diff --git a/hbs2-peer/app/RPC2.hs b/hbs2-peer/app/RPC2.hs
index 832633f1..9913f9c9 100644
--- a/hbs2-peer/app/RPC2.hs
+++ b/hbs2-peer/app/RPC2.hs
@@ -59,6 +59,7 @@ import Data.HashSet (HashSet)
 import Data.HashSet qualified as HS
 import Data.IntMap qualified as IntMap
 import Data.IntMap (IntMap)
+import Data.List.Split qualified as Split
 import Data.Text qualified as Text
 import Data.Either
 import Data.Maybe
@@ -77,6 +78,7 @@ data DownloadError e =
    DownloadStuckError HashRef (Peer e)
  | StorageError
  | UnknownPeerError   (Peer e)
+ | InternalError Int
  | PeerMissBlockError HashRef (Peer e)
  | PeerBlockHashMismatch (Peer e)
  | PeerRequestTimeout (Peer e)
@@ -89,6 +91,7 @@ instance Pretty (Peer e) => Show (DownloadError e) where
   show (PeerRequestTimeout p)  = show $ parens $ "PeerRequestTimeout" <+> pretty p
   show (PeerBlockHashMismatch p)  = show $ parens $ "PeerBlockHashMismatch" <+> pretty p
   show StorageError  = show "StorageError"
+  show (InternalError n) = show $ parens "InternalError" <+> pretty n
 
 instance (Typeable e, Pretty (Peer e)) => Exception (DownloadError e)
 
@@ -170,18 +173,25 @@ downloadFromPeerRec :: forall e t cache m . ( e ~ L4Proto
                                             , BlockSizeCache e cache
                                             )
                  => Timeout t
+                 -> Int
                  -> cache
                  -> PeerEnv e
                  -> Hash HbSync
                  -> Peer e
                  -> m (Either (DownloadError e) ())
 
-downloadFromPeerRec t cache env h0 peer = do
+downloadFromPeerRec t bu0 cache env h0 peer = do
 
   sto <- withPeerM env getStorage
 
   q <- newTQueueIO
+  done <- newTVarIO (mempty :: HashSet (Hash HbSync))
 
+  atomically $ writeTQueue q h0
+
+  missed <- findMissedBlocks sto (HashRef h0)
+
+  mapM_ (atomically . writeTQueue q . coerce) missed
 
   flip runContT pure $ callCC \exit -> do
 
@@ -189,144 +199,58 @@ downloadFromPeerRec t cache env h0 peer = do
 
       mt <- atomically $ isEmptyTQueue q
 
-      when mt do
-        missed <- findMissedBlocks sto (HashRef h0)
-        mapM_ (atomically . writeTQueue q) missed
-
-      mt <- atomically $ isEmptyTQueue q
-
       when mt $ exit $ Right ()
 
       h <- atomically $ readTQueue q
 
-      w <- lift $ downloadFromPeer (TimeoutSec 5) cache env (coerce h) peer
+      here1 <- readTVarIO done <&> HS.member h
+
+      here2 <- hasBlock sto (coerce h) <&> isJust
+
+      when (here1 || here2) next
+
+      w <- lift $ downloadFromPeer (TimeoutSec 5) bu0 cache env (coerce h) peer
 
       case w of
         Right bs -> do
-          h <- enqueueBlock sto bs
-          pause @'Seconds 0.25
+          h' <- enqueueBlock sto bs
+          h3 <- ContT $ maybe1 h' (pure $ Left StorageError)
+          let refs = extractBlockRefs h3 bs
+          atomically $ mapM_ (writeTQueue q . coerce) refs
           next
 
         Left e -> do
-          err $ "DOWNLOAD ERROR" <+> pretty h
+          err $ "DOWNLOAD ERROR" <+> viaShow e
           -- pause @'Seconds 0.25
           next
 
+      missed <- findMissedBlocks sto (HashRef h0)
+
+      unless (L.null missed) do
+        mapM_ (atomically . writeTQueue q . coerce) missed
+        next
+
     pure $ Right ()
 
-  -- w <- newTVarIO (mempty :: HashSet (Hash HbSync) )
-  -- q <- newTQueueIO
-  -- p <- newTQueueIO
-
-  -- timeouts <- newTVarIO 0
-
-  -- sto <- withPeerM env getStorage
-
-  -- let addBlocks hx = atomically do
-  --       for_ hx $ \h -> do
-  --         writeTQueue q h
-  --         -- here <- readTVar w <&> HS.member h
-  --         -- unless here do
-  --           -- modifyTVar w (HS.insert h)
-
-  -- flip runContT pure do
-
-  --   atomically $ writeTQueue q h0
-
-  --   callCC \exit1 -> do
-
-  --     void $ ContT $ withAsync $ forever do
-  --       atomically do
-  --         (hx,bs) <- readTQueue p
-  --         let refs = extractBlockRefs hx bs
-  --         mapM (writeTQueue q) refs
-
-  --     fix \next -> do
-
-  --       h <- atomically do
-  --               h1 <- tryReadTQueue q
-  --               e  <- isEmptyTQueue p
-
-  --               case h1 of
-  --                 Just x              -> pure (Just x)
-  --                 Nothing | e         -> pure Nothing
-  --                         | otherwise -> retry
-
-  --       r <- case h of
-  --              Nothing -> exit1 okay
-  --              Just b  -> do
-  --                debug $ "BLOCK TO DOWNLOAD" <+> pretty b
-  --                missed <- findMissedBlocks sto (HashRef b)
-  --                addBlocks (fmap coerce missed)
-  --                blk <- getBlock sto b
-  --                case blk of
-  --                 Just bs -> pure (Right (b,bs))
-  --                 Nothing -> do
-  --                   debug $ "GO DOWNLOAD" <+> pretty b
-  --                   w <- lift (downloadFromPeer (TimeoutSec 20) cache env b peer)
-
-  --                   when (isLeft w) do
-  --                     addBlocks [b]
-
-  --                   pure $ fmap (b,) w
-
-  --       case r of
-  --         Left (PeerRequestTimeout{}) -> do
-  --           debug "DOWNLOAD STUCK!"
-  --           checkTimeout timeouts next (exit1 (Left $ DownloadStuckError (HashRef h0) peer))
-
-  --         Left (DownloadStuckError he pe) -> do
-  --           checkTimeout timeouts next (exit1 (Left $ DownloadStuckError he pe))
-
-  --         Left e -> exit1 (Left e)
-
-  --         Right (hx,bs) -> do
-  --           resetTimeouts timeouts
-  --           let refs = extractBlockRefs hx bs
-
-  --           for_ refs $ \z -> do
-  --             debug $ "PARSED REF" <+> pretty z
-
-  --           atomically $ mapM (writeTQueue q) refs
-  --           pause @'Seconds 0.01
-  --           -- atomically $ writeTQueue p (hx,bs)
-  --           next
-
-  --     pure okay
-
-  -- where
-
-  --   resetTimeouts timeouts = atomically $ writeTVar timeouts 0
-
-  --   checkTimeout timeouts n e = do
-  --     tn <- atomically do
-  --             modifyTVar timeouts succ
-  --             readTVar timeouts
-
-  --     if tn < 10 then n else e
-
-
-  --   okay = Right ()
-
-
 downloadFromPeer :: forall e t cache m . ( e ~ L4Proto
                                          , MonadUnliftIO m
                                          , IsTimeout t
                                          , BlockSizeCache e cache
                                          )
                  => Timeout t
+                 -> Int
                  -> cache
                  -> PeerEnv e
                  -> Hash HbSync
                  -> Peer e
                  -> m (Either (DownloadError e) ByteString)
 
-downloadFromPeer t cache env h peer = liftIO $ withPeerM env do
+downloadFromPeer t bu cache env h peer = liftIO $ withPeerM env do
 
   pd@PeerData{..} <- find (KnownPeerKey peer) id
                    >>= orThrow (UnknownPeerError peer)
 
-  sto <- liftIO $ withPeerM env $ getStorage
+  sto <- getStorage
 
   let chunkSize = defChunkSize
 
@@ -343,46 +267,39 @@ downloadFromPeer t cache env h peer = liftIO $ withPeerM env do
               . set sBlockSize (fromIntegral size)
                 $ down
 
-    eblk <- liftIO $ withPeerM env do
-      update @e new key id
+    lift $ update @e new key id
 
-      request peer (BlockChunks @e coo (BlockGetAllChunks h chunkSize))
+    let offsets = calcChunks size (fromIntegral chunkSize)  :: [(Offset, Size)]
 
-      let total = L.length $ calcChunks size (fromIntegral chunkSize)
+    let chunkNums = [ 0 .. pred (length offsets) ]
 
-      flip runContT pure do
+    let bursts = calcBursts bu chunkNums
+
+    callCC $ \exit2 -> do
+
+      for_ bursts $ \(i,chunkN) -> do
+        let req = BlockChunks @e coo (BlockGetChunks h chunkSize (fromIntegral i) (fromIntegral chunkN))
+        lift $ request peer req
+
+        r <- liftIO $ race (pause t) do
 
-        worker <- ContT $ withAsync do
           atomically do
-            wtf <- readTVar _sBlockChunks2
-            unless (IntMap.size wtf >= total) retry
-            pure wtf
+             -- readTQueue chuQ
+             pieces <- readTVar _sBlockChunks2
+             let done = and [ IntMap.member j pieces | j <- [i .. i + chunkN-1] ]
+             unless done retry
 
-        waiter <- ContT $ withAsync $ fix \next -> do
-           r <- race (pause t) (atomically $ readTQueue chuQ)
-           case r of
-            Left{}  -> cancel worker
-            Right{} -> next
+        atomically $ flushTQueue chuQ
 
-        result <- waitCatch worker
-
-        void $ ContT $ bracket none $ const do
-          cancel waiter
-          atomically $ flushTQueue chuQ
-          expire @e key
-
-        pure result
-
-    callCC \exit2 -> do
-
-      blk <- case eblk of
-              Right x -> pure x
-              Left{}  -> exit2 (Left (PeerRequestTimeout peer))
+        either (const $ exit2 (Left $ DownloadStuckError (HashRef h) peer) ) pure r
 
+      blk <- readTVarIO _sBlockChunks2
       let rs = LBS.concat $ IntMap.elems blk
 
       ha <- enqueueBlock sto rs
 
+      lift $ expire @e key
+
       case ha of
         Nothing -> pure $ Left StorageError
 
@@ -442,26 +359,32 @@ instance (e ~ L4Proto, MonadUnliftIO m, HasRpcContext PeerAPI RPC2Context m) =>
 
           _ -> pure nil
 
+        entry $ bindMatch "query-block-from-peer:rec" $ \syn -> do
 
-        entry $ bindMatch "query-block-from-peer:rec" \case
-          [ HashLike blk, StringLike addr ] -> flip runContT pure $ callCC \exit -> do
+          flip runContT pure $ callCC \exit -> do
 
-            peer' <- liftIO $ try @_ @SomeException do
-                      let pa = fromString @(PeerAddr L4Proto) addr
-                      fromPeerAddr pa
+            (blk,addr,bu0) <- case syn of
+                    [ HashLike blk, StringLike addr ] -> pure (blk, addr, 4)
+                    [ HashLike blk, StringLike addr, LitIntVal x ] -> pure (blk, addr, fromIntegral x)
 
-            peer <- either (const $ exit (mkSym "error:invalid-address")) pure peer'
+                    _ -> exit nil
 
-            what <- lift $ downloadFromPeerRec defChunkWaitMax rpcBrains rpcPeerEnv (coerce blk) peer
+            callCC \exit2 -> do
 
-            case what of
-              Left e   -> pure $ mkList @C [ mkSym "error" , mkStr (show e) ]
-              Right{}  -> pure $ mkList @C [ mkSym "okay" ]
+              peer' <- liftIO $ try @_ @SomeException do
+                        let pa = fromString @(PeerAddr L4Proto) addr
+                        fromPeerAddr pa
 
-          _ -> pure nil
+              peer <- either (const $ exit2 (mkSym "error:invalid-address")) pure peer'
+
+              what <- lift $ downloadFromPeerRec defChunkWaitMax bu0 rpcBrains rpcPeerEnv (coerce blk) peer
+
+              case what of
+                Left e   -> pure $ mkList @C [ mkSym "error" , mkStr (show e) ]
+                Right{}  -> pure $ mkList @C [ mkSym "okay" ]
 
         entry $ bindMatch "query-block-from-peer" \case
-          [ HashLike blk, StringLike addr ] -> flip runContT pure $ callCC \exit -> do
+          ( HashLike blk :StringLike addr : opts) -> flip runContT pure $ callCC \exit -> do
 
             peer' <- liftIO $ try @_ @SomeException do
                       let pa = fromString @(PeerAddr L4Proto) addr
@@ -469,7 +392,7 @@ instance (e ~ L4Proto, MonadUnliftIO m, HasRpcContext PeerAPI RPC2Context m) =>
 
             peer <- either (const $ exit (mkSym "error:invalid-address")) pure peer'
 
-            what <- lift $ downloadFromPeer defChunkWaitMax rpcBrains rpcPeerEnv (coerce blk) peer
+            what <- lift $ downloadFromPeer defChunkWaitMax 4 rpcBrains rpcPeerEnv (coerce blk) peer
 
             case what of
               Left e   -> pure $ mkList @C [ mkSym "error" , mkStr (show e) ]