diff --git a/ethcore/src/client.rs b/ethcore/src/client.rs
index 9244c26fc..3a1a80141 100644
--- a/ethcore/src/client.rs
+++ b/ethcore/src/client.rs
@@ -114,6 +114,9 @@ pub trait BlockChainClient : Sync + Send {
 	/// Get block total difficulty.
 	fn block_total_difficulty(&self, id: BlockId) -> Option<U256>;
 
+	/// Get block hash.
+	fn block_hash(&self, id: BlockId) -> Option<H256>;
+
 	/// Get address code.
 	fn code(&self, address: &Address) -> Option<Bytes>;
 
@@ -416,6 +419,11 @@ impl BlockChainClient for Client {
 		Self::block_hash(&chain, id).and_then(|hash| chain.block_details(&hash)).map(|d| d.total_difficulty)
 	}
 
+	fn block_hash(&self, id: BlockId) -> Option<H256> {
+		let chain = self.chain.read().unwrap();
+		Self::block_hash(&chain, id)
+	}
+
 	fn code(&self, address: &Address) -> Option<Bytes> {
 		self.state().code(address)
 	}
diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index 153a51216..e2cc1a5c3 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -267,11 +267,18 @@ impl EthFilter for EthFilterClient {
 					None => Ok(Value::Array(vec![] as Vec<Value>)),
 					Some(info) => match info.filter {
 						PollFilter::Block => {
-							//unimplemented!()
-							to_value(&self.client.chain_info().best_block_hash).map(|v| Value::Array(vec![v]))
+							let current_number = self.client.chain_info().best_block_number;
+							let hashes = (info.block_number..current_number).into_iter()
+								.map(BlockId::Number)
+								.filter_map(|id| self.client.block_hash(id))
+								.collect::<Vec<H256>>();
+
+							self.polls.lock().unwrap().update_poll(&index.value(), current_number);
+
+							to_value(&hashes)
 						},
 						PollFilter::PendingTransaction => {
-							//unimplemented!()
+							// TODO: fix implementation
 							to_value(&self.client.chain_info().best_block_hash).map(|v| Value::Array(vec![v]))
 						},
 						PollFilter::Logs(mut filter) => {
@@ -291,4 +298,12 @@ impl EthFilter for EthFilterClient {
 				}
 			})
 	}
+
+	fn uninstall_filter(&self, params: Params) -> Result<Value, Error> {
+		from_params::<(Index,)>(params)
+			.and_then(|(index,)| {
+				self.polls.lock().unwrap().remove_poll(&index.value());
+				to_value(&true)
+			})
+	}
 }
diff --git a/sync/src/tests/helpers.rs b/sync/src/tests/helpers.rs
index 7f2928ccd..1d442f908 100644
--- a/sync/src/tests/helpers.rs
+++ b/sync/src/tests/helpers.rs
@@ -105,6 +105,10 @@ impl BlockChainClient for TestBlockChainClient {
 		Some(U256::zero())
 	}
 
+	fn block_hash(&self, id: BlockId) -> Option<H256> {
+		unimplemented!();
+	}
+
 	fn code(&self, _address: &Address) -> Option<Bytes> {
 		unimplemented!();
 	}