diff --git a/ethcore/src/client.rs b/ethcore/src/client.rs
index 68507c131..c3f3ae1be 100644
--- a/ethcore/src/client.rs
+++ b/ethcore/src/client.rs
@@ -185,6 +185,13 @@ pub trait BlockChainClient : Sync + Send {
 
 	/// Returns logs matching given filter.
 	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry>;
+
+	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
+	fn sealing_block(&self) -> &Mutex<Option<ClosedBlock>>;
+
+	/// Submit `seal` as a valid solution for the header of `pow_hash`.
+	/// Will check the seal, but not actually insert the block into the chain.
+	fn submit_seal(&self, pow_hash: H256, seal: Vec<Bytes>) -> Result<(), Error>;
 }
 
 #[derive(Default, Clone, Debug, Eq, PartialEq)]
@@ -523,39 +530,6 @@ impl<V> Client<V> where V: Verifier {
 		trace!("Sealing: number={}, hash={}, diff={}", b.hash(), b.block().header().difficulty(), b.block().header().number());
 		*self.sealing_block.lock().unwrap() = Some(b);
 	}
-
-	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
-	pub fn sealing_block(&self) -> &Mutex<Option<ClosedBlock>> {
-		if self.sealing_block.lock().unwrap().is_none() {
-			self.sealing_enabled.store(true, atomic::Ordering::Relaxed);
-			// TODO: Above should be on a timer that resets after two blocks have arrived without being asked for.
-			self.prepare_sealing();
-		}
-		&self.sealing_block
-	}
-
-	/// Submit `seal` as a valid solution for the header of `pow_hash`.
-	/// Will check the seal, but not actually insert the block into the chain.
-	pub fn submit_seal(&self, pow_hash: H256, seal: Vec<Bytes>) -> Result<(), Error> {
-		let mut maybe_b = self.sealing_block.lock().unwrap();
-		match *maybe_b {
-			Some(ref b) if b.hash() == pow_hash => {}
-			_ => { return Err(Error::PowHashInvalid); }
-		}
-
-		let b = maybe_b.take();
-		match b.unwrap().try_seal(self.engine.deref().deref(), seal) {
-			Err(old) => {
-				*maybe_b = Some(old);
-				Err(Error::PowInvalid)
-			}
-			Ok(sealed) => {
-				// TODO: commit DB from `sealed.drain` and make a VerifiedBlock to skip running the transactions twice.
-				try!(self.import_block(sealed.rlp_bytes()));
-				Ok(())
-			}
-		}
-	}
 }
 
 // TODO: need MinerService MinerIoHandler
@@ -718,6 +692,39 @@ impl<V> BlockChainClient for Client<V> where V: Verifier {
 			})
 			.collect()
 	}
+
+	/// Grab the `ClosedBlock` that we want to be sealed. Comes as a mutex that you have to lock.
+	fn sealing_block(&self) -> &Mutex<Option<ClosedBlock>> {
+		if self.sealing_block.lock().unwrap().is_none() {
+			self.sealing_enabled.store(true, atomic::Ordering::Relaxed);
+			// TODO: Above should be on a timer that resets after two blocks have arrived without being asked for.
+			self.prepare_sealing();
+		}
+		&self.sealing_block
+	}
+
+	/// Submit `seal` as a valid solution for the header of `pow_hash`.
+	/// Will check the seal, but not actually insert the block into the chain.
+	fn submit_seal(&self, pow_hash: H256, seal: Vec<Bytes>) -> Result<(), Error> {
+		let mut maybe_b = self.sealing_block.lock().unwrap();
+		match *maybe_b {
+			Some(ref b) if b.hash() == pow_hash => {}
+			_ => { return Err(Error::PowHashInvalid); }
+		}
+
+		let b = maybe_b.take();
+		match b.unwrap().try_seal(self.engine.deref().deref(), seal) {
+			Err(old) => {
+				*maybe_b = Some(old);
+				Err(Error::PowInvalid)
+			}
+			Ok(sealed) => {
+				// TODO: commit DB from `sealed.drain` and make a VerifiedBlock to skip running the transactions twice.
+				try!(self.import_block(sealed.rlp_bytes()));
+				Ok(())
+			}
+		}
+	}
 }
 
 impl MayPanic for Client {
diff --git a/parity/main.rs b/parity/main.rs
index 68d45bc04..8814da44b 100644
--- a/parity/main.rs
+++ b/parity/main.rs
@@ -49,7 +49,7 @@ use ethcore::spec::*;
 use ethcore::client::*;
 use ethcore::service::{ClientService, NetSyncMessage};
 use ethcore::ethereum;
-use ethsync::{EthSync, SyncConfig};
+use ethsync::{EthSync, SyncConfig, SyncStatusProvider};
 use docopt::Docopt;
 use daemonize::Daemonize;
 use number_prefix::{binary_prefix, Standalone, Prefixed};
diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index 479bae95b..91bd0cce3 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -17,7 +17,7 @@
 //! Eth rpc implementation.
 use std::collections::HashMap;
 use std::sync::{Arc, Weak, Mutex, RwLock};
-use ethsync::{EthSync, SyncState};
+use ethsync::{SyncStatusProvider, SyncState};
 use jsonrpc_core::*;
 use util::numbers::*;
 use util::sha3::*;
@@ -25,7 +25,6 @@ use util::rlp::encode;
 use ethcore::client::*;
 use ethcore::block::{IsBlock};
 use ethcore::views::*;
-//#[macro_use] extern crate log;
 use ethcore::ethereum::Ethash;
 use ethcore::ethereum::denominations::shannon;
 use v1::traits::{Eth, EthFilter};
@@ -33,15 +32,15 @@ use v1::types::{Block, BlockTransactions, BlockNumber, Bytes, SyncStatus, SyncIn
 use v1::helpers::{PollFilter, PollManager};
 
 /// Eth rpc implementation.
-pub struct EthClient {
-	client: Weak<Client>,
-	sync: Weak<EthSync>,
+pub struct EthClient<C, S> where C: BlockChainClient, S: SyncStatusProvider {
+	client: Weak<C>,
+	sync: Weak<S>,
 	hashrates: RwLock<HashMap<H256, u64>>,
 }
 
-impl EthClient {
+impl<C, S> EthClient<C, S> where C: BlockChainClient, S: SyncStatusProvider {
 	/// Creates new EthClient.
-	pub fn new(client: &Arc<Client>, sync: &Arc<EthSync>) -> Self {
+	pub fn new(client: &Arc<C>, sync: &Arc<S>) -> Self {
 		EthClient {
 			client: Arc::downgrade(client),
 			sync: Arc::downgrade(sync),
@@ -95,7 +94,7 @@ impl EthClient {
 	}
 }
 
-impl Eth for EthClient {
+impl<C, S> Eth for EthClient<C, S> where C: BlockChainClient + 'static, S: SyncStatusProvider + 'static {
 	fn protocol_version(&self, params: Params) -> Result<Value, Error> {
 		match params {
 			Params::None => to_value(&U256::from(take_weak!(self.sync).status().protocol_version)),
@@ -256,14 +255,14 @@ impl Eth for EthClient {
 }
 
 /// Eth filter rpc implementation.
-pub struct EthFilterClient {
-	client: Weak<Client>,
+pub struct EthFilterClient<C> where C: BlockChainClient {
+	client: Weak<C>,
 	polls: Mutex<PollManager<PollFilter>>,
 }
 
-impl EthFilterClient {
+impl<C> EthFilterClient<C> where C: BlockChainClient {
 	/// Creates new Eth filter client.
-	pub fn new(client: &Arc<Client>) -> Self {
+	pub fn new(client: &Arc<C>) -> Self {
 		EthFilterClient {
 			client: Arc::downgrade(client),
 			polls: Mutex::new(PollManager::new())
@@ -271,7 +270,7 @@ impl EthFilterClient {
 	}
 }
 
-impl EthFilter for EthFilterClient {
+impl<C> EthFilter for EthFilterClient<C> where C: BlockChainClient + 'static {
 	fn new_filter(&self, params: Params) -> Result<Value, Error> {
 		from_params::<(Filter,)>(params)
 			.and_then(|(filter,)| {
diff --git a/rpc/src/v1/impls/net.rs b/rpc/src/v1/impls/net.rs
index 9e24caad2..a686ed66f 100644
--- a/rpc/src/v1/impls/net.rs
+++ b/rpc/src/v1/impls/net.rs
@@ -17,24 +17,24 @@
 //! Net rpc implementation.
 use std::sync::{Arc, Weak};
 use jsonrpc_core::*;
-use ethsync::EthSync;
+use ethsync::SyncStatusProvider;
 use v1::traits::Net;
 
 /// Net rpc implementation.
-pub struct NetClient {
-	sync: Weak<EthSync>
+pub struct NetClient<S> where S: SyncStatusProvider {
+	sync: Weak<S>
 }
 
-impl NetClient {
+impl<S> NetClient<S> where S: SyncStatusProvider {
 	/// Creates new NetClient.
-	pub fn new(sync: &Arc<EthSync>) -> Self {
+	pub fn new(sync: &Arc<S>) -> Self {
 		NetClient {
 			sync: Arc::downgrade(sync)
 		}
 	}
 }
 
-impl Net for NetClient {
+impl<S> Net for NetClient<S> where S: SyncStatusProvider + 'static {
 	fn version(&self, _: Params) -> Result<Value, Error> {
 		Ok(Value::U64(take_weak!(self.sync).status().protocol_version as u64))
 	}
diff --git a/sync/src/lib.rs b/sync/src/lib.rs
index 20f13fb84..5a0ba79c5 100644
--- a/sync/src/lib.rs
+++ b/sync/src/lib.rs
@@ -94,6 +94,12 @@ impl Default for SyncConfig {
 	}
 }
 
+/// Current sync status
+pub trait SyncStatusProvider: Send + Sync {
+	/// Get sync status
+	fn status(&self) -> SyncStatus;
+}
+
 /// Ethereum network protocol handler
 pub struct EthSync {
 	/// Shared blockchain client. TODO: this should evetually become an IPC endpoint
@@ -115,11 +121,6 @@ impl EthSync {
 		sync
 	}
 
-	/// Get sync status
-	pub fn status(&self) -> SyncStatus {
-		self.sync.read().unwrap().status()
-	}
-
 	/// Stop sync
 	pub fn stop(&mut self, io: &mut NetworkContext<SyncMessage>) {
 		self.sync.write().unwrap().abort(&mut NetSyncIo::new(io, self.chain.deref()));
@@ -140,6 +141,13 @@ impl EthSync {
 	}
 }
 
+impl SyncStatusProvider for EthSync {
+	/// Get sync status
+	fn status(&self) -> SyncStatus {
+		self.sync.read().unwrap().status()
+	}
+}
+
 impl NetworkProtocolHandler<SyncMessage> for EthSync {
 	fn initialize(&self, io: &NetworkContext<SyncMessage>) {
 		io.register_timer(0, 1000).expect("Error registering sync timer");
diff --git a/sync/src/tests/helpers.rs b/sync/src/tests/helpers.rs
index d01dba0b2..253587f11 100644
--- a/sync/src/tests/helpers.rs
+++ b/sync/src/tests/helpers.rs
@@ -25,6 +25,7 @@ use ethcore::receipt::Receipt;
 use ethcore::transaction::{LocalizedTransaction, Transaction, Action};
 use ethcore::filter::Filter;
 use ethcore::log_entry::LocalizedLogEntry;
+use ethcore::block::ClosedBlock;
 
 pub struct TestBlockChainClient {
 	pub blocks: RwLock<HashMap<H256, Bytes>>,
@@ -160,6 +161,14 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
+	fn sealing_block(&self) -> &Mutex<Option<ClosedBlock>> {
+		unimplemented!();
+	}
+
+	fn submit_seal(&self, _pow_hash: H256, _seal: Vec<Bytes>) -> Result<(), Error> {
+		unimplemented!();
+	}
+
 	fn block_header(&self, id: BlockId) -> Option<Bytes> {
 		self.block_hash(id).and_then(|hash| self.blocks.read().unwrap().get(&hash).map(|r| Rlp::new(r).at(0).as_raw().to_vec()))
 	}