diff --git a/lighthouse/main.rs b/lighthouse/main.rs
index 12444f538..603346b36 100644
--- a/lighthouse/main.rs
+++ b/lighthouse/main.rs
@@ -8,12 +8,13 @@ extern crate network_libp2p;
 extern crate futures;
 
 #[macro_use]
-pub mod utils;
-pub mod db;
-pub mod client;
-pub mod state;
-pub mod sync;
-pub mod config;
+mod utils;
+mod bls;
+mod db;
+mod client;
+mod state;
+mod sync;
+mod config;
 
 use std::path::PathBuf;
 
diff --git a/lighthouse/state/validation/attestation_validation.rs b/lighthouse/state/validation/attestation_validation.rs
index 47b6f83fb..d47d15c53 100644
--- a/lighthouse/state/validation/attestation_validation.rs
+++ b/lighthouse/state/validation/attestation_validation.rs
@@ -167,80 +167,3 @@ impl From<ParentHashesError> for AttestationValidationError {
         }
     }
 }
-
-/*
-// Implementation of validate_attestation in the v2.1 python reference implementation see:
-//
-// github.com/ethereum/beacon_chain/beacon_chain/state/state_transition.py
-pub fn validate_attestation_2(
-    crystallized_state: &CrystallizedState,
-    active_state: &ActiveState,
-    attestation: &AttestationRecord,
-    block: &Block,
-    chain_config: &ChainConfig)
-    -> Result<bool, AttestationValidationError> {
-
-        if !(attestation.slot < block.slot_number) {
-            return Err(AttestationValidationError::SlotTooHigh);
-        }
-
-        if !(attestation.slot > (block.slot_number - chain_config.cycle_length as u64)) {
-            return Err(AttestationValidationError::SlotTooLow(format!("Attestation slot number too low\n\tFound: {:?}, Needed greater than: {:?}", attestation.slot, block.slot_number - chain_config.cycle_length as u64)));
-        }
-
-        Ok(true)
-    }
-
-
-#[cfg(test)]
-mod tests {
-
-    use super::*;
-    // test helper functions
-
-    fn generate_standard_state() -> (
-        CrystallizedState,
-        ActiveState,
-        AttestationRecord,
-        Block,
-        ChainConfig) {
-
-        let crystallized_state = CrystallizedState::zero();
-        let active_state = ActiveState::zero();
-        let attestation_record = AttestationRecord::zero();
-        let block = Block::zero();
-        let chain_config = ChainConfig::standard();
-
-        return (crystallized_state, active_state, attestation_record, block, chain_config);
-    }
-
-    #[test]
-    fn test_attestation_validation_slot_high() {
-        // generate standard state
-        let (crystallized_state, active_state, mut attestation_record, mut block, chain_config) = generate_standard_state();
-        // set slot too high
-        attestation_record.slot = 30;
-        block.slot_number = 10;
-
-        let result = validate_attestation(&crystallized_state, &active_state, &attestation_record, &block, &chain_config);
-        assert_eq!(result, Err(AttestationValidationError::SlotTooHigh));
-    }
-
-    #[test]
-    fn test_attestation_validation_slot_low() {
-        // generate standard state
-        let (crystallized_state, active_state, mut attestation_record, mut block, chain_config) = generate_standard_state();
-        // set slot too high
-        attestation_record.slot = 2;
-        block.slot_number = 10;
-
-        let result = validate_attestation(
-            &crystallized_state,
-            &active_state,
-            &attestation_record,
-            &block,
-            &chain_config);
-        //assert_eq!(result, Err(AttestationValidationError::SlotTooLow));
-    }
-}
-*/