diff --git a/src/evm/executive.rs b/src/evm/executive.rs
index 95de150c5..f509ae4d1 100644
--- a/src/evm/executive.rs
+++ b/src/evm/executive.rs
@@ -40,6 +40,10 @@ impl Substate {
 		}
 	}
 
+	pub fn logs(&self) -> &[LogEntry] {
+		&self.logs
+	}
+
 	/// Appends another substate to this substate.
 	fn accrue(&mut self, s: Substate) {
 		self.suicides.extend(s.suicides.into_iter());
@@ -203,7 +207,7 @@ impl<'a> Executive<'a> {
 	}
 
 	/// Finalizes the transaction (does refunds and suicides).
-	fn finalize(&self, substate: Substate, gas: U256, gas_used: U256) {
+	fn finalize(&mut self, substate: Substate, gas: U256, gas_used: U256) {
 		let schedule = self.engine.evm_schedule(self.info);
 
 		// refunds from SSTORE nonzero -> zero
@@ -214,7 +218,9 @@ impl<'a> Executive<'a> {
 		let refund = cmp::min(sstore_refunds + suicide_refunds, (gas - gas_used) / U256::from(2));
 
 		// perform suicides
-		//self.state.
+		for address in substate.suicides.iter() {
+			self.state.kill_account(address);
+		}
 	}
 }
 
@@ -248,8 +254,8 @@ impl<'a> Ext for Externalities<'a> {
 	}
 
 	fn sstore(&mut self, key: H256, value: H256) {
+		// if SSTORE nonzero -> zero, increment refund count
 		if value == H256::new() && self.state.storage_at(&self.params.address, &key) != H256::new() {
-			//self.substate.refunds_count = self.substate.refunds_count + U256::from(self.engine.evm_schedule(self.info).sstore_refund_gas);
 			self.substate.refunds_count = self.substate.refunds_count + U256::one();
 		}
 		self.state.set_storage(&self.params.address, key, value)
@@ -269,9 +275,9 @@ impl<'a> Ext for Externalities<'a> {
 		}
 	}
 
-	fn create(&mut self, gas: u64, endowment: &U256, code: &[u8]) -> (Address, u64) {
+	fn create(&mut self, gas: u64, endowment: &U256, code: &[u8]) -> Option<(Address, u64)> {
 		match self.state.balance(&self.params.address) >= *endowment && self.depth < 1024 {
-			false => (Address::new(), gas),
+			false => None,
 			true => {
 				let address = contract_address(&self.params.address, &self.state.nonce(&self.params.address));
 				let params = EvmParams {
@@ -292,7 +298,7 @@ impl<'a> Ext for Externalities<'a> {
 					println!("res: {:?}", res);
 				}
 				self.substate.accrue(substate);
-				(address, gas)
+				Some((address, gas))
 			}
 		}
 	}
diff --git a/src/evm/ext.rs b/src/evm/ext.rs
index cca353965..46dc47ec7 100644
--- a/src/evm/ext.rs
+++ b/src/evm/ext.rs
@@ -18,11 +18,14 @@ pub trait Ext {
 	fn blockhash(&self, number: &U256) -> H256;
 
 	/// Creates new contract.
-	/// Returns new contract address and gas used.
-	fn create(&mut self, gas: u64, endowment: &U256, code: &[u8]) -> (Address, u64);
+	/// If contract creation is successfull, 
+	/// returns new contract address and gas used,
+	/// otherwise `None`.
+	fn create(&mut self, gas: u64, endowment: &U256, code: &[u8]) -> Option<(Address, u64)>;
 
-	/// Calls existing contract.
-	/// Returns call output and gas used.
+	/// Message call.
+	/// If call is successfull, returns call output and gas used,
+	/// otherwise `None`.
 	fn call(&mut self, gas: u64, call_gas: u64, receive_address: &Address, value: &U256, data: &[u8], code_address: &Address) -> Option<(Vec<u8>, u64)>;
 
 	/// Returns code at given address
diff --git a/src/evm/jit.rs b/src/evm/jit.rs
index 29defd33d..d15c8d3ee 100644
--- a/src/evm/jit.rs
+++ b/src/evm/jit.rs
@@ -208,9 +208,13 @@ impl<'a> evmjit::Ext for ExtAdapter<'a> {
 			  init_size: u64,
 			  address: *mut evmjit::H256) {
 		unsafe {
-			let (addr, gas) = self.ext.create(*io_gas, &U256::from_jit(&*endowment), slice::from_raw_parts(init_beg, init_size as usize));
-			*io_gas = gas;
-			*address = addr.into_jit();
+			match self.ext.create(*io_gas, &U256::from_jit(&*endowment), slice::from_raw_parts(init_beg, init_size as usize)) {
+				Some((addr, gas)) => {
+					*io_gas = gas;
+					*address = addr.into_jit();
+				},
+				None => ()
+			};
 		}
 	}
 
@@ -389,9 +393,10 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -411,9 +416,10 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -433,9 +439,10 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -456,9 +463,10 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -479,9 +487,10 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -518,9 +527,10 @@ mod tests {
 		state.init_code(&sender, sender_code);
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -542,9 +552,10 @@ mod tests {
 		state.add_balance(&address, &U256::from(0x10));
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -563,10 +574,13 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
-		let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
-		let evm = JitEvm;
-		assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
-		let logs = ext.logs();
+		let mut substate = Substate::new();
+		{
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
+			let evm = JitEvm;
+			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
+		}
+		let logs = substate.logs();
 		assert_eq!(logs.len(), 1);
 		let log = &logs[0];
 		assert_eq!(log.address(), &address);
@@ -594,10 +608,13 @@ mod tests {
 		let mut state = State::new_temp();
 		let info = EnvInfo::new();
 		let engine = TestEngine::new();
-		let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
-		let evm = JitEvm;
-		assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
-		let logs = ext.logs();
+		let mut substate = Substate::new();
+		{
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
+			let evm = JitEvm;
+			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
+		}
+		let logs = substate.logs();
 		assert_eq!(logs.len(), 1);
 		let log = &logs[0];
 		assert_eq!(log.address(), &address);
@@ -621,9 +638,10 @@ mod tests {
 		info.number = U256::one();
 		info.last_hashes.push(H256::from(address.clone()));
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}
@@ -645,9 +663,10 @@ mod tests {
 		info.number = U256::one();
 		info.last_hashes.push(H256::from(address.clone()));
 		let engine = TestEngine::new();
+		let mut substate = Substate::new();
 
 		{
-			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params);
+			let mut ext = Externalities::new(&mut state, &info, &engine, 0, &params, &mut substate);
 			let evm = JitEvm;
 			assert_eq!(evm.exec(&params, &mut ext), EvmResult::Stop);
 		}