diff --git a/zebra-chain/Cargo.toml b/zebra-chain/Cargo.toml
index 7587a6be..bd57dc51 100644
--- a/zebra-chain/Cargo.toml
+++ b/zebra-chain/Cargo.toml
@@ -10,4 +10,5 @@ edition = "2018"
 byteorder = "1.3"
 chrono = "0.4"
 failure = "0.1"
+#hex = "0.4" This conflicts with tracing-subscriber?
 sha2 = "0.8"
diff --git a/zebra-chain/src/block.rs b/zebra-chain/src/block.rs
index 1619f6d3..ec8ce631 100644
--- a/zebra-chain/src/block.rs
+++ b/zebra-chain/src/block.rs
@@ -114,3 +114,15 @@ pub struct Block {
     /// The block transactions.
     pub transactions: Vec<Transaction>,
 }
+
+impl ZcashSerialize for Block {
+    fn zcash_serialize<W: io::Write>(&self, writer: W) -> Result<(), SerializationError> {
+        unimplemented!();
+    }
+}
+
+impl ZcashDeserialize for Block {
+    fn zcash_deserialize<R: io::Read>(reader: R) -> Result<Self, SerializationError> {
+        unimplemented!();
+    }
+}
diff --git a/zebra-chain/src/lib.rs b/zebra-chain/src/lib.rs
index dabff5b2..ac407ede 100644
--- a/zebra-chain/src/lib.rs
+++ b/zebra-chain/src/lib.rs
@@ -8,6 +8,7 @@ mod merkle_tree;
 mod sha256d_writer;
 
 pub mod block;
+pub mod equihash_solution;
 pub mod note_commitment_tree;
 pub mod serialization;
 pub mod transaction;