diff --git a/ethereumj-core/pom.xml b/ethereumj-core/pom.xml
index ba9bbc18..2b528be4 100644
--- a/ethereumj-core/pom.xml
+++ b/ethereumj-core/pom.xml
@@ -9,7 +9,6 @@
 	<url>http://www.ethereumj.org</url>
 
 <!--
-
 * To deploy all the classes and dependencies to one jar,
 * that's one option to pack stand alone.
 mvn clean package dependency:copy-dependencies -Dmaven.test.skip=true
@@ -100,7 +99,7 @@ mvn clean package -Dmaven.test.skip=true
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.7</version>
+            <version>${slf4j.version}</version>
             <scope>compile</scope>
         </dependency>
 
@@ -109,7 +108,7 @@ mvn clean package -Dmaven.test.skip=true
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>jcl-over-slf4j</artifactId>
-            <version>1.5.6</version>
+            <version>${slf4j.version}</version>
             <scope>runtime</scope>
         </dependency>
 
@@ -118,7 +117,7 @@ mvn clean package -Dmaven.test.skip=true
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>1.7.5</version>
+            <version>${slf4j.version}</version>
             <scope>runtime</scope>
         </dependency>
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/core/Transaction.java b/ethereumj-core/src/main/java/org/ethereum/core/Transaction.java
index 12dc74f8..e3dfa340 100644
--- a/ethereumj-core/src/main/java/org/ethereum/core/Transaction.java
+++ b/ethereumj-core/src/main/java/org/ethereum/core/Transaction.java
@@ -7,6 +7,8 @@ import org.ethereum.util.ByteUtil;
 import org.ethereum.util.RLP;
 import org.ethereum.util.RLPItem;
 import org.ethereum.util.RLPList;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.spongycastle.util.BigIntegers;
 
 import java.security.SignatureException;
@@ -22,6 +24,8 @@ import java.util.Arrays;
  */
 public class Transaction {
 
+	Logger logger = LoggerFactory.getLogger(this.getClass());
+	
     private static final int CALL_SIZE = 9;
     private static final int CONTRACT_SIZE = 10;
 	
@@ -183,16 +187,14 @@ public class Transaction {
         return ECKey.recoverFromSignature(signature.v, signature, hash, true);
     }
 
-    public byte[] sender() {
-
-        ECKey key = null;
-        try {
-            key = ECKey.signatureToKey(getHash(), getSignature().toBase64());
-        } catch (SignatureException e) {
-            e.printStackTrace();
-        }
-
-        return key.getAddress();
+    public byte[] getSender() {
+		try {
+			ECKey key = ECKey.signatureToKey(getHash(), getSignature().toBase64());
+			return key.getAddress();
+		} catch (SignatureException e) {
+			logger.error(e.getMessage(), e);
+		}
+		return null;
     }
 
     public void sign(byte[] privKeyBytes) throws Exception {
diff --git a/ethereumj-core/src/main/java/org/ethereum/core/Wallet.java b/ethereumj-core/src/main/java/org/ethereum/core/Wallet.java
index d223b87e..ace93ff9 100644
--- a/ethereumj-core/src/main/java/org/ethereum/core/Wallet.java
+++ b/ethereumj-core/src/main/java/org/ethereum/core/Wallet.java
@@ -37,7 +37,7 @@ public class Wallet {
     private HashMap<String, AddressState> rows = new HashMap<String, AddressState>();
     private long high;
 
-    private List<WalletListener> listeners = new ArrayList();
+    private List<WalletListener> listeners = new ArrayList<WalletListener>();
 
     public void addNewKey(){
 
@@ -96,7 +96,7 @@ public class Wallet {
         for (Transaction tx : transactions){
 
 
-            byte[] senderAddress = tx.sender();
+            byte[] senderAddress = tx.getSender();
             AddressState senderState =  rows.get(Hex.toHexString(senderAddress));
             if (senderState != null){
                 BigInteger value = new BigInteger(tx.getValue());
@@ -169,9 +169,6 @@ public class Wallet {
 //            this.importKey(privKey);
 //            this.setBalance(address, value);
         }
-
-
-
     }
 
     /**
@@ -257,7 +254,6 @@ public class Wallet {
         public void valueChanged();
     }
 
-
     public long getHigh() {
         return high;
     }
diff --git a/ethereumj-core/src/main/java/org/ethereum/geodb/IpGeoDB.java b/ethereumj-core/src/main/java/org/ethereum/geodb/IpGeoDB.java
index d0752535..3209e9a5 100644
--- a/ethereumj-core/src/main/java/org/ethereum/geodb/IpGeoDB.java
+++ b/ethereumj-core/src/main/java/org/ethereum/geodb/IpGeoDB.java
@@ -2,7 +2,6 @@ package org.ethereum.geodb;
 
 import java.io.File;
 import java.net.InetAddress;
-import java.net.URISyntaxException;
 import java.net.URL;
 
 import com.maxmind.geoip.Location;
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/BlockTableModel.java b/ethereumj-core/src/main/java/org/ethereum/gui/BlockTableModel.java
index 3b9b4116..12fa0f7d 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/BlockTableModel.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/BlockTableModel.java
@@ -1,7 +1,6 @@
 package org.ethereum.gui;
 
 import org.ethereum.manager.MainData;
-import org.spongycastle.util.encoders.Hex;
 
 import javax.swing.table.AbstractTableModel;
 
@@ -12,8 +11,6 @@ import javax.swing.table.AbstractTableModel;
  */
 public class BlockTableModel  extends AbstractTableModel {
 
-
-
     @Override
     public int getRowCount() {
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/ConnectionConsoleWindow.java b/ethereumj-core/src/main/java/org/ethereum/gui/ConnectionConsoleWindow.java
index 8ea11f51..899667ec 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/ConnectionConsoleWindow.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/ConnectionConsoleWindow.java
@@ -69,17 +69,12 @@ public class ConnectionConsoleWindow extends JFrame implements PeerListener{
                 Thread t = new Thread() {
                     public void run() {
 
-//                        new ClientPeer(thisConsole).connect("54.201.28.117", 30303);  // peer discovery
-//                        new ClientPeer(thisConsole).connect("82.217.72.169", 30303);  // Nick
-
-//                        new ClientPeer(thisConsole).connect("131.104.247.135", 30303);  // Some dude in Canada
-
-
-//                        new ClientPeer(thisConsole).connect("54.204.10.41", 30303);
-
-//                        new ClientPeer(thisConsole).connect("54.204.10.41", 30303);	// CPP: ZeroGox Poc5
+//                    	new ClientPeer(thisConsole).connect("54.201.28.117", 30303);  // peer discovery
+//                    	new ClientPeer(thisConsole).connect("54.204.10.41", 30303);	
+//                    	new ClientPeer(thisConsole).connect("131.104.247.135", 30303);  // Some dude in Canada
+//                    	new ClientPeer(thisConsole).connect("82.217.72.169", 30303);  // Nick
+//                    	new ClientPeer(thisConsole).connect("54.204.10.41", 30303);	// CPP: ZeroGox Poc5
                         new ClientPeer(thisConsole).connect("54.211.14.10", 40404);		// RomanJ
-
 //                        new ClientPeer(thisConsole).connect("192.168.1.102", 30303);
                     }
                 };
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/PayOutDialog.java b/ethereumj-core/src/main/java/org/ethereum/gui/PayOutDialog.java
index f343e797..a4921ce8 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/PayOutDialog.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/PayOutDialog.java
@@ -1,7 +1,6 @@
 package org.ethereum.gui;
 
 import org.ethereum.core.Transaction;
-import org.ethereum.crypto.HashUtil;
 import org.ethereum.manager.MainData;
 import org.ethereum.net.client.ClientPeer;
 import org.ethereum.wallet.AddressState;
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableModel.java b/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableModel.java
index 6ab46715..55f1bdcf 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableModel.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableModel.java
@@ -2,7 +2,6 @@ package org.ethereum.gui;
 
 import java.net.InetAddress;
 import java.net.URL;
-import java.net.UnknownHostException;
 import java.util.*;
 
 import javax.swing.ImageIcon;
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableWindow.java b/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableWindow.java
index 91c2c323..7994d148 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableWindow.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/PeersTableWindow.java
@@ -1,6 +1,5 @@
 package org.ethereum.gui;
 
-import org.ethereum.config.SystemProperties;
 import org.ethereum.manager.MainData;
 
 import java.awt.*;
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/ToolBar.java b/ethereumj-core/src/main/java/org/ethereum/gui/ToolBar.java
index 6847c174..95686343 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/ToolBar.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/ToolBar.java
@@ -8,8 +8,6 @@ import org.slf4j.LoggerFactory;
 import javax.swing.*;
 
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
 import java.awt.event.ItemEvent;
 import java.awt.event.ItemListener;
 
@@ -35,7 +33,7 @@ public class ToolBar extends JFrame {
         introLogger.info("");
         introLogger.info("♢ EthereumJ [v0.5.1] ");
         introLogger.info("♢ Code by Roman Mandeleil, (c) 2014.");
-        introLogger.info("♢ Based on a design by Vitaly Buterin.");
+        introLogger.info("♢ Based on a design by Vitalik Buterin.");
         introLogger.info("");
         introLogger.info("java.version: " + System.getProperty("java.version"));
         introLogger.info("java.home:    " + System.getProperty("java.home"));
@@ -47,9 +45,6 @@ public class ToolBar extends JFrame {
             System.exit(0);
         }
 
-
-
-
         final JPanel cp = new JPanel(new FlowLayout());
         cp.setBackground(Color.WHITE);
 
@@ -160,7 +155,6 @@ public class ToolBar extends JFrame {
             }
         });
 
-
         JToggleButton chainToggle = new JToggleButton();
         chainToggle.setIcon(image_4);
         chainToggle.setToolTipText("Block Chain");
@@ -221,17 +215,14 @@ public class ToolBar extends JFrame {
         cp.add(chainToggle);
         cp.add(walletToggle);
 
-
         MainData.instance.toString();
     }
 
     public static void main(String args[]){
-
         SwingUtilities.invokeLater(new Runnable() {
             public void run() {
                 new ToolBar().setVisible(true);
             }
         });
     }
-
 }
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/WalletAddressPanel.java b/ethereumj-core/src/main/java/org/ethereum/gui/WalletAddressPanel.java
index 26f09724..b5223e8e 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/WalletAddressPanel.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/WalletAddressPanel.java
@@ -11,7 +11,6 @@ import javax.swing.border.EmptyBorder;
 import java.awt.*;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
-import java.math.BigInteger;
 import java.net.URL;
 
 /**
diff --git a/ethereumj-core/src/main/java/org/ethereum/gui/WalletSumPanel.java b/ethereumj-core/src/main/java/org/ethereum/gui/WalletSumPanel.java
index b65f8a13..1fb255f6 100644
--- a/ethereumj-core/src/main/java/org/ethereum/gui/WalletSumPanel.java
+++ b/ethereumj-core/src/main/java/org/ethereum/gui/WalletSumPanel.java
@@ -7,8 +7,6 @@ import javax.swing.border.Border;
 import javax.swing.border.CompoundBorder;
 import javax.swing.border.EmptyBorder;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
 import java.math.BigInteger;
diff --git a/ethereumj-core/src/main/java/org/ethereum/manager/MainData.java b/ethereumj-core/src/main/java/org/ethereum/manager/MainData.java
index 4e3b4c90..3e805755 100644
--- a/ethereumj-core/src/main/java/org/ethereum/manager/MainData.java
+++ b/ethereumj-core/src/main/java/org/ethereum/manager/MainData.java
@@ -18,7 +18,6 @@ import org.ethereum.net.client.ClientPeer;
 import org.ethereum.net.client.PeerData;
 import org.ethereum.net.message.StaticMessages;
 import org.ethereum.net.peerdiscovery.PeerDiscovery;
-import org.ethereum.net.peerdiscovery.WorkerThread;
 import org.ethereum.wallet.AddressState;
 import org.spongycastle.util.encoders.Hex;
 
@@ -49,7 +48,7 @@ public class MainData {
 
         wallet.importKey(cowAddr);
         AddressState state = wallet.getAddressState(key.getAddress());
-        state.addToBalance(new BigInteger("1606938044258990275541962092341162602522202993782792835301376"));
+        state.addToBalance(BigInteger.valueOf(2).pow(200)); // 1606938044258990275541962092341162602522202993782792835301376
         wallet.importKey(HashUtil.sha3("cat".getBytes()));
 
         peerDiscovery = new PeerDiscovery(peers);
diff --git a/ethereumj-core/src/main/java/org/ethereum/net/message/BlocksMessage.java b/ethereumj-core/src/main/java/org/ethereum/net/message/BlocksMessage.java
index 9086f774..ec05167d 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/message/BlocksMessage.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/message/BlocksMessage.java
@@ -6,7 +6,6 @@ import java.util.List;
 import static org.ethereum.net.Command.BLOCKS;
 
 import org.ethereum.core.Block;
-import org.ethereum.core.Transaction;
 import org.ethereum.net.Command;
 import org.ethereum.util.RLPItem;
 import org.ethereum.util.RLPList;
diff --git a/ethereumj-core/src/main/java/org/ethereum/net/message/StaticMessages.java b/ethereumj-core/src/main/java/org/ethereum/net/message/StaticMessages.java
index a165cc98..fae0861c 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/message/StaticMessages.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/message/StaticMessages.java
@@ -23,7 +23,7 @@ public class StaticMessages {
 
         byte[] peerIdBytes = HashUtil.randomPeerId();
 
-        HELLO_MESSAGE = new HelloMessage((byte)0x11, (byte)0x00, "EthereumJ [v0.5.1] by RomanJ  ",
+        HELLO_MESSAGE = new HelloMessage((byte)0x11, (byte)0x00, "EthereumJ [v0.5.1] by RomanJ",
                 (byte)0b00000111, (short)30303, peerIdBytes);
     }
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerDiscovery.java b/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerDiscovery.java
index c992eeae..dd61a274 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerDiscovery.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerDiscovery.java
@@ -1,7 +1,5 @@
 package org.ethereum.net.peerdiscovery;
 
-
-import org.ethereum.config.SystemProperties;
 import org.ethereum.net.client.PeerData;
 
 import java.util.List;
diff --git a/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerTaster.java b/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerTaster.java
index df2f3d70..45ee9ed2 100644
--- a/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerTaster.java
+++ b/ethereumj-core/src/main/java/org/ethereum/net/peerdiscovery/PeerTaster.java
@@ -5,19 +5,13 @@ import io.netty.channel.*;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.nio.NioSocketChannel;
 import io.netty.handler.timeout.ReadTimeoutHandler;
-import org.ethereum.config.SystemProperties;
 import org.ethereum.gui.PeerListener;
-import org.ethereum.manager.MainData;
 import org.ethereum.net.client.EthereumFrameDecoder;
-import org.ethereum.net.client.PeerData;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.ArrayList;
-
 import static org.ethereum.config.SystemProperties.config;
 
-
 /**
  * www.ethereumJ.com
  * User: Roman Mandeleil
@@ -59,7 +53,6 @@ public class PeerTaster {
                 }
             });
 
-
             // Start the client.
             b.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, config.peerDiscoveryTimeout());
             ChannelFuture f = b.connect(host, port).sync(); // (5)
diff --git a/ethereumj-core/src/main/java/org/ethereum/serpent/ParserGenerator.java b/ethereumj-core/src/main/java/org/ethereum/serpent/ParserGenerator.java
index 1cf194ba..7894dbd8 100644
--- a/ethereumj-core/src/main/java/org/ethereum/serpent/ParserGenerator.java
+++ b/ethereumj-core/src/main/java/org/ethereum/serpent/ParserGenerator.java
@@ -1,18 +1,11 @@
 package org.ethereum.serpent;
 
-import org.antlr.mojo.antlr4.Antlr4ErrorLog;
-import org.antlr.mojo.antlr4.Antlr4Mojo;
+import java.io.File;
+
 import org.antlr.v4.Tool;
-import org.antlr.v4.codegen.CodeGenerator;
-import org.antlr.v4.tool.Grammar;
 import org.apache.maven.plugin.MojoExecutionException;
 import org.apache.maven.plugin.MojoFailureException;
 
-import java.io.*;
-import java.net.URI;
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * www.ethereumJ.com
  * User: Roman Mandeleil
@@ -20,27 +13,19 @@ import java.util.Map;
  */
 public class ParserGenerator {
 
-
-
     public static void main(String args[]) throws MojoFailureException, MojoExecutionException {
 
         String userDir = System.getProperty("user.dir");
 
-
         String grammarName = userDir + "\\src\\main\\java\\org\\ethereum\\serpent\\Serpent.g4";
 
-
         File inputDir = new File(userDir + "\\src\\main\\java\\org\\ethereum\\serpent\\");
 
-
         String options[] = {grammarName, "-visitor",  "-package", "org.ethereum.serpent"};
         Tool tool = new Tool(options);
         tool.outputDirectory = userDir + "\\src\\main\\java\\org\\ethereum\\serpent\\";
         tool.processGrammarsOnCommandLine();
 
-
-
-
 //        org.antlr.Tool.main(new String[]{userDir + "\\src\\main\\java\\org\\ethereum\\serpent\\Serpent.g4"});
 //        org.antlr.Tool.main(new String[]{userDir + "\\src\\main\\java\\samples\\antlr\\PyEsque.g"});
 
diff --git a/ethereumj-core/src/main/java/org/ethereum/util/RLPList.java b/ethereumj-core/src/main/java/org/ethereum/util/RLPList.java
index 5b692834..a37369be 100644
--- a/ethereumj-core/src/main/java/org/ethereum/util/RLPList.java
+++ b/ethereumj-core/src/main/java/org/ethereum/util/RLPList.java
@@ -2,8 +2,6 @@ package org.ethereum.util;
 
 import java.util.ArrayList;
 
-import org.spongycastle.util.encoders.Hex;
-
 /**
  * www.ethereumJ.com
  * User: Roman Mandeleil
diff --git a/ethereumj-core/src/test/java/org/ethereum/core/TransactionTest.java b/ethereumj-core/src/test/java/org/ethereum/core/TransactionTest.java
index 9be8691c..086b8553 100644
--- a/ethereumj-core/src/test/java/org/ethereum/core/TransactionTest.java
+++ b/ethereumj-core/src/test/java/org/ethereum/core/TransactionTest.java
@@ -157,7 +157,7 @@ public class TransactionTest {
 
         byte[] encodedTxBytes = Hex.decode("f86f81018609184e72a0008242559479b08ad8787060333663d19704909ee7b1903e58893635c9adc5dea00000801ba056f49cb76f7daadd0e7eb523a8c942a2b510f450185c93a3e2e51a749642f0efa03374f71fa8855212d8c369be6ced2801a8a7b6d7cea3a578623ad34feceef12f");
         Transaction tx = new Transaction(encodedTxBytes);
-        System.out.println(Hex.toHexString( tx.sender() ));
+        System.out.println(Hex.toHexString( tx.getSender() ));
         System.out.println(Hex.toHexString( tx.getHash() ));
         System.out.println(Hex.toHexString( tx.getEncoded() ));
     }
diff --git a/ethereumj-core/src/test/java/org/ethereum/serpent/SerpentCompileTest.java b/ethereumj-core/src/test/java/org/ethereum/serpent/SerpentCompileTest.java
index 034cb7ae..1d4d7d50 100644
--- a/ethereumj-core/src/test/java/org/ethereum/serpent/SerpentCompileTest.java
+++ b/ethereumj-core/src/test/java/org/ethereum/serpent/SerpentCompileTest.java
@@ -737,7 +737,6 @@ public class SerpentCompileTest {
         Assert.assertEquals(expected, result);
     }
 
-
     @Test    // if elif else test 13
     public void test28(){
 
@@ -775,7 +774,6 @@ public class SerpentCompileTest {
         Assert.assertEquals(expected, result);
     }
 
-
     @Test    // if elif else test 14
     public void test29(){
 
@@ -913,7 +911,6 @@ public class SerpentCompileTest {
         Assert.fail("Should be indent error thrown");
     }
 
-
     @Test    // if elif else test 19
     public void test34(){
 
@@ -957,8 +954,6 @@ public class SerpentCompileTest {
         Assert.assertEquals(expected, result);
     }
 
-
-
     @Test    // if elif else test 20
     public void test35(){
 
@@ -1003,7 +998,6 @@ public class SerpentCompileTest {
         Assert.assertEquals(expected, result);
     }
 
-
     @Test    // while test 1
     public void test36(){
 
@@ -1075,7 +1069,6 @@ public class SerpentCompileTest {
         Assert.assertEquals(expected, result);
     }
 
-
     @Test    // while test 3
     public void test38(){
 
@@ -1218,11 +1211,8 @@ public class SerpentCompileTest {
 
         Assert.assertEquals(expected, result);
     }
-
-
-
 /*
-
+ * 
 a = msg.datasize
 b = msg.sender
 c = msg.value
diff --git a/ethereumj-core/src/test/java/org/ethereum/util/UtilsTest.java b/ethereumj-core/src/test/java/org/ethereum/util/UtilsTest.java
index 0790ff53..077dc04c 100644
--- a/ethereumj-core/src/test/java/org/ethereum/util/UtilsTest.java
+++ b/ethereumj-core/src/test/java/org/ethereum/util/UtilsTest.java
@@ -1,6 +1,5 @@
 package org.ethereum.util;
 
-import junit.framework.Assert;
 import org.junit.Test;
 import org.spongycastle.util.encoders.Hex;