diff --git a/rpc/src/v1/impls/ethcore.rs b/rpc/src/v1/impls/ethcore.rs
index 25d9bd2ae..7c1b30974 100644
--- a/rpc/src/v1/impls/ethcore.rs
+++ b/rpc/src/v1/impls/ethcore.rs
@@ -26,7 +26,6 @@ use ethminer::MinerService;
 use ethcore::client::BlockChainClient;
 use ethcore::trace::VMTrace;
 use ethcore::transaction::{Transaction as EthTransaction, SignedTransaction, Action};
-use ethcore::get_info;
 use v1::traits::Ethcore;
 use v1::types::{Bytes, CallRequest};
 
@@ -81,8 +80,7 @@ fn vm_trace_to_object(t: &VMTrace) -> Value {
 		.map(|(i, op)| {
 			let mut m = map![
 				"pc".to_owned() => to_value(&op.pc).unwrap(),
-				"inst".to_owned() => to_value(&get_info(op.instruction).name).unwrap(),
-				"gas_cost".to_owned() => to_value(&op.gas_cost).unwrap(),
+				"cost".to_owned() => to_value(&op.gas_cost).unwrap(),
 				"stack".to_owned() => to_value(&op.stack).unwrap()
 			];
 			if next_sub.is_some() && next_sub.unwrap().parent_step == i {
diff --git a/rpc/src/v1/tests/mocked/eth.rs b/rpc/src/v1/tests/mocked/eth.rs
index 32a2cd99a..3e9c67f46 100644
--- a/rpc/src/v1/tests/mocked/eth.rs
+++ b/rpc/src/v1/tests/mocked/eth.rs
@@ -353,6 +353,7 @@ fn rpc_eth_call() {
 		contracts_created: vec![],
 		output: vec![0x12, 0x34, 0xff],
 		trace: None,
+		vm_trace: None,
 	});
 
 	let request = r#"{
@@ -386,6 +387,7 @@ fn rpc_eth_call_default_block() {
 		contracts_created: vec![],
 		output: vec![0x12, 0x34, 0xff],
 		trace: None,
+		vm_trace: None,
 	});
 
 	let request = r#"{
@@ -418,6 +420,7 @@ fn rpc_eth_estimate_gas() {
 		contracts_created: vec![],
 		output: vec![0x12, 0x34, 0xff],
 		trace: None,
+		vm_trace: None,
 	});
 
 	let request = r#"{
@@ -451,6 +454,7 @@ fn rpc_eth_estimate_gas_default_block() {
 		contracts_created: vec![],
 		output: vec![0x12, 0x34, 0xff],
 		trace: None,
+		vm_trace: None,
 	});
 
 	let request = r#"{
diff --git a/rpc/src/v1/tests/mocked/ethcore.rs b/rpc/src/v1/tests/mocked/ethcore.rs
index cc822daef..74da13535 100644
--- a/rpc/src/v1/tests/mocked/ethcore.rs
+++ b/rpc/src/v1/tests/mocked/ethcore.rs
@@ -19,16 +19,22 @@ use std::str::FromStr;
 use jsonrpc_core::IoHandler;
 use v1::{Ethcore, EthcoreClient};
 use ethminer::MinerService;
+use ethcore::client::{TestBlockChainClient};
 use v1::tests::helpers::TestMinerService;
 use util::numbers::*;
 use rustc_serialize::hex::FromHex;
 use util::log::RotatingLogger;
 use util::network_settings::NetworkSettings;
 
+fn blockchain_client() -> Arc<TestBlockChainClient> {
+	let client = TestBlockChainClient::new();
+	Arc::new(client)
+}
 
 fn miner_service() -> Arc<TestMinerService> {
 	Arc::new(TestMinerService::default())
 }
+
 fn logger() -> Arc<RotatingLogger> {
 	Arc::new(RotatingLogger::new("rpc=trace".to_owned()))
 }
@@ -45,14 +51,15 @@ fn settings() -> Arc<NetworkSettings> {
 	})
 }
 
-fn ethcore_client(miner: &Arc<TestMinerService>) -> EthcoreClient<TestMinerService> {
-	EthcoreClient::new(&miner, logger(), settings())
+fn ethcore_client(client: &Arc<TestBlockChainClient>, miner: &Arc<TestMinerService>) -> EthcoreClient<TestBlockChainClient, TestMinerService> {
+	EthcoreClient::new(&client, &miner, logger(), settings())
 }
 
 #[test]
 fn rpc_ethcore_extra_data() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -68,7 +75,8 @@ fn rpc_ethcore_default_extra_data() {
 	use util::ToPretty;
 
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -81,7 +89,8 @@ fn rpc_ethcore_default_extra_data() {
 #[test]
 fn rpc_ethcore_gas_floor_target() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -94,7 +103,8 @@ fn rpc_ethcore_gas_floor_target() {
 #[test]
 fn rpc_ethcore_min_gas_price() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -107,7 +117,8 @@ fn rpc_ethcore_min_gas_price() {
 #[test]
 fn rpc_ethcore_set_min_gas_price() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -121,7 +132,8 @@ fn rpc_ethcore_set_min_gas_price() {
 #[test]
 fn rpc_ethcore_set_gas_floor_target() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -135,7 +147,8 @@ fn rpc_ethcore_set_gas_floor_target() {
 #[test]
 fn rpc_ethcore_set_extra_data() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -149,7 +162,8 @@ fn rpc_ethcore_set_extra_data() {
 #[test]
 fn rpc_ethcore_set_author() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -163,10 +177,11 @@ fn rpc_ethcore_set_author() {
 #[test]
 fn rpc_ethcore_dev_logs() {
 	let miner = miner_service();
+	let client = blockchain_client();
 	let logger = logger();
 	logger.append("a".to_owned());
 	logger.append("b".to_owned());
-	let ethcore = EthcoreClient::new(&miner, logger.clone(), settings()).to_delegate();
+	let ethcore = EthcoreClient::new(&client, &miner, logger.clone(), settings()).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -179,7 +194,8 @@ fn rpc_ethcore_dev_logs() {
 #[test]
 fn rpc_ethcore_dev_logs_levels() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -191,7 +207,8 @@ fn rpc_ethcore_dev_logs_levels() {
 #[test]
 fn rpc_ethcore_set_transactions_limit() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -205,7 +222,8 @@ fn rpc_ethcore_set_transactions_limit() {
 #[test]
 fn rpc_ethcore_transactions_limit() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -218,7 +236,8 @@ fn rpc_ethcore_transactions_limit() {
 #[test]
 fn rpc_ethcore_net_chain() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -231,7 +250,8 @@ fn rpc_ethcore_net_chain() {
 #[test]
 fn rpc_ethcore_net_max_peers() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -244,7 +264,8 @@ fn rpc_ethcore_net_max_peers() {
 #[test]
 fn rpc_ethcore_net_port() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -257,7 +278,8 @@ fn rpc_ethcore_net_port() {
 #[test]
 fn rpc_ethcore_rpc_settings() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);
 
@@ -270,7 +292,8 @@ fn rpc_ethcore_rpc_settings() {
 #[test]
 fn rpc_ethcore_node_name() {
 	let miner = miner_service();
-	let ethcore = ethcore_client(&miner).to_delegate();
+	let client = blockchain_client();
+	let ethcore = ethcore_client(&client, &miner).to_delegate();
 	let io = IoHandler::new();
 	io.add_delegate(ethcore);