diff --git a/beacon_node/beacon_chain/src/initialise.rs b/beacon_node/beacon_chain/src/initialise.rs
index 131782470b..a8289a062e 100644
--- a/beacon_node/beacon_chain/src/initialise.rs
+++ b/beacon_node/beacon_chain/src/initialise.rs
@@ -106,7 +106,7 @@ pub fn initialise_test_beacon_chain(
         deposit_root: Hash256::zero(),
         block_hash: Hash256::zero(),
     };
-    let keypairs: Vec<Keypair> = (0..10)
+    let keypairs: Vec<Keypair> = (0..50)
         .collect::<Vec<usize>>()
         .iter()
         .map(|_| Keypair::random())
diff --git a/beacon_node/beacon_chain/src/lib.rs b/beacon_node/beacon_chain/src/lib.rs
index 89ee2029c0..5acac6ff22 100644
--- a/beacon_node/beacon_chain/src/lib.rs
+++ b/beacon_node/beacon_chain/src/lib.rs
@@ -7,4 +7,7 @@ pub mod initialise;
 pub use self::beacon_chain::{BeaconChain, BlockProcessingOutcome, InvalidBlock, ValidBlock};
 pub use self::checkpoint::CheckPoint;
 pub use self::errors::BeaconChainError;
-pub use fork_choice::{ForkChoice, ForkChoiceAlgorithm, ForkChoiceError};
+pub use db;
+pub use fork_choice;
+pub use parking_lot;
+pub use slot_clock;
diff --git a/beacon_node/client/src/client_types.rs b/beacon_node/client/src/client_types.rs
index 744c9ab98b..de0678fe78 100644
--- a/beacon_node/client/src/client_types.rs
+++ b/beacon_node/client/src/client_types.rs
@@ -1,39 +1,49 @@
-use db::{ClientDB, DiskDB, MemoryDB};
-use fork_choice::{BitwiseLMDGhost, ForkChoice};
-use slot_clock::{SlotClock, SystemTimeSlotClock, TestingSlotClock};
-use beacon_chain::initialise;
+use crate::ClientConfig;
+use beacon_chain::{
+    db::{ClientDB, DiskDB, MemoryDB},
+    fork_choice::BitwiseLMDGhost,
+    initialise,
+    slot_clock::{SlotClock, SystemTimeSlotClock, TestingSlotClock},
+    BeaconChain,
+};
+use fork_choice::ForkChoice;
+
 use std::sync::Arc;
-use crate::ClientConfig
 
 pub trait ClientTypes {
-    type ForkChoice: ForkChoice;
-    type DB: ClientDB;
-    type SlotClock: SlotClock;
+    type DB: ClientDB + 'static;
+    type SlotClock: SlotClock + 'static;
+    type ForkChoice: ForkChoice + 'static;
 
-    pub fn initialise_beacon_chain(cchain_spec: &ClientConfig) -> Arc<BeaconChain<DB,SlotClock,ForkChoice>>);
+    fn initialise_beacon_chain(
+        config: &ClientConfig,
+    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice>>;
 }
 
-pub struct StandardClientType
+pub struct StandardClientType;
 
 impl ClientTypes for StandardClientType {
     type DB = DiskDB;
-    type ForkChoice = BitwiseLMDGhost<DiskDB>;
     type SlotClock = SystemTimeSlotClock;
+    type ForkChoice = BitwiseLMDGhost<DiskDB>;
 
-    pub fn initialise_beacon_chain(config: &ClientConfig) -> Arc<BeaconChain<DB,SlotClock,ForkChoice>>) {
-        initialise::initialise_beacon_chain(config.chain_spec, config.db_name)
+    fn initialise_beacon_chain(
+        config: &ClientConfig,
+    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice>> {
+        initialise::initialise_beacon_chain(&config.spec, Some(&config.db_name))
     }
-
 }
 
-pub struct TestingClientType
+pub struct TestingClientType;
 
 impl ClientTypes for TestingClientType {
     type DB = MemoryDB;
-    type SlotClock = TestingSlotClock;
+    type SlotClock = SystemTimeSlotClock;
     type ForkChoice = BitwiseLMDGhost<MemoryDB>;
 
-    pub fn initialise_beacon_chain(config: &ClientConfig) -> Arc<BeaconChain<DB,SlotClock,ForkChoice>>) {
-        initialise::initialise_test_beacon_chain(config.chain_spec, None)
+    fn initialise_beacon_chain(
+        config: &ClientConfig,
+    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice>> {
+        initialise::initialise_test_beacon_chain(&config.spec, None)
     }
 }
diff --git a/beacon_node/client/src/lib.rs b/beacon_node/client/src/lib.rs
index 46221c200b..f3178eaa66 100644
--- a/beacon_node/client/src/lib.rs
+++ b/beacon_node/client/src/lib.rs
@@ -10,6 +10,7 @@ pub use client_config::ClientConfig;
 pub use client_types::ClientTypes;
 
 //use beacon_chain::BeaconChain;
+use beacon_chain::BeaconChain;
 use exit_future::{Exit, Signal};
 use network::Service as NetworkService;
 use slog::o;
@@ -20,26 +21,35 @@ use tokio::runtime::TaskExecutor;
 /// Main beacon node client service. This provides the connection and initialisation of the clients
 /// sub-services in multiple threads.
 pub struct Client<T: ClientTypes> {
+    /// Configuration for the lighthouse client.
     config: ClientConfig,
+    /// The beacon chain for the running client.
     beacon_chain: Arc<BeaconChain<T::DB, T::SlotClock, T::ForkChoice>>,
+    /// Reference to the network service.
     pub network: Arc<NetworkService>,
+    /// Future to stop and begin shutdown of the Client.
+    //TODO: Decide best way to handle shutdown
     pub exit: exit_future::Exit,
+    /// The sending future to call to terminate the Client.
+    //TODO: Decide best way to handle shutdown
     pub exit_signal: Signal,
+    /// The clients logger.
     log: slog::Logger,
+    /// Marker to pin the beacon chain generics.
+    phantom: PhantomData<T>,
 }
 
-impl<T: ClientTypes> Client<T> {
-    /// Generate an instance of the client. Spawn and link all internal subprocesses.
+impl<TClientType: ClientTypes> Client<TClientType> {
+    /// Generate an instance of the client. Spawn and link all internal sub-processes.
     pub fn new(
         config: ClientConfig,
-        client_type: T,
         log: slog::Logger,
         executor: &TaskExecutor,
     ) -> error::Result<Self> {
         let (exit_signal, exit) = exit_future::signal();
 
         // generate a beacon chain
-        let beacon_chain = client_type.initialise_beacon_chain(&config);
+        let beacon_chain = TClientType::initialise_beacon_chain(&config);
 
         // Start the network service, libp2p and syncing threads
         // TODO: Add beacon_chain reference to network parameters
@@ -54,6 +64,7 @@ impl<T: ClientTypes> Client<T> {
 
         Ok(Client {
             config,
+            beacon_chain,
             exit,
             exit_signal: exit_signal,
             log,
diff --git a/beacon_node/network/src/beacon_chain.rs b/beacon_node/network/src/beacon_chain.rs
new file mode 100644
index 0000000000..5e0857f47b
--- /dev/null
+++ b/beacon_node/network/src/beacon_chain.rs
@@ -0,0 +1,27 @@
+use beacon_chain::BeaconChain as RawBeaconChain;
+use beacon_chain::{
+    db::ClientDB, fork_choice::ForkChoice, parking_lot::RwLockReadGuard, slot_clock::SlotClock,
+    CheckPoint,
+};
+
+/// The network's API to the beacon chain.
+pub trait BeaconChain: Send + Sync {
+    fn head(&self) -> RwLockReadGuard<CheckPoint>;
+
+    fn finalized_head(&self) -> RwLockReadGuard<CheckPoint>;
+}
+
+impl<T, U, F> BeaconChain for RawBeaconChain<T, U, F>
+where
+    T: ClientDB + Sized,
+    U: SlotClock,
+    F: ForkChoice,
+{
+    fn head(&self) -> RwLockReadGuard<CheckPoint> {
+        self.head()
+    }
+
+    fn finalized_head(&self) -> RwLockReadGuard<CheckPoint> {
+        self.finalized_head()
+    }
+}
diff --git a/beacon_node/network/src/lib.rs b/beacon_node/network/src/lib.rs
index 49b2abadd7..dca83bb773 100644
--- a/beacon_node/network/src/lib.rs
+++ b/beacon_node/network/src/lib.rs
@@ -1,4 +1,5 @@
 /// This crate provides the network server for Lighthouse.
+pub mod beacon_chain;
 pub mod error;
 mod message_handler;
 mod messages;
diff --git a/beacon_node/network/src/message_handler.rs b/beacon_node/network/src/message_handler.rs
index 4ebedb89a3..0471e8ce50 100644
--- a/beacon_node/network/src/message_handler.rs
+++ b/beacon_node/network/src/message_handler.rs
@@ -1,14 +1,14 @@
+use crate::beacon_chain::BeaconChain;
 use crate::error;
 use crate::messages::NodeMessage;
-use beacon_chain::BeaconChain;
-use crossbeam_channel::{unbounded as channel, Sender, TryRecvError};
+use crossbeam_channel::{unbounded as channel, Sender};
 use futures::future;
 use futures::prelude::*;
 use libp2p::rpc;
 use libp2p::{PeerId, RPCEvent};
 use slog::debug;
 use std::collections::HashMap;
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use std::time::{Duration, Instant};
 use sync::SimpleSync;
 use types::Hash256;
@@ -17,9 +17,9 @@ use types::Hash256;
 const HELLO_TIMEOUT: Duration = Duration::from_secs(30);
 
 /// Handles messages received from the network and client and organises syncing.
-pub struct MessageHandler<T: ClientTypes> {
+pub struct MessageHandler {
     /// Currently loaded and initialised beacon chain.
-    chain: BeaconChain<T::DB, T::SlotClock, T::ForkChoice>,
+    chain: Arc<BeaconChain>,
     /// The syncing framework.
     sync: SimpleSync,
     /// A mapping of peers we have sent a HELLO rpc request to.
@@ -41,10 +41,10 @@ pub enum HandlerMessage {
     RPC(RPCEvent),
 }
 
-impl<T: ClientTypes> MessageHandler<T> {
+impl MessageHandler {
     /// Initializes and runs the MessageHandler.
     pub fn new(
-        beacon_chain: Arc<BeaconChain<T::DB, T::SlotClock, T::ForkChoice>>,
+        beacon_chain: Arc<BeaconChain>,
         executor: &tokio::runtime::TaskExecutor,
         log: slog::Logger,
     ) -> error::Result<Sender<HandlerMessage>> {
@@ -60,7 +60,7 @@ impl<T: ClientTypes> MessageHandler<T> {
         // generate the Message handler
         let sync = SimpleSync::new(temp_genesis);
         let mut handler = MessageHandler {
-            chain: beacon_chain,
+            chain: beacon_chain.clone(),
             sync,
             hello_requests: HashMap::new(),
             log: log.clone(),
diff --git a/beacon_node/network/src/service.rs b/beacon_node/network/src/service.rs
index 6b9c0aff0a..e42b391058 100644
--- a/beacon_node/network/src/service.rs
+++ b/beacon_node/network/src/service.rs
@@ -1,46 +1,42 @@
+use crate::beacon_chain::BeaconChain;
 use crate::error;
 use crate::message_handler::{HandlerMessage, MessageHandler};
 use crate::messages::{NetworkMessage, NodeMessage};
 use crate::NetworkConfig;
 use crossbeam_channel::{unbounded as channel, Sender, TryRecvError};
-use futures::future::lazy;
-use futures::future::poll_fn;
 use futures::prelude::*;
 use futures::sync::oneshot;
 use futures::Stream;
-use libp2p::behaviour::BehaviourEvent;
-use libp2p::error::Error as libp2pError;
 use libp2p::Service as LibP2PService;
 use libp2p::{Libp2pEvent, PeerId};
-use slog::{debug, info, o, trace, warn, Logger};
-use std::sync::{Arc, Mutex};
+use slog::{debug, o};
+use std::sync::Arc;
 use tokio::runtime::TaskExecutor;
-use client::ClientTypes;
 
 /// Service that handles communication between internal services and the libp2p network service.
-pub struct Service<T: ClientTypes> {
+pub struct Service {
     //libp2p_service: Arc<Mutex<LibP2PService>>,
     libp2p_exit: oneshot::Sender<()>,
     network_send: crossbeam_channel::Sender<NetworkMessage>,
     //message_handler: MessageHandler,
     //message_handler_send: Sender<HandlerMessage>,
-    PhantomData: T,
 }
 
-impl<T: ClientTypes> Service<T> {
+impl Service {
     pub fn new(
-        beacon_chain: Arc<BeaconChain<T::DB, T::SlotClock, T::ForkChoice>,
+        beacon_chain: Arc<BeaconChain>,
         config: &NetworkConfig,
         executor: &TaskExecutor,
         log: slog::Logger,
     ) -> error::Result<(Arc<Self>, Sender<NetworkMessage>)> {
         // launch message handler thread
         let message_handler_log = log.new(o!("Service" => "MessageHandler"));
-        let message_handler_send = MessageHandler::new(beacon_chain, executor, message_handler_log)?;
+        let message_handler_send =
+            MessageHandler::new(beacon_chain, executor, message_handler_log)?;
 
         // launch libp2p service
         let libp2p_log = log.new(o!("Service" => "Libp2p"));
-        let libp2p_service = LibP2PService::new(config, libp2p_log)?;
+        let libp2p_service = LibP2PService::new(config.clone(), libp2p_log)?;
 
         // TODO: Spawn thread to handle libp2p messages and pass to message handler thread.
         let (network_send, libp2p_exit) =