diff --git a/src/accountant_skel.rs b/src/accountant_skel.rs
index 41d8f90ede1292..4b0468374df51f 100644
--- a/src/accountant_skel.rs
+++ b/src/accountant_skel.rs
@@ -22,11 +22,12 @@ 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::Subscribers;
 
 pub struct AccountantSkel<W: Write + Send + 'static> {
     acc: Accountant,
@@ -245,8 +246,32 @@ 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 entries:Vec<Entry> = {
+                let m = msgs.read().unwrap();
+                let r = deserialize(&m.data[..m.meta.size])?;
+                r
+            };
+            for e in entries {
+                obj.lock().unwrap().acc.process_verified_events(e.events)?;
+            }
+            blob_recycler.recycle(msgs);
+        }
+        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 +304,7 @@ 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 +317,71 @@ 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,
+        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)?;
+        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 comming 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 +409,7 @@ 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;
@@ -339,6 +429,12 @@ 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 packet::{PACKET_DATA_SIZE};
+
     #[test]
     fn test_layout() {
         let tr = test_tx();
@@ -443,6 +539,56 @@ mod tests {
         exit.store(true, Ordering::Relaxed);
     }
 
+    #[test]
+    fn test_replicate() {
+        let read = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let addr = read.local_addr().unwrap();
+        let send = UdpSocket::bind("127.0.0.1:0").expect("bind");
+        let exit = Arc::new(AtomicBool::new(false));
+
+        let node_me = Node::default();
+        let node_leader = Node::new([0; 8], 0, send.local_addr().unwrap());
+        let subs = Subscribers::new(node_me, node_leader, &[]);
+
+        let recv_recycler = PacketRecycler::default();
+        let resp_recycler = BlobRecycler::default();
+        let (s_reader, r_reader) = channel();
+        let t_receiver = streamer::receiver(read, exit.clone(), recv_recycler.clone(), s_reader).unwrap();
+        let (s_responder, r_responder) = channel();
+        let t_responder = streamer::responder(send, exit.clone(), resp_recycler.clone(), r_responder);
+
+        let alice = Mint::new(10_000);
+        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 msgs = VecDeque::new();
+        for i in 0..10 {
+            let b = resp_recycler.allocate();
+            let b_ = b.clone();
+            let mut w = b.write().unwrap();
+            w.data[0] = i as u8;
+            w.meta.size = PACKET_DATA_SIZE;
+            w.meta.set_addr(&addr);
+            msgs.push_back(b_);
+        }
+        s_responder.send(msgs).expect("send");
+
+        exit.store(true, Ordering::Relaxed);
+        t_receiver.join().expect("join");
+        t_responder.join().expect("join");
+        for t in threads {
+            t.join().expect("join");
+        }
+    }
+
 }
 
 #[cfg(all(feature = "unstable", test))]
diff --git a/src/ecdsa.rs b/src/ecdsa.rs
index c0a06646d02fa8..a1df2e93d4345e 100644
--- a/src/ecdsa.rs
+++ b/src/ecdsa.rs
@@ -135,8 +135,8 @@ mod tests {
     use ecdsa;
     use packet::{Packet, Packets, SharedPackets};
     use std::sync::RwLock;
-    use transaction::test_tx;
     use transaction::Transaction;
+    use transaction::test_tx;
 
     fn make_packet_from_transaction(tr: Transaction) -> Packet {
         let tx = serialize(&Request::Transaction(tr)).unwrap();
diff --git a/src/hash.rs b/src/hash.rs
index 61dd01468c9fcb..ee7598a0dc29e2 100644
--- a/src/hash.rs
+++ b/src/hash.rs
@@ -1,7 +1,7 @@
 //! The `hash` module provides functions for creating SHA-256 hashes.
 
-use generic_array::typenum::U32;
 use generic_array::GenericArray;
+use generic_array::typenum::U32;
 use sha2::{Digest, Sha256};
 
 pub type Hash = GenericArray<u8, U32>;
diff --git a/src/mint.rs b/src/mint.rs
index f3b6c5e598d635..2f385914deab0c 100644
--- a/src/mint.rs
+++ b/src/mint.rs
@@ -1,7 +1,7 @@
 //! The `mint` module is a library for generating the chain's genesis block.
 
-use entry::create_entry;
 use entry::Entry;
+use entry::create_entry;
 use event::Event;
 use hash::{hash, Hash};
 use ring::rand::SystemRandom;
diff --git a/src/result.rs b/src/result.rs
index 9b3c17a3695fde..63c9baa53b5705 100644
--- a/src/result.rs
+++ b/src/result.rs
@@ -1,5 +1,6 @@
 //! The `result` module exposes a Result type that propagates one of many different Error types.
 
+use accountant;
 use bincode;
 use serde_json;
 use std;
@@ -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
@@ -70,9 +77,9 @@ mod tests {
     use std::io;
     use std::io::Write;
     use std::net::SocketAddr;
-    use std::sync::mpsc::channel;
     use std::sync::mpsc::RecvError;
     use std::sync::mpsc::RecvTimeoutError;
+    use std::sync::mpsc::channel;
     use std::thread;
 
     fn addr_parse_error() -> Result<SocketAddr> {
diff --git a/src/signature.rs b/src/signature.rs
index 1b01e14ef579e8..5f3aee61ea2267 100644
--- a/src/signature.rs
+++ b/src/signature.rs
@@ -1,7 +1,7 @@
 //! The `signature` module provides functionality for public, and private keys.
 
-use generic_array::typenum::{U32, U64};
 use generic_array::GenericArray;
+use generic_array::typenum::{U32, U64};
 use ring::signature::Ed25519KeyPair;
 use ring::{rand, signature};
 use untrusted;
diff --git a/src/streamer.rs b/src/streamer.rs
index 33882c31dcffda..c081e24596d2c6 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>;
@@ -106,12 +106,12 @@ pub fn blob_receiver(
 
 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)?;
@@ -120,7 +120,7 @@ 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();
@@ -141,11 +141,11 @@ 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
@@ -183,11 +183,11 @@ 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 +196,21 @@ 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 +245,7 @@ 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 +450,21 @@ 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 +484,8 @@ 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 +503,8 @@ 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..b81a54941b599a 100644
--- a/src/subscribers.rs
+++ b/src/subscribers.rs
@@ -40,18 +40,19 @@ impl Node {
 
 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 +100,7 @@ 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 +117,7 @@ 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();