diff --git a/sync/src/lib.rs b/sync/src/lib.rs
index 8dd68875..00338074 100644
--- a/sync/src/lib.rs
+++ b/sync/src/lib.rs
@@ -47,6 +47,7 @@ use std::sync::Arc;
 use parking_lot::RwLock;
 use tokio_core::reactor::Handle;
 use network::Magic;
+use verification::ChainVerifier;
 
 /// Sync errors.
 #[derive(Debug)]
@@ -81,11 +82,12 @@ pub fn create_sync_connection_factory(handle: &Handle, network: Magic, db: db::S
 		threads_num: 4,
 	};
 
-	let sync_chain = Arc::new(RwLock::new(SyncChain::new(db)));
+	let sync_chain = Arc::new(RwLock::new(SyncChain::new(db.clone())));
+	let chain_verifier = Arc::new(ChainVerifier::new(db, network));
 	let sync_executor = SyncExecutor::new(sync_chain.clone());
 	let sync_server = Arc::new(SynchronizationServer::new(sync_chain.clone(), sync_executor.clone()));
-	let sync_client_core = SynchronizationClientCore::new(sync_client_config, handle, sync_executor.clone(), sync_chain.clone(), network);
-	let verifier = AsyncVerifier::new(network, sync_chain, sync_client_core.clone());
+	let sync_client_core = SynchronizationClientCore::new(sync_client_config, handle, sync_executor.clone(), sync_chain.clone(), chain_verifier.clone());
+	let verifier = AsyncVerifier::new(chain_verifier, sync_chain, sync_client_core.clone());
 	let sync_client = SynchronizationClient::new(sync_client_core, verifier);
 	let sync_node = Arc::new(SyncNode::new(sync_server, sync_client, sync_executor));
 	SyncConnectionFactory::with_local_node(sync_node)
diff --git a/sync/src/synchronization_client.rs b/sync/src/synchronization_client.rs
index 6c3a1a35..b110b0fc 100644
--- a/sync/src/synchronization_client.rs
+++ b/sync/src/synchronization_client.rs
@@ -30,7 +30,6 @@ use compact_block_builder::build_compact_block;
 use hash_queue::HashPosition;
 use miner::transaction_fee_rate;
 use verification::ChainVerifier;
-use network::Magic;
 use time;
 use std::time::Duration;
 
@@ -298,8 +297,8 @@ pub struct SynchronizationClientCore<T: TaskExecutor> {
 	orphaned_blocks_pool: OrphanBlocksPool,
 	/// Orphaned transactions pool.
 	orphaned_transactions_pool: OrphanTransactionsPool,
-	/// Network config
-	network: Magic,
+	/// Chain verifier
+	chain_verifier: Arc<ChainVerifier>,
 	/// Verify block headers?
 	verify_headers: bool,
 	/// Verifying blocks by peer
@@ -655,7 +654,6 @@ impl<T> ClientCore for SynchronizationClientCore<T> where T: TaskExecutor {
 
 			// validate blocks headers before scheduling
 			let chain = self.chain.read();
-			let verifier = ChainVerifier::new(chain.storage(), self.network);
 			let mut block_header_provider = MessageBlockHeadersProvider::new(&*chain);
 			let mut blocks_hashes: Vec<H256> = Vec::with_capacity(blocks_headers.len());
 			let mut prev_block_hash = header0.previous_header_hash.clone();
@@ -669,7 +667,7 @@ impl<T> ClientCore for SynchronizationClientCore<T> where T: TaskExecutor {
 
 				// verify header
 				if self.verify_headers {
-					if let Err(error) = verifier.verify_block_header(&block_header_provider, &block_header_hash, &block_header) {
+					if let Err(error) = self.chain_verifier.verify_block_header(&block_header_provider, &block_header_hash, &block_header) {
 						warn!(target: "sync", "Error verifying header {:?} from peer#{} `headers` message: {:?}", block_header_hash.to_reversed_str(), peer_index, error);
 						return;
 					}
@@ -1088,7 +1086,7 @@ impl<T> VerificationSink for SynchronizationClientCore<T> where T: TaskExecutor
 
 impl<T> SynchronizationClientCore<T> where T: TaskExecutor {
 	/// Create new synchronization client core
-	pub fn new(config: Config, handle: &Handle, executor: Arc<Mutex<T>>, chain: ChainRef, network: Magic) -> Arc<Mutex<Self>> {
+	pub fn new(config: Config, handle: &Handle, executor: Arc<Mutex<T>>, chain: ChainRef, chain_verifier: Arc<ChainVerifier>) -> Arc<Mutex<Self>> {
 		let sync = Arc::new(Mutex::new(
 			SynchronizationClientCore {
 				state: State::Saturated,
@@ -1099,7 +1097,7 @@ impl<T> SynchronizationClientCore<T> where T: TaskExecutor {
 				chain: chain.clone(),
 				orphaned_blocks_pool: OrphanBlocksPool::new(),
 				orphaned_transactions_pool: OrphanTransactionsPool::new(),
-				network: network,
+				chain_verifier: chain_verifier,
 				verify_headers: true,
 				verifying_blocks_by_peer: HashMap::new(),
 				verifying_blocks_futures: HashMap::new(),
@@ -1683,7 +1681,6 @@ pub mod tests {
 	use synchronization_verifier::tests::DummyVerifier;
 	use synchronization_server::ServerTaskIndex;
 	use primitives::hash::H256;
-	use network::Magic;
 	use p2p::event_loop;
 	use test_data;
 	use db::{self, BlockHeaderProvider};
diff --git a/sync/src/synchronization_verifier.rs b/sync/src/synchronization_verifier.rs
index eccf71f1..c2b2ae95 100644
--- a/sync/src/synchronization_verifier.rs
+++ b/sync/src/synchronization_verifier.rs
@@ -60,9 +60,8 @@ struct EmptyTransactionOutputProvider {
 
 impl AsyncVerifier {
 	/// Create new async verifier
-	pub fn new<T: VerificationSink>(network: Magic, chain: ChainRef, sink: Arc<Mutex<T>>) -> Self {
+	pub fn new<T: VerificationSink>(verifier: Arc<ChainVerifier>, chain: ChainRef, sink: Arc<Mutex<T>>) -> Self {
 		let (verification_work_sender, verification_work_receiver) = channel();
-		let verifier = ChainVerifier::new(chain.read().storage(), network);
 		AsyncVerifier {
 			verification_work_sender: verification_work_sender,
 			verification_worker_thread: Some(thread::Builder::new()
@@ -75,7 +74,7 @@ impl AsyncVerifier {
 	}
 
 	/// Thread procedure for handling verification tasks
-	fn verification_worker_proc<T: VerificationSink>(sink: Arc<Mutex<T>>, chain: ChainRef, verifier: ChainVerifier, work_receiver: Receiver<VerificationTask>) {
+	fn verification_worker_proc<T: VerificationSink>(sink: Arc<Mutex<T>>, chain: ChainRef, verifier: Arc<ChainVerifier>, work_receiver: Receiver<VerificationTask>) {
 		while let Ok(task) = work_receiver.recv() {
 			match task {
 				VerificationTask::Stop => break,