diff --git a/src/accountant_skel.rs b/src/accountant_skel.rs
index b4bf805c63b0a7..b4b27de03930c3 100644
--- a/src/accountant_skel.rs
+++ b/src/accountant_skel.rs
@@ -22,12 +22,14 @@ use std::io::Write;
 use std::net::{SocketAddr, UdpSocket};
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::mpsc::{channel, Receiver, Sender};
-use std::sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex, RwLock};
 use std::thread::{spawn, JoinHandle};
 use std::time::Duration;
 use streamer;
 use transaction::Transaction;
 
+use subscribers;
+
 pub struct AccountantSkel<W: Write + Send + 'static> {
     acc: Accountant,
     last_id: Hash,
@@ -245,8 +247,36 @@ impl<W: Write + Send + 'static> AccountantSkel<W> {
         }
         Ok(())
     }
+    /// Process verified blobs, already in order
+    /// Respond with a signed hash of the state
+    fn replicate_state(
+        obj: &Arc<Mutex<AccountantSkel<W>>>,
+        verified_receiver: &streamer::BlobReceiver,
+        blob_recycler: &packet::BlobRecycler,
+    ) -> Result<()> {
+        let timer = Duration::new(1, 0);
+        let blobs = verified_receiver.recv_timeout(timer)?;
+        for msgs in &blobs {
+            let blob = msgs.read().unwrap();
+            let entries: Vec<Entry> = deserialize(&blob.data()[..blob.meta.size]).unwrap();
+            for entry in entries {
+                obj.lock().unwrap().acc.register_entry_id(&entry.id);
+
+                obj.lock()
+                    .unwrap()
+                    .acc
+                    .process_verified_events(entry.events)?;
+            }
+            //TODO respond back to leader with hash of the state
+        }
+        for blob in blobs {
+            blob_recycler.recycle(blob);
+        }
+        Ok(())
+    }
 
     /// Create a UDP microservice that forwards messages the given AccountantSkel.
+    /// This service is the network leader
     /// Set `exit` to shutdown its threads.
     pub fn serve(
         obj: &Arc<Mutex<AccountantSkel<W>>>,
@@ -279,7 +309,7 @@ impl<W: Write + Send + 'static> AccountantSkel<W> {
 
         let skel = obj.clone();
         let t_server = spawn(move || loop {
-            let e = AccountantSkel::process(
+            let e = Self::process(
                 &skel,
                 &verified_receiver,
                 &blob_sender,
@@ -292,6 +322,75 @@ impl<W: Write + Send + 'static> AccountantSkel<W> {
         });
         Ok(vec![t_receiver, t_responder, t_server, t_verifier])
     }
+
+    /// This service receives messages from a leader in the network and processes the transactions
+    /// on the accountant state.
+    /// # Arguments
+    /// * `obj` - The accountant state.
+    /// * `rsubs` - The subscribers.
+    /// * `exit` - The exit signal.
+    /// # Remarks
+    /// The pipeline is constructed as follows:
+    /// 1. receive blobs from the network, these are out of order
+    /// 2. verify blobs, PoH, signatures (TODO)
+    /// 3. reconstruct contiguous window
+    ///     a. order the blobs
+    ///     b. use erasure coding to reconstruct missing blobs
+    ///     c. ask the network for missing blobs, if erasure coding is insufficient
+    ///     d. make sure that the blobs PoH sequences connect (TODO)
+    /// 4. process the transaction state machine
+    /// 5. respond with the hash of the state back to the leader
+    pub fn replicate(
+        obj: &Arc<Mutex<AccountantSkel<W>>>,
+        rsubs: subscribers::Subscribers,
+        exit: Arc<AtomicBool>,
+    ) -> Result<Vec<JoinHandle<()>>> {
+        let read = UdpSocket::bind(rsubs.me.addr)?;
+        // make sure we are on the same interface
+        let mut local = read.local_addr()?;
+        local.set_port(0);
+        let write = UdpSocket::bind(local)?;
+
+        let blob_recycler = packet::BlobRecycler::default();
+        let (blob_sender, blob_receiver) = channel();
+        let t_blob_receiver = streamer::blob_receiver(
+            exit.clone(),
+            blob_recycler.clone(),
+            read,
+            blob_sender.clone(),
+        )?;
+        let (window_sender, window_receiver) = channel();
+        let (retransmit_sender, retransmit_receiver) = channel();
+
+        let subs = Arc::new(RwLock::new(rsubs));
+        let t_retransmit = streamer::retransmitter(
+            write,
+            exit.clone(),
+            subs.clone(),
+            blob_recycler.clone(),
+            retransmit_receiver,
+        );
+        //TODO
+        //the packets coming out of blob_receiver need to be sent to the GPU and verified
+        //then sent to the window, which does the erasure coding reconstruction
+        let t_window = streamer::window(
+            exit.clone(),
+            subs,
+            blob_recycler.clone(),
+            blob_receiver,
+            window_sender,
+            retransmit_sender,
+        );
+
+        let skel = obj.clone();
+        let t_server = spawn(move || loop {
+            let e = Self::replicate_state(&skel, &window_receiver, &blob_recycler);
+            if e.is_err() && exit.load(Ordering::Relaxed) {
+                break;
+            }
+        });
+        Ok(vec![t_blob_receiver, t_retransmit, t_window, t_server])
+    }
 }
 
 #[cfg(test)]
@@ -319,7 +418,7 @@ mod tests {
     use accountant_skel::{to_packets, Request};
     use bincode::serialize;
     use ecdsa;
-    use packet::{PacketRecycler, NUM_PACKETS};
+    use packet::{BlobRecycler, PacketRecycler, NUM_PACKETS};
     use transaction::{memfind, test_tx};
 
     use accountant::Accountant;
@@ -340,6 +439,15 @@ mod tests {
     use std::time::Duration;
     use transaction::Transaction;
 
+    use subscribers::{Node, Subscribers};
+    use streamer;
+    use std::sync::mpsc::channel;
+    use std::collections::VecDeque;
+    use hash::{hash, Hash};
+    use event::Event;
+    use entry;
+    use chrono::prelude::*;
+
     #[test]
     fn test_layout() {
         let tr = test_tx();
@@ -444,6 +552,138 @@ mod tests {
         exit.store(true, Ordering::Relaxed);
     }
 
+    use std::sync::{Once, ONCE_INIT};
+    extern crate env_logger;
+
+    static INIT: Once = ONCE_INIT;
+
+    /// Setup function that is only run once, even if called multiple times.
+    fn setup() {
+        INIT.call_once(|| {
+            env_logger::init().unwrap();
+        });
+    }
+
+    #[test]
+    fn test_replicate() {
+        setup();
+        let leader_sock = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let leader_addr = leader_sock.local_addr().unwrap();
+        let me_addr = "127.0.0.1:9010".parse().unwrap();
+        let target_peer_sock = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let target_peer_addr = target_peer_sock.local_addr().unwrap();
+        let source_peer_sock = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let exit = Arc::new(AtomicBool::new(false));
+
+        let node_me = Node::new([0, 0, 0, 0, 0, 0, 0, 1], 10, me_addr);
+        let node_subs = vec![Node::new([0, 0, 0, 0, 0, 0, 0, 2], 8, target_peer_addr); 1];
+        let node_leader = Node::new([0, 0, 0, 0, 0, 0, 0, 3], 20, leader_addr);
+        let subs = Subscribers::new(node_me, node_leader, &node_subs);
+
+        // setup some blob services to send blobs into the socket
+        // to simulate the source peer and get blobs out of the socket to
+        // simulate target peer
+        let recv_recycler = BlobRecycler::default();
+        let resp_recycler = BlobRecycler::default();
+        let (s_reader, r_reader) = channel();
+        let t_receiver = streamer::blob_receiver(
+            exit.clone(),
+            recv_recycler.clone(),
+            target_peer_sock,
+            s_reader,
+        ).unwrap();
+        let (s_responder, r_responder) = channel();
+        let t_responder = streamer::responder(
+            source_peer_sock,
+            exit.clone(),
+            resp_recycler.clone(),
+            r_responder,
+        );
+
+        let starting_balance = 10_000;
+        let alice = Mint::new(starting_balance);
+        let acc = Accountant::new(&alice);
+        let historian = Historian::new(&alice.last_id(), Some(30));
+        let acc = Arc::new(Mutex::new(AccountantSkel::new(
+            acc,
+            alice.last_id(),
+            sink(),
+            historian,
+        )));
+
+        let _threads = AccountantSkel::replicate(&acc, subs, exit.clone()).unwrap();
+
+        let mut alice_ref_balance = starting_balance;
+        let mut msgs = VecDeque::new();
+        let mut cur_hash = Hash::default();
+        let num_blobs = 10;
+        let transfer_amount = 501;
+        let bob_keypair = KeyPair::new();
+        for i in 0..num_blobs {
+            let b = resp_recycler.allocate();
+            let b_ = b.clone();
+            let mut w = b.write().unwrap();
+            w.set_index(i).unwrap();
+
+            let tr0 = Event::new_timestamp(&bob_keypair, Utc::now());
+            let entry0 = entry::create_entry(&cur_hash, i, vec![tr0]);
+            acc.lock().unwrap().acc.register_entry_id(&cur_hash);
+            cur_hash = hash(&cur_hash);
+
+            let tr1 = Transaction::new(
+                &alice.keypair(),
+                bob_keypair.pubkey(),
+                transfer_amount,
+                cur_hash,
+            );
+            acc.lock().unwrap().acc.register_entry_id(&cur_hash);
+            cur_hash = hash(&cur_hash);
+            let entry1 =
+                entry::create_entry(&cur_hash, i + num_blobs, vec![Event::Transaction(tr1)]);
+            acc.lock().unwrap().acc.register_entry_id(&cur_hash);
+            cur_hash = hash(&cur_hash);
+
+            alice_ref_balance -= transfer_amount;
+
+            let serialized_entry = serialize(&vec![entry0, entry1]).unwrap();
+
+            w.data_mut()[..serialized_entry.len()].copy_from_slice(&serialized_entry);
+            w.set_size(serialized_entry.len());
+            w.meta.set_addr(&me_addr);
+            drop(w);
+            msgs.push_back(b_);
+        }
+
+        // send the blobs into the socket
+        s_responder.send(msgs).expect("send");
+
+        // receive retransmitted messages
+        let timer = Duration::new(1, 0);
+        let mut msgs: Vec<_> = Vec::new();
+        while let Ok(msg) = r_reader.recv_timeout(timer) {
+            trace!("msg: {:?}", msg);
+            msgs.push(msg);
+        }
+
+        let alice_balance = acc.lock()
+            .unwrap()
+            .acc
+            .get_balance(&alice.keypair().pubkey())
+            .unwrap();
+        assert_eq!(alice_balance, alice_ref_balance);
+
+        let bob_balance = acc.lock()
+            .unwrap()
+            .acc
+            .get_balance(&bob_keypair.pubkey())
+            .unwrap();
+        assert_eq!(bob_balance, starting_balance - alice_ref_balance);
+
+        exit.store(true, Ordering::Relaxed);
+        t_receiver.join().expect("join");
+        t_responder.join().expect("join");
+    }
+
 }
 
 #[cfg(all(feature = "unstable", test))]
diff --git a/src/packet.rs b/src/packet.rs
index 2106bf5dab546b..d97b261e9f0fc8 100644
--- a/src/packet.rs
+++ b/src/packet.rs
@@ -6,6 +6,7 @@ use std::fmt;
 use std::io;
 use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, UdpSocket};
 use std::sync::{Arc, Mutex, RwLock};
+use std::mem::size_of;
 
 pub type SharedPackets = Arc<RwLock<Packets>>;
 pub type SharedBlob = Arc<RwLock<Blob>>;
@@ -210,23 +211,28 @@ impl Packets {
     }
 }
 
+const BLOB_INDEX_SIZE: usize = size_of::<u64>();
+
 impl Blob {
     pub fn get_index(&self) -> Result<u64> {
-        let mut rdr = io::Cursor::new(&self.data[0..8]);
+        let mut rdr = io::Cursor::new(&self.data[0..BLOB_INDEX_SIZE]);
         let r = rdr.read_u64::<LittleEndian>()?;
         Ok(r)
     }
     pub fn set_index(&mut self, ix: u64) -> Result<()> {
         let mut wtr = vec![];
         wtr.write_u64::<LittleEndian>(ix)?;
-        self.data[..8].clone_from_slice(&wtr);
+        self.data[..BLOB_INDEX_SIZE].clone_from_slice(&wtr);
         Ok(())
     }
     pub fn data(&self) -> &[u8] {
-        &self.data[8..]
+        &self.data[BLOB_INDEX_SIZE..]
     }
     pub fn data_mut(&mut self) -> &mut [u8] {
-        &mut self.data[8..]
+        &mut self.data[BLOB_INDEX_SIZE..]
+    }
+    pub fn set_size(&mut self, size: usize) {
+        self.meta.size = size + BLOB_INDEX_SIZE;
     }
     pub fn recv_from(re: &BlobRecycler, socket: &UdpSocket) -> Result<VecDeque<SharedBlob>> {
         let mut v = VecDeque::new();
diff --git a/src/result.rs b/src/result.rs
index 9b3c17a3695fde..01872dfbe1138c 100644
--- a/src/result.rs
+++ b/src/result.rs
@@ -4,6 +4,7 @@ use bincode;
 use serde_json;
 use std;
 use std::any::Any;
+use accountant;
 
 #[derive(Debug)]
 pub enum Error {
@@ -14,6 +15,7 @@ pub enum Error {
     RecvError(std::sync::mpsc::RecvError),
     RecvTimeoutError(std::sync::mpsc::RecvTimeoutError),
     Serialize(std::boxed::Box<bincode::ErrorKind>),
+    AccountingError(accountant::AccountingError),
     SendError,
     Services,
 }
@@ -30,6 +32,11 @@ impl std::convert::From<std::sync::mpsc::RecvTimeoutError> for Error {
         Error::RecvTimeoutError(e)
     }
 }
+impl std::convert::From<accountant::AccountingError> for Error {
+    fn from(e: accountant::AccountingError) -> Error {
+        Error::AccountingError(e)
+    }
+}
 impl<T> std::convert::From<std::sync::mpsc::SendError<T>> for Error {
     fn from(_e: std::sync::mpsc::SendError<T>) -> Error {
         Error::SendError
diff --git a/src/streamer.rs b/src/streamer.rs
index 33882c31dcffda..43e6f2ac353216 100644
--- a/src/streamer.rs
+++ b/src/streamer.rs
@@ -8,7 +8,7 @@ use std::sync::mpsc;
 use std::sync::{Arc, RwLock};
 use std::thread::{spawn, JoinHandle};
 use std::time::Duration;
-use subscribers;
+use subscribers::Subscribers;
 
 pub type PacketReceiver = mpsc::Receiver<SharedPackets>;
 pub type PacketSender = mpsc::Sender<SharedPackets>;
@@ -99,19 +99,22 @@ pub fn blob_receiver(
         if exit.load(Ordering::Relaxed) {
             break;
         }
-        let _ = recv_blobs(&recycler, &sock, &s);
+        let ret = recv_blobs(&recycler, &sock, &s);
+        if ret.is_err() {
+            break;
+        }
     });
     Ok(t)
 }
 
 fn recv_window(
     window: &mut Vec<Option<SharedBlob>>,
-    subs: &Arc<RwLock<subscribers::Subscribers>>,
+    subs: &Arc<RwLock<Subscribers>>,
     recycler: &BlobRecycler,
     consumed: &mut usize,
     r: &BlobReceiver,
     s: &BlobSender,
-    cast: &BlobSender,
+    retransmit: &BlobSender,
 ) -> Result<()> {
     let timer = Duration::new(1, 0);
     let mut dq = r.recv_timeout(timer)?;
@@ -120,12 +123,18 @@ fn recv_window(
     }
     {
         //retransmit all leader blocks
-        let mut castq = VecDeque::new();
+        let mut retransmitq = VecDeque::new();
         let rsubs = subs.read().unwrap();
         for b in &dq {
             let p = b.read().unwrap();
             //TODO this check isn't safe against adverserial packets
             //we need to maintain a sequence window
+            trace!(
+                "idx: {} addr: {:?} leader: {:?}",
+                p.get_index().unwrap(),
+                p.meta.addr(),
+                rsubs.leader.addr
+            );
             if p.meta.addr() == rsubs.leader.addr {
                 //TODO
                 //need to copy the retransmited blob
@@ -141,11 +150,11 @@ fn recv_window(
                     mnv.meta.size = sz;
                     mnv.data[..sz].copy_from_slice(&p.data[..sz]);
                 }
-                castq.push_back(nv);
+                retransmitq.push_back(nv);
             }
         }
-        if !castq.is_empty() {
-            cast.send(castq)?;
+        if !retransmitq.is_empty() {
+            retransmit.send(retransmitq)?;
         }
     }
     //send a contiguous set of blocks
@@ -158,6 +167,7 @@ fn recv_window(
         //TODO, after the block are authenticated
         //if we get different blocks at the same index
         //that is a network failure/attack
+        trace!("window w: {} size: {}", w, p.meta.size);
         {
             if window[w].is_none() {
                 window[w] = Some(b_);
@@ -166,6 +176,7 @@ fn recv_window(
             }
             loop {
                 let k = *consumed % NUM_BLOBS;
+                trace!("k: {} consumed: {}", k, *consumed);
                 if window[k].is_none() {
                     break;
                 }
@@ -175,6 +186,7 @@ fn recv_window(
             }
         }
     }
+    trace!("sending contq.len: {}", contq.len());
     if !contq.is_empty() {
         s.send(contq)?;
     }
@@ -183,11 +195,11 @@ fn recv_window(
 
 pub fn window(
     exit: Arc<AtomicBool>,
-    subs: Arc<RwLock<subscribers::Subscribers>>,
+    subs: Arc<RwLock<Subscribers>>,
     recycler: BlobRecycler,
     r: BlobReceiver,
     s: BlobSender,
-    cast: BlobSender,
+    retransmit: BlobSender,
 ) -> JoinHandle<()> {
     spawn(move || {
         let mut window = vec![None; NUM_BLOBS];
@@ -196,13 +208,21 @@ pub fn window(
             if exit.load(Ordering::Relaxed) {
                 break;
             }
-            let _ = recv_window(&mut window, &subs, &recycler, &mut consumed, &r, &s, &cast);
+            let _ = recv_window(
+                &mut window,
+                &subs,
+                &recycler,
+                &mut consumed,
+                &r,
+                &s,
+                &retransmit,
+            );
         }
     })
 }
 
 fn retransmit(
-    subs: &Arc<RwLock<subscribers::Subscribers>>,
+    subs: &Arc<RwLock<Subscribers>>,
     recycler: &BlobRecycler,
     r: &BlobReceiver,
     sock: &UdpSocket,
@@ -237,7 +257,7 @@ fn retransmit(
 pub fn retransmitter(
     sock: UdpSocket,
     exit: Arc<AtomicBool>,
-    subs: Arc<RwLock<subscribers::Subscribers>>,
+    subs: Arc<RwLock<Subscribers>>,
     recycler: BlobRecycler,
     r: BlobReceiver,
 ) -> JoinHandle<()> {
@@ -442,20 +462,21 @@ mod test {
         let subs = Arc::new(RwLock::new(Subscribers::new(
             Node::default(),
             Node::new([0; 8], 0, send.local_addr().unwrap()),
+            &[],
         )));
         let resp_recycler = BlobRecycler::default();
         let (s_reader, r_reader) = channel();
         let t_receiver =
             blob_receiver(exit.clone(), resp_recycler.clone(), read, s_reader).unwrap();
         let (s_window, r_window) = channel();
-        let (s_cast, r_cast) = channel();
+        let (s_retransmit, r_retransmit) = channel();
         let t_window = window(
             exit.clone(),
             subs,
             resp_recycler.clone(),
             r_reader,
             s_window,
-            s_cast,
+            s_retransmit,
         );
         let (s_responder, r_responder) = channel();
         let t_responder = responder(send, exit.clone(), resp_recycler.clone(), r_responder);
@@ -475,8 +496,8 @@ mod test {
         let mut num = 0;
         get_blobs(r_window, &mut num);
         assert_eq!(num, 10);
-        let mut q = r_cast.recv().unwrap();
-        while let Ok(mut nq) = r_cast.try_recv() {
+        let mut q = r_retransmit.recv().unwrap();
+        while let Ok(mut nq) = r_retransmit.try_recv() {
             q.append(&mut nq);
         }
         assert_eq!(q.len(), 10);
@@ -494,9 +515,8 @@ mod test {
         let subs = Arc::new(RwLock::new(Subscribers::new(
             Node::default(),
             Node::default(),
+            &[Node::new([0; 8], 1, read.local_addr().unwrap())],
         )));
-        let n3 = Node::new([0; 8], 1, read.local_addr().unwrap());
-        subs.write().unwrap().insert(&[n3]);
         let (s_retransmit, r_retransmit) = channel();
         let blob_recycler = BlobRecycler::default();
         let saddr = send.local_addr().unwrap();
diff --git a/src/subscribers.rs b/src/subscribers.rs
index 153246d12adb31..f0b271c43960b5 100644
--- a/src/subscribers.rs
+++ b/src/subscribers.rs
@@ -11,6 +11,8 @@ use rayon::prelude::*;
 use result::{Error, Result};
 use std::net::{SocketAddr, UdpSocket};
 
+use std::fmt;
+
 #[derive(Clone, PartialEq)]
 pub struct Node {
     pub id: [u64; 8],
@@ -38,20 +40,27 @@ impl Node {
     }
 }
 
+impl fmt::Debug for Node {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Node {{ weight: {} addr: {} }}", self.weight, self.addr)
+    }
+}
+
 pub struct Subscribers {
     data: Vec<Node>,
-    me: Node,
+    pub me: Node,
     pub leader: Node,
 }
 
 impl Subscribers {
-    pub fn new(me: Node, leader: Node) -> Subscribers {
+    pub fn new(me: Node, leader: Node, network: &[Node]) -> Subscribers {
         let mut h = Subscribers {
             data: vec![],
             me: me.clone(),
             leader: leader.clone(),
         };
         h.insert(&[me, leader]);
+        h.insert(network);
         h
     }
 
@@ -99,7 +108,7 @@ mod test {
         me.weight = 10;
         let mut leader = Node::default();
         leader.weight = 11;
-        let mut s = Subscribers::new(me, leader);
+        let mut s = Subscribers::new(me, leader, &[]);
         assert_eq!(s.data.len(), 2);
         assert_eq!(s.data[0].weight, 11);
         assert_eq!(s.data[1].weight, 10);
@@ -116,7 +125,7 @@ mod test {
         let s3 = UdpSocket::bind("127.0.0.1:0").expect("bind");
         let n1 = Node::new([0; 8], 0, s1.local_addr().unwrap());
         let n2 = Node::new([0; 8], 0, s2.local_addr().unwrap());
-        let mut s = Subscribers::new(n1.clone(), n2.clone());
+        let mut s = Subscribers::new(n1.clone(), n2.clone(), &[]);
         let n3 = Node::new([0; 8], 0, s3.local_addr().unwrap());
         s.insert(&[n3]);
         let mut b = Blob::default();