /// JoinSplit description.
     pub random_seed: [u8; 32],
     /// A message authentication tag.
     pub vmacs: [crate::types::MAC; 2],
     /// A ZK JoinSplit proof, either a
-    /// [`Groth16Proof`](crate::proofs::Groth16Proof) or a
-    /// [`Bctv14Proof`](crate::proofs::Bctv14Proof).
+    /// [`Groth16Proof`](crate::primitives::Groth16Proof) or a
+    /// [`Bctv14Proof`](crate::primitives::Bctv14Proof).
     #[serde(bound(serialize = "P: ZkSnarkProof", deserialize = "P: ZkSnarkProof"))]
     pub zkproof: P,
     /// A ciphertext component for this output note.
@@ -89,9 +88,9 @@ pub struct JoinSplitData<P: ZkSnarkProof> {
     ))]
     pub rest: Vec<JoinSplit<P>>,
     /// The public key for the JoinSplit signature.
-    pub pub_key: ed25519_zebra::VerificationKeyBytes,
+    pub pub_key: ed25519::VerificationKeyBytes,
     /// The JoinSplit signature.
-    pub sig: ed25519_zebra::Signature,
+    pub sig: ed25519::Signature,
 }
 
 impl<P: ZkSnarkProof> JoinSplitData<P> {
diff --git a/zebra-chain/src/transaction/serialize.rs b/zebra-chain/src/transaction/serialize.rs
index f597b19c0..ab7c02320 100644
--- a/zebra-chain/src/transaction/serialize.rs
+++ b/zebra-chain/src/transaction/serialize.rs
@@ -10,7 +10,7 @@ use std::{
 
 use crate::{
     commitments, keys, notes,
-    proofs::ZkSnarkProof,
+    primitives::{Script, ZkSnarkProof},
     serialization::{
         ReadZcashExt, SerializationError, WriteZcashExt, ZcashDeserialize, ZcashSerialize,
     },
@@ -227,7 +227,7 @@ impl ZcashDeserialize for TransparentInput {
                     hash: TransactionHash(bytes),
                     index: reader.read_u32::<LittleEndian>()?,
                 },
-                unlock_script: types::Script::zcash_deserialize(&mut reader)?,
+                unlock_script: Script::zcash_deserialize(&mut reader)?,
                 sequence: reader.read_u32::<LittleEndian>()?,
             })
         }
@@ -246,7 +246,7 @@ impl ZcashDeserialize for TransparentOutput {
     fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
         Ok(TransparentOutput {
             value: reader.read_u64::<LittleEndian>()?.try_into()?,
-            lock_script: types::Script::zcash_deserialize(&mut reader)?,
+            lock_script: Script::zcash_deserialize(&mut reader)?,
         })
     }
 }
diff --git a/zebra-chain/src/transaction/shielded_data.rs b/zebra-chain/src/transaction/shielded_data.rs
index 90f9ac131..a9ea19d3a 100644
--- a/zebra-chain/src/transaction/shielded_data.rs
+++ b/zebra-chain/src/transaction/shielded_data.rs
@@ -1,7 +1,9 @@
 use crate::{
     commitments, keys, notes,
-    proofs::Groth16Proof,
-    redjubjub::{self, Binding, SpendAuth},
+    primitives::{
+        redjubjub::{self, Binding, SpendAuth},
+        Groth16Proof,
+    },
     serialization::serde_helpers,
     treestate::note_commitment_tree::SaplingNoteTreeRootHash,
 };
diff --git a/zebra-chain/src/transaction/tests/arbitrary.rs b/zebra-chain/src/transaction/tests/arbitrary.rs
index b6f2f518f..ed3417bbd 100644
--- a/zebra-chain/src/transaction/tests/arbitrary.rs
+++ b/zebra-chain/src/transaction/tests/arbitrary.rs
@@ -7,13 +7,12 @@ use crate::{
     block::BlockHeight,
     commitments, keys,
     notes::{sapling, sprout},
-    proofs::{Bctv14Proof, Groth16Proof, ZkSnarkProof},
+    primitives::{Bctv14Proof, Groth16Proof, Script, ZkSnarkProof},
     transaction::{
         CoinbaseData, JoinSplit, JoinSplitData, LockTime, OutPoint, Output, ShieldedData, Spend,
         Transaction, TransparentInput, TransparentOutput,
     },
     treestate::{self, note_commitment_tree::SaplingNoteTreeRootHash},
-    types::Script,
 };
 
 impl Transaction {
diff --git a/zebra-chain/src/transaction/transparent.rs b/zebra-chain/src/transaction/transparent.rs
index f65fd456f..0e2737c86 100644
--- a/zebra-chain/src/transaction/transparent.rs
+++ b/zebra-chain/src/transaction/transparent.rs
@@ -7,7 +7,7 @@ use proptest_derive::Arbitrary;
 use crate::{
     amount::{Amount, NonNegative},
     block::BlockHeight,
-    types::Script,
+    primitives::Script,
 };
 
 use super::TransactionHash;
diff --git a/zebra-chain/src/types.rs b/zebra-chain/src/types.rs
index ea40182fc..a006f6464 100644
--- a/zebra-chain/src/types.rs
+++ b/zebra-chain/src/types.rs
@@ -1,12 +1,7 @@
 //! Newtype wrappers for primitive data types with semantic meaning.
 #![allow(clippy::unit_arg)]
-use crate::serialization::{
-    ReadZcashExt, SerializationError, WriteZcashExt, ZcashDeserialize, ZcashSerialize,
-};
-use std::{
-    fmt,
-    io::{self, Read},
-};
+use crate::serialization::{ReadZcashExt, SerializationError, ZcashDeserialize, ZcashSerialize};
+use std::io::{self, Read};
 
 /// A sequence of message authentication tags ...
 ///
@@ -29,56 +24,3 @@ impl ZcashSerialize for MAC {
         writer.write_all(&self.0[..])
     }
 }
-/// An encoding of a Bitcoin script.
-#[derive(Clone, Eq, PartialEq, Serialize, Deserialize)]
-#[cfg_attr(test, derive(proptest_derive::Arbitrary))]
-pub struct Script(pub Vec<u8>);
-
-impl fmt::Debug for Script {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_tuple("Script")
-            .field(&hex::encode(&self.0))
-            .finish()
-    }
-}
-
-impl ZcashSerialize for Script {
-    fn zcash_serialize<W: io::Write>(&self, mut writer: W) -> Result<(), io::Error> {
-        writer.write_compactsize(self.0.len() as u64)?;
-        writer.write_all(&self.0[..])?;
-        Ok(())
-    }
-}
-
-impl ZcashDeserialize for Script {
-    fn zcash_deserialize<R: io::Read>(mut reader: R) -> Result<Self, SerializationError> {
-        // XXX what is the max length of a script?
-        let len = reader.read_compactsize()?;
-        let mut bytes = Vec::new();
-        reader.take(len).read_to_end(&mut bytes)?;
-        Ok(Script(bytes))
-    }
-}
-
-#[cfg(test)]
-mod proptests {
-    use std::io::Cursor;
-
-    use proptest::prelude::*;
-
-    use super::*;
-    use crate::serialization::{ZcashDeserialize, ZcashSerialize};
-
-    proptest! {
-        #[test]
-        fn script_roundtrip(script in any::<Script>()) {
-            let mut bytes = Cursor::new(Vec::new());
-            script.zcash_serialize(&mut bytes)?;
-
-            bytes.set_position(0);
-            let other_script = Script::zcash_deserialize(&mut bytes)?;
-
-            prop_assert_eq![script, other_script];
-        }
-    }
-}