anchor.diff:                  {{_, _}, {_, DR}} ->
                       aec_sync:start_sync(PeerId, RTHash, DR)
               end,
  -            aec_peers:add_and_ping_peers(RPeers),
  -            aec_sync:fetch_mempool(PeerId),
  +            ok = aec_peers:add_and_ping_peers(RPeers),
  +            ok = aec_sync:fetch_mempool(PeerId),
               {ok, RPeers};
           _Err ->
               {error, <<"wrong genesis_hash">>}
  
positive.code:         <<"error">> ->
              gen_server:reply(From, {error, maps:get(<<"reason">>, MsgObj)})
      end,
      drop_request(S, get_n_successors).
  
  %% -- Get Block --------------------------------------------------------------
  
  
negative.code:         <<"error">> ->
              gen_server:reply(From, {error, maps:get(<<"reason">>, MsgObj)})
      end,
      remove_request_fld(S, get_header_by_height).
  
  %% -- Get N Successors -------------------------------------------------------
  
  