diff --git a/hbs2-peer/app/BlockDownload.hs b/hbs2-peer/app/BlockDownload.hs
index 893c1928..574f0404 100644
--- a/hbs2-peer/app/BlockDownload.hs
+++ b/hbs2-peer/app/BlockDownload.hs
@@ -853,46 +853,3 @@ processBlock h = do
       unboxBundleRef (BundleRefValue box) = unboxSignedBox0 box
 
 
--- NOTE: this is an adapter for a ResponseM monad
---       because response is working in ResponseM monad (ha!)
---       So don't be confused with types
---
-mkAdapter :: forall e m . ( m ~  PeerM e IO
-                          , HasProtocol e (BlockChunks e)
-                          , Hashable (SessionKey e (BlockChunks e))
-                          , Sessions e (BlockChunks e) (ResponseM e m)
-                          , Typeable (SessionKey e (BlockChunks e))
-                          , EventEmitter e (BlockChunks e) m
-                          , Pretty (Peer e)
-                          )
-          => m (BlockChunksI e (ResponseM e m ))
-mkAdapter = do
-  storage <- getStorage
-  pure $
-    BlockChunksI
-    { blkSize     = liftIO . hasBlock storage
-    , blkChunk    = \h o s -> liftIO (getChunk storage h o s)
-    , blkGetHash  = \c -> find (DownloadSessionKey @e c) (view sBlockHash)
-
-    , blkAcceptChunk = \(c,p,h,n,bs) -> void $ runMaybeT $ do
-        let cKey = DownloadSessionKey (p,c)
-
-        dodo <- lift $ find cKey (view sBlockChunks)
-
-        unless (isJust dodo) $ do
-          debug $ "session lost for peer !" <+> pretty p
-
---        debug $ "FINDING-SESSION:" <+> pretty c <+> pretty n
---        debug $ "GOT SHIT" <+> pretty c <+> pretty n
-
-        se <- MaybeT $ find cKey id
-        let dwnld  = view sBlockChunks se
-        let dwnld2 = view sBlockChunks2 se
-
-        -- debug $ "WRITE SHIT" <+> pretty c <+> pretty n
-        liftIO $ atomically do
-          writeTQueue dwnld (n, bs)
-          modifyTVar' dwnld2 (IntMap.insert (fromIntegral n) bs)
-    }
-
-
diff --git a/hbs2-peer/app/BlockDownloadNew.hs b/hbs2-peer/app/BlockDownloadNew.hs
new file mode 100644
index 00000000..4fc4ba37
--- /dev/null
+++ b/hbs2-peer/app/BlockDownloadNew.hs
@@ -0,0 +1,554 @@
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+{-# Language UndecidableInstances #-}
+{-# Language AllowAmbiguousTypes #-}
+module BlockDownloadNew where
+
+import HBS2.Prelude.Plated
+import HBS2.OrDie
+import HBS2.Data.Detect
+import HBS2.Hash
+import HBS2.Merkle
+import HBS2.Defaults
+import HBS2.Events
+import HBS2.Net.Proto.Service
+import HBS2.Net.Proto.Sessions
+
+
+import HBS2.Base58
+import HBS2.Data.Types.Peer
+import HBS2.Data.Types.Refs
+import HBS2.Actors.Peer
+import HBS2.Peer.Proto.Peer
+import HBS2.Peer.Proto.BlockInfo
+import HBS2.Peer.Proto.BlockChunks
+import HBS2.Peer.Brains
+import HBS2.Storage
+import HBS2.Storage.Operations.Missed
+import HBS2.Misc.PrettyStuff
+import HBS2.Clock
+import HBS2.Net.Auth.Schema
+
+import HBS2.Peer.RPC.Internal.Types
+import HBS2.Peer.RPC.API.Peer
+
+import HBS2.Net.Messaging.TCP
+
+import PeerTypes
+import PeerInfo
+
+import Control.Monad.Trans.Maybe
+import Control.Monad.Trans.Cont
+import Control.Concurrent.STM (flushTQueue,retry)
+import Data.Map qualified as Map
+import Data.Map (Map)
+import Data.HashMap.Strict (HashMap)
+import Data.HashMap.Strict qualified as HM
+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
+import Data.ByteString.Lazy qualified as LBS
+import Data.ByteString.Lazy (ByteString)
+import Data.ByteString qualified as BS
+import Data.List qualified as L
+import Data.Coerce
+import Numeric
+import UnliftIO
+import UnliftIO.Concurrent
+import Lens.Micro.Platform
+import Streaming.Prelude qualified as S
+
+
+data DownloadError e =
+   DownloadStuckError HashRef (Peer e)
+ | StorageError
+ | UnknownPeerError   (Peer e)
+ | InternalError Int
+ | PeerMissBlockError HashRef (Peer e)
+ | PeerBlockHashMismatch (Peer e)
+ | PeerRequestTimeout (Peer e)
+ | Incomplete HashRef
+  deriving stock (Generic,Typeable)
+
+instance Pretty (Peer e) => Show (DownloadError e) where
+  show (DownloadStuckError h p)  = show $ parens $ "DownloadStuck" <+> pretty h <+> pretty p
+  show (UnknownPeerError p)  = show $ parens $ "UnknownPeerError" <+> pretty p
+  show (PeerMissBlockError h p)  = show $ parens $ "PeerMissBlockError" <+> pretty h <+> pretty p
+  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
+  show (Incomplete h) = show $ parens "Incomplete" <+> pretty h
+
+instance (Typeable e, Pretty (Peer e)) => Exception (DownloadError e)
+
+
+class BlockSizeCache e cache where
+
+  cacheBlockSize :: forall m . MonadUnliftIO m
+                 => cache
+                 -> PubKey 'Sign (Encryption e)
+                 -> Hash HbSync
+                 -> Integer
+                 -> m ()
+
+  findBlockSize :: forall m . MonadUnliftIO m
+                => cache
+                -> PubKey 'Sign (Encryption e)
+                -> Hash HbSync
+                -> m (Maybe Integer)
+
+instance BlockSizeCache e () where
+  cacheBlockSize _ _ _ _ = pure ()
+  findBlockSize _ _ _ = pure Nothing
+
+instance BlockSizeCache e (SomeBrains e) where
+  cacheBlockSize = brainsCacheBlockSize @e
+  findBlockSize = brainsFindBlockSize @e
+
+queryBlockSizeFromPeer :: forall e cache m . ( e ~ L4Proto
+                                             , MonadUnliftIO m
+                                             , BlockSizeCache e cache
+                                             )
+                 => cache
+                 -> PeerEnv e
+                 -> Hash HbSync
+                 -> Peer e
+                 -> m (Either (DownloadError e) (Maybe Integer))
+
+queryBlockSizeFromPeer cache e h peer = do
+
+  what <- try @_ @(DownloadError e) $ liftIO $ withPeerM e do
+
+    flip runContT pure $ callCC \exit -> do
+
+      PeerData{..} <- lift $ find (KnownPeerKey peer) id
+                       >>= orThrow (UnknownPeerError peer)
+
+      s <- lift $ findBlockSize @e cache _peerSignKey h
+
+      debug $ "FOUND CACHED VALUE" <+> pretty h <+> pretty s
+
+      maybe none (exit . Just) s
+
+      lift do
+
+        sizeQ <- newTQueueIO
+
+        subscribe @e (BlockSizeEventKey peer) $ \case
+          BlockSizeEvent (that, hx, sz) | hx == h -> do
+            atomically $ writeTQueue sizeQ (Just sz)
+            cacheBlockSize @e cache _peerSignKey h sz
+
+          _ -> do
+            atomically $ writeTQueue sizeQ Nothing
+
+        request peer (GetBlockSize @e h)
+
+        race ( pause defBlockInfoTimeout ) (atomically $ readTQueue sizeQ )
+           >>= orThrow (PeerRequestTimeout peer)
+
+  case what of
+    Left{}  -> pure $ Left (PeerRequestTimeout peer)
+    Right x -> pure (Right x)
+
+
+data BurstMachine =
+  BurstMachine
+  { _buTimeout  :: Double
+  , _buBurstMax :: Int
+  , _buStepUp   :: Double
+  , _buStepDown :: Double
+  , _buCurrent  :: TVar Double
+  , _buErrors   :: TVar Int
+  }
+
+burstMachineAddErrors :: MonadUnliftIO m => BurstMachine -> Int -> m ()
+burstMachineAddErrors BurstMachine{..} n =
+  atomically $ modifyTVar _buErrors (+n)
+
+newBurstMachine :: MonadUnliftIO m
+                => Double      -- ^ timeout
+                -> Int         -- ^ max burst
+                -> Maybe Int   -- ^ start burst
+                -> Double      -- ^ step up
+                -> Double      -- ^ step down
+                -> m BurstMachine
+
+newBurstMachine t0 buMax buStart up' down' = do
+  BurstMachine t0 buMax up down
+    <$> newTVarIO bu0
+    <*> newTVarIO 0
+
+  where
+    bu0 = realToFrac $ fromMaybe (max 2 (buMax `div` 2)) buStart
+    down = min 0.85 down'
+    up   = min 0.5 up'
+
+getCurrentBurst :: MonadUnliftIO m => BurstMachine -> m Int
+getCurrentBurst BurstMachine{..} = readTVarIO _buCurrent <&> round
+
+runBurstMachine :: MonadUnliftIO m
+                => BurstMachine
+                -> m ()
+
+runBurstMachine BurstMachine{..} = do
+
+
+  bu0  <- readTVarIO _buCurrent <&> realToFrac
+  let buMax = realToFrac _buBurstMax
+  let down  = _buStepDown
+  let up    = _buStepUp
+
+  _dEdT <- newTVarIO 0.00
+
+  _rates <- newTVarIO (mempty :: Map Double Double)
+
+  _buMaxReal <- newTVarIO buMax
+
+  pause @'Seconds (realToFrac _buTimeout)
+
+  flip runContT pure do
+
+    void $ ContT $ withAsync do
+      forever do
+        pause @'Seconds (realToFrac _buTimeout * 10)
+
+        atomically do
+          e <- headDef bu0 . Map.elems <$> readTVar _rates
+          nrates <- readTVar _rates <&> take 100 . Map.toList
+          writeTVar _rates (Map.fromList nrates)
+          modifyTVar _buMaxReal (max e)
+
+    void $ ContT $ withAsync do
+      forever do
+        pause @'Seconds 600
+        atomically $ writeTVar _buMaxReal buMax
+
+
+    void $ ContT $ withAsync do
+      forever do
+        pause @'Seconds (realToFrac _buTimeout * 2.0)
+        ddt <- readTVarIO _dEdT
+
+        when (ddt <= 0) do
+          atomically do
+            buMaxReal <- readTVar _buMaxReal
+            current <- readTVar _buCurrent
+            let new =  min buMaxReal (current * (1.0 + up))
+            writeTVar _buCurrent new
+
+    flip fix 0 $ \next e1 -> do
+
+      let dt = realToFrac _buTimeout
+
+      eNew <- atomically do
+
+        e2      <- readTVar _buErrors
+        current <- readTVar _buCurrent
+
+        new <- if e2 > e1 then do
+                    let d = max 2.0 (current * (1.0 - down))
+                    nrates <- readTVar _rates <&> drop 3 . Map.toList
+                    let newFucked = maybe d snd (headMay nrates)
+                    writeTVar _rates (Map.fromList nrates)
+                    pure newFucked
+
+                  else
+                    pure current -- $ min buMaxReal (current * (1.0 + up))
+
+        writeTVar _buErrors 0
+        writeTVar _buCurrent new
+
+        let dedt = realToFrac (e2 - e1) / realToFrac dt
+
+        writeTVar _dEdT (realToFrac dedt)
+
+        modifyTVar _rates ( Map.insertWith max dedt current )
+
+        pure e2
+
+      pause @'Seconds dt
+      next eNew
+
+data S =
+    SInit
+  | SFetchQ
+  | SFetchPost (Hash HbSync) ByteString
+  | SCheckBefore
+  | SCheckAfter
+
+-- | downloads block with dependencies recursively
+downloadFromPeerRec :: 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) ())
+
+downloadFromPeerRec t bu0 cache env h0 peer = do
+
+  sto <- withPeerM env getStorage
+
+  p <- newTQueueIO
+  q <- newTQueueIO
+  qq <- newTQueueIO
+  toq <- newTVarIO ( mempty :: [Int] )
+
+  bm <- newBurstMachine 0.5 256 (Just bu0) 0.05 0.10
+
+  flip runContT pure do
+
+    ContT $ withAsync $ forever do
+      join $ atomically (readTQueue p)
+
+    ContT $ withAsync $ forever do
+      h <- atomically (readTQueue qq)
+      void $ queryBlockSizeFromPeer cache env h peer
+      pause @'Seconds 1.5
+
+    ContT $ withAsync $ flip fix 10000000 $ \next m0 -> do
+      txs <- readTVarIO toq <&> L.take 1000
+      let m1 = fromMaybe m0 $ median txs
+      when ( m1 > m0 ) $ burstMachineAddErrors bm 1
+      pause @'Seconds 3
+      next m1
+
+    ContT $ withAsync $ runBurstMachine bm
+
+    flip fix SInit $ \next -> \case
+
+      SInit -> do
+        debug "SInit"
+        atomically $ writeTQueue q h0
+        next SCheckBefore
+
+      SCheckBefore -> do
+        here <- hasBlock sto h0 <&> isJust
+        if here then next SCheckAfter else next SFetchQ
+
+      SFetchQ -> do
+        debug "SFetchQ"
+
+        done <- atomically do
+          pe <- isEmptyTQueue p
+          qe <- isEmptyTQueue q
+          when (qe && not pe) retry
+          -- when (not pe) retry
+          pure qe
+
+        if done then
+          next SCheckAfter
+        else do
+
+          h <- atomically $ readTQueue q
+          mbs <- getBlock sto h
+
+          case mbs of
+            Just bs -> next (SFetchPost h bs)
+            Nothing -> none
+
+          bu <- lift $ getCurrentBurst bm
+
+          t0 <- getTimeCoarse
+          w  <- lift $ downloadFromPeer t bu cache env (coerce h) peer
+          t1 <- getTimeCoarse
+          let dt = toMicroSeconds $ TimeoutTS (t1 - t0)
+          atomically $ modifyTVar toq ( dt : )
+
+          case w of
+            Right bs -> do
+              next (SFetchPost h bs)
+
+            Left e -> do
+             lift $ burstMachineAddErrors bm 1
+             err $ "DOWNLOAD ERROR" <+> viaShow e
+             next SFetchQ
+
+      SFetchPost h bs -> do
+        debug $ "SFetchPost" <+> pretty h
+
+        let parse = do
+             let refs = extractBlockRefs h bs
+             atomically $ mapM_ (writeTQueue q . coerce) refs
+             mapM_ (atomically . writeTQueue qq . coerce) refs
+
+        atomically $ writeTQueue p parse
+
+        next SFetchQ
+
+      SCheckAfter -> do
+        debug "SCheckAfter"
+        missed <- findMissedBlocks sto (HashRef h0)
+        mapM_ (atomically . writeTQueue q . coerce) missed
+        mapM_ (atomically . writeTQueue qq . coerce) missed
+        unless (L.null missed) $ next SFetchQ
+
+    pure $ 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 bu cache env h peer = liftIO $ withPeerM env do
+
+  pd@PeerData{..} <- find (KnownPeerKey peer) id
+                   >>= orThrow (UnknownPeerError peer)
+
+  pinfo <- find (PeerInfoKey peer) id
+             >>= orThrow (UnknownPeerError peer)
+
+  rtt <- liftIO $ medianPeerRTT pinfo
+             <&> fmap ((*1) . realToFrac)
+             <&> fromMaybe 1000
+             <&> (/1e6)
+
+  let waity = 10 * rtt
+
+  sto <- getStorage
+
+  let chunkSize = defChunkSize
+
+  flip runContT pure $ callCC \exit -> do
+
+    size <- lift (findBlockSize @e cache _peerSignKey h)
+             >>= maybe (queryBlockSize exit) pure
+
+    coo <- genCookie (peer,h)
+    let key = DownloadSessionKey (peer, coo)
+    down@BlockDownload{..} <- newBlockDownload h
+    let chuQ = _sBlockChunks
+    let new =   set sBlockChunkSize chunkSize
+              . set sBlockSize (fromIntegral size)
+                $ down
+
+    lift $ update @e new key id
+
+    let offsets = calcChunks size (fromIntegral chunkSize)  :: [(Offset, Size)]
+
+    let chunkNums = [ 0 .. pred (length offsets) ]
+
+    let bursts = calcBursts bu chunkNums
+
+    callCC $ \exit2 -> do
+
+      _wx <- newTVarIO waity
+
+      for_ bursts $ \(i,chunkN) -> do
+
+        -- atomically $ flushTQueue chuQ
+
+        let req = BlockChunks @e coo (BlockGetChunks h chunkSize (fromIntegral i) (fromIntegral chunkN))
+
+        lift $ request peer req
+
+        t0 <- getTimeCoarse
+
+        let watchdog = fix \next -> do
+             wx <- readTVarIO _wx <&> realToFrac
+             -- debug $ "WATCHDOG" <+> pretty wx <+> pretty waity
+             r <- race (pause @'MilliSeconds (min wx waity)) do
+                    void $ atomically $ readTQueue chuQ
+             either (const none) (const next) r
+
+        r <- liftIO $ race watchdog do
+
+          atomically do
+            pieces <- readTVar _sBlockChunks2
+            let done  = and [ IntMap.member j pieces | j <- [i .. i + chunkN-1] ]
+            unless done retry
+
+        atomically $ flushTQueue chuQ
+
+        t1 <- getTimeCoarse
+
+        atomically do
+          wx0 <- readTVar _wx
+          let wx1 = realToFrac (t1 - t0) * 100 / 1e6 -- millis
+          writeTVar _wx wx1
+
+        case r of
+          Left{} -> exit2 (Left $ DownloadStuckError (HashRef h) peer)
+          _ -> pure ()
+
+
+      blk <- readTVarIO _sBlockChunks2
+      let rs = LBS.concat $ IntMap.elems blk
+
+      ha <- putBlock sto rs
+
+      -- let ha = Just $ hashObject @HbSync rs
+
+      lift $ expire @e key
+
+      case ha of
+        Nothing -> pure $ Left StorageError
+
+        Just h1 | h1 == h -> do
+          pure $ Right rs
+
+        Just h1 -> do
+          delBlock sto h1
+          pure $ Left (PeerBlockHashMismatch peer)
+
+  where
+
+    queryBlockSize exit = do
+      what <- lift $ queryBlockSizeFromPeer cache env h peer
+      case what of
+        Left{}  -> exit (Left (PeerRequestTimeout peer))
+        Right Nothing -> exit (Left (PeerMissBlockError (HashRef h) peer))
+        Right (Just s) -> pure s
+
+
+
+downloadDispatcher :: forall e m . ( e ~ L4Proto
+                                   , MonadUnliftIO m
+                                   )
+                 => PeerEnv e
+                 -> m ()
+downloadDispatcher env = flip runContT pure do
+
+  pts <- newTVarIO ( mempty :: HashMap (Peer e) (Async ()) )
+
+  ContT $ bracket none $ const do
+    readTVarIO pts >>= mapM_ cancel
+    atomically $ writeTVar pts mempty
+
+  liftIO $ withPeerM env do
+    subscribe @e DownloadReqKey $ \(DownloadReqData h) -> do
+      debug $ green "Download request" <+> pretty h
+
+  pause @'Seconds 1
+
+  ContT $ withAsync $ withPeerM env $ forever do
+    pips <- getKnownPeers @e
+    for_ pips $ \p -> do
+      debug $ "downloadDispatcher: knownPeer" <+> yellow (pretty p)
+
+    pause @'Seconds 5
+
+  forever do
+    pause @'Seconds 10
+    debug $ yellow $ "I'm download dispatcher"
+
+
diff --git a/hbs2-peer/app/CheckBlockAnnounce.hs b/hbs2-peer/app/CheckBlockAnnounce.hs
index 2450de35..2c350eb6 100644
--- a/hbs2-peer/app/CheckBlockAnnounce.hs
+++ b/hbs2-peer/app/CheckBlockAnnounce.hs
@@ -13,8 +13,6 @@ import HBS2.Net.Proto.Types
 import PeerTypes
 import PeerConfig
 import CheckPeer (peerBanned)
-import BlockDownload()
-import DownloadQ()
 
 import Control.Monad.Trans.Maybe
 import Control.Monad.Reader
@@ -90,13 +88,13 @@ checkBlockAnnounce :: forall e m . ( e ~ L4Proto
                                    , m ~ PeerM e IO
                                    )
                    => PeerConfig
-                   -> DownloadEnv e
+                   -> PeerEnv e
                    -> PeerNonce
                    -> PeerAddr e
                    -> Hash HbSync
                    -> m ()
 
-checkBlockAnnounce conf denv nonce pa h = void $ runMaybeT do
+checkBlockAnnounce conf penv nonce pa h = void $ runMaybeT do
 
   accept <- lift $ acceptAnnouncesFromPeer conf pa
 
@@ -108,8 +106,6 @@ checkBlockAnnounce conf denv nonce pa h = void $ runMaybeT do
 
   guard accept
 
-  lift do
-    withDownload denv $ do
-      -- TODO: use-brains-to-download-direct
-      addDownload Nothing h
+  liftIO $ withPeerM penv do
+      addDownload @e Nothing h
 
diff --git a/hbs2-peer/app/DownloadQ.hs b/hbs2-peer/app/DownloadQ.hs
deleted file mode 100644
index 315aa55c..00000000
--- a/hbs2-peer/app/DownloadQ.hs
+++ /dev/null
@@ -1,53 +0,0 @@
-{-# Language AllowAmbiguousTypes #-}
-module DownloadQ where
-
-import HBS2.Prelude
-import HBS2.Clock
-import HBS2.Events
-import HBS2.Data.Types.Refs
-import HBS2.Net.PeerLocator
-import HBS2.Peer.Brains
-import HBS2.Storage
-import HBS2.Storage.Operations.Missed
-
-import PeerTypes
-import PeerConfig
-
-import Data.Foldable
-import Control.Monad
-import Lens.Micro.Platform
-
-downloadQueue :: forall e m . ( MyPeer e
-                              , DownloadFromPeerStuff e m
-                              , HasPeerLocator e (BlockDownloadM e m)
-                              , HasPeerLocator e m
-                              , EventListener e (DownloadReq e) m
-                              , HasStorage m
-                              ) => PeerConfig
-                                -> SomeBrains e
-                                -> DownloadEnv e -> m ()
-
-downloadQueue _ brains denv = do
-  debug "DownloadQ started"
-
-  down <- listDownloads @e brains
-  sto <- getStorage
-
-  withDownload denv do
-    forM_ down $ \(HashRef h,_)  -> do
-      missed <- findMissedBlocks sto (HashRef h)
-      for_ missed $ \h -> do
-        debug $ "DownloadQ:" <+> pretty h
-        addDownload mzero (fromHashRef h)
-
-  -- FIXME: timeout-hardcodes
-  let refs = listDownloads @e brains <&> fmap (set _2 30)
-
-  polling (Polling 5 20) refs $ \ref -> do
-    missed <- findMissedBlocks sto ref
-    trace $ "DownloadQ. check" <+> pretty ref <+> pretty (length missed)
-
-    when (null missed) do
-      delDownload @e brains ref
-
-
diff --git a/hbs2-peer/app/Fetch.hs b/hbs2-peer/app/Fetch.hs
index 2096ebd9..ba91a62f 100644
--- a/hbs2-peer/app/Fetch.hs
+++ b/hbs2-peer/app/Fetch.hs
@@ -2,28 +2,27 @@ module Fetch where
 
 import HBS2.Prelude
 import HBS2.Actors.Peer
+import HBS2.Events
 import HBS2.Data.Types.Refs
 import HBS2.Storage.Operations.Missed
 import HBS2.Net.Proto.Types
 
 import PeerTypes
-import BlockDownload
 
-import Data.Foldable (for_)
-
-fetchHash :: forall e m . (e ~ L4Proto, MonadIO m)
+fetchHash :: forall e m . ( e ~ L4Proto
+                          , MonadIO m
+                          )
       => PeerEnv e
-      -> DownloadEnv e
       -> HashRef
       -> m ()
 
-fetchHash penv denv href  = do
+fetchHash penv href  = do
   debug  $ "fetchAction" <+> pretty h
   liftIO $ withPeerM penv $ do
     sto <- getStorage
     missed <- findMissedBlocks sto href
     for_ missed $ \miss -> do
-      withDownload denv (addDownload Nothing (fromHashRef miss))
+       addDownload @e Nothing (fromHashRef miss)
 
   where
     h = fromHashRef href
diff --git a/hbs2-peer/app/HttpWorker.hs b/hbs2-peer/app/HttpWorker.hs
index 6c8dc16f..a581d855 100644
--- a/hbs2-peer/app/HttpWorker.hs
+++ b/hbs2-peer/app/HttpWorker.hs
@@ -84,9 +84,9 @@ httpWorker :: forall e s m . ( MyPeer e
                              , m ~ PeerM e IO
                              , e ~ L4Proto
                              -- , ForLWWRefProto e
-                             ) => PeerConfig -> AnnMetaData -> DownloadEnv e -> m ()
+                             ) => PeerConfig -> AnnMetaData -> m ()
 
-httpWorker (PeerConfig syn) pmeta e = do
+httpWorker (PeerConfig syn) pmeta = do
 
   sto <- getStorage
   let port' = runReader (cfgValue @PeerHttpPortKey) syn  <&>  fromIntegral
diff --git a/hbs2-peer/app/MailboxProtoWorker.hs b/hbs2-peer/app/MailboxProtoWorker.hs
index 0f49f57c..e99db49e 100644
--- a/hbs2-peer/app/MailboxProtoWorker.hs
+++ b/hbs2-peer/app/MailboxProtoWorker.hs
@@ -42,7 +42,6 @@ import HBS2.Misc.PrettyStuff
 import Brains
 import PeerConfig
 import PeerTypes
-import BlockDownload()
 
 import DBPipe.SQLite as Q
 
@@ -125,7 +124,6 @@ instance ForMailbox s => Hashable (MailboxDownload s)
 data MailboxProtoWorker (s :: CryptoScheme) e =
   MailboxProtoWorker
   { mpwPeerEnv            :: PeerEnv e
-  , mpwDownloadEnv        :: DownloadEnv e
   , mpwStorage            :: AnyStorage
   , mpwCredentials        :: PeerCredentials s
   , mpwFetchQ             :: TVar (HashSet (MailboxRefKey s))
@@ -457,7 +455,7 @@ startDownloadStuff :: forall s e m . (ForMailbox s, s ~ Encryption e, MyPeer e,
               -> m ()
 
 startDownloadStuff MailboxProtoWorker{..} href = do
-  liftIO $ withPeerM mpwPeerEnv $ withDownload mpwDownloadEnv
+  liftIO $ withPeerM mpwPeerEnv
     $ do
       debug $ "startDownloadStuff" <+> pretty href
       addDownload @e Nothing (coerce href)
@@ -552,13 +550,12 @@ createMailboxProtoWorker :: forall s e m . ( MonadIO m
                                            )
                          => PeerCredentials s
                          -> PeerEnv e
-                         -> DownloadEnv e
                          -> AnyStorage
                          -> m (MailboxProtoWorker s e)
-createMailboxProtoWorker pc pe de sto = do
+createMailboxProtoWorker pc pe sto = do
   -- FIXME: queue-size-hardcode
   --   $class: hardcode
-  MailboxProtoWorker pe de sto pc
+  MailboxProtoWorker pe sto pc
     <$> newTVarIO mempty
     <*> newTBQueueIO 8000
     <*> newTVarIO mempty
diff --git a/hbs2-peer/app/PeerMain.hs b/hbs2-peer/app/PeerMain.hs
index d091876d..1043cbff 100644
--- a/hbs2-peer/app/PeerMain.hs
+++ b/hbs2-peer/app/PeerMain.hs
@@ -44,10 +44,9 @@ import Brains
 import BrainyPeerLocator
 import ByPassWorker
 import PeerTypes hiding (info)
-import BlockDownload
+import BlockDownloadNew
 import CheckBlockAnnounce (checkBlockAnnounce)
 import CheckPeer (peerBanned)
-import DownloadQ
 import PeerInfo
 import PeerConfig
 import Bootstrap
@@ -836,11 +835,6 @@ runPeer opts = respawnOnError opts $ do
 
   brainsThread <- async $ runBasicBrains conf brains
 
-  denv <- newDownloadEnv brains
-
-  dProbe <- newSimpleProbe "BlockDownload"
-  addProbe dProbe
-  downloadEnvSetProbe denv dProbe
 
   pl <- AnyPeerLocator <$> newBrainyPeerLocator @e (SomeBrains @e brains) mempty
 
@@ -956,7 +950,7 @@ runPeer opts = respawnOnError opts $ do
     pause @'Seconds 600
     liftIO $ Cache.purgeExpired nbcache
 
-  rce <- refChanWorkerEnv conf penv denv refChanNotifySource
+  rce <- refChanWorkerEnv conf penv refChanNotifySource
 
   rcwProbe <- newSimpleProbe "RefChanWorker"
   addProbe rcwProbe
@@ -987,7 +981,7 @@ runPeer opts = respawnOnError opts $ do
 
   rcw <- async $ liftIO $ runRefChanRelyWorker rce refChanAdapter
 
-  mailboxWorker <- createMailboxProtoWorker pc  penv denv (AnyStorage s)
+  mailboxWorker <- createMailboxProtoWorker pc  penv (AnyStorage s)
 
   p <- newSimpleProbe "MailboxProtoWorker"
   mailboxProtoWorkerSetProbe mailboxWorker p
@@ -1002,7 +996,7 @@ runPeer opts = respawnOnError opts $ do
             when (Set.member pk helpFetchKeys) do
               liftIO $ Cache.insert nbcache (p,h) ()
               -- debug  $ "onNoBlock" <+> pretty p <+> pretty h
-              withPeerM penv $ withDownload denv (addDownload mzero h)
+              liftIO $ withPeerM penv $ addDownload @e mzero h
 
   loop <- liftIO $ async do
 
@@ -1014,10 +1008,10 @@ runPeer opts = respawnOnError opts $ do
               let doDownload h = do
                     pro <- isReflogProcessed @e brains h
                     if pro then do
-                      withPeerM penv $ withDownload denv (addDownload mzero h)
+                      withPeerM penv $ addDownload @e mzero h
                     else do
                       -- FIXME: separate-process-to-mark-logs-processed
-                      withPeerM penv $ withDownload denv (addDownload Nothing h)
+                      withPeerM penv $ addDownload @e Nothing h
 
               let doFetchRef puk = do
                    withPeerM penv $ do
@@ -1064,7 +1058,7 @@ runPeer opts = respawnOnError opts $ do
 
               subscribe @e BlockAnnounceInfoKey $ \(BlockAnnounceEvent p bi no) -> do
                  pa <- toPeerAddr p
-                 checkBlockAnnounce conf denv no pa (view biHash bi)
+                 checkBlockAnnounce conf penv no pa (view biHash bi)
 
               subscribe @e AnyKnownPeerEventKey $ \(KnownPeerEvent p pd) -> do
 
@@ -1169,7 +1163,7 @@ runPeer opts = respawnOnError opts $ do
 
 
               let lwwRefProtoA = lwwRefProto (LWWRefProtoAdapter { lwwFetchBlock = download })
-                   where download h = withPeerM env $ withDownload denv (addDownload Nothing h)
+                   where download h = liftIO $ withPeerM env $ addDownload @e Nothing h
 
               flip runContT pure do
 
@@ -1180,7 +1174,7 @@ runPeer opts = respawnOnError opts $ do
 
                 peerThread "byPassWorker" (byPassWorker byPass)
 
-                peerThread "httpWorker" (httpWorker conf peerMeta denv)
+                peerThread "httpWorker" (httpWorker conf peerMeta)
 
                 metricsProbe <- newSimpleProbe "ghc.runtime"
                 addProbe metricsProbe
@@ -1203,9 +1197,7 @@ runPeer opts = respawnOnError opts $ do
                 peerThread "pexLoop" (pexLoop @e brains tcp)
 
                 -- FIXME: new-download-loop
-                peerThread "blockDownloadLoop" (blockDownloadLoop denv)
-
-                peerThread "blockDownloadQ" (downloadQueue conf (SomeBrains brains) denv)
+                peerThread "downloadDispatcher" (downloadDispatcher env)
 
                 peerThread "fillPeerMeta" (fillPeerMeta tcp tcpProbeWait)
 
@@ -1227,7 +1219,7 @@ runPeer opts = respawnOnError opts $ do
 
                 liftIO $ withPeerM penv do
                   runProto @e
-                    [ makeResponse (blockSizeProto blk (downloadOnBlockSize denv) onNoBlock)
+                    [ makeResponse (blockSizeProto blk onNoBlock)
                     , makeResponse (blockChunksProto adapter)
                     , makeResponse blockAnnounceProto
                     , makeResponse (withCredentials @e pc . peerHandShakeProto hshakeAdapter penv)
@@ -1300,7 +1292,7 @@ runPeer opts = respawnOnError opts $ do
                    subscribe @e BlockAnnounceInfoKey $ \(BlockAnnounceEvent p bi no) -> do
                     unless (p == self) do
                       pa <- toPeerAddr p
-                      checkBlockAnnounce conf denv no pa (view biHash bi)
+                      checkBlockAnnounce conf penv no pa (view biHash bi)
 
                    subscribe @e PeerAnnounceEventKey $ \pe@(PeerAnnounceEvent{}) -> do
                       -- debug $ "Got peer announce!" <+> pretty pip
@@ -1345,7 +1337,7 @@ runPeer opts = respawnOnError opts $ do
                            , rpcBrains = SomeBrains brains
                            , rpcByPassInfo = liftIO (getStat byPass)
                            , rpcProbes = probes
-                           , rpcDoFetch = liftIO . fetchHash penv denv
+                           , rpcDoFetch = liftIO . fetchHash penv
                            , rpcDoRefChanHeadPost = refChanHeadPostAction
                            , rpcDoRefChanPropose = refChanProposeAction
                            , rpcDoRefChanNotify = refChanNotifyAction
diff --git a/hbs2-peer/app/PeerTypes.hs b/hbs2-peer/app/PeerTypes.hs
index 56b22992..22e429fd 100644
--- a/hbs2-peer/app/PeerTypes.hs
+++ b/hbs2-peer/app/PeerTypes.hs
@@ -39,6 +39,7 @@ import PeerConfig
 import PeerLogger
 
 import Prelude hiding (log)
+import Control.Monad.Trans.Maybe
 import Control.Monad.Reader
 import Control.Monad.Writer qualified as W
 import Data.ByteString.Lazy (ByteString)
@@ -49,6 +50,7 @@ import Data.Maybe
 import Lens.Micro.Platform
 import Data.Hashable
 import Type.Reflection
+import Data.IntMap qualified as IntMap
 import Data.IntMap (IntMap)
 import Data.IntSet (IntSet)
 import Data.Text qualified as Text
@@ -122,11 +124,11 @@ instance Expires (SessionKey L4Proto (PeerInfo L4Proto)) where
   expiresIn = const (Just defCookieTimeoutSec)
 
 
-
 type MyPeer e = ( Eq (Peer e)
                 , Hashable (Peer e)
                 , Pretty (Peer e)
                 , HasPeer e
+                , Typeable e
                 , ForSignedBox (Encryption e)
                 )
 
@@ -243,121 +245,19 @@ downloadMonAdd :: forall m . MonadIO m
 downloadMonAdd env h whenDone = do
   atomically $ modifyTVar (view downloads env) (HashMap.insert h whenDone)
 
-data DownloadEnv e =
-  DownloadEnv
-  { _blockInQ       :: TVar (HashMap (Hash HbSync) BlockState)
-  , _blockInDirty   :: TVar Bool
-  , _blockCheckQ    :: TQueue (Hash HbSync)
-  , _blockSizeRecvQ :: TQueue (Peer e, Hash HbSync, Maybe Integer)
-     -- FIXME: trim!!
-  -- , _blockProposed  :: Cache (Hash HbSync, Peer e) ()
-  , _downloadMon    :: DownloadMonEnv
-  , _downloadBrains :: SomeBrains e
-  , _downloadProbe  :: TVar AnyProbe
-  }
 
-makeLenses 'DownloadEnv
-
-
-downloadEnvSetProbe :: forall e m . (MonadIO m, MyPeer e)
-                    => DownloadEnv e
-                    -> AnyProbe
-                    -> m ()
-downloadEnvSetProbe DownloadEnv{..} p = do
-  atomically $ writeTVar _downloadProbe p
-
-newDownloadEnv :: (MonadIO m, MyPeer e, HasBrains e brains) => brains -> m (DownloadEnv e)
-newDownloadEnv brains = liftIO do
-  DownloadEnv <$> newTVarIO mempty
-              <*> newTVarIO False
-              <*> newTQueueIO
-              <*> newTQueueIO
-              -- <*> Cache.newCache (Just (toTimeSpec (2 :: Timeout 'Seconds)))
-              <*> downloadMonNew
-              <*> pure (SomeBrains brains)
-              <*> newTVarIO (AnyProbe ())
-
-newtype BlockDownloadM e m a =
-  BlockDownloadM { fromBlockDownloadM :: ReaderT (DownloadEnv e) m a }
-  deriving newtype ( Functor
-                   , Applicative
-                   , Monad
-                   , MonadIO
-                   , MonadUnliftIO
-                   , MonadReader (DownloadEnv e)
-                   , MonadTrans
-                   )
-
-withDownload :: (MyPeer e, HasPeerLocator e m, MonadIO m) => DownloadEnv e -> BlockDownloadM e m a -> m a
-withDownload e m = runReaderT ( fromBlockDownloadM m ) e
-
-
-isBlockHereCached :: forall e m . ( MyPeer e
-                                  , MonadIO m
-                                  , HasStorage m
-                                  )
-            => Hash HbSync -> BlockDownloadM e m Bool
-
-isBlockHereCached h = do
-  sto <- lift getStorage
-  liftIO $ hasBlock sto h <&> isJust
-
-
-type DownloadConstr e m = ( MyPeer e
-                          , MonadIO m
-                          , HasPeerLocator e (BlockDownloadM e m)
-                          , HasStorage m -- (BlockDownloadM e m)
+type DownloadConstr e m = ( MonadIO m
+                          , EventEmitter e (DownloadReq e) m
                           )
 
 addDownload :: forall e m . ( DownloadConstr e m
                             )
             => Maybe (Hash HbSync)
             -> Hash HbSync
-            -> BlockDownloadM e m ()
+            -> m ()
 
 addDownload mbh h = do
-
-  tinq <- asks (view blockInQ)
-  checkQ <- asks (view blockCheckQ)
-  dirty <- asks (view blockInDirty)
-  brains <- asks (view downloadBrains)
-  here <- isBlockHereCached h
-
-  if here then do
-    deleteBlockFromQ h
-  else do
-    newBlock <- BlockState
-                  <$> liftIO getTimeCoarse
-                  <*> pure Nothing
-                  <*> liftIO (newTVarIO BlkNew)
-
-    claimBlockCameFrom @e brains mbh h
-    -- Cache.insert
-    liftIO $ atomically $ do
-      modifyTVar tinq $ HashMap.insert h newBlock
-      writeTQueue checkQ h
-      writeTVar dirty True
-
-
-deleteBlockFromQ :: MonadIO m => Hash HbSync -> BlockDownloadM e m ()
-deleteBlockFromQ h = do
-  inq <- asks (view blockInQ)
-  liftIO $ atomically $ modifyTVar' inq (HashMap.delete h)
-
-failedDownload :: forall e m . ( MyPeer e
-                               , MonadIO m
-                               , HasPeer e
-                               , HasPeerLocator e (BlockDownloadM e m)
-                               , HasStorage m
-                               )
-               => Peer e
-               -> Hash HbSync
-               -> BlockDownloadM e m ()
-
-failedDownload p h = do
-  trace $ "failedDownload" <+> pretty p <+> pretty h
-  addDownload mzero h
-  -- FIXME: brains-download-fail
+  emit @e DownloadReqKey (DownloadReqData h)
 
 type ForGossip e p m =
   ( MonadIO m
@@ -527,3 +427,46 @@ authorized f req = do
   when auth (f req)
 
 
+-- NOTE: this is an adapter for a ResponseM monad
+--       because response is working in ResponseM monad (ha!)
+--       So don't be confused with types
+--
+mkAdapter :: forall e m . ( m ~  PeerM e IO
+                          , HasProtocol e (BlockChunks e)
+                          , Hashable (SessionKey e (BlockChunks e))
+                          , Sessions e (BlockChunks e) (ResponseM e m)
+                          , Typeable (SessionKey e (BlockChunks e))
+                          , EventEmitter e (BlockChunks e) m
+                          , Pretty (Peer e)
+                          )
+          => m (BlockChunksI e (ResponseM e m ))
+mkAdapter = do
+  storage <- getStorage
+  pure $
+    BlockChunksI
+    { blkSize     = liftIO . hasBlock storage
+    , blkChunk    = \h o s -> liftIO (getChunk storage h o s)
+    , blkGetHash  = \c -> find (DownloadSessionKey @e c) (view sBlockHash)
+
+    , blkAcceptChunk = \(c,p,h,n,bs) -> void $ runMaybeT $ do
+        let cKey = DownloadSessionKey (p,c)
+
+        dodo <- lift $ find cKey (view sBlockChunks)
+
+        unless (isJust dodo) $ do
+          debug $ "session lost for peer !" <+> pretty p
+
+--        debug $ "FINDING-SESSION:" <+> pretty c <+> pretty n
+--        debug $ "GOT SHIT" <+> pretty c <+> pretty n
+
+        se <- MaybeT $ find cKey id
+        let dwnld  = view sBlockChunks se
+        let dwnld2 = view sBlockChunks2 se
+
+        -- debug $ "WRITE SHIT" <+> pretty c <+> pretty n
+        liftIO $ atomically do
+          writeTQueue dwnld (n, bs)
+          modifyTVar' dwnld2 (IntMap.insert (fromIntegral n) bs)
+    }
+
+
diff --git a/hbs2-peer/app/RPC2.hs b/hbs2-peer/app/RPC2.hs
index 555b1419..aa55a823 100644
--- a/hbs2-peer/app/RPC2.hs
+++ b/hbs2-peer/app/RPC2.hs
@@ -1,7 +1,6 @@
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 {-# Language UndecidableInstances #-}
 {-# Language AllowAmbiguousTypes #-}
-{-# LANGUAGE ImplicitParams #-}
 module RPC2
   ( module RPC2.Peer
   , module RPC2.RefLog
@@ -51,6 +50,7 @@ import RPC2.Mailbox()
 
 import PeerTypes
 import PeerInfo
+import BlockDownloadNew
 
 import Control.Monad.Trans.Maybe
 import Control.Monad.Trans.Cont
@@ -77,462 +77,6 @@ import Lens.Micro.Platform
 import Streaming.Prelude qualified as S
 
 
-data DownloadError e =
-   DownloadStuckError HashRef (Peer e)
- | StorageError
- | UnknownPeerError   (Peer e)
- | InternalError Int
- | PeerMissBlockError HashRef (Peer e)
- | PeerBlockHashMismatch (Peer e)
- | PeerRequestTimeout (Peer e)
- | Incomplete HashRef
-  deriving stock (Generic,Typeable)
-
-instance Pretty (Peer e) => Show (DownloadError e) where
-  show (DownloadStuckError h p)  = show $ parens $ "DownloadStuck" <+> pretty h <+> pretty p
-  show (UnknownPeerError p)  = show $ parens $ "UnknownPeerError" <+> pretty p
-  show (PeerMissBlockError h p)  = show $ parens $ "PeerMissBlockError" <+> pretty h <+> pretty p
-  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
-  show (Incomplete h) = show $ parens "Incomplete" <+> pretty h
-
-instance (Typeable e, Pretty (Peer e)) => Exception (DownloadError e)
-
-
-class BlockSizeCache e cache where
-
-  cacheBlockSize :: forall m . MonadUnliftIO m
-                 => cache
-                 -> PubKey 'Sign (Encryption e)
-                 -> Hash HbSync
-                 -> Integer
-                 -> m ()
-
-  findBlockSize :: forall m . MonadUnliftIO m
-                => cache
-                -> PubKey 'Sign (Encryption e)
-                -> Hash HbSync
-                -> m (Maybe Integer)
-
-instance BlockSizeCache e () where
-  cacheBlockSize _ _ _ _ = pure ()
-  findBlockSize _ _ _ = pure Nothing
-
-instance BlockSizeCache e (SomeBrains e) where
-  cacheBlockSize = brainsCacheBlockSize @e
-  findBlockSize = brainsFindBlockSize @e
-
-queryBlockSizeFromPeer :: forall e cache m . ( e ~ L4Proto
-                                             , MonadUnliftIO m
-                                             , BlockSizeCache e cache
-                                             )
-                 => cache
-                 -> PeerEnv e
-                 -> Hash HbSync
-                 -> Peer e
-                 -> m (Either (DownloadError e) (Maybe Integer))
-
-queryBlockSizeFromPeer cache e h peer = do
-
-  what <- try @_ @(DownloadError e) $ liftIO $ withPeerM e do
-
-    flip runContT pure $ callCC \exit -> do
-
-      PeerData{..} <- lift $ find (KnownPeerKey peer) id
-                       >>= orThrow (UnknownPeerError peer)
-
-      s <- lift $ findBlockSize @e cache _peerSignKey h
-
-      debug $ "FOUND CACHED VALUE" <+> pretty h <+> pretty s
-
-      maybe none (exit . Just) s
-
-      lift do
-
-        sizeQ <- newTQueueIO
-
-        subscribe @e (BlockSizeEventKey peer) $ \case
-          BlockSizeEvent (that, hx, sz) | hx == h -> do
-            atomically $ writeTQueue sizeQ (Just sz)
-            cacheBlockSize @e cache _peerSignKey h sz
-
-          _ -> do
-            atomically $ writeTQueue sizeQ Nothing
-
-        request peer (GetBlockSize @e h)
-
-        race ( pause defBlockInfoTimeout ) (atomically $ readTQueue sizeQ )
-           >>= orThrow (PeerRequestTimeout peer)
-
-  case what of
-    Left{}  -> pure $ Left (PeerRequestTimeout peer)
-    Right x -> pure (Right x)
-
-
-data BurstMachine =
-  BurstMachine
-  { _buTimeout  :: Double
-  , _buBurstMax :: Int
-  , _buStepUp   :: Double
-  , _buStepDown :: Double
-  , _buCurrent  :: TVar Double
-  , _buErrors   :: TVar Int
-  }
-
-burstMachineAddErrors :: MonadUnliftIO m => BurstMachine -> Int -> m ()
-burstMachineAddErrors BurstMachine{..} n =
-  atomically $ modifyTVar _buErrors (+n)
-
-newBurstMachine :: MonadUnliftIO m
-                => Double      -- ^ timeout
-                -> Int         -- ^ max burst
-                -> Maybe Int   -- ^ start burst
-                -> Double      -- ^ step up
-                -> Double      -- ^ step down
-                -> m BurstMachine
-
-newBurstMachine t0 buMax buStart up' down' = do
-  BurstMachine t0 buMax up down
-    <$> newTVarIO bu0
-    <*> newTVarIO 0
-
-  where
-    bu0 = realToFrac $ fromMaybe (max 2 (buMax `div` 2)) buStart
-    down = min 0.85 down'
-    up   = min 0.5 up'
-
-getCurrentBurst :: MonadUnliftIO m => BurstMachine -> m Int
-getCurrentBurst BurstMachine{..} = readTVarIO _buCurrent <&> round
-
-runBurstMachine :: MonadUnliftIO m
-                => BurstMachine
-                -> m ()
-
-runBurstMachine BurstMachine{..} = do
-
-
-  bu0  <- readTVarIO _buCurrent <&> realToFrac
-  let buMax = realToFrac _buBurstMax
-  let down  = _buStepDown
-  let up    = _buStepUp
-
-  _dEdT <- newTVarIO 0.00
-
-  _rates <- newTVarIO (mempty :: Map Double Double)
-
-  _buMaxReal <- newTVarIO buMax
-
-  pause @'Seconds (realToFrac _buTimeout)
-
-  flip runContT pure do
-
-    void $ ContT $ withAsync do
-      forever do
-        pause @'Seconds (realToFrac _buTimeout * 10)
-
-        atomically do
-          e <- headDef bu0 . Map.elems <$> readTVar _rates
-          nrates <- readTVar _rates <&> take 100 . Map.toList
-          writeTVar _rates (Map.fromList nrates)
-          modifyTVar _buMaxReal (max e)
-
-    void $ ContT $ withAsync do
-      forever do
-        pause @'Seconds 600
-        atomically $ writeTVar _buMaxReal buMax
-
-
-    void $ ContT $ withAsync do
-      forever do
-        pause @'Seconds (realToFrac _buTimeout * 2.0)
-        ddt <- readTVarIO _dEdT
-
-        when (ddt <= 0) do
-          atomically do
-            buMaxReal <- readTVar _buMaxReal
-            current <- readTVar _buCurrent
-            let new =  min buMaxReal (current * (1.0 + up))
-            writeTVar _buCurrent new
-
-    flip fix 0 $ \next e1 -> do
-
-      let dt = realToFrac _buTimeout
-
-      eNew <- atomically do
-
-        e2      <- readTVar _buErrors
-        current <- readTVar _buCurrent
-
-        new <- if e2 > e1 then do
-                    let d = max 2.0 (current * (1.0 - down))
-                    nrates <- readTVar _rates <&> drop 3 . Map.toList
-                    let newFucked = maybe d snd (headMay nrates)
-                    writeTVar _rates (Map.fromList nrates)
-                    pure newFucked
-
-                  else
-                    pure current -- $ min buMaxReal (current * (1.0 + up))
-
-        writeTVar _buErrors 0
-        writeTVar _buCurrent new
-
-        let dedt = realToFrac (e2 - e1) / realToFrac dt
-
-        writeTVar _dEdT (realToFrac dedt)
-
-        modifyTVar _rates ( Map.insertWith max dedt current )
-
-        pure e2
-
-      pause @'Seconds dt
-      next eNew
-
-data S =
-    SInit
-  | SFetchQ
-  | SFetchPost (Hash HbSync) ByteString
-  | SCheckBefore
-  | SCheckAfter
-
--- | downloads block with dependencies recursively
-downloadFromPeerRec :: 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) ())
-
-downloadFromPeerRec t bu0 cache env h0 peer = do
-
-  sto <- withPeerM env getStorage
-
-  p <- newTQueueIO
-  q <- newTQueueIO
-  qq <- newTQueueIO
-  toq <- newTVarIO ( mempty :: [Int] )
-
-  bm <- newBurstMachine 0.5 256 (Just bu0) 0.05 0.10
-
-  flip runContT pure do
-
-    ContT $ withAsync $ forever do
-      join $ atomically (readTQueue p)
-
-    ContT $ withAsync $ forever do
-      h <- atomically (readTQueue qq)
-      void $ queryBlockSizeFromPeer cache env h peer
-      pause @'Seconds 1.5
-
-    ContT $ withAsync $ flip fix 10000000 $ \next m0 -> do
-      txs <- readTVarIO toq <&> L.take 1000
-      let m1 = fromMaybe m0 $ median txs
-      when ( m1 > m0 ) $ burstMachineAddErrors bm 1
-      pause @'Seconds 3
-      next m1
-
-    ContT $ withAsync $ runBurstMachine bm
-
-    flip fix SInit $ \next -> \case
-
-      SInit -> do
-        debug "SInit"
-        atomically $ writeTQueue q h0
-        next SCheckBefore
-
-      SCheckBefore -> do
-        here <- hasBlock sto h0 <&> isJust
-        if here then next SCheckAfter else next SFetchQ
-
-      SFetchQ -> do
-        debug "SFetchQ"
-
-        done <- atomically do
-          pe <- isEmptyTQueue p
-          qe <- isEmptyTQueue q
-          when (qe && not pe) retry
-          -- when (not pe) retry
-          pure qe
-
-        if done then
-          next SCheckAfter
-        else do
-
-          h <- atomically $ readTQueue q
-          mbs <- getBlock sto h
-
-          case mbs of
-            Just bs -> next (SFetchPost h bs)
-            Nothing -> none
-
-          bu <- lift $ getCurrentBurst bm
-
-          t0 <- getTimeCoarse
-          w  <- lift $ downloadFromPeer t bu cache env (coerce h) peer
-          t1 <- getTimeCoarse
-          let dt = toMicroSeconds $ TimeoutTS (t1 - t0)
-          atomically $ modifyTVar toq ( dt : )
-
-          case w of
-            Right bs -> do
-              next (SFetchPost h bs)
-
-            Left e -> do
-             lift $ burstMachineAddErrors bm 1
-             err $ "DOWNLOAD ERROR" <+> viaShow e
-             next SFetchQ
-
-      SFetchPost h bs -> do
-        debug $ "SFetchPost" <+> pretty h
-
-        let parse = do
-             let refs = extractBlockRefs h bs
-             atomically $ mapM_ (writeTQueue q . coerce) refs
-             mapM_ (atomically . writeTQueue qq . coerce) refs
-
-        atomically $ writeTQueue p parse
-
-        next SFetchQ
-
-      SCheckAfter -> do
-        debug "SCheckAfter"
-        missed <- findMissedBlocks sto (HashRef h0)
-        mapM_ (atomically . writeTQueue q . coerce) missed
-        mapM_ (atomically . writeTQueue qq . coerce) missed
-        unless (L.null missed) $ next SFetchQ
-
-    pure $ 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 bu cache env h peer = liftIO $ withPeerM env do
-
-  pd@PeerData{..} <- find (KnownPeerKey peer) id
-                   >>= orThrow (UnknownPeerError peer)
-
-  pinfo <- find (PeerInfoKey peer) id
-             >>= orThrow (UnknownPeerError peer)
-
-  rtt <- liftIO $ medianPeerRTT pinfo
-             <&> fmap ((*1) . realToFrac)
-             <&> fromMaybe 1000
-             <&> (/1e6)
-
-  let waity = 10 * rtt
-
-  sto <- getStorage
-
-  let chunkSize = defChunkSize
-
-  flip runContT pure $ callCC \exit -> do
-
-    size <- lift (findBlockSize @e cache _peerSignKey h)
-             >>= maybe (queryBlockSize exit) pure
-
-    coo <- genCookie (peer,h)
-    let key = DownloadSessionKey (peer, coo)
-    down@BlockDownload{..} <- newBlockDownload h
-    let chuQ = _sBlockChunks
-    let new =   set sBlockChunkSize chunkSize
-              . set sBlockSize (fromIntegral size)
-                $ down
-
-    lift $ update @e new key id
-
-    let offsets = calcChunks size (fromIntegral chunkSize)  :: [(Offset, Size)]
-
-    let chunkNums = [ 0 .. pred (length offsets) ]
-
-    let bursts = calcBursts bu chunkNums
-
-    callCC $ \exit2 -> do
-
-      _wx <- newTVarIO waity
-
-      for_ bursts $ \(i,chunkN) -> do
-
-        -- atomically $ flushTQueue chuQ
-
-        let req = BlockChunks @e coo (BlockGetChunks h chunkSize (fromIntegral i) (fromIntegral chunkN))
-
-        lift $ request peer req
-
-        t0 <- getTimeCoarse
-
-        let watchdog = fix \next -> do
-             wx <- readTVarIO _wx <&> realToFrac
-             -- debug $ "WATCHDOG" <+> pretty wx <+> pretty waity
-             r <- race (pause @'MilliSeconds (min wx waity)) do
-                    void $ atomically $ readTQueue chuQ
-             either (const none) (const next) r
-
-        r <- liftIO $ race watchdog do
-
-          atomically do
-            pieces <- readTVar _sBlockChunks2
-            let done  = and [ IntMap.member j pieces | j <- [i .. i + chunkN-1] ]
-            unless done retry
-
-        atomically $ flushTQueue chuQ
-
-        t1 <- getTimeCoarse
-
-        atomically do
-          wx0 <- readTVar _wx
-          let wx1 = realToFrac (t1 - t0) * 100 / 1e6 -- millis
-          writeTVar _wx wx1
-
-        case r of
-          Left{} -> exit2 (Left $ DownloadStuckError (HashRef h) peer)
-          _ -> pure ()
-
-
-      blk <- readTVarIO _sBlockChunks2
-      let rs = LBS.concat $ IntMap.elems blk
-
-      ha <- putBlock sto rs
-
-      -- let ha = Just $ hashObject @HbSync rs
-
-      lift $ expire @e key
-
-      case ha of
-        Nothing -> pure $ Left StorageError
-
-        Just h1 | h1 == h -> do
-          pure $ Right rs
-
-        Just h1 -> do
-          delBlock sto h1
-          pure $ Left (PeerBlockHashMismatch peer)
-
-  where
-
-    queryBlockSize exit = do
-      what <- lift $ queryBlockSizeFromPeer cache env h peer
-      case what of
-        Left{}  -> exit (Left (PeerRequestTimeout peer))
-        Right Nothing -> exit (Left (PeerMissBlockError (HashRef h) peer))
-        Right (Just s) -> pure s
-
 instance (e ~ L4Proto, MonadUnliftIO m, HasRpcContext PeerAPI RPC2Context m) => HandleMethod m RpcRunScript where
   handleMethod top = do
 
diff --git a/hbs2-peer/app/RefChan.hs b/hbs2-peer/app/RefChan.hs
index bca84594..162e5524 100644
--- a/hbs2-peer/app/RefChan.hs
+++ b/hbs2-peer/app/RefChan.hs
@@ -38,7 +38,6 @@ import HBS2.Storage
 
 import PeerTypes hiding (downloads)
 import PeerConfig
-import BlockDownload()
 import Brains
 
 import Control.Monad.Trans.Cont
@@ -91,7 +90,6 @@ data RefChanWorkerEnv e =
   RefChanWorkerEnv
   { _refChanWorkerConf            :: PeerConfig
   , _refChanPeerEnv               :: PeerEnv e
-  , _refChanWorkerEnvDEnv         :: DownloadEnv e
   , _refChanNotifySource          :: SomeNotifySource (RefChanEvents e)
   , _refChanWorkerEnvHeadQ        :: TQueue (RefChanId e, RefChanHeadBlockTran e)
   , _refChanWorkerEnvDownload     :: TVar (HashMap HashRef (RefChanId e, (TimeSpec, OnDownloadComplete)))
@@ -121,12 +119,11 @@ refChanWorkerEnvSetProbe RefChanWorkerEnv{..} probe = do
 refChanWorkerEnv :: forall m e . (MonadIO m, ForRefChans e)
                  => PeerConfig
                  -> PeerEnv e
-                 -> DownloadEnv e
                  -> SomeNotifySource (RefChanEvents e)
                  -> m (RefChanWorkerEnv e)
 
-refChanWorkerEnv conf pe de nsource =
-  liftIO $ RefChanWorkerEnv @e conf pe de nsource
+refChanWorkerEnv conf pe nsource =
+  liftIO $ RefChanWorkerEnv @e conf pe nsource
     <$> newTQueueIO
     <*> newTVarIO mempty
     <*> newTVarIO mempty
@@ -217,8 +214,7 @@ refChanAddDownload :: forall e m . ( m ~ PeerM e IO
 refChanAddDownload env chan r onComlete = do
   penv <- ask
   t <- getTimeCoarse
-  withPeerM penv $ withDownload (_refChanWorkerEnvDEnv env)
-                 $ addDownload @e Nothing (fromHashRef r)
+  liftIO $ withPeerM penv $ addDownload @e Nothing (fromHashRef r)
 
   atomically $ modifyTVar (view refChanWorkerEnvDownload env) (HashMap.insert r (chan,(t, onComlete)))
 
@@ -903,7 +899,11 @@ logMergeProcess penv env q = withPeerM penv do
           atomically $ modifyTVar (mergeHeads e) (HashMap.insert h headblk)
           pure headblk
 
-    downloadMissedHead :: AnyStorage -> RefChanId e -> HashRef -> m ()
+    downloadMissedHead :: EventEmitter e (DownloadReq e) m
+                       => AnyStorage
+                       -> RefChanId e
+                       -> HashRef
+                       -> m ()
     downloadMissedHead sto chan headRef = do
       penv <- ask
       here <- liftIO $ hasBlock sto (fromHashRef headRef) <&> isJust
diff --git a/hbs2-peer/hbs2-peer.cabal b/hbs2-peer/hbs2-peer.cabal
index b4352ab9..ac909b7e 100644
--- a/hbs2-peer/hbs2-peer.cabal
+++ b/hbs2-peer/hbs2-peer.cabal
@@ -245,10 +245,9 @@ executable hbs2-peer
     main-is:          PeerMain.hs
 
     other-modules:
-                      BlockDownload
+                      BlockDownloadNew
                     , BrainyPeerLocator
                     , ByPassWorker
-                    , DownloadQ
                     , DownloadMon
                     , Bootstrap
                     , PeerInfo
diff --git a/hbs2-peer/lib/HBS2/Peer/Proto/BlockInfo.hs b/hbs2-peer/lib/HBS2/Peer/Proto/BlockInfo.hs
index cbb35be0..718d0f72 100644
--- a/hbs2-peer/lib/HBS2/Peer/Proto/BlockInfo.hs
+++ b/hbs2-peer/lib/HBS2/Peer/Proto/BlockInfo.hs
@@ -10,6 +10,7 @@ import HBS2.Hash
 
 import HBS2.System.Logger.Simple
 
+import Type.Reflection (someTypeRep)
 import Data.Hashable
 import Data.Maybe
 import Data.ByteString (ByteString)
@@ -33,13 +34,12 @@ blockSizeProto :: forall e m proto . ( MonadIO m
                                      , proto ~ BlockInfo e
                                      )
                => GetBlockSize  HbSync m
-               -> HasBlockEvent HbSync e m
                -> ( (Peer e, Hash HbSync) -> m () )
                -> BlockInfo e
                -> m ()
 
 -- FIXME: with-auth-combinator
-blockSizeProto getBlockSize evHasBlock onNoBlock =
+blockSizeProto getBlockSize onNoBlock =
   \case
     GetBlockSize h -> do
       -- liftIO $ print "GetBlockSize"
@@ -57,13 +57,13 @@ blockSizeProto getBlockSize evHasBlock onNoBlock =
       that <- thatPeer @proto
       emit @e (BlockSizeEventKey that) (NoBlockEvent (that, h))
       emit @e AnyBlockSizeEventKey (AnyBlockSizeEvent h Nothing that)
-      evHasBlock ( that, h, Nothing )
+      -- evHasBlock ( that, h, Nothing )
 
     BlockSize h sz  -> deferred @proto do
       that <- thatPeer @proto
       emit @e (BlockSizeEventKey @e that) (BlockSizeEvent (that, h, sz))
       emit @e AnyBlockSizeEventKey (AnyBlockSizeEvent h (Just sz) that)
-      evHasBlock ( that, h, Just sz )
+      -- evHasBlock ( that, h, Just sz )
 
 data AnyBlockSizeEvent e
 
@@ -71,8 +71,15 @@ data instance EventKey e (AnyBlockSizeEvent e) =
   AnyBlockSizeEventKey
   deriving stock (Typeable, Generic, Eq)
 
-instance Hashable (EventKey e (AnyBlockSizeEvent e)) where
-  hashWithSalt s _ = hashWithSalt s ("AnyBlockSizeEventKey_1730696922" :: ByteString)
+instance Typeable e => Hashable (EventKey e (AnyBlockSizeEvent e)) where
+  hashWithSalt s _ =
+    hashWithSalt s (someTypeRep (Proxy :: Proxy (EventKey e (AnyBlockSizeEvent e))) :: TypeRep)
+
+instance EventType (Event e (AnyBlockSizeEvent e)) where
+  isPersistent = True
+
+instance Expires (EventKey e (AnyBlockSizeEvent e)) where
+  expiresIn = const Nothing -- (Just defCookieTimeoutSec)
 
 data instance Event e (AnyBlockSizeEvent e) =
   AnyBlockSizeEvent