diff --git a/beacon_chain/validation/src/message_generation.rs b/beacon_chain/validation/src/message_generation.rs
deleted file mode 100644
index 3692988b6..000000000
--- a/beacon_chain/validation/src/message_generation.rs
+++ /dev/null
@@ -1,67 +0,0 @@
-use super::hashing::canonical_hash;
-use super::ssz::SszStream;
-use super::types::Hash256;
-
-/// Generates the message used to validate the signature provided with an AttestationRecord.
-///
-/// Ensures that the signer of the message has a view of the chain that is compatible with ours.
-pub fn generate_signed_message(
-    slot: u64,
-    parent_hashes: &[Hash256],
-    shard_id: u16,
-    shard_block_hash: &Hash256,
-    justified_slot: u64,
-) -> Vec<u8> {
-    /*
-     * Note: it's a little risky here to use SSZ, because the encoding is not necessarily SSZ
-     * (for example, SSZ might change whilst this doesn't).
-     *
-     * I have suggested switching this to ssz here:
-     * https://github.com/ethereum/eth2.0-specs/issues/5
-     *
-     * If this doesn't happen, it would be safer to not use SSZ at all.
-     */
-    let mut ssz_stream = SszStream::new();
-    ssz_stream.append(&slot);
-    ssz_stream.append_vec(&parent_hashes.to_vec());
-    ssz_stream.append(&shard_id);
-    ssz_stream.append(shard_block_hash);
-    ssz_stream.append(&justified_slot);
-    let bytes = ssz_stream.drain();
-    canonical_hash(&bytes)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_generate_signed_message() {
-        let slot = 93;
-        let parent_hashes: Vec<Hash256> = (0..12).map(|i| Hash256::from(i as u64)).collect();
-        let shard_id = 15;
-        let shard_block_hash = Hash256::from("shard_block_hash".as_bytes());
-        let justified_slot = 18;
-
-        let output = generate_signed_message(
-            slot,
-            &parent_hashes,
-            shard_id,
-            &shard_block_hash,
-            justified_slot,
-        );
-
-        /*
-         * Note: this is not some well-known test vector, it's simply the result of running
-         * this and printing the output.
-         *
-         * Once well-known test vectors are established, they should be placed here.
-         */
-        let expected = vec![
-            185, 80, 24, 37, 184, 189, 129, 206, 109, 64, 116, 30, 221, 36, 160, 48, 114, 87, 138,
-            139, 79, 57, 83, 39, 122, 42, 214, 135, 95, 204, 235, 161,
-        ];
-
-        assert_eq!(output, expected);
-    }
-}