diff --git a/crypto/block/block.tlb b/crypto/block/block.tlb
index 8cb6c2f0..f1a1c948 100644
--- a/crypto/block/block.tlb
+++ b/crypto/block/block.tlb
@@ -735,7 +735,8 @@ misbehaviour_punishment_config_v1#01
 _ MisbehaviourPunishmentConfig = ConfigParam 40;
 
 // collator_nodes: each collator is (workchain:int32 shard:uint64 adnl_id:uint256)
-colator_config#a0 full_collated_data:Bool collator_nodes:(HashmapE 352 Unit) = CollatorConfig;
+collator_info#0 full_node_id:(Maybe uint256) = CollatorInfo;
+colator_config#a0 full_collated_data:Bool collator_nodes:(HashmapE 352 CollatorInfo) = CollatorConfig;
 _ CollatorConfig = ConfigParam 41;
 
 oracle_bridge_params#_ bridge_address:bits256 oracle_mutlisig_address:bits256 oracles:(HashmapE 256 uint256) external_chain_address:bits256 = OracleBridgeParams;
diff --git a/crypto/block/mc-config.cpp b/crypto/block/mc-config.cpp
index a1ddfb3e..ed79c8b6 100644
--- a/crypto/block/mc-config.cpp
+++ b/crypto/block/mc-config.cpp
@@ -2142,14 +2142,19 @@ CollatorConfig Config::get_collator_config(bool need_collator_nodes) const {
   collator_config.full_collated_data = rec.full_collated_data;
   if (need_collator_nodes) {
     vm::Dictionary dict{rec.collator_nodes->prefetch_ref(), 32 + 64 + 256};
-    dict.check_for_each([&](Ref<vm::CellSlice>, td::ConstBitPtr key, int n) {
+    dict.check_for_each([&](Ref<vm::CellSlice> value, td::ConstBitPtr key, int n) {
       CHECK(n == 32 + 64 + 256);
       auto workchain = (td::int32)key.get_int(32);
       key.advance(32);
       td::uint64 shard = key.get_uint(64);
       key.advance(64);
       td::Bits256 adnl_id(key);
-      collator_config.collator_nodes.push_back({ton::ShardIdFull(workchain, shard), adnl_id});
+      td::Bits256 full_node_id = td::Bits256::zero();
+      gen::CollatorInfo::Record info;
+      if (tlb::csr_unpack(std::move(value), info) && info.full_node_id->size() == 257) {
+        full_node_id = td::Bits256(info.full_node_id->data_bits() + 1);
+      }
+      collator_config.collator_nodes.push_back({ton::ShardIdFull(workchain, shard), adnl_id, full_node_id});
       return true;
     });
   }
diff --git a/crypto/block/mc-config.h b/crypto/block/mc-config.h
index 7058117b..e00a045e 100644
--- a/crypto/block/mc-config.h
+++ b/crypto/block/mc-config.h
@@ -485,6 +485,7 @@ class ShardConfig {
 struct CollatorNodeDescr {
   ton::ShardIdFull shard;
   ton::NodeIdShort adnl_id;
+  ton::NodeIdShort full_node_id;
 };
 
 struct CollatorConfig {
diff --git a/overlay/overlay-broadcast.cpp b/overlay/overlay-broadcast.cpp
index ecd21e7a..bcb7c285 100644
--- a/overlay/overlay-broadcast.cpp
+++ b/overlay/overlay-broadcast.cpp
@@ -69,6 +69,10 @@ td::Status BroadcastSimple::run_checks() {
 td::Status BroadcastSimple::distribute() {
   auto B = serialize();
   auto nodes = overlay_->get_neighbours(5);
+  if (is_ours_) {
+    auto priority_nodes = overlay_->get_priority_broadcast_receivers(3);
+    nodes.insert(nodes.end(), priority_nodes.begin(), priority_nodes.end());
+  }
 
   auto manager = overlay_->overlay_manager();
   for (auto &n : nodes) {
@@ -140,7 +144,7 @@ td::Status BroadcastSimple::create_new(td::actor::ActorId<OverlayImpl> overlay,
   auto date = static_cast<td::uint32>(td::Clocks::system());
 
   auto B = std::make_unique<BroadcastSimple>(broadcast_hash, PublicKey{}, nullptr, flags, std::move(data), date,
-                                             td::BufferSlice{}, false, nullptr, adnl::AdnlNodeIdShort::zero());
+                                             td::BufferSlice{}, false, nullptr, adnl::AdnlNodeIdShort::zero(), true);
 
   auto to_sign = B->to_sign();
   auto P = td::PromiseCreator::lambda(
diff --git a/overlay/overlay-broadcast.hpp b/overlay/overlay-broadcast.hpp
index e7b39eec..906a94a0 100644
--- a/overlay/overlay-broadcast.hpp
+++ b/overlay/overlay-broadcast.hpp
@@ -46,6 +46,7 @@ class BroadcastSimple : public td::ListNode {
   td::uint32 date_;
   td::BufferSlice signature_;
   bool is_valid_{false};
+  bool is_ours_{false};
 
   OverlayImpl *overlay_;
 
@@ -63,7 +64,7 @@ class BroadcastSimple : public td::ListNode {
  public:
   BroadcastSimple(Overlay::BroadcastHash broadcast_hash, PublicKey source, std::shared_ptr<Certificate> cert,
                   td::uint32 flags, td::BufferSlice data, td::uint32 date, td::BufferSlice signature, bool is_valid,
-                  OverlayImpl *overlay, adnl::AdnlNodeIdShort src_peer_id)
+                  OverlayImpl *overlay, adnl::AdnlNodeIdShort src_peer_id, bool is_ours = false)
       : broadcast_hash_(broadcast_hash)
       , source_(std::move(source))
       , cert_(std::move(cert))
@@ -73,7 +74,8 @@ class BroadcastSimple : public td::ListNode {
       , signature_(std::move(signature))
       , is_valid_(is_valid)
       , overlay_(overlay)
-      , src_peer_id_(src_peer_id) {
+      , src_peer_id_(src_peer_id)
+      , is_ours_(is_ours) {
   }
 
   Overlay::BroadcastHash get_hash() const {
diff --git a/overlay/overlay-fec-broadcast.cpp b/overlay/overlay-fec-broadcast.cpp
index 7ff08309..4297ea0c 100644
--- a/overlay/overlay-fec-broadcast.cpp
+++ b/overlay/overlay-fec-broadcast.cpp
@@ -26,8 +26,8 @@ namespace overlay {
 
 td::Result<std::unique_ptr<BroadcastFec>> BroadcastFec::create(Overlay::BroadcastHash hash, PublicKey src,
                                                                Overlay::BroadcastDataHash data_hash, td::uint32 flags,
-                                                               td::uint32 date, fec::FecType fec_type) {
-  auto F = std::make_unique<BroadcastFec>(hash, std::move(src), data_hash, flags, date, std::move(fec_type));
+                                                               td::uint32 date, fec::FecType fec_type, bool is_ours) {
+  auto F = std::make_unique<BroadcastFec>(hash, std::move(src), data_hash, flags, date, std::move(fec_type), is_ours);
   TRY_STATUS(F->init_fec_type());
   TRY_STATUS(F->run_checks());
   return std::move(F);
@@ -94,12 +94,12 @@ void BroadcastFec::broadcast_checked(td::Result<td::Unit> R) {
   overlay_->deliver_broadcast(get_source().compute_short_id(), data_.clone());
   auto manager = overlay_->overlay_manager();
   while (!parts_.empty()) {
-       distribute_part(parts_.begin()->first);
+    distribute_part(parts_.begin()->first);
   }
 }
 
 // Do we need status here??
-td::Status  BroadcastFec::distribute_part(td::uint32 seqno) {
+td::Status BroadcastFec::distribute_part(td::uint32 seqno) {
   auto i = parts_.find(seqno);
   if (i == parts_.end()) {
     // should not get here
@@ -111,8 +111,12 @@ td::Status  BroadcastFec::distribute_part(td::uint32 seqno) {
   td::BufferSlice data = std::move(tls.second);
 
   auto nodes = overlay_->get_neighbours(5);
-  auto manager = overlay_->overlay_manager();
+  if (is_ours_) {
+    auto priority_nodes = overlay_->get_priority_broadcast_receivers(3);
+    nodes.insert(nodes.end(), priority_nodes.begin(), priority_nodes.end());
+  }
 
+  auto manager = overlay_->overlay_manager();
   for (auto &n : nodes) {
     if (neighbour_completed(n)) {
       continue;
@@ -140,7 +144,8 @@ td::Status OverlayFecBroadcastPart::apply() {
     if (is_short_) {
       return td::Status::Error(ErrorCode::protoviolation, "short broadcast part for incomplete broadcast");
     }
-    TRY_RESULT(B, BroadcastFec::create(broadcast_hash_, source_, broadcast_data_hash_, flags_, date_, fec_type_));
+    TRY_RESULT(
+        B, BroadcastFec::create(broadcast_hash_, source_, broadcast_data_hash_, flags_, date_, fec_type_, is_ours_));
     bcast_ = B.get();
     overlay_->register_fec_broadcast(std::move(B));
   }
@@ -304,7 +309,8 @@ td::Status OverlayFecBroadcastPart::create_new(OverlayImpl *overlay, td::actor::
 
   auto B = std::make_unique<OverlayFecBroadcastPart>(
       broadcast_hash, part_hash, PublicKey{}, overlay->get_certificate(local_id), data_hash, size, flags,
-      part_data_hash, std::move(part), seqno, std::move(fec_type), date, td::BufferSlice{}, false, nullptr, overlay, adnl::AdnlNodeIdShort::zero());
+      part_data_hash, std::move(part), seqno, std::move(fec_type), date, td::BufferSlice{}, false, nullptr, overlay,
+      adnl::AdnlNodeIdShort::zero(), true);
   auto to_sign = B->to_sign();
 
   auto P = td::PromiseCreator::lambda(
diff --git a/overlay/overlay-fec-broadcast.hpp b/overlay/overlay-fec-broadcast.hpp
index 612af22f..7f038b41 100644
--- a/overlay/overlay-fec-broadcast.hpp
+++ b/overlay/overlay-fec-broadcast.hpp
@@ -131,18 +131,19 @@ class BroadcastFec : public td::ListNode {
   td::Status run_checks();
 
   BroadcastFec(Overlay::BroadcastHash hash, PublicKey src, Overlay::BroadcastDataHash data_hash, td::uint32 flags,
-               td::uint32 date, fec::FecType fec_type)
+               td::uint32 date, fec::FecType fec_type, bool is_ours = false)
       : hash_(hash)
       , data_hash_(data_hash)
       , flags_(flags)
       , date_(date)
       , src_(std::move(src))
-      , fec_type_(std::move(fec_type)) {
+      , fec_type_(std::move(fec_type))
+      , is_ours_(is_ours) {
   }
 
   static td::Result<std::unique_ptr<BroadcastFec>> create(Overlay::BroadcastHash hash, PublicKey src,
                                                           Overlay::BroadcastDataHash data_hash, td::uint32 flags,
-                                                          td::uint32 date, fec::FecType fec_type);
+                                                          td::uint32 date, fec::FecType fec_type, bool is_ours);
 
   bool neighbour_received(adnl::AdnlNodeIdShort id) const {
     return received_neighbours_.find(id) != received_neighbours_.end();
@@ -225,6 +226,7 @@ class BroadcastFec : public td::ListNode {
   OverlayImpl *overlay_;
   adnl::AdnlNodeIdShort src_peer_id_ = adnl::AdnlNodeIdShort::zero();
   td::BufferSlice data_;
+  bool is_ours_ = false;
 };
 
 class OverlayFecBroadcastPart : public td::ListNode {
@@ -246,6 +248,7 @@ class OverlayFecBroadcastPart : public td::ListNode {
 
   bool is_short_;
   bool untrusted_{false};
+  bool is_ours_;
 
   BroadcastFec *bcast_;
   OverlayImpl *overlay_;
@@ -265,7 +268,8 @@ class OverlayFecBroadcastPart : public td::ListNode {
                           std::shared_ptr<Certificate> cert, Overlay::BroadcastDataHash data_hash, td::uint32 data_size,
                           td::uint32 flags, Overlay::BroadcastDataHash part_data_hash, td::BufferSlice data,
                           td::uint32 seqno, fec::FecType fec_type, td::uint32 date, td::BufferSlice signature,
-                          bool is_short, BroadcastFec *bcast, OverlayImpl *overlay, adnl::AdnlNodeIdShort src_peer_id)
+                          bool is_short, BroadcastFec *bcast, OverlayImpl *overlay, adnl::AdnlNodeIdShort src_peer_id,
+                          bool is_ours = false)
       : broadcast_hash_(broadcast_hash)
       , part_hash_(part_hash)
       , source_(std::move(source))
@@ -282,7 +286,8 @@ class OverlayFecBroadcastPart : public td::ListNode {
       , is_short_(is_short)
       , bcast_(bcast)
       , overlay_(overlay) 
-      , src_peer_id_(src_peer_id) {
+      , src_peer_id_(src_peer_id)
+      , is_ours_(is_ours) {
   }
 
   td::uint32 data_size() const {
diff --git a/overlay/overlay-manager.cpp b/overlay/overlay-manager.cpp
index 2134bbc0..96e9fc2a 100644
--- a/overlay/overlay-manager.cpp
+++ b/overlay/overlay-manager.cpp
@@ -359,6 +359,19 @@ void OverlayManager::get_stats(td::Promise<tl_object_ptr<ton_api::engine_validat
   td::actor::send_closure(act, &Cb::decr_pending);
 }
 
+void OverlayManager::set_priority_broadcast_receivers(adnl::AdnlNodeIdShort local_id, OverlayIdShort overlay,
+                                                      std::vector<adnl::AdnlNodeIdShort> nodes) {
+  auto it = overlays_.find(local_id);
+  if (it == overlays_.end()) {
+    return;
+  }
+  auto it2 = it->second.find(overlay);
+  if (it2 == it->second.end()) {
+    return;
+  }
+  td::actor::send_closure(it2->second, &Overlay::set_priority_broadcast_receivers, std::move(nodes));
+}
+
 Certificate::Certificate(PublicKey issued_by, td::int32 expire_at, td::uint32 max_size, td::uint32 flags,
                          td::BufferSlice signature)
     : issued_by_(issued_by)
diff --git a/overlay/overlay-manager.h b/overlay/overlay-manager.h
index ada37303..ed9da23b 100644
--- a/overlay/overlay-manager.h
+++ b/overlay/overlay-manager.h
@@ -96,6 +96,9 @@ class OverlayManager : public Overlays {
                         td::actor::ActorOwn<Overlay> overlay);
   void get_stats(td::Promise<tl_object_ptr<ton_api::engine_validator_overlaysStats>> promise) override;
 
+  void set_priority_broadcast_receivers(adnl::AdnlNodeIdShort local_id, OverlayIdShort overlay,
+                                        std::vector<adnl::AdnlNodeIdShort> nodes) override;
+
   struct PrintId {};
 
   PrintId print_id() const {
diff --git a/overlay/overlay.h b/overlay/overlay.h
index 146be738..fcf61ea8 100644
--- a/overlay/overlay.h
+++ b/overlay/overlay.h
@@ -69,6 +69,7 @@ class Overlay : public td::actor::Actor {
   virtual void update_peer_ip_str(adnl::AdnlNodeIdShort peer_id, td::string ip_str) = 0;
   //virtual void receive_broadcast(td::BufferSlice data) = 0;
   //virtual void subscribe(std::unique_ptr<Overlays::Callback> callback) = 0;
+  virtual void set_priority_broadcast_receivers(std::vector<adnl::AdnlNodeIdShort> nodes) = 0;
 };
 
 }  // namespace overlay
diff --git a/overlay/overlay.hpp b/overlay/overlay.hpp
index 19786494..07003e09 100644
--- a/overlay/overlay.hpp
+++ b/overlay/overlay.hpp
@@ -192,7 +192,19 @@ class OverlayImpl : public Overlay {
     } else {
       std::vector<adnl::AdnlNodeIdShort> vec;
       for (td::uint32 i = 0; i < max_size; i++) {
-        vec.push_back(neighbours_[td::Random::fast(0, static_cast<td::int32>(neighbours_.size()))]);
+        vec.push_back(neighbours_[td::Random::fast(0, static_cast<td::int32>(neighbours_.size()) - 1)]);
+      }
+      return vec;
+    }
+  }
+  std::vector<adnl::AdnlNodeIdShort> get_priority_broadcast_receivers(td::uint32 max_size = 0) const {
+    if (max_size == 0 || max_size >= priority_broadcast_receivers_.size()) {
+      return priority_broadcast_receivers_;
+    } else {
+      std::vector<adnl::AdnlNodeIdShort> vec;
+      for (td::uint32 i = 0; i < max_size; i++) {
+        vec.push_back(priority_broadcast_receivers_[td::Random::fast(
+            0, static_cast<td::int32>(priority_broadcast_receivers_.size()) - 1)]);
       }
       return vec;
     }
@@ -250,6 +262,10 @@ class OverlayImpl : public Overlay {
     }
   }
 
+  void set_priority_broadcast_receivers(std::vector<adnl::AdnlNodeIdShort> nodes) override {
+    priority_broadcast_receivers_ = std::move(nodes);
+  }
+
  private:
   template <class T>
   void process_query(adnl::AdnlNodeIdShort src, T &query, td::Promise<td::BufferSlice> promise) {
@@ -309,6 +325,7 @@ class OverlayImpl : public Overlay {
   std::queue<BroadcastHash> bcast_lru_;
 
   std::map<BroadcastHash, td::actor::ActorOwn<OverlayOutboundFecBroadcast>> out_fec_bcasts_;
+  std::vector<adnl::AdnlNodeIdShort> priority_broadcast_receivers_;
 
   void bcast_gc();
 
diff --git a/overlay/overlays.h b/overlay/overlays.h
index 0a9c7765..a7b29faf 100644
--- a/overlay/overlays.h
+++ b/overlay/overlays.h
@@ -238,6 +238,9 @@ class Overlays : public td::actor::Actor {
   virtual void get_overlay_random_peers(adnl::AdnlNodeIdShort local_id, OverlayIdShort overlay, td::uint32 max_peers,
                                         td::Promise<std::vector<adnl::AdnlNodeIdShort>> promise) = 0;
   virtual void get_stats(td::Promise<tl_object_ptr<ton_api::engine_validator_overlaysStats>> promise) = 0;
+
+  virtual void set_priority_broadcast_receivers(adnl::AdnlNodeIdShort local_id, OverlayIdShort overlay,
+                                                std::vector<adnl::AdnlNodeIdShort> nodes) = 0;
 };
 
 }  // namespace overlay
diff --git a/validator/full-node-shard.cpp b/validator/full-node-shard.cpp
index 56e0c1db..e491061e 100644
--- a/validator/full-node-shard.cpp
+++ b/validator/full-node-shard.cpp
@@ -127,6 +127,10 @@ void FullNodeShardImpl::create_overlay() {
   if (cert_) {
     td::actor::send_closure(overlays_, &overlay::Overlays::update_certificate, adnl_id_, overlay_id_, local_id_, cert_);
   }
+  if (!collator_nodes_.empty()) {
+    td::actor::send_closure(overlays_, &overlay::Overlays::set_priority_broadcast_receivers, adnl_id_, overlay_id_,
+                            collator_nodes_);
+  }
 }
 
 void FullNodeShardImpl::check_broadcast(PublicKeyHash src, td::BufferSlice broadcast, td::Promise<td::Unit> promise) {
@@ -1031,6 +1035,15 @@ void FullNodeShardImpl::update_validators(std::vector<PublicKeyHash> public_key_
   }
 }
 
+void FullNodeShardImpl::update_collators(std::vector<adnl::AdnlNodeIdShort> nodes) {
+  if (!client_.empty()) {
+    return;
+  }
+  collator_nodes_ = std::move(nodes);
+  td::actor::send_closure(overlays_, &overlay::Overlays::set_priority_broadcast_receivers, adnl_id_, overlay_id_,
+                          collator_nodes_);
+}
+
 void FullNodeShardImpl::reload_neighbours() {
   auto P = td::PromiseCreator::lambda([SelfId = actor_id(this)](td::Result<std::vector<adnl::AdnlNodeIdShort>> R) {
     if (R.is_error()) {
diff --git a/validator/full-node-shard.h b/validator/full-node-shard.h
index e24873aa..847091c6 100644
--- a/validator/full-node-shard.h
+++ b/validator/full-node-shard.h
@@ -75,6 +75,7 @@ class FullNodeShard : public td::actor::Actor {
   virtual void set_handle(BlockHandle handle, td::Promise<td::Unit> promise) = 0;
 
   virtual void update_validators(std::vector<PublicKeyHash> public_key_hashes, PublicKeyHash local_hash) = 0;
+  virtual void update_collators(std::vector<adnl::AdnlNodeIdShort> nodes) = 0;
 
   static td::actor::ActorOwn<FullNodeShard> create(
       ShardIdFull shard, PublicKeyHash local_id, adnl::AdnlNodeIdShort adnl_id, FileHash zero_state_file_hash,
diff --git a/validator/full-node-shard.hpp b/validator/full-node-shard.hpp
index cd7c20a9..1cb2957d 100644
--- a/validator/full-node-shard.hpp
+++ b/validator/full-node-shard.hpp
@@ -181,6 +181,7 @@ class FullNodeShardImpl : public FullNodeShard {
   void alarm() override;
 
   void update_validators(std::vector<PublicKeyHash> public_key_hashes, PublicKeyHash local_hash) override;
+  void update_collators(std::vector<adnl::AdnlNodeIdShort> nodes) override;
 
   void sign_overlay_certificate(PublicKeyHash signed_key, td::uint32 expiry_at, td::uint32 max_size, td::Promise<td::BufferSlice> promise) override;
   void import_overlay_certificate(PublicKeyHash signed_key, std::shared_ptr<ton::overlay::Certificate> cert, td::Promise<td::Unit> promise) override;
@@ -258,6 +259,7 @@ class FullNodeShardImpl : public FullNodeShard {
   adnl::AdnlNodeIdShort last_pinged_neighbour_ = adnl::AdnlNodeIdShort::zero();
 
   FullNodeShardMode mode_;
+  std::vector<adnl::AdnlNodeIdShort> collator_nodes_;
 };
 
 }  // namespace fullnode
diff --git a/validator/full-node.cpp b/validator/full-node.cpp
index 6792f969..52d3cfb9 100644
--- a/validator/full-node.cpp
+++ b/validator/full-node.cpp
@@ -205,6 +205,33 @@ void FullNodeImpl::update_shard_configuration(td::Ref<MasterchainState> state, s
       ++it;
     }
   }
+
+  if (!collators_inited_ || state->is_key_state()) {
+    update_collators(state);
+  }
+}
+
+void FullNodeImpl::update_collators(td::Ref<MasterchainState> state) {
+  collators_inited_ = true;
+  collator_config_ = state->get_collator_config(true);
+  for (auto& s : shards_) {
+    update_shard_collators(s.first, s.second);
+  }
+}
+
+void FullNodeImpl::update_shard_collators(ShardIdFull shard, ShardInfo& info) {
+  if (info.actor.empty()) {
+    return;
+  }
+  std::vector<adnl::AdnlNodeIdShort> nodes;
+  for (const block::CollatorNodeDescr& desc : collator_config_.collator_nodes) {
+    if (!desc.full_node_id.is_zero() && shard_intersects(shard, desc.shard)) {
+      nodes.emplace_back(desc.full_node_id);
+    }
+  }
+  std::sort(nodes.begin(), nodes.end());
+  nodes.erase(std::unique(nodes.begin(), nodes.end()), nodes.end());
+  td::actor::send_closure(info.actor, &FullNodeShard::update_collators, std::move(nodes));
 }
 
 void FullNodeImpl::add_shard_actor(ShardIdFull shard, FullNodeShardMode mode) {
@@ -219,6 +246,9 @@ void FullNodeImpl::add_shard_actor(ShardIdFull shard, FullNodeShardMode mode) {
   if (all_validators_.size() > 0) {
     td::actor::send_closure(info.actor, &FullNodeShard::update_validators, all_validators_, sign_cert_by_);
   }
+  if (collators_inited_) {
+    update_shard_collators(shard, info);
+  }
 }
 
 void FullNodeImpl::sync_completed() {
diff --git a/validator/full-node.hpp b/validator/full-node.hpp
index fbe60d1b..8cc8994b 100644
--- a/validator/full-node.hpp
+++ b/validator/full-node.hpp
@@ -92,7 +92,16 @@ class FullNodeImpl : public FullNode {
                td::Promise<td::Unit> started_promise);
 
  private:
+  struct ShardInfo {
+    bool exists = false;
+    td::actor::ActorOwn<FullNodeShard> actor;
+    FullNodeShardMode mode = FullNodeShardMode::inactive;
+    td::Timestamp delete_at = td::Timestamp::never();
+  };
+
   void add_shard_actor(ShardIdFull shard, FullNodeShardMode mode);
+  void update_collators(td::Ref<MasterchainState> state);
+  void update_shard_collators(ShardIdFull shard, ShardInfo& info);
 
   PublicKeyHash local_id_;
   adnl::AdnlNodeIdShort adnl_id_;
@@ -100,13 +109,6 @@ class FullNodeImpl : public FullNode {
 
   td::actor::ActorId<FullNodeShard> get_shard(AccountIdPrefixFull dst);
   td::actor::ActorId<FullNodeShard> get_shard(ShardIdFull shard, bool exact = false);
-
-  struct ShardInfo {
-    bool exists = false;
-    td::actor::ActorOwn<FullNodeShard> actor;
-    FullNodeShardMode mode = FullNodeShardMode::inactive;
-    td::Timestamp delete_at = td::Timestamp::never();
-  };
   std::map<ShardIdFull, ShardInfo> shards_;
 
   td::actor::ActorId<keyring::Keyring> keyring_;
@@ -125,6 +127,8 @@ class FullNodeImpl : public FullNode {
   std::set<PublicKeyHash> local_keys_;
 
   td::Promise<td::Unit> started_promise_;
+  bool collators_inited_ = false;
+  block::CollatorConfig collator_config_;
 };
 
 }  // namespace fullnode
diff --git a/validator/impl/shard.cpp b/validator/impl/shard.cpp
index 019ecbeb..a09bd1df 100644
--- a/validator/impl/shard.cpp
+++ b/validator/impl/shard.cpp
@@ -556,5 +556,9 @@ BlockIdExt MasterchainStateQ::prev_key_block_id(BlockSeqno seqno) const {
   return block_id;
 }
 
+bool MasterchainStateQ::is_key_state() const {
+  return config_ ? config_->is_key_state() : false;
+}
+
 }  // namespace validator
 }  // namespace ton
diff --git a/validator/impl/shard.hpp b/validator/impl/shard.hpp
index 6b95c7e4..c726447f 100644
--- a/validator/impl/shard.hpp
+++ b/validator/impl/shard.hpp
@@ -129,6 +129,7 @@ class MasterchainStateQ : public MasterchainState, public ShardStateQ {
   BlockIdExt last_key_block_id() const override;
   BlockIdExt next_key_block_id(BlockSeqno seqno) const override;
   BlockIdExt prev_key_block_id(BlockSeqno seqno) const override;
+  bool is_key_state() const override;
   MasterchainStateQ* make_copy() const override;
 
   static td::Result<Ref<MasterchainStateQ>> fetch(const BlockIdExt& _id, td::BufferSlice _data,
diff --git a/validator/interfaces/shard.h b/validator/interfaces/shard.h
index 15caa7b2..59211a85 100644
--- a/validator/interfaces/shard.h
+++ b/validator/interfaces/shard.h
@@ -77,6 +77,7 @@ class MasterchainState : virtual public ShardState {
   virtual BlockIdExt last_key_block_id() const = 0;
   virtual BlockIdExt next_key_block_id(BlockSeqno seqno) const = 0;
   virtual BlockIdExt prev_key_block_id(BlockSeqno seqno) const = 0;
+  virtual bool is_key_state() const = 0;
   virtual bool get_old_mc_block_id(ton::BlockSeqno seqno, ton::BlockIdExt& blkid,
                                    ton::LogicalTime* end_lt = nullptr) const = 0;
   virtual bool check_old_mc_block_id(const ton::BlockIdExt& blkid, bool strict = false) const = 0;