diff --git a/ethcore/src/client.rs b/ethcore/src/client.rs
index c3ec4b4d0..aa71fbbfa 100644
--- a/ethcore/src/client.rs
+++ b/ethcore/src/client.rs
@@ -22,7 +22,7 @@ use rocksdb::{Options, DB, DBCompactionStyle};
 use blockchain::{BlockChain, BlockProvider, CacheSize};
 use views::BlockView;
 use error::*;
-use header::BlockNumber;
+use header::{BlockNumber, Header};
 use state::State;
 use spec::Spec;
 use engine::Engine;
@@ -243,85 +243,117 @@ impl Client {
 		self.block_queue.write().unwrap().flush();
 	}
 
+	fn build_last_hashes(&self, header: &Header) -> LastHashes {
+		let mut last_hashes = LastHashes::new();
+		last_hashes.resize(256, H256::new());
+		last_hashes[0] = header.parent_hash.clone();
+		let chain = self.chain.read().unwrap();
+		for i in 0..255 {
+			match chain.block_details(&last_hashes[i]) {
+				Some(details) => {
+					last_hashes[i + 1] = details.parent.clone();
+				},
+				None => break,
+			}
+		}
+		last_hashes
+	}
+
 	/// This is triggered by a message coming from a block queue when the block is ready for insertion
 	pub fn import_verified_blocks(&self, io: &IoChannel<NetSyncMessage>) -> usize {
-		let mut ret = 0;
-		let mut bad = HashSet::new();
+		let max_blocks_to_import = 128;
+
+		let mut imported = 0;
+		let mut good_blocks = Vec::with_capacity(max_blocks_to_import);
+		let mut bad_blocks = HashSet::new();
+		let engine = self.engine.deref().deref();
+
 		let _import_lock = self.import_lock.lock();
-		let blocks = self.block_queue.write().unwrap().drain(128);
-		let mut good_blocks = Vec::with_capacity(128);
+		let blocks = self.block_queue.write().unwrap().drain(max_blocks_to_import);
+
 		for block in blocks {
-			if bad.contains(&block.header.parent_hash) {
-				self.block_queue.write().unwrap().mark_as_bad(&block.header.hash());
-				bad.insert(block.header.hash());
+			let header = &block.header;
+			let header_hash = block.header.hash();
+			let bad_contains_parent = bad_blocks.contains(&header.parent_hash);
+
+			let mark_block_as_bad = || {
+				self.block_queue.write().unwrap().mark_as_bad(&header_hash);
+				bad_blocks.insert(header_hash);
+			};
+
+			if bad_contains_parent {
+				mark_block_as_bad();
 				continue;
 			}
 
-			let header = &block.header;
-			if let Err(e) = verify_block_family(&header, &block.bytes, self.engine.deref().deref(), self.chain.read().unwrap().deref()) {
+			// Verify Block Family
+			let verify_family_result = verify_block_family(&header, &block.bytes, engine, self.chain.read().unwrap().deref());
+			if let Err(e) = verify_family_result {
 				warn!(target: "client", "Stage 3 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-				self.block_queue.write().unwrap().mark_as_bad(&header.hash());
-				bad.insert(block.header.hash());
+				mark_block_as_bad();
 				break;
 			};
-			let parent = match self.chain.read().unwrap().block_header(&header.parent_hash) {
-				Some(p) => p,
-				None => {
-					warn!(target: "client", "Block import failed for #{} ({}): Parent not found ({}) ", header.number(), header.hash(), header.parent_hash);
-					self.block_queue.write().unwrap().mark_as_bad(&header.hash());
-					bad.insert(block.header.hash());
-					break;
-				},
-			};
-			// build last hashes
-			let mut last_hashes = LastHashes::new();
-			last_hashes.resize(256, H256::new());
-			last_hashes[0] = header.parent_hash.clone();
-			for i in 0..255 {
-				match self.chain.read().unwrap().block_details(&last_hashes[i]) {
-					Some(details) => {
-						last_hashes[i + 1] = details.parent.clone();
-					},
-					None => break,
-				}
-			}
 
+			// Check if Parent is in chain
+			let chain_has_parent = self.chain.read().unwrap().block_header(&header.parent_hash);
+			if let None = chain_has_parent {
+				warn!(target: "client", "Block import failed for #{} ({}): Parent not found ({}) ", header.number(), header.hash(), header.parent_hash);
+				mark_block_as_bad();
+				break;
+			};
+
+			// Enact Verified Block
+			let parent = chain_has_parent.unwrap();
+			let last_hashes = self.build_last_hashes(header);
 			let db = self.state_db.lock().unwrap().clone();
-			let result = match enact_verified(&block, self.engine.deref().deref(), db, &parent, &last_hashes) {
-				Ok(b) => b,
-				Err(e) => {
-					warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-					bad.insert(block.header.hash());
-					self.block_queue.write().unwrap().mark_as_bad(&header.hash());
-					break;
-				}
+
+			let enact_result = enact_verified(&block, engine, db, &parent, &last_hashes);
+			if let Err(e) = enact_result {
+				warn!(target: "client", "Block import failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
+				mark_block_as_bad();
+				break;
 			};
-			if let Err(e) = verify_block_final(&header, result.block().header()) {
+
+			// Final Verification
+			let enact_result = enact_result.unwrap();
+			if let Err(e) = verify_block_final(&header, enact_result.block().header()) {
 				warn!(target: "client", "Stage 4 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
-				self.block_queue.write().unwrap().mark_as_bad(&header.hash());
+				mark_block_as_bad();
 				break;
 			}
 
-			good_blocks.push(header.hash().clone());
-
+			// Insert block
 			self.chain.write().unwrap().insert_block(&block.bytes); //TODO: err here?
-			let ancient = if header.number() >= HISTORY { Some(header.number() - HISTORY) } else { None };
-			match result.drain().commit(header.number(), &header.hash(), ancient.map(|n|(n, self.chain.read().unwrap().block_hash(n).unwrap()))) {
-				Ok(_) => (),
-				Err(e) => {
-					warn!(target: "client", "State DB commit failed: {:?}", e);
-					break;
-				}
+			good_blocks.push(header.hash());
+
+			let ancient = if header.number() >= HISTORY {
+				let n = header.number() - HISTORY;
+				let chain = self.chain.read().unwrap();
+				Some((n, chain.block_hash(n).unwrap()))
+			} else {
+				None
+			};
+
+			// Commit results
+			let commit_result = enact_result.drain().commit(header.number(), &header.hash(), ancient);
+			if let Err(e) = commit_result {
+				warn!(target: "client", "State DB commit failed: {:?}", e);
+				break;
 			}
+
 			self.report.write().unwrap().accrue_block(&block);
 			trace!(target: "client", "Imported #{} ({})", header.number(), header.hash());
-			ret += 1;
+			imported += 1;
 		}
+
 		self.block_queue.write().unwrap().mark_as_good(&good_blocks);
 		if !good_blocks.is_empty() && self.block_queue.read().unwrap().queue_info().is_empty() {
-			io.send(NetworkIoMessage::User(SyncMessage::BlockVerified)).unwrap();
+			io.send(NetworkIoMessage::User(SyncMessage::NewChainBlocks {
+				good: good_blocks,
+				bad: bad_blocks.into_iter().collect(),
+			})).unwrap();
 		}
-		ret
+		imported
 	}
 
 	/// Get a copy of the best block's state.
@@ -393,7 +425,7 @@ impl BlockChainClient for Client {
 			None => BlockStatus::Unknown
 		}
 	}
-	
+
 	fn block_total_difficulty(&self, id: BlockId) -> Option<U256> {
 		let chain = self.chain.read().unwrap();
 		Self::block_hash(&chain, id).and_then(|hash| chain.block_details(&hash)).map(|d| d.total_difficulty)
@@ -435,6 +467,7 @@ impl BlockChainClient for Client {
 			return Err(ImportError::UnknownParent);
 		}
 		self.block_queue.write().unwrap().import_block(bytes)
+		// TODO [ToDr] remove transactions
 	}
 
 	fn queue_info(&self) -> BlockQueueInfo {
diff --git a/ethcore/src/service.rs b/ethcore/src/service.rs
index 534aab49d..cdf3425e8 100644
--- a/ethcore/src/service.rs
+++ b/ethcore/src/service.rs
@@ -26,7 +26,12 @@ use client::Client;
 #[derive(Clone)]
 pub enum SyncMessage {
 	/// New block has been imported into the blockchain
-	NewChainBlock(Bytes), //TODO: use Cow
+	NewChainBlocks {
+		/// Hashes of blocks imported to blockchain
+		good: Vec<H256>,
+		/// Hashes of blocks not imported to blockchain
+		bad: Vec<H256>,
+	},
 	/// A block is ready
 	BlockVerified,
 }