diff --git a/create-hardfork/create-hardfork.cpp b/create-hardfork/create-hardfork.cpp
index 849a31b1..27260ee0 100644
--- a/create-hardfork/create-hardfork.cpp
+++ b/create-hardfork/create-hardfork.cpp
@@ -236,7 +236,7 @@ class HardforkCreator : public td::actor::Actor {
         td::actor::send_closure(id_, &ton::validator::ValidatorManager::sync_complete,
                                 td::PromiseCreator::lambda([](td::Unit) {}));
       }
-      void subscribe_to_shard(ton::ShardIdFull) override {
+      void update_shard_configuration(td::Ref<ton::validator::MasterchainState> state) override {
       }
       void send_ihr_message(ton::AccountIdPrefixFull dst, td::BufferSlice data) override {
       }
diff --git a/overlay/overlay-manager.cpp b/overlay/overlay-manager.cpp
index 2eac5a0c..62d98eb0 100644
--- a/overlay/overlay-manager.cpp
+++ b/overlay/overlay-manager.cpp
@@ -92,14 +92,15 @@ void OverlayManager::delete_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdSho
 void OverlayManager::create_public_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
                                            std::unique_ptr<Callback> callback, OverlayPrivacyRules rules, td::string scope) {
   CHECK(!dht_node_.empty());
+  CHECK(callback != nullptr);
   auto id = overlay_id.compute_short_id();
   register_overlay(local_id, id,
                    Overlay::create(keyring_, adnl_, actor_id(this), dht_node_, local_id, std::move(overlay_id),
                                    std::move(callback), std::move(rules), scope));
 }
 
-void OverlayManager::create_public_overlay_no_subscribe(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
-                                                        OverlayPrivacyRules rules, td::string scope) {
+void OverlayManager::create_public_overlay_external(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
+                                                    OverlayPrivacyRules rules, td::string scope) {
   CHECK(!dht_node_.empty());
   auto id = overlay_id.compute_short_id();
   register_overlay(local_id, id,
@@ -266,12 +267,16 @@ void OverlayManager::get_overlay_random_peers(adnl::AdnlNodeIdShort local_id, Ov
                                               td::uint32 max_peers,
                                               td::Promise<std::vector<adnl::AdnlNodeIdShort>> promise) {
   auto it = overlays_.find(local_id);
-  if (it != overlays_.end()) {
-    auto it2 = it->second.find(overlay_id);
-    if (it2 != it->second.end()) {
-      td::actor::send_closure(it2->second, &Overlay::get_overlay_random_peers, max_peers, std::move(promise));
-    }
+  if (it == overlays_.end()) {
+    promise.set_error(td::Status::Error(PSTRING() << "no such local id " << local_id));
+    return;
   }
+  auto it2 = it->second.find(overlay_id);
+  if (it2 == it->second.end()) {
+    promise.set_error(td::Status::Error(PSTRING() << "no such overlay " << overlay_id));
+    return;
+  }
+  td::actor::send_closure(it2->second, &Overlay::get_overlay_random_peers, max_peers, std::move(promise));
 }
 
 td::actor::ActorOwn<Overlays> Overlays::create(std::string db_root, td::actor::ActorId<keyring::Keyring> keyring,
diff --git a/overlay/overlay-manager.h b/overlay/overlay-manager.h
index b03261e8..a3ed4a54 100644
--- a/overlay/overlay-manager.h
+++ b/overlay/overlay-manager.h
@@ -52,8 +52,8 @@ class OverlayManager : public Overlays {
 
   void create_public_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
                              std::unique_ptr<Callback> callback, OverlayPrivacyRules rules, td::string scope) override;
-  void create_public_overlay_no_subscribe(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
-                                          OverlayPrivacyRules rules, td::string scope) override;
+  void create_public_overlay_external(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
+                                      OverlayPrivacyRules rules, td::string scope) override;
   void create_private_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
                               std::vector<adnl::AdnlNodeIdShort> nodes, std::unique_ptr<Callback> callback,
                               OverlayPrivacyRules rules) override;
diff --git a/overlay/overlay-peers.cpp b/overlay/overlay-peers.cpp
index 0539383f..dbb6f32a 100644
--- a/overlay/overlay-peers.cpp
+++ b/overlay/overlay-peers.cpp
@@ -142,7 +142,9 @@ void OverlayImpl::receive_random_peers(adnl::AdnlNodeIdShort src, td::BufferSlic
 void OverlayImpl::send_random_peers_cont(adnl::AdnlNodeIdShort src, OverlayNode node,
                                          td::Promise<td::BufferSlice> promise) {
   std::vector<tl_object_ptr<ton_api::overlay_node>> vec;
-  vec.emplace_back(node.tl());
+  if (!is_external()) {
+    vec.emplace_back(node.tl());
+  }
 
   for (td::uint32 i = 0; i < nodes_to_send(); i++) {
     auto P = get_random_peer();
diff --git a/overlay/overlay.cpp b/overlay/overlay.cpp
index a6d0bc89..8a655c6e 100644
--- a/overlay/overlay.cpp
+++ b/overlay/overlay.cpp
@@ -18,6 +18,7 @@
 */
 #include "auto/tl/ton_api.h"
 #include "td/utils/Random.h"
+#include "common/delay.h"
 
 #include "adnl/utils.hpp"
 #include "dht/dht.h"
@@ -73,7 +74,12 @@ OverlayImpl::OverlayImpl(td::actor::ActorId<keyring::Keyring> keyring, td::actor
     , scope_(scope) {
   overlay_id_ = id_full_.compute_short_id();
 
-  VLOG(OVERLAY_INFO) << this << ": creating " << (public_ ? "public" : "private");
+  if (is_external()) {
+    CHECK(public_);
+    VLOG(OVERLAY_INFO) << this << ": creating public external";
+  } else {
+    VLOG(OVERLAY_INFO) << this << ": creating " << (public_ ? "public" : "private");
+  }
 
   for (auto &node : nodes) {
     CHECK(!public_);
@@ -86,6 +92,7 @@ OverlayImpl::OverlayImpl(td::actor::ActorId<keyring::Keyring> keyring, td::actor
 
 void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::overlay_getRandomPeers &query,
                                 td::Promise<td::BufferSlice> promise) {
+  CHECK(!is_external());
   if (public_) {
     VLOG(OVERLAY_DEBUG) << this << ": received " << query.peers_->nodes_.size() << " nodes from " << src
                         << " in getRandomPeers query";
@@ -106,6 +113,7 @@ void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::overlay_getR
 
 void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::overlay_getBroadcast &query,
                                 td::Promise<td::BufferSlice> promise) {
+  CHECK(!is_external());
   auto it = broadcasts_.find(query.hash_);
   if (it == broadcasts_.end()) {
     VLOG(OVERLAY_NOTICE) << this << ": received getBroadcastQuery(" << query.hash_ << ") from " << src
@@ -127,16 +135,17 @@ void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::overlay_getB
 
 void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::overlay_getBroadcastList &query,
                                 td::Promise<td::BufferSlice> promise) {
+  CHECK(!is_external());
   VLOG(OVERLAY_WARNING) << this << ": DROPPING getBroadcastList query";
   promise.set_error(td::Status::Error(ErrorCode::protoviolation, "dropping get broadcast list query"));
 }
 
-/*void OverlayImpl::process_query(adnl::AdnlNodeIdShort src, adnl::AdnlQueryId query_id, ton_api::overlay_customQuery &query) {
-  callback_->receive_query(src, query_id, id_, std::move(query.data_));
-}
-*/
-
 void OverlayImpl::receive_query(adnl::AdnlNodeIdShort src, td::BufferSlice data, td::Promise<td::BufferSlice> promise) {
+  if (is_external()) {
+    LOG(OVERLAY_WARNING) << "dropping query in external overlay " << overlay_id_;
+    promise.set_error(td::Status::Error("overlay is external"));
+    return;
+  }
   if (!public_) {
     auto P = peers_.get(src);
     if (P == nullptr) {
@@ -149,9 +158,6 @@ void OverlayImpl::receive_query(adnl::AdnlNodeIdShort src, td::BufferSlice data,
 
   if (R.is_error()) {
     // allow custom query to be here
-    if (!subscribed()) {
-      return;
-    }
     callback_->receive_query(src, overlay_id_, std::move(data), std::move(promise));
     return;
   }
@@ -165,27 +171,32 @@ void OverlayImpl::receive_query(adnl::AdnlNodeIdShort src, td::BufferSlice data,
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_broadcast> bcast) {
+  CHECK(!is_external());
   return BroadcastSimple::create(this, message_from, std::move(bcast));
 }
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_broadcastFec> b) {
+  CHECK(!is_external());
   return OverlayFecBroadcastPart::create(this, message_from, std::move(b));
 }
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_broadcastFecShort> b) {
+  CHECK(!is_external());
   return OverlayFecBroadcastPart::create(this, message_from, std::move(b));
 }
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_broadcastNotFound> bcast) {
+  CHECK(!is_external());
   return td::Status::Error(ErrorCode::protoviolation,
                            PSTRING() << "received strange message broadcastNotFound from " << message_from);
 }
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_fec_received> msg) {
+  CHECK(!is_external());
   auto it = fec_broadcasts_.find(msg->hash_);
   if (it != fec_broadcasts_.end()) {
     VLOG(OVERLAY_DEBUG) << this << ": received fec opt-out message from " << message_from << " for broadcast "
@@ -200,6 +211,7 @@ td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_fec_completed> msg) {
+  CHECK(!is_external());
   auto it = fec_broadcasts_.find(msg->hash_);
   if (it != fec_broadcasts_.end()) {
     VLOG(OVERLAY_DEBUG) << this << ": received fec completed message from " << message_from << " for broadcast "
@@ -214,12 +226,17 @@ td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
 
 td::Status OverlayImpl::process_broadcast(adnl::AdnlNodeIdShort message_from,
                                           tl_object_ptr<ton_api::overlay_unicast> msg) {
+  CHECK(!is_external());
   VLOG(OVERLAY_DEBUG) << this << ": received unicast from " << message_from;
   callback_->receive_message(message_from, overlay_id_, std::move(msg->data_));
   return td::Status::OK();
 }
 
 void OverlayImpl::receive_message(adnl::AdnlNodeIdShort src, td::BufferSlice data) {
+  if (is_external()) {
+    LOG(OVERLAY_WARNING) << "dropping message in external overlay " << overlay_id_;
+    return;
+  }
   if (!public_) {
     if (peers_.get(src) == nullptr) {
       VLOG(OVERLAY_WARNING) << this << ": received query in private overlay from unknown source " << src;
@@ -228,9 +245,6 @@ void OverlayImpl::receive_message(adnl::AdnlNodeIdShort src, td::BufferSlice dat
   }
   auto X = fetch_tl_object<ton_api::overlay_Broadcast>(data.clone(), true);
   if (X.is_error()) {
-    if (!subscribed()) {
-      return;
-    }
     VLOG(OVERLAY_DEBUG) << this << ": received custom message";
     callback_->receive_message(src, overlay_id_, std::move(data));
     return;
@@ -274,7 +288,7 @@ void OverlayImpl::alarm() {
   }
   
   if (public_) {
-    if (peers_.size() > 0 && subscribed()) {
+    if (peers_.size() > 0) {
       auto P = get_random_peer();
       if (P) {
         send_random_peers(P->get_id(), {});
@@ -330,6 +344,10 @@ void OverlayImpl::receive_dht_nodes(td::Result<dht::DhtValue> res, bool dummy) {
     VLOG(OVERLAY_NOTICE) << this << ": can not get value from DHT: " << res.move_as_error();
   }
 
+  if (is_external()) {
+    return;
+  }
+
   VLOG(OVERLAY_INFO) << this << ": adding self node to DHT overlay's nodes";
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this), oid = print_id()](td::Result<OverlayNode> R) {
     if (R.is_error()) {
@@ -342,7 +360,7 @@ void OverlayImpl::receive_dht_nodes(td::Result<dht::DhtValue> res, bool dummy) {
 }
 
 void OverlayImpl::update_dht_nodes(OverlayNode node) {
-  if (!public_ || !subscribed()) {
+  if (!public_) {
     return;
   }
 
@@ -399,12 +417,30 @@ void OverlayImpl::bcast_gc() {
 }
 
 void OverlayImpl::send_message_to_neighbours(td::BufferSlice data) {
+  if (neighbours_.empty()) {
+    // TODO: limit retries
+    delay_action(
+        [SelfId = actor_id(this), data = std::move(data)]() mutable {
+          td::actor::send_closure(SelfId, &OverlayImpl::send_message_to_neighbours, std::move(data));
+        },
+        td::Timestamp::in(0.5));
+    return;
+  }
   for (auto &n : neighbours_) {
     td::actor::send_closure(manager_, &OverlayManager::send_message, n, local_id_, overlay_id_, data.clone());
   }
 }
 
 void OverlayImpl::send_broadcast(PublicKeyHash send_as, td::uint32 flags, td::BufferSlice data) {
+  if (neighbours_.empty()) {
+    // TODO: limit retries
+    delay_action(
+        [SelfId = actor_id(this), send_as, flags, data = std::move(data)]() mutable {
+          td::actor::send_closure(SelfId, &OverlayImpl::send_broadcast, send_as, flags, std::move(data));
+        },
+        td::Timestamp::in(0.5));
+    return;
+  }
   auto S = BroadcastSimple::create_new(actor_id(this), keyring_, send_as, std::move(data), flags);
   if (S.is_error()) {
     LOG(WARNING) << "failed to send broadcast: " << S;
@@ -412,6 +448,15 @@ void OverlayImpl::send_broadcast(PublicKeyHash send_as, td::uint32 flags, td::Bu
 }
 
 void OverlayImpl::send_broadcast_fec(PublicKeyHash send_as, td::uint32 flags, td::BufferSlice data) {
+  if (neighbours_.empty()) {
+    // TODO: limit retries
+    delay_action(
+        [SelfId = actor_id(this), send_as, flags, data = std::move(data)]() mutable {
+          td::actor::send_closure(SelfId, &OverlayImpl::send_broadcast_fec, send_as, flags, std::move(data));
+        },
+        td::Timestamp::in(0.5));
+    return;
+  }
   OverlayOutboundFecBroadcast::create(std::move(data), flags, actor_id(this), send_as);
 }
 
@@ -503,7 +548,7 @@ void OverlayImpl::send_new_fec_broadcast_part(PublicKeyHash local_id, Overlay::B
 }
 
 void OverlayImpl::deliver_broadcast(PublicKeyHash source, td::BufferSlice data) {
-  if (!subscribed()) {
+  if (is_external()) {
     return;
   }
   callback_->receive_broadcast(source, overlay_id_, std::move(data));
@@ -578,7 +623,8 @@ void OverlayImpl::set_privacy_rules(OverlayPrivacyRules rules) {
 }
 
 void OverlayImpl::check_broadcast(PublicKeyHash src, td::BufferSlice data, td::Promise<td::Unit> promise) {
-  if (!subscribed()) {
+  if (is_external()) {
+    promise.set_result(td::Unit());
     return;
   }
   callback_->check_broadcast(src, overlay_id_, std::move(data), std::move(promise));
diff --git a/overlay/overlay.hpp b/overlay/overlay.hpp
index ddcb0267..59b3ec06 100644
--- a/overlay/overlay.hpp
+++ b/overlay/overlay.hpp
@@ -251,15 +251,13 @@ class OverlayImpl : public Overlay {
   }
 
  private:
-  bool subscribed() const {
-    return (bool)callback_;
+  bool is_external() const {
+    return callback_ == nullptr;
   }
 
   template <class T>
   void process_query(adnl::AdnlNodeIdShort src, T &query, td::Promise<td::BufferSlice> promise) {
-    if (!subscribed()) {
-      return;
-    }
+    CHECK(!is_external());
     callback_->receive_query(src, overlay_id_, serialize_tl_object(&query, true), std::move(promise));
   }
 
diff --git a/overlay/overlays.h b/overlay/overlays.h
index 6781b6c3..82617fab 100644
--- a/overlay/overlays.h
+++ b/overlay/overlays.h
@@ -194,8 +194,8 @@ class Overlays : public td::actor::Actor {
 
   virtual void create_public_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
                                      std::unique_ptr<Callback> callback, OverlayPrivacyRules rules, td::string scope) = 0;
-  virtual void create_public_overlay_no_subscribe(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
-                                                  OverlayPrivacyRules rules, td::string scope) = 0;
+  virtual void create_public_overlay_external(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
+                                              OverlayPrivacyRules rules, td::string scope) = 0;
   virtual void create_private_overlay(adnl::AdnlNodeIdShort local_id, OverlayIdFull overlay_id,
                                       std::vector<adnl::AdnlNodeIdShort> nodes, std::unique_ptr<Callback> callback,
                                       OverlayPrivacyRules rules) = 0;
diff --git a/test/test-ton-collator.cpp b/test/test-ton-collator.cpp
index 1e46bc7d..b3d3f9db 100644
--- a/test/test-ton-collator.cpp
+++ b/test/test-ton-collator.cpp
@@ -323,7 +323,7 @@ class TestNode : public td::actor::Actor {
         td::actor::send_closure(id_, &ton::validator::ValidatorManager::sync_complete,
                                 td::PromiseCreator::lambda([](td::Unit) {}));
       }
-      void subscribe_to_shard(ton::ShardIdFull) override {
+      void update_shard_configuration(td::Ref<ton::validator::MasterchainState> state) override {
       }
       void send_ihr_message(ton::AccountIdPrefixFull dst, td::BufferSlice data) override {
       }
diff --git a/ton/ton-types.h b/ton/ton-types.h
index 754fb86a..7d0101d1 100644
--- a/ton/ton-types.h
+++ b/ton/ton-types.h
@@ -57,6 +57,8 @@ constexpr unsigned min_split_merge_interval = 30;  // split/merge interval must
 constexpr unsigned max_split_merge_delay =
     1000;  // end of split/merge interval must be at most 1000 seconds in the future
 
+constexpr int max_shard_pfx_len = 60;
+
 enum GlobalCapabilities {
   capIhrEnabled = 1,
   capCreateStatsEnabled = 2,
diff --git a/validator-engine/validator-engine.cpp b/validator-engine/validator-engine.cpp
index 09526279..1bb820a4 100644
--- a/validator-engine/validator-engine.cpp
+++ b/validator-engine/validator-engine.cpp
@@ -1324,18 +1324,6 @@ td::Status ValidatorEngine::load_global_config() {
   }
 
   validator_options_ = ton::validator::ValidatorManagerOptions::create(zero_state, init_block);
-  validator_options_.write().set_shard_check_function(
-      [masterchain_only = masterchain_only_](ton::ShardIdFull shard, ton::CatchainSeqno cc_seqno,
-         ton::validator::ValidatorManagerOptions::ShardCheckMode mode) -> bool {
-        if (mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_monitor) {
-          return shard.is_masterchain() || !masterchain_only;
-        }
-        CHECK(mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_validate);
-        return true;
-        /*ton::ShardIdFull p{ton::basechainId, ((cc_seqno * 1ull % 4) << 62) + 1};
-        auto s = ton::shard_prefix(p, 2);
-        return shard.is_masterchain() || ton::shard_intersects(shard, s);*/
-      });
   if (state_ttl_ != 0) {
     validator_options_.write().set_state_ttl(state_ttl_);
   }
@@ -1389,6 +1377,39 @@ td::Status ValidatorEngine::load_global_config() {
   return td::Status::OK();
 }
 
+void ValidatorEngine::init_validator_options() {
+  if (!masterchain_only_) {
+    validator_options_.write().set_shard_check_function(
+        [](ton::ShardIdFull shard, ton::CatchainSeqno cc_seqno,
+           ton::validator::ValidatorManagerOptions::ShardCheckMode mode) -> bool {
+          if (mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_monitor) {
+            return true;
+          }
+          CHECK(mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_validate);
+          return true;
+        });
+  } else {
+    std::vector<ton::ShardIdFull> shards = {ton::ShardIdFull(ton::masterchainId)};
+    for (const auto& c : config_.collators) {
+      shards.push_back(c.shard);
+    }
+    validator_options_.write().set_shard_check_function(
+        [shards = std::move(shards)](ton::ShardIdFull shard, ton::CatchainSeqno cc_seqno,
+                                               ton::validator::ValidatorManagerOptions::ShardCheckMode mode) -> bool {
+          if (mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_monitor) {
+            for (auto s : shards) {
+              if (shard_is_ancestor(shard, s)) {
+                return true;
+              }
+            }
+            return false;
+          }
+          CHECK(mode == ton::validator::ValidatorManagerOptions::ShardCheckMode::m_validate);
+          return true;
+        });
+  }
+}
+
 void ValidatorEngine::load_empty_local_config(td::Promise<td::Unit> promise) {
   auto ret_promise = td::PromiseCreator::lambda(
       [SelfId = actor_id(this), promise = std::move(promise)](td::Result<td::Unit> R) mutable {
@@ -1671,6 +1692,7 @@ void ValidatorEngine::got_key(ton::PublicKey key) {
 }
 
 void ValidatorEngine::start() {
+  init_validator_options();
   read_config_ = true;
   start_adnl();
 }
@@ -1825,19 +1847,22 @@ void ValidatorEngine::start_full_node() {
       };
       full_node_client_ = ton::adnl::AdnlExtMultiClient::create(std::move(vec), std::make_unique<Cb>());
     }
+    auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Unit> R) {
+      R.ensure();
+      td::actor::send_closure(SelfId, &ValidatorEngine::started_full_node);
+    });
     full_node_ = ton::validator::fullnode::FullNode::create(
         short_id, ton::adnl::AdnlNodeIdShort{config_.full_node}, validator_options_->zero_block_id().file_hash,
-        keyring_.get(), adnl_.get(), rldp_.get(),
+        validator_options_, keyring_.get(), adnl_.get(), rldp_.get(),
         default_dht_node_.is_zero() ? td::actor::ActorId<ton::dht::Dht>{} : dht_nodes_[default_dht_node_].get(),
-        overlay_manager_.get(), validator_manager_.get(), full_node_client_.get(), db_root_);
+        overlay_manager_.get(), validator_manager_.get(), full_node_client_.get(), db_root_, std::move(P));
+    for (auto &v : config_.validators) {
+      td::actor::send_closure(full_node_, &ton::validator::fullnode::FullNode::add_permanent_key, v.first,
+                              [](td::Unit) {});
+    }
+  } else {
+    started_full_node();
   }
-
-  for (auto &v : config_.validators) {
-    td::actor::send_closure(full_node_, &ton::validator::fullnode::FullNode::add_permanent_key, v.first,
-                            [](td::Unit) {});
-  }
-
-  started_full_node();
 }
 
 void ValidatorEngine::started_full_node() {
diff --git a/validator-engine/validator-engine.hpp b/validator-engine/validator-engine.hpp
index 037288ce..bf47e2d7 100644
--- a/validator-engine/validator-engine.hpp
+++ b/validator-engine/validator-engine.hpp
@@ -276,6 +276,7 @@ class ValidatorEngine : public td::actor::Actor {
   void load_empty_local_config(td::Promise<td::Unit> promise);
   void load_local_config(td::Promise<td::Unit> promise);
   void load_config(td::Promise<td::Unit> promise);
+  void init_validator_options();
 
   void start();
 
diff --git a/validator/fabric.h b/validator/fabric.h
index 6f06dcc9..12452ec5 100644
--- a/validator/fabric.h
+++ b/validator/fabric.h
@@ -52,7 +52,7 @@ void run_check_external_message(td::BufferSlice data, td::actor::ActorId<Validat
 
 void run_accept_block_query(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                             td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                            td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast,
+                            td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast, bool apply,
                             td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise);
 void run_fake_accept_block_query(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                                  td::Ref<ValidatorSet> validator_set, td::actor::ActorId<ValidatorManager> manager,
@@ -61,7 +61,7 @@ void run_hardfork_accept_block_query(BlockIdExt id, td::Ref<BlockData> data,
                                      td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise);
 void run_broadcast_only_accept_block_query(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                                            td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                                           td::Ref<BlockSignatureSet> approve_signatures,
+                                           td::Ref<BlockSignatureSet> approve_signatures, bool send_block_broadcast,
                                            td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise);
 void run_apply_block_query(BlockIdExt id, td::Ref<BlockData> block, BlockIdExt masterchain_block_id,
                            td::actor::ActorId<ValidatorManager> manager, td::Timestamp timeout,
diff --git a/validator/full-node-shard.cpp b/validator/full-node-shard.cpp
index 8e579f3c..7eb00db8 100644
--- a/validator/full-node-shard.cpp
+++ b/validator/full-node-shard.cpp
@@ -69,7 +69,7 @@ void Neighbour::update_roundtrip(double t) {
 }
 
 void FullNodeShardImpl::create_overlay() {
-  if (subscribed_) {
+  if (active_) {
     class Callback : public overlay::Overlays::Callback {
      public:
       void receive_message(adnl::AdnlNodeIdShort src, overlay::OverlayIdShort overlay_id,
@@ -99,7 +99,7 @@ void FullNodeShardImpl::create_overlay() {
                             PSTRING() << "{ \"type\": \"shard\", \"shard_id\": " << get_shard()
                                       << ", \"workchain_id\": " << get_workchain() << " }");
   } else {
-    td::actor::send_closure(overlays_, &overlay::Overlays::create_public_overlay_no_subscribe, adnl_id_,
+    td::actor::send_closure(overlays_, &overlay::Overlays::create_public_overlay_external, adnl_id_,
                             overlay_id_full_.clone(), rules_,
                             PSTRING() << "{ \"type\": \"shard\", \"shard_id\": " << get_shard()
                                       << ", \"workchain_id\": " << get_workchain() << " }");
@@ -129,12 +129,12 @@ void FullNodeShardImpl::update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promis
   create_overlay();
 }
 
-void FullNodeShardImpl::subscribe_to_shard() {
-  if (subscribed_ || !client_.empty()) {
+void FullNodeShardImpl::set_active(bool active) {
+  if (active_ == active || shard_.is_masterchain()) {
     return;
   }
   td::actor::send_closure(overlays_, &ton::overlay::Overlays::delete_overlay, adnl_id_, overlay_id_);
-  subscribed_ = true;
+  active_ = active;
   create_overlay();
 }
 
@@ -576,6 +576,10 @@ void FullNodeShardImpl::process_query(adnl::AdnlNodeIdShort src, ton_api::tonNod
 
 void FullNodeShardImpl::receive_query(adnl::AdnlNodeIdShort src, td::BufferSlice query,
                                       td::Promise<td::BufferSlice> promise) {
+  if (!active_) {
+    promise.set_error(td::Status::Error("shard is inactive"));
+    return;
+  }
   auto B = fetch_tl_object<ton_api::Function>(std::move(query), true);
   if (B.is_error()) {
     promise.set_error(td::Status::Error(ErrorCode::protoviolation, "cannot parse tonnode query"));
@@ -596,28 +600,23 @@ void FullNodeShardImpl::process_broadcast(PublicKeyHash src, ton_api::tonNode_ex
 
 void FullNodeShardImpl::process_broadcast(PublicKeyHash src, ton_api::tonNode_newShardBlockBroadcast &query) {
   auto block_id = create_block_id(query.block_->block_);
-  if (block_id.shard_full() != shard_) {
-    LOG(WARNING) << "dropping newShardBlockBroadcast: expected shard " << shard_.to_str() << ", got shard "
-                 << block_id.shard_full().to_str();
-    return;
-  }
   td::actor::send_closure(validator_manager_, &ValidatorManagerInterface::new_shard_block,
                           block_id, query.block_->cc_seqno_,
                           std::move(query.block_->data_));
 }
 
 void FullNodeShardImpl::process_broadcast(PublicKeyHash src, ton_api::tonNode_blockBroadcast &query) {
+  BlockIdExt block_id = create_block_id(query.id_);
+  if (block_id.shard_full() != shard_) {
+    LOG(FULL_NODE_WARNING) << "dropping block broadcast: shard mismatch. overlay=" << shard_.to_str()
+                           << " block=" << block_id.to_str();
+    return;
+  }
+
   std::vector<BlockSignature> signatures;
   for (auto &sig : query.signatures_) {
     signatures.emplace_back(BlockSignature{sig->who_, std::move(sig->signature_)});
   }
-
-  BlockIdExt block_id = create_block_id(query.id_);
-  if (block_id.shard_full() != shard_) {
-    LOG(WARNING) << "dropping blockBroadcast: expected shard " << shard_.to_str() << ", got shard "
-                 << block_id.shard_full().to_str();
-    return;
-  }
   BlockBroadcast B{block_id,
                    std::move(signatures),
                    static_cast<UnixTime>(query.catchain_seqno_),
@@ -639,6 +638,9 @@ void FullNodeShardImpl::process_broadcast(PublicKeyHash src, ton_api::tonNode_bl
 }
 
 void FullNodeShardImpl::receive_broadcast(PublicKeyHash src, td::BufferSlice broadcast) {
+  if (!active_) {
+    return;
+  }
   auto B = fetch_tl_object<ton_api::tonNode_Broadcast>(std::move(broadcast), true);
   if (B.is_error()) {
     return;
@@ -1087,7 +1089,7 @@ FullNodeShardImpl::FullNodeShardImpl(ShardIdFull shard, PublicKeyHash local_id,
                                      td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
                                      td::actor::ActorId<overlay::Overlays> overlays,
                                      td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-                                     td::actor::ActorId<adnl::AdnlExtClient> client, bool subscribe)
+                                     td::actor::ActorId<adnl::AdnlExtClient> client, bool active)
     : shard_(shard)
     , local_id_(local_id)
     , adnl_id_(adnl_id)
@@ -1098,7 +1100,7 @@ FullNodeShardImpl::FullNodeShardImpl(ShardIdFull shard, PublicKeyHash local_id,
     , overlays_(overlays)
     , validator_manager_(validator_manager)
     , client_(client)
-    , subscribed_(subscribe) {
+    , active_(shard.is_masterchain() || active) {
 }
 
 td::actor::ActorOwn<FullNodeShard> FullNodeShard::create(
@@ -1106,9 +1108,9 @@ td::actor::ActorOwn<FullNodeShard> FullNodeShard::create(
     td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<adnl::Adnl> adnl,
     td::actor::ActorId<rldp::Rldp> rldp, td::actor::ActorId<overlay::Overlays> overlays,
     td::actor::ActorId<ValidatorManagerInterface> validator_manager, td::actor::ActorId<adnl::AdnlExtClient> client,
-    bool subscribe) {
+    bool active) {
   return td::actor::create_actor<FullNodeShardImpl>("tonnode", shard, local_id, adnl_id, zero_state_file_hash, keyring,
-                                                    adnl, rldp, overlays, validator_manager, client, subscribe);
+                                                    adnl, rldp, overlays, validator_manager, client, active);
 }
 
 }  // namespace fullnode
diff --git a/validator/full-node-shard.h b/validator/full-node-shard.h
index e45e2325..2b2098a6 100644
--- a/validator/full-node-shard.h
+++ b/validator/full-node-shard.h
@@ -36,7 +36,7 @@ class FullNodeShard : public td::actor::Actor {
   virtual ShardIdFull get_shard_full() const = 0;
 
   virtual void update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promise<td::Unit> promise) = 0;
-  virtual void subscribe_to_shard() = 0;
+  virtual void set_active(bool active) = 0;
 
   virtual void send_ihr_message(td::BufferSlice data) = 0;
   virtual void send_external_message(td::BufferSlice data) = 0;
@@ -72,7 +72,7 @@ class FullNodeShard : public td::actor::Actor {
       td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<adnl::Adnl> adnl,
       td::actor::ActorId<rldp::Rldp> rldp, td::actor::ActorId<overlay::Overlays> overlays,
       td::actor::ActorId<ValidatorManagerInterface> validator_manager, td::actor::ActorId<adnl::AdnlExtClient> client,
-      bool subscribe);
+      bool active = true);
 };
 
 }  // namespace fullnode
diff --git a/validator/full-node-shard.hpp b/validator/full-node-shard.hpp
index 33705bc7..9a022cbf 100644
--- a/validator/full-node-shard.hpp
+++ b/validator/full-node-shard.hpp
@@ -80,7 +80,7 @@ class FullNodeShardImpl : public FullNodeShard {
 
   void create_overlay();
   void update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promise<td::Unit> promise) override;
-  virtual void subscribe_to_shard() override;
+  void set_active(bool active) override;
 
   //td::Result<Block> fetch_block(td::BufferSlice data);
   void prevalidate_block(BlockIdExt block_id, td::BufferSlice data, td::BufferSlice proof,
@@ -204,7 +204,7 @@ class FullNodeShardImpl : public FullNodeShard {
                     td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
                     td::actor::ActorId<overlay::Overlays> overlays,
                     td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-                    td::actor::ActorId<adnl::AdnlExtClient> client, bool subscribe);
+                    td::actor::ActorId<adnl::AdnlExtClient> client, bool active = true);
 
  private:
   bool use_new_download() const {
@@ -242,7 +242,7 @@ class FullNodeShardImpl : public FullNodeShard {
   td::Timestamp ping_neighbours_at_;
   adnl::AdnlNodeIdShort last_pinged_neighbour_ = adnl::AdnlNodeIdShort::zero();
 
-  bool subscribed_ = false;
+  bool active_ = false;
 };
 
 }  // namespace fullnode
diff --git a/validator/full-node.cpp b/validator/full-node.cpp
index 5712d3cf..9c26cf3c 100644
--- a/validator/full-node.cpp
+++ b/validator/full-node.cpp
@@ -20,6 +20,7 @@
 #include "ton/ton-shard.h"
 #include "ton/ton-io.hpp"
 #include "td/actor/MultiPromise.h"
+#include "ton/ton-types.h"
 
 namespace ton {
 
@@ -27,6 +28,8 @@ namespace validator {
 
 namespace fullnode {
 
+static const double INACTIVE_SHARD_TTL = 120.0;
+
 void FullNodeImpl::add_permanent_key(PublicKeyHash key, td::Promise<td::Unit> promise) {
   if (local_keys_.count(key)) {
     promise.set_value(td::Unit());
@@ -47,7 +50,9 @@ void FullNodeImpl::add_permanent_key(PublicKeyHash key, td::Promise<td::Unit> pr
   }
 
   for (auto &shard : shards_) {
-    td::actor::send_closure(shard.second, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    if (!shard.second.actor.empty()) {
+      td::actor::send_closure(shard.second.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    }
   }
   promise.set_value(td::Unit());
 }
@@ -71,7 +76,9 @@ void FullNodeImpl::del_permanent_key(PublicKeyHash key, td::Promise<td::Unit> pr
   }
 
   for (auto &shard : shards_) {
-    td::actor::send_closure(shard.second, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    if (!shard.second.actor.empty()) {
+      td::actor::send_closure(shard.second.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    }
   }
   promise.set_value(td::Unit());
 }
@@ -79,22 +86,25 @@ void FullNodeImpl::del_permanent_key(PublicKeyHash key, td::Promise<td::Unit> pr
 void FullNodeImpl::sign_shard_overlay_certificate(ShardIdFull shard_id, PublicKeyHash signed_key,
                                                   td::uint32 expiry_at, td::uint32 max_size,
                                                   td::Promise<td::BufferSlice> promise) {
-    auto it = shards_.find(shard_id);
-    if(it == shards_.end()) {
-      promise.set_error(td::Status::Error(ErrorCode::error, "shard not found"));
-      return;
-    }
-    td::actor::send_closure(it->second, &FullNodeShard::sign_overlay_certificate, signed_key, expiry_at, max_size, std::move(promise));
+  auto it = shards_.find(shard_id);
+  if(it == shards_.end() || it->second.actor.empty()) {
+    promise.set_error(td::Status::Error(ErrorCode::error, "shard not found"));
+    return;
+  }
+  td::actor::send_closure(it->second.actor, &FullNodeShard::sign_overlay_certificate, signed_key, expiry_at, max_size,
+                          std::move(promise));
 }
 
 void FullNodeImpl::import_shard_overlay_certificate(ShardIdFull shard_id, PublicKeyHash signed_key,
                                                     std::shared_ptr<ton::overlay::Certificate> cert,
                                                     td::Promise<td::Unit> promise) {
-    auto it = shards_.find(shard_id);
-    if(it == shards_.end()) {
-      promise.set_error(td::Status::Error(ErrorCode::error, "shard not found"));
-    }
-    td::actor::send_closure(it->second, &FullNodeShard::import_overlay_certificate, signed_key, cert, std::move(promise));
+  auto it = shards_.find(shard_id);
+  if(it == shards_.end() || it->second.actor.empty()) {
+    promise.set_error(td::Status::Error(ErrorCode::error, "shard not found"));
+    return;
+  }
+  td::actor::send_closure(it->second.actor, &FullNodeShard::import_overlay_certificate, signed_key, cert,
+                          std::move(promise));
 }
 
 void FullNodeImpl::update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promise<td::Unit> promise) {
@@ -105,7 +115,9 @@ void FullNodeImpl::update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promise<td:
   ig.add_promise(std::move(promise));
 
   for (auto &s : shards_) {
-    td::actor::send_closure(s.second, &FullNodeShard::update_adnl_id, adnl_id, ig.get_promise());
+    if (!s.second.actor.empty()) {
+      td::actor::send_closure(s.second.actor, &FullNodeShard::update_adnl_id, adnl_id, ig.get_promise());
+    }
   }
   local_id_ = adnl_id_.pubkey_hash();
 }
@@ -116,34 +128,116 @@ void FullNodeImpl::initial_read_complete(BlockHandle top_handle) {
     td::actor::send_closure(SelfId, &FullNodeImpl::sync_completed);
   });
   auto it = shards_.find(ShardIdFull{masterchainId});
-  CHECK(it != shards_.end());
-  td::actor::send_closure(it->second, &FullNodeShard::set_handle, top_handle, std::move(P));
+  CHECK(it != shards_.end() && !it->second.actor.empty());
+  td::actor::send_closure(it->second.actor, &FullNodeShard::set_handle, top_handle, std::move(P));
 }
 
-void FullNodeImpl::add_shard(ShardIdFull shard, bool subscribe) {
-  while (true) {
-    auto it = shards_.find(shard);
-    if (it == shards_.end()) {
-      shards_.emplace(shard, FullNodeShard::create(shard, local_id_, adnl_id_, zero_state_file_hash_, keyring_, adnl_,
-                                                   rldp_, overlays_, validator_manager_, client_, subscribe));
-      if (all_validators_.size() > 0) {
-        td::actor::send_closure(shards_[shard], &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+void FullNodeImpl::update_shard_configuration(td::Ref<MasterchainState> state) {
+  std::map<ShardIdFull, BlockIdExt> new_shards;
+  std::set<ShardIdFull> new_active;
+  new_shards[ShardIdFull(masterchainId)] = state->get_block_id();
+  new_active.insert(ShardIdFull(masterchainId));
+  std::set<WorkchainId> workchains;
+  auto cur_time = state->get_unix_time();
+
+  auto set_active = [&](ShardIdFull shard) {
+    while (new_active.insert(shard).second && shard.pfx_len() > 0) {
+      shard = shard_parent(shard);
+    }
+  };
+
+  for (auto &info : state->get_shards()) {
+    auto shard = info->shard();
+    workchains.insert(shard.workchain);
+    new_shards[shard] = info->top_block_id();
+    bool will_split = shard.pfx_len() < max_shard_pfx_len && ((info->fsm_state() == McShardHash::FsmState::fsm_split &&
+                      info->fsm_utime() < cur_time + 60) || info->before_split());
+    bool will_merge = shard.pfx_len() > 0 && ((info->fsm_state() == McShardHash::FsmState::fsm_merge &&
+                      info->fsm_utime() < cur_time + 60) || info->before_merge());
+    if (opts_->need_monitor(shard)) {
+      set_active(shard);
+    }
+    if (will_merge && opts_->need_monitor(shard_parent(shard))) {
+      set_active(shard);
+      set_active(shard_sibling(shard));
+    }
+    for (int id = 0; id < 2; ++id) {
+      if (will_split && opts_->need_monitor(shard_child(shard, id))) {
+        set_active(shard_child(shard, id));
       }
-    } else if (subscribe) {
-      td::actor::send_closure(it->second, &FullNodeShard::subscribe_to_shard);
+    }
+  }
+  for (const auto &wpair : state->get_workchain_list()) {
+    ton::WorkchainId wc = wpair.first;
+    const block::WorkchainInfo *winfo = wpair.second.get();
+    if (workchains.count(wc) == 0 && winfo->active && winfo->enabled_since <= cur_time) {
+      auto shard = ShardIdFull(wc);
+      new_shards[shard] = BlockIdExt(wc, shard.shard, 0, winfo->zerostate_root_hash, winfo->zerostate_file_hash);
+      if (opts_->need_monitor(shard)) {
+        set_active(shard);
+      }
+    }
+  }
+
+  auto info_set_active = [&](ShardIdFull shard, ShardInfo& info, bool active) {
+    if (info.active == active) {
+      return;
+    }
+    if (info.actor.empty()) {
+      add_shard_actor(shard, active);
+      return;
+    }
+    info.active = active;
+    td::actor::send_closure(info.actor, &FullNodeShard::set_active, active);
+    info.delete_at = active ? td::Timestamp::never() : td::Timestamp::in(INACTIVE_SHARD_TTL);
+  };
+
+  for (auto shard : new_shards) {
+    auto &info = shards_[shard.first];
+    info.exists = true;
+    if (!info.active && new_active.count(shard.first)) {
+      td::actor::send_closure(validator_manager_, &ValidatorManagerInterface::wait_block_state_short, shard.second, 0,
+                              td::Timestamp::in(60.0), [](td::Result<td::Ref<ShardState>>){});
+    }
+  }
+
+  for (auto& p : shards_) {
+    ShardIdFull shard = p.first;
+    ShardInfo &info = p.second;
+    info.exists = new_shards.count(shard);
+    info_set_active(shard, info, new_active.count(shard));
+  }
+
+  for (ShardIdFull shard : new_active) {
+    info_set_active(shard, shards_[shard], true);
+  }
+
+  auto it = shards_.begin();
+  while (it != shards_.end()) {
+    if (!it->second.active && it->second.delete_at && it->second.delete_at.is_in_past()) {
+      it->second.actor.reset();
+      it->second.delete_at = td::Timestamp::never();
+    }
+    if (!it->second.exists && it->second.actor.empty()) {
+      it = shards_.erase(it);
     } else {
-      break;
+      ++it;
     }
-    if (shard.shard == shardIdAll) {
-      break;
-    }
-    shard = shard_parent(shard);
   }
 }
 
-void FullNodeImpl::del_shard(ShardIdFull shard) {
-  LOG(FATAL) << "deleting shards not implemented: shard=" << shard;
-  shards_.erase(shard);
+void FullNodeImpl::add_shard_actor(ShardIdFull shard, bool active) {
+  ShardInfo &info = shards_[shard];
+  if (!info.actor.empty()) {
+    return;
+  }
+  info.actor = FullNodeShard::create(shard, local_id_, adnl_id_, zero_state_file_hash_, keyring_, adnl_, rldp_,
+                                     overlays_, validator_manager_, client_, active);
+  info.active = active;
+  info.delete_at = active ? td::Timestamp::never() : td::Timestamp::in(INACTIVE_SHARD_TTL);
+  if (all_validators_.size() > 0) {
+    td::actor::send_closure(info.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+  }
 }
 
 void FullNodeImpl::sync_completed() {
@@ -169,7 +263,7 @@ void FullNodeImpl::send_ext_message(AccountIdPrefixFull dst, td::BufferSlice dat
 }
 
 void FullNodeImpl::send_shard_block_info(BlockIdExt block_id, CatchainSeqno cc_seqno, td::BufferSlice data) {
-  auto shard = get_shard(block_id.shard_full());
+  auto shard = get_shard(ShardIdFull{masterchainId});
   if (shard.empty()) {
     VLOG(FULL_NODE_WARNING) << "dropping OUT shard block info message to unknown shard";
     return;
@@ -178,7 +272,7 @@ void FullNodeImpl::send_shard_block_info(BlockIdExt block_id, CatchainSeqno cc_s
 }
 
 void FullNodeImpl::send_broadcast(BlockBroadcast broadcast) {
-  auto shard = get_shard(broadcast.block_id.shard_full());
+  auto shard = get_shard(broadcast.block_id.shard_full(), true);
   if (shard.empty()) {
     VLOG(FULL_NODE_WARNING) << "dropping OUT broadcast to unknown shard";
     return;
@@ -262,19 +356,38 @@ void FullNodeImpl::download_archive(BlockSeqno masterchain_seqno, std::string tm
                           std::move(promise));
 }
 
-td::actor::ActorId<FullNodeShard> FullNodeImpl::get_shard(ShardIdFull shard) {
-  add_shard(ShardIdFull{shard.workchain, shardIdAll});
-  while (shards_.count(shard) == 0) {
-    if (shard.shard == shardIdAll) {
-      return td::actor::ActorId<FullNodeShard>{};
+td::actor::ActorId<FullNodeShard> FullNodeImpl::get_shard(ShardIdFull shard, bool exact) {
+  if (!exact) {
+    ShardIdFull s = shard;
+    while (true) {
+      auto it = shards_.find(s);
+      if (it != shards_.end() && it->second.exists) {
+        if (it->second.actor.empty()) {
+          add_shard_actor(s, false);
+        }
+        if (!it->second.active) {
+          it->second.delete_at = td::Timestamp::in(INACTIVE_SHARD_TTL);
+        }
+        return it->second.actor.get();
+      }
+      if (s.pfx_len() == 0) {
+        break;
+      }
+      s = shard_parent(s);
     }
-    shard = shard_parent(shard);
   }
-  return shards_[shard].get();
+  auto &info = shards_[shard];
+  if (info.actor.empty()) {
+    add_shard_actor(shard, false);
+  }
+  if (!info.active) {
+    info.delete_at = td::Timestamp::in(INACTIVE_SHARD_TTL);
+  }
+  return info.actor.get();
 }
 
 td::actor::ActorId<FullNodeShard> FullNodeImpl::get_shard(AccountIdPrefixFull dst) {
-  return get_shard(shard_prefix(dst, 60));
+  return get_shard(shard_prefix(dst, max_shard_pfx_len));
 }
 
 void FullNodeImpl::got_key_block_proof(td::Ref<ProofLink> proof) {
@@ -307,7 +420,7 @@ void FullNodeImpl::got_key_block_proof(td::Ref<ProofLink> proof) {
   CHECK(all_validators_.size() > 0);
 
   for (auto &shard : shards_) {
-    td::actor::send_closure(shard.second, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    td::actor::send_closure(shard.second.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
   }
 }
 
@@ -339,7 +452,9 @@ void FullNodeImpl::got_zero_block_state(td::Ref<ShardState> state) {
   CHECK(all_validators_.size() > 0);
 
   for (auto &shard : shards_) {
-    td::actor::send_closure(shard.second, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    if (!shard.second.actor.empty()) {
+      td::actor::send_closure(shard.second.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
+    }
   }
 }
 
@@ -384,8 +499,8 @@ void FullNodeImpl::start_up() {
     void initial_read_complete(BlockHandle handle) override {
       td::actor::send_closure(id_, &FullNodeImpl::initial_read_complete, handle);
     }
-    void subscribe_to_shard(ShardIdFull shard) override {
-      td::actor::send_closure(id_, &FullNodeImpl::add_shard, shard, true);
+    void update_shard_configuration(td::Ref<MasterchainState> state) override {
+      td::actor::send_closure(id_, &FullNodeImpl::update_shard_configuration, std::move(state));
     }
     void send_ihr_message(AccountIdPrefixFull dst, td::BufferSlice data) override {
       td::actor::send_closure(id_, &FullNodeImpl::send_ihr_message, dst, std::move(data));
@@ -443,20 +558,21 @@ void FullNodeImpl::start_up() {
     td::actor::ActorId<FullNodeImpl> id_;
   };
 
-  auto P = td::PromiseCreator::lambda([](td::Unit R) {});
   td::actor::send_closure(validator_manager_, &ValidatorManagerInterface::install_callback,
-                          std::make_unique<Callback>(actor_id(this)), std::move(P));
+                          std::make_unique<Callback>(actor_id(this)), std::move(started_promise_));
 }
 
 FullNodeImpl::FullNodeImpl(PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id, FileHash zero_state_file_hash,
-                           td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<adnl::Adnl> adnl,
-                           td::actor::ActorId<rldp::Rldp> rldp, td::actor::ActorId<dht::Dht> dht,
-                           td::actor::ActorId<overlay::Overlays> overlays,
+                           td::Ref<ValidatorManagerOptions> opts, td::actor::ActorId<keyring::Keyring> keyring,
+                           td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
+                           td::actor::ActorId<dht::Dht> dht, td::actor::ActorId<overlay::Overlays> overlays,
                            td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-                           td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root)
+                           td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root,
+                           td::Promise<td::Unit> started_promise)
     : local_id_(local_id)
     , adnl_id_(adnl_id)
     , zero_state_file_hash_(zero_state_file_hash)
+    , opts_(opts)
     , keyring_(keyring)
     , adnl_(adnl)
     , rldp_(rldp)
@@ -464,20 +580,23 @@ FullNodeImpl::FullNodeImpl(PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id
     , overlays_(overlays)
     , validator_manager_(validator_manager)
     , client_(client)
-    , db_root_(db_root) {
-  add_shard(ShardIdFull{masterchainId}, true);
+    , db_root_(db_root)
+    , started_promise_(std::move(started_promise)) {
+  add_shard_actor(ShardIdFull{masterchainId}, true);
 }
 
 td::actor::ActorOwn<FullNode> FullNode::create(ton::PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id,
-                                               FileHash zero_state_file_hash,
+                                               FileHash zero_state_file_hash, td::Ref<ValidatorManagerOptions> opts,
                                                td::actor::ActorId<keyring::Keyring> keyring,
                                                td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
                                                td::actor::ActorId<dht::Dht> dht,
                                                td::actor::ActorId<overlay::Overlays> overlays,
                                                td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-                                               td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root) {
-  return td::actor::create_actor<FullNodeImpl>("fullnode", local_id, adnl_id, zero_state_file_hash, keyring, adnl, rldp,
-                                               dht, overlays, validator_manager, client, db_root);
+                                               td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root,
+                                               td::Promise<td::Unit> started_promise) {
+  return td::actor::create_actor<FullNodeImpl>("fullnode", local_id, adnl_id, zero_state_file_hash, opts, keyring, adnl,
+                                               rldp, dht, overlays, validator_manager, client, db_root,
+                                               std::move(started_promise));
 }
 
 }  // namespace fullnode
diff --git a/validator/full-node.h b/validator/full-node.h
index cdf39d6f..7342a822 100644
--- a/validator/full-node.h
+++ b/validator/full-node.h
@@ -73,13 +73,14 @@ class FullNode : public td::actor::Actor {
   }
 
   static td::actor::ActorOwn<FullNode> create(ton::PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id,
-                                              FileHash zero_state_file_hash,
+                                              FileHash zero_state_file_hash, td::Ref<ValidatorManagerOptions> opts,
                                               td::actor::ActorId<keyring::Keyring> keyring,
                                               td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
                                               td::actor::ActorId<dht::Dht> dht,
                                               td::actor::ActorId<overlay::Overlays> overlays,
                                               td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-                                              td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root);
+                                              td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root,
+                                              td::Promise<td::Unit> started_promise);
 };
 
 }  // namespace fullnode
diff --git a/validator/full-node.hpp b/validator/full-node.hpp
index f3ce9d05..47cca0f5 100644
--- a/validator/full-node.hpp
+++ b/validator/full-node.hpp
@@ -52,8 +52,7 @@ class FullNodeImpl : public FullNode {
 
   void update_adnl_id(adnl::AdnlNodeIdShort adnl_id, td::Promise<td::Unit> promise) override;
 
-  void add_shard(ShardIdFull shard, bool subscribe = false);
-  void del_shard(ShardIdFull shard);
+  void update_shard_configuration(td::Ref<MasterchainState> state);
 
   void sync_completed();
 
@@ -82,21 +81,31 @@ class FullNodeImpl : public FullNode {
   void start_up() override;
 
   FullNodeImpl(PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id, FileHash zero_state_file_hash,
-               td::actor::ActorId<keyring::Keyring> keyring, td::actor::ActorId<adnl::Adnl> adnl,
-               td::actor::ActorId<rldp::Rldp> rldp, td::actor::ActorId<dht::Dht> dht,
-               td::actor::ActorId<overlay::Overlays> overlays,
+               td::Ref<ValidatorManagerOptions> opts, td::actor::ActorId<keyring::Keyring> keyring,
+               td::actor::ActorId<adnl::Adnl> adnl, td::actor::ActorId<rldp::Rldp> rldp,
+               td::actor::ActorId<dht::Dht> dht, td::actor::ActorId<overlay::Overlays> overlays,
                td::actor::ActorId<ValidatorManagerInterface> validator_manager,
-               td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root);
+               td::actor::ActorId<adnl::AdnlExtClient> client, std::string db_root,
+               td::Promise<td::Unit> started_promise);
 
  private:
+  void add_shard_actor(ShardIdFull shard, bool active);
+
   PublicKeyHash local_id_;
   adnl::AdnlNodeIdShort adnl_id_;
   FileHash zero_state_file_hash_;
+  td::Ref<ValidatorManagerOptions> opts_;
 
   td::actor::ActorId<FullNodeShard> get_shard(AccountIdPrefixFull dst);
-  td::actor::ActorId<FullNodeShard> get_shard(ShardIdFull dst);
+  td::actor::ActorId<FullNodeShard> get_shard(ShardIdFull shard, bool exact = false);
 
-  std::map<ShardIdFull, td::actor::ActorOwn<FullNodeShard>> shards_;
+  struct ShardInfo {
+    bool exists = false;
+    td::actor::ActorOwn<FullNodeShard> actor;
+    bool active = false;
+    td::Timestamp delete_at = td::Timestamp::never();
+  };
+  std::map<ShardIdFull, ShardInfo> shards_;
 
   td::actor::ActorId<keyring::Keyring> keyring_;
   td::actor::ActorId<adnl::Adnl> adnl_;
@@ -112,6 +121,8 @@ class FullNodeImpl : public FullNode {
   std::vector<PublicKeyHash> all_validators_;
 
   std::set<PublicKeyHash> local_keys_;
+
+  td::Promise<td::Unit> started_promise_;
 };
 
 }  // namespace fullnode
diff --git a/validator/impl/accept-block.cpp b/validator/impl/accept-block.cpp
index 74adcd69..6491a711 100644
--- a/validator/impl/accept-block.cpp
+++ b/validator/impl/accept-block.cpp
@@ -41,7 +41,7 @@ using namespace std::literals::string_literals;
 
 AcceptBlockQuery::AcceptBlockQuery(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                                    td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                                   td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast,
+                                   td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast, bool apply,
                                    td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise)
     : id_(id)
     , data_(std::move(data))
@@ -52,6 +52,7 @@ AcceptBlockQuery::AcceptBlockQuery(BlockIdExt id, td::Ref<BlockData> data, std::
     , is_fake_(false)
     , is_fork_(false)
     , send_broadcast_(send_broadcast)
+    , apply_(apply)
     , manager_(manager)
     , promise_(std::move(promise)) {
   state_keep_old_hash_.clear();
@@ -92,28 +93,6 @@ AcceptBlockQuery::AcceptBlockQuery(ForceFork ffork, BlockIdExt id, td::Ref<Block
   state_hash_.clear();
 }
 
-AcceptBlockQuery::AcceptBlockQuery(BroadcastOnly, BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
-                                   td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                                   td::Ref<BlockSignatureSet> approve_signatures,
-                                   td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise)
-    : id_(id)
-    , data_(std::move(data))
-    , prev_(std::move(prev))
-    , validator_set_(std::move(validator_set))
-    , signatures_(std::move(signatures))
-    , approve_signatures_(std::move(approve_signatures))
-    , is_fake_(false)
-    , is_fork_(false)
-    , send_broadcast_(true)
-    , broadcast_only_(false)
-    , manager_(manager)
-    , promise_(std::move(promise)) {
-  state_keep_old_hash_.clear();
-  state_old_hash_.clear();
-  state_hash_.clear();
-  CHECK(prev_.size() > 0);
-}
-
 bool AcceptBlockQuery::precheck_header() {
   VLOG(VALIDATOR_DEBUG) << "precheck_header()";
   // 0. sanity check
@@ -357,7 +336,9 @@ bool AcceptBlockQuery::check_send_error(td::actor::ActorId<AcceptBlockQuery> Sel
 }
 
 void AcceptBlockQuery::finish_query() {
-  ValidatorInvariants::check_post_accept(handle_);
+  if (apply_) {
+    ValidatorInvariants::check_post_accept(handle_);
+  }
   if (is_masterchain()) {
     CHECK(handle_->inited_proof());
   } else {
@@ -406,15 +387,6 @@ void AcceptBlockQuery::start_up() {
     return;
   }
 
-  if (broadcast_only_) {
-    if (!create_new_proof()) {
-      fatal_error("cannot generate proof for block "s + id_.to_str());
-      return;
-    }
-    applied();
-    return;
-  }
-
   td::actor::send_closure(
       manager_, &ValidatorManager::get_block_handle, id_, true, [SelfId = actor_id(this)](td::Result<BlockHandle> R) {
         check_send_error(SelfId, R) ||
@@ -479,6 +451,10 @@ void AcceptBlockQuery::written_block_signatures() {
 void AcceptBlockQuery::written_block_info() {
   VLOG(VALIDATOR_DEBUG) << "written block info";
   if (data_.not_null()) {
+    if (!apply_) {
+      written_state({});
+      return;
+    }
     auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<td::Ref<ShardState>> R) {
       check_send_error(SelfId, R) ||
           td::actor::send_closure_bool(SelfId, &AcceptBlockQuery::got_prev_state, R.move_as_ok());
@@ -555,7 +531,7 @@ void AcceptBlockQuery::written_state(td::Ref<ShardState> upd_state) {
     return;
   }
 
-  if (state_keep_old_hash_ != state_old_hash_) {
+  if (apply_ && state_keep_old_hash_ != state_old_hash_) {
     fatal_error(PSTRING() << "invalid previous state hash in newly-created proof: expected "
                           << state_->root_hash().to_hex() << ", found in update " << state_old_hash_.to_hex());
     return;
diff --git a/validator/impl/accept-block.hpp b/validator/impl/accept-block.hpp
index b45095b4..1a1f2a54 100644
--- a/validator/impl/accept-block.hpp
+++ b/validator/impl/accept-block.hpp
@@ -48,20 +48,15 @@ class AcceptBlockQuery : public td::actor::Actor {
  public:
   struct IsFake {};
   struct ForceFork {};
-  struct BroadcastOnly{};
   AcceptBlockQuery(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                    td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                   td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast,
+                   td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast, bool apply,
                    td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise);
   AcceptBlockQuery(IsFake fake, BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                    td::Ref<ValidatorSet> validator_set, td::actor::ActorId<ValidatorManager> manager,
                    td::Promise<td::Unit> promise);
   AcceptBlockQuery(ForceFork ffork, BlockIdExt id, td::Ref<BlockData> data,
                    td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise);
-  AcceptBlockQuery(BroadcastOnly, BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
-                   td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                   td::Ref<BlockSignatureSet> approve_signatures, td::actor::ActorId<ValidatorManager> manager,
-                   td::Promise<td::Unit> promise);
 
  private:
   static constexpr td::uint32 priority() {
@@ -103,7 +98,7 @@ class AcceptBlockQuery : public td::actor::Actor {
   bool is_fake_;
   bool is_fork_;
   bool send_broadcast_;
-  bool broadcast_only_{false};
+  bool apply_ = true;
   bool ancestors_split_{false}, is_key_block_{false};
   td::Timestamp timeout_ = td::Timestamp::in(600.0);
   td::actor::ActorId<ValidatorManager> manager_;
diff --git a/validator/impl/fabric.cpp b/validator/impl/fabric.cpp
index e86b9b90..47979af8 100644
--- a/validator/impl/fabric.cpp
+++ b/validator/impl/fabric.cpp
@@ -127,10 +127,10 @@ td::Result<td::Ref<IhrMessage>> create_ihr_message(td::BufferSlice data) {
 
 void run_accept_block_query(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
                             td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                            td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast,
+                            td::Ref<BlockSignatureSet> approve_signatures, bool send_broadcast, bool apply,
                             td::actor::ActorId<ValidatorManager> manager, td::Promise<td::Unit> promise) {
   td::actor::create_actor<AcceptBlockQuery>("accept", id, std::move(data), prev, std::move(validator_set),
-                                            std::move(signatures), std::move(approve_signatures), send_broadcast,
+                                            std::move(signatures), std::move(approve_signatures), send_broadcast, apply,
                                             manager, std::move(promise))
       .release();
 }
@@ -151,17 +151,6 @@ void run_hardfork_accept_block_query(BlockIdExt id, td::Ref<BlockData> data,
       .release();
 }
 
-void run_broadcast_only_accept_block_query(BlockIdExt id, td::Ref<BlockData> data, std::vector<BlockIdExt> prev,
-                                           td::Ref<ValidatorSet> validator_set, td::Ref<BlockSignatureSet> signatures,
-                                           td::Ref<BlockSignatureSet> approve_signatures,
-                                           td::actor::ActorId<ValidatorManager> manager,
-                                           td::Promise<td::Unit> promise) {
-  td::actor::create_actor<AcceptBlockQuery>("broadcastaccept", AcceptBlockQuery::BroadcastOnly(), id, std::move(data),
-                                            prev, std::move(validator_set), std::move(signatures),
-                                            std::move(approve_signatures), manager, std::move(promise))
-      .release();
-}
-
 void run_apply_block_query(BlockIdExt id, td::Ref<BlockData> block, BlockIdExt masterchain_block_id,
                            td::actor::ActorId<ValidatorManager> manager, td::Timestamp timeout,
                            td::Promise<td::Unit> promise) {
diff --git a/validator/interfaces/validator-manager.h b/validator/interfaces/validator-manager.h
index c72ec307..209f871f 100644
--- a/validator/interfaces/validator-manager.h
+++ b/validator/interfaces/validator-manager.h
@@ -64,10 +64,6 @@ class ValidatorManager : public ValidatorManagerInterface {
                                                std::function<td::Status(td::FileFd&)> write_data,
                                                td::Promise<td::Unit> promise) = 0;
   virtual void store_zero_state_file(BlockIdExt block_id, td::BufferSlice state, td::Promise<td::Unit> promise) = 0;
-  virtual void wait_block_state(BlockHandle handle, td::uint32 priority, td::Timestamp timeout,
-                                td::Promise<td::Ref<ShardState>> promise) = 0;
-  virtual void wait_block_state_short(BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
-                                      td::Promise<td::Ref<ShardState>> promise) = 0;
 
   virtual void set_block_data(BlockHandle handle, td::Ref<BlockData> data, td::Promise<td::Unit> promise) = 0;
   virtual void wait_block_data(BlockHandle handle, td::uint32 priority, td::Timestamp,
@@ -135,7 +131,7 @@ class ValidatorManager : public ValidatorManagerInterface {
 
   virtual void update_shard_client_state(BlockIdExt masterchain_block_id, td::Promise<td::Unit> promise) = 0;
   virtual void get_shard_client_state(bool from_db, td::Promise<BlockIdExt> promise) = 0;
-  virtual void subscribe_to_shard(ShardIdFull shard) = 0;
+  virtual void update_shard_configuration(td::Ref<MasterchainState> state) = 0;
 
   virtual void update_async_serializer_state(AsyncSerializerState state, td::Promise<td::Unit> promise) = 0;
   virtual void get_async_serializer_state(td::Promise<AsyncSerializerState> promise) = 0;
diff --git a/validator/manager-disk.hpp b/validator/manager-disk.hpp
index 91235ebf..501ee078 100644
--- a/validator/manager-disk.hpp
+++ b/validator/manager-disk.hpp
@@ -253,7 +253,7 @@ class ValidatorManagerImpl : public ValidatorManager {
 
   void update_shard_client_state(BlockIdExt masterchain_block_id, td::Promise<td::Unit> promise) override;
   void get_shard_client_state(bool from_db, td::Promise<BlockIdExt> promise) override;
-  void subscribe_to_shard(ShardIdFull shard) override {
+  void update_shard_configuration(td::Ref<MasterchainState> state) override {
   }
 
   void update_async_serializer_state(AsyncSerializerState state, td::Promise<td::Unit> promise) override {
diff --git a/validator/manager-hardfork.hpp b/validator/manager-hardfork.hpp
index 80f6df93..67782771 100644
--- a/validator/manager-hardfork.hpp
+++ b/validator/manager-hardfork.hpp
@@ -321,7 +321,8 @@ class ValidatorManagerImpl : public ValidatorManager {
   void get_shard_client_state(bool from_db, td::Promise<BlockIdExt> promise) override {
     UNREACHABLE();
   }
-  void subscribe_to_shard(ShardIdFull shard) override {
+  void update_shard_configuration(td::Ref<MasterchainState> state) override {
+    UNREACHABLE();
   }
 
   void update_async_serializer_state(AsyncSerializerState state, td::Promise<td::Unit> promise) override {
diff --git a/validator/manager.cpp b/validator/manager.cpp
index 9af00772..7c5e7d3f 100644
--- a/validator/manager.cpp
+++ b/validator/manager.cpp
@@ -377,7 +377,7 @@ void ValidatorManagerImpl::new_external_message(td::BufferSlice data) {
   }
   auto R = create_ext_message(std::move(data));
   if (R.is_error()) {
-    VLOG(VALIDATOR_NOTICE) << "dropping bad ihr message: " << R.move_as_error();
+    VLOG(VALIDATOR_NOTICE) << "dropping bad external message: " << R.move_as_error();
     return;
   }
   add_external_message(R.move_as_ok());
@@ -453,9 +453,9 @@ void ValidatorManagerImpl::add_shard_block_description(td::Ref<ShardTopBlockDesc
     }
     shard_blocks_[ShardTopBlockDescriptionId{desc->block_id().shard_full(), desc->catchain_seqno()}] = desc;
     VLOG(VALIDATOR_DEBUG) << "new shard block descr for " << desc->block_id();
-    if (last_masterchain_block_handle_ && last_masterchain_seqno_ > 0 &&
-        desc->generated_at() < last_masterchain_block_handle_->unix_time() + 60) {
-      delay_action(
+    if (opts_->need_monitor(desc->block_id().shard_full()) && last_masterchain_block_handle_ &&
+        last_masterchain_seqno_ > 0 && desc->generated_at() < last_masterchain_block_handle_->unix_time() + 60) {
+        delay_action(
           [SelfId = actor_id(this), desc]() {
             auto P = td::PromiseCreator::lambda([](td::Result<td::Ref<ShardState>> R) {
               if (R.is_error()) {
@@ -2367,8 +2367,8 @@ void ValidatorManagerImpl::get_shard_client_state(bool from_db, td::Promise<Bloc
   }
 }
 
-void ValidatorManagerImpl::subscribe_to_shard(ShardIdFull shard) {
-  callback_->subscribe_to_shard(shard);
+void ValidatorManagerImpl::update_shard_configuration(td::Ref<MasterchainState> state) {
+  callback_->update_shard_configuration(state);
 }
 
 void ValidatorManagerImpl::update_async_serializer_state(AsyncSerializerState state, td::Promise<td::Unit> promise) {
@@ -2397,6 +2397,7 @@ void ValidatorManagerImpl::get_archive_slice(td::uint64 archive_id, td::uint64 o
 }
 
 bool ValidatorManagerImpl::is_validator() {
+  // TODO: change is_vaidator to other condition in some cases
   return true; // temp_keys_.size() > 0 || permanent_keys_.size() > 0;
 }
 
@@ -2700,6 +2701,9 @@ void ValidatorManagerImpl::add_collator(adnl::AdnlNodeIdShort id, ShardIdFull sh
     it = collator_nodes_.emplace(id, std::move(actor)).first;
   }
   td::actor::send_closure(it->second, &CollatorNode::add_shard, shard);
+  if (shard.is_masterchain()) {
+    collating_masterchain_ = true;
+  }
 }
 
 td::actor::ActorOwn<ValidatorManagerInterface> ValidatorManagerFactory::create(
diff --git a/validator/manager.hpp b/validator/manager.hpp
index 94657d49..1105b2b6 100644
--- a/validator/manager.hpp
+++ b/validator/manager.hpp
@@ -447,7 +447,7 @@ class ValidatorManagerImpl : public ValidatorManager {
 
   void update_shard_client_state(BlockIdExt masterchain_block_id, td::Promise<td::Unit> promise) override;
   void get_shard_client_state(bool from_db, td::Promise<BlockIdExt> promise) override;
-  void subscribe_to_shard(ShardIdFull shard) override;
+  void update_shard_configuration(td::Ref<MasterchainState> state) override;
 
   void update_async_serializer_state(AsyncSerializerState state, td::Promise<td::Unit> promise) override;
   void get_async_serializer_state(td::Promise<AsyncSerializerState> promise) override;
@@ -611,6 +611,7 @@ class ValidatorManagerImpl : public ValidatorManager {
   void cleanup_old_pending_candidates(BlockId block_id, td::Timestamp now);
 
   std::map<adnl::AdnlNodeIdShort, td::actor::ActorOwn<CollatorNode>> collator_nodes_;
+  bool collating_masterchain_ = false;
 };
 
 }  // namespace validator
diff --git a/validator/net/download-block-new.cpp b/validator/net/download-block-new.cpp
index ef5ed7e5..1063d8a3 100644
--- a/validator/net/download-block-new.cpp
+++ b/validator/net/download-block-new.cpp
@@ -201,10 +201,10 @@ void DownloadBlockNew::got_node_to_download(adnl::AdnlNodeIdShort node) {
   }
   if (client_.empty()) {
     td::actor::send_closure(overlays_, &overlay::Overlays::send_query_via, download_from_, local_id_, overlay_id_,
-                            "get_proof", std::move(P), td::Timestamp::in(3.0), std::move(q),
+                            "get_block_full", std::move(P), td::Timestamp::in(3.0), std::move(q),
                             FullNode::max_proof_size() + FullNode::max_block_size() + 128, rldp_);
   } else {
-    td::actor::send_closure(client_, &adnl::AdnlExtClient::send_query, "get_prepare",
+    td::actor::send_closure(client_, &adnl::AdnlExtClient::send_query, "get_block_full",
                             create_serialize_tl_object_suffix<ton_api::tonNode_query>(std::move(q)),
                             td::Timestamp::in(1.0), std::move(P));
   }
diff --git a/validator/shard-client.cpp b/validator/shard-client.cpp
index af44f16e..50c6075d 100644
--- a/validator/shard-client.cpp
+++ b/validator/shard-client.cpp
@@ -247,39 +247,7 @@ void ShardClient::get_processed_masterchain_block_id(td::Promise<BlockIdExt> pro
 }
 
 void ShardClient::build_shard_overlays() {
-  auto v = masterchain_state_->get_shards();
-  std::set<WorkchainId> workchains;
-
-  for (auto &x : v) {
-    auto shard = x->shard();
-    workchains.insert(shard.workchain);
-    if (opts_->need_monitor(shard)) {
-      auto d = masterchain_state_->soft_min_split_depth(shard.workchain);
-      auto l = shard_prefix_length(shard.shard);
-      if (l > d) {
-        shard = shard_prefix(shard, d);
-      }
-
-      if (created_overlays_.count(shard) == 0) {
-        created_overlays_.insert(shard);
-        td::actor::send_closure(manager_, &ValidatorManager::subscribe_to_shard, shard);
-      }
-    }
-  }
-
-  for (const auto &wpair : masterchain_state_->get_workchain_list()) {
-    ton::WorkchainId wc = wpair.first;
-    const block::WorkchainInfo *winfo = wpair.second.get();
-    if (workchains.count(wc) == 0 && winfo->active && winfo->enabled_since <= masterchain_state_->get_unix_time()) {
-      auto shard = ShardIdFull(wc);
-      if (opts_->need_monitor(shard) && created_overlays_.count(shard) == 0) {
-        td::actor::send_closure(manager_, &ValidatorManager::subscribe_to_shard, shard);
-        BlockIdExt block_id(shard.workchain, shard.shard, 0, winfo->zerostate_root_hash, winfo->zerostate_file_hash);
-        td::actor::send_closure_later(manager_, &ValidatorManager::wait_block_state_short, block_id, 0,
-                                      td::Timestamp::in(5.0), [](td::Result<td::Ref<ShardState>>) {});
-      }
-    }
-  }
+  td::actor::send_closure(manager_, &ValidatorManager::update_shard_configuration, masterchain_state_);
 }
 
 void ShardClient::force_update_shard_client(BlockHandle handle, td::Promise<td::Unit> promise) {
diff --git a/validator/validator-group.cpp b/validator/validator-group.cpp
index bb493f91..8eae6133 100644
--- a/validator/validator-group.cpp
+++ b/validator/validator-group.cpp
@@ -105,8 +105,7 @@ void ValidatorGroup::validate_block_candidate(td::uint32 round_id, BlockCandidat
 
 void ValidatorGroup::update_approve_cache(td::uint32 round_id, CacheKey key, UnixTime value) {
   if (approved_candidates_cache_round_ != round_id) {
-    approved_candidates_cache_round_ = round_id;
-    approved_candidates_cache_.clear();
+    return;
   }
   approved_candidates_cache_[key] = value;
 }
@@ -157,15 +156,9 @@ void ValidatorGroup::accept_block_query(BlockIdExt block_id, td::Ref<BlockData>
     }
   });
 
-  if (shard_.is_masterchain() || lite_mode_) {
-    run_accept_block_query(block_id, std::move(block), std::move(prev), validator_set_, std::move(sig_set),
-                           std::move(approve_sig_set), send_broadcast, manager_, std::move(P));
-  } else if (send_broadcast) {
-    run_broadcast_only_accept_block_query(block_id, std::move(block), std::move(prev), validator_set_,
-                                          std::move(sig_set), std::move(approve_sig_set), manager_, std::move(P));
-  } else {
-    promise.set_value(td::Unit());
-  }
+  run_accept_block_query(block_id, std::move(block), std::move(prev), validator_set_, std::move(sig_set),
+                         std::move(approve_sig_set), send_broadcast, shard_.is_masterchain() || !lite_mode_, manager_,
+                         std::move(P));
 }
 
 void ValidatorGroup::skip_round(td::uint32 round_id) {
@@ -386,7 +379,7 @@ void ValidatorGroup::send_collate_query(td::uint32 round_id, td::Timestamp timeo
         td::actor::send_closure(SelfId, &ValidatorGroup::receive_collate_query_response, round_id, R.move_as_ok(),
                                 std::move(promise));
       });
-  LOG(INFO) << "collate query for " << shard_.to_str() << ": send query to " << collator;
+  LOG(INFO) << "collate query for " << create_next_block_id_simple().to_str() << ": send query to " << collator;
   size_t max_answer_size = config_.max_block_size + config_.max_collated_data_size + 256;
   td::actor::send_closure(rldp_, &rldp::Rldp::send_query_ex, adnl::AdnlNodeIdShort(local_id_), collator, "collatequery",
                           std::move(P), timeout, std::move(query), max_answer_size);
@@ -412,6 +405,7 @@ void ValidatorGroup::receive_collate_query_response(td::uint32 round_id, td::Buf
   auto key = PublicKey{b->source_};
   if (!key.is_ed25519()) {
     promise.set_error(td::Status::Error("collate query: block candidate source mismatch"));
+    return;
   }
   auto e_key = Ed25519_PublicKey{key.ed25519_value().raw()};
   if (e_key != Ed25519_PublicKey{local_id_full_.ed25519_value().raw()}) {
diff --git a/validator/validator.h b/validator/validator.h
index 66007910..ab013cb0 100644
--- a/validator/validator.h
+++ b/validator/validator.h
@@ -111,8 +111,7 @@ class ValidatorManagerInterface : public td::actor::Actor {
     virtual ~Callback() = default;
 
     virtual void initial_read_complete(BlockHandle top_masterchain_blocks) = 0;
-    virtual void subscribe_to_shard(ShardIdFull shard) = 0;
-    //virtual void del_shard(ShardIdFull shard) = 0;
+    virtual void update_shard_configuration(td::Ref<ton::validator::MasterchainState> state) = 0;
 
     virtual void send_ihr_message(AccountIdPrefixFull dst, td::BufferSlice data) = 0;
     virtual void send_ext_message(AccountIdPrefixFull dst, td::BufferSlice data) = 0;
@@ -208,6 +207,11 @@ class ValidatorManagerInterface : public td::actor::Actor {
   virtual void get_block_by_seqno_from_db(AccountIdPrefixFull account, BlockSeqno seqno,
                                           td::Promise<ConstBlockHandle> promise) = 0;
 
+  virtual void wait_block_state(BlockHandle handle, td::uint32 priority, td::Timestamp timeout,
+                                td::Promise<td::Ref<ShardState>> promise) = 0;
+  virtual void wait_block_state_short(BlockIdExt block_id, td::uint32 priority, td::Timestamp timeout,
+                                      td::Promise<td::Ref<ShardState>> promise) = 0;
+
   virtual void get_archive_id(BlockSeqno masterchain_seqno, td::Promise<td::uint64> promise) = 0;
   virtual void get_archive_slice(td::uint64 archive_id, td::uint64 offset, td::uint32 limit,
                                  td::Promise<td::BufferSlice> promise) = 0;