diff --git a/hbs2-core/lib/HBS2/Net/Proto/Types.hs b/hbs2-core/lib/HBS2/Net/Proto/Types.hs
index aa4d622f..c691f356 100644
--- a/hbs2-core/lib/HBS2/Net/Proto/Types.hs
+++ b/hbs2-core/lib/HBS2/Net/Proto/Types.hs
@@ -104,7 +104,7 @@ class ( MonadIO m
 
   response :: p -> m ()
 
-class Request e p (m :: Type -> Type) | p -> e where
+class HasProtocol e p => Request e p (m :: Type -> Type) | p -> e where
   request :: Peer e -> p -> m ()
 
 data ReqLimPeriod = NoLimit
diff --git a/hbs2-peer/app/RefChan.hs b/hbs2-peer/app/RefChan.hs
index 17504cdb..8b13c976 100644
--- a/hbs2-peer/app/RefChan.hs
+++ b/hbs2-peer/app/RefChan.hs
@@ -49,13 +49,13 @@ import Data.HashSet qualified as HashSet
 import Data.List qualified as List
 import Data.Maybe
 import Lens.Micro.Platform
-import Data.Heap qualified as Heap
-import Data.Heap (Heap,Entry(..))
+-- import Data.Heap qualified as Heap
+import Data.Heap ()
 import Codec.Serialise
 import UnliftIO
 
 import Streaming.Prelude qualified as S
-import Streaming qualified as S
+import Streaming()
 
 {- HLINT ignore "Use newtype instead of data" -}
 
@@ -63,11 +63,13 @@ data DataNotReady = DataNotReady deriving (Show)
 
 instance Exception DataNotReady
 
+type OnDownloadComplete = HashRef -> IO ()
+
 data RefChanWorkerEnv e =
   RefChanWorkerEnv
   { _refChanWorkerEnvDEnv     :: DownloadEnv e
   , _refChanWorkerEnvHeadQ    :: TQueue (RefChanId e, RefChanHeadBlockTran e)
-  , _refChanWorkerEnvDownload :: TVar (HashMap HashRef (RefChanId e, TimeSpec))
+  , _refChanWorkerEnvDownload :: TVar (HashMap HashRef (RefChanId e, (TimeSpec, OnDownloadComplete)))
   , _refChanWorkerEnvNotify   :: TVar (HashMap (RefChanId e) ())
   , _refChanWorkerEnvWriteQ   :: TQueue HashRef
   }
@@ -102,14 +104,18 @@ refChanNotifyOnUpdated env chan = do
 refChanAddDownload :: forall e m . ( m ~ PeerM e IO
                                    , MyPeer e
                                    )
-                   => RefChanWorkerEnv e -> RefChanId e -> HashRef -> m ()
-refChanAddDownload env chan r = do
+                   => RefChanWorkerEnv e
+                   -> RefChanId e
+                   -> HashRef
+                   -> OnDownloadComplete
+                   -> m ()
+refChanAddDownload env chan r onComlete = do
   penv <- ask
   t <- getTimeCoarse
   withPeerM penv $ withDownload (_refChanWorkerEnvDEnv env)
                  $ processBlock @e (fromHashRef r)
 
-  atomically $ modifyTVar (view refChanWorkerEnvDownload env) (HashMap.insert r (chan,t))
+  atomically $ modifyTVar (view refChanWorkerEnvDownload env) (HashMap.insert r (chan,(t, onComlete)))
 
 -- FIXME: slow-deep-scan-exception-seems-not-working
 checkDownloaded :: forall m . (MonadIO m, HasStorage m) => HashRef -> m Bool
@@ -131,7 +137,7 @@ refChanWorker :: forall e s m . ( MonadIO m
                                 , MyPeer e
                                 , HasStorage m
                                 , Request e (RefChanHead e) m
-                                , HasProtocol e (RefChanHead e)
+                                , Request e (RefChanRequest e) m
                                 , Sessions e (KnownPeer e) m
                                 , Signatures s
                                 , s ~ Encryption e
@@ -151,26 +157,35 @@ refChanWorker env brains = do
 
   penv <- ask
 
+  mergeQ <- newTQueueIO
 
   -- FIXME: resume-on-exception
   hw <- async (refChanHeadMon penv)
 
-  downloads <- async monitorDownloads
+  downloads <- async monitorHeadDownloads
 
-  polls <- async refChanHeadPoll
+  polls <- async refChanPoll
 
   wtrans <- async refChanWriter
 
   cleanup1 <- async cleanupRounds
 
+  merge <- async (logMergeProcess env mergeQ)
+
   subscribe @e RefChanRequestEventKey $ \(RefChanRequestEvent chan val) -> do
     debug $ "RefChanRequestEvent" <+> pretty (AsBase58 chan) <+> pretty val
 
+    refChanAddDownload env chan val $ \href -> do
+      debug $ "BLOCK DOWNLOADED" <+> pretty href
+      atomically $ writeTQueue mergeQ (chan, href)
+
+    atomically $ writeTQueue mergeQ (chan, val)
+
   forever do
    pause @'Seconds 10
    debug "I'm refchan worker"
 
-  mapM_ waitCatch [hw,downloads,polls,wtrans,cleanup1]
+  mapM_ waitCatch [hw,downloads,polls,wtrans,merge,cleanup1]
 
   where
 
@@ -242,26 +257,28 @@ refChanWorker env brains = do
 
           debug $ "REFCHANLOG UPDATED:" <+> pretty c <+> pretty nref
 
-    refChanHeadPoll = do
+    refChanPoll = do
 
       let listRefs = listPolledRefs @e brains "refchan" <&> fmap (over _2 ( (*60) . fromIntegral) )
 
       polling (Polling 5 5) listRefs $ \ref -> do
         debug $ "POLLING REFCHAN" <+> pretty (AsBase58 ref)
         broadCastMessage (RefChanGetHead @e ref)
+        broadCastMessage (RefChanRequest @e ref)
 
-    monitorDownloads = forever do
-      pause @'Seconds 2
+    monitorHeadDownloads = forever do
+      pause @'Seconds 1
       all <- atomically $ readTVar (view refChanWorkerEnvDownload env) <&> HashMap.toList
 
       now <- getTimeCoarse
 
       -- FIXME: change-to-polling-functions
       -- FIXME: consider-timeouts-or-leak-is-possible
-      rest <- forM all $ \(r,item@(chan,t)) -> do
+      rest <- forM all $ \(r,item@(chan,(t,onComplete))) -> do
                 here <- checkDownloaded r
                 if here then do
-                  refChanOnHeadFn env chan (RefChanHeadBlockTran r)
+                  liftIO $ onComplete r
+                  -- refChanOnHeadFn env chan (RefChanHeadBlockTran r)
                   pure mempty
                 else do
                   -- FIXME: fix-timeout-hardcode
@@ -279,7 +296,7 @@ refChanWorker env brains = do
         here <- checkDownloaded hr
 
         if not here then do
-          refChanAddDownload env chan hr
+          refChanAddDownload env chan hr (withPeerM pe . refChanOnHeadFn env chan . RefChanHeadBlockTran)
           trace $ "BLOCK IS NOT HERE" <+> pretty hr
         else do
           sto <- getStorage
@@ -343,10 +360,29 @@ refChanWorker env brains = do
 
         pure ()
 
-      -- если всё скачано --- то обрабатываем.
-      -- если не скачано -- то говорим качать и ждём. как ждём?
-      -- помещаем в фигню, которая download запускает, и время от времени ждёт,
-      -- пока скачается. как скачается -- убирает из своего локального стейта,
-      -- и пихает транзу обратно в эту очередь, допустим.
+logMergeProcess :: forall e s m . ( MonadUnliftIO m
+                                  , MyPeer e
+                                  , ForRefChans e
+                                  , s ~ Encryption e
+                                  )
+                => RefChanWorkerEnv e
+                -> TQueue (RefChanId e, HashRef)
+                -> m ()
+
+logMergeProcess _ q = do
+  forever do
+    -- FIXME: fix-hardcoded-timeout
+    pause @'Seconds 1
+    _ <- atomically $ peekTQueue q
+    logs <- liftIO $ atomically $ flushTQueue q
+    let byChan = HashMap.fromListWith (<>) [ (x,[y]) | (x,y) <- logs ] & HashMap.toList
+
+    -- FIXME: in-parallel
+    mapM_ logMergeChan byChan
 
 
+  where
+
+    logMergeChan (chan, logs) = do
+      debug $ "ABOUT TO MERGE LOGS" <+> pretty (AsBase58 chan) <+> pretty (length logs)
+