diff --git a/graphenej/src/main/java/cy/agorise/graphenej/Address.java b/graphenej/src/main/java/cy/agorise/graphenej/Address.java
index 0a60048..94340c0 100644
--- a/graphenej/src/main/java/cy/agorise/graphenej/Address.java
+++ b/graphenej/src/main/java/cy/agorise/graphenej/Address.java
@@ -1,5 +1,6 @@
 package cy.agorise.graphenej;
 
+import com.google.common.base.Objects;
 import com.google.common.primitives.Bytes;
 import cy.agorise.graphenej.errors.MalformedAddressException;
 import org.bitcoinj.core.Base58;
@@ -61,4 +62,18 @@ public class Address {
         ripemd160Digest.doFinal(checksum, 0);
         return Arrays.copyOfRange(checksum, 0, 4);
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Address address = (Address) o;
+        return Objects.equal(publicKey, address.publicKey) &&
+                Objects.equal(prefix, address.prefix);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(publicKey, prefix);
+    }
 }
diff --git a/graphenej/src/main/java/cy/agorise/graphenej/Memo.java b/graphenej/src/main/java/cy/agorise/graphenej/Memo.java
index b5d2356..dddd10d 100644
--- a/graphenej/src/main/java/cy/agorise/graphenej/Memo.java
+++ b/graphenej/src/main/java/cy/agorise/graphenej/Memo.java
@@ -1,15 +1,11 @@
 package cy.agorise.graphenej;
 
 import com.google.common.primitives.Bytes;
-import com.google.gson.Gson;
-import com.google.gson.JsonDeserializationContext;
-import com.google.gson.JsonDeserializer;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonParseException;
-import com.google.gson.JsonSerializationContext;
-import com.google.gson.JsonSerializer;
-
+import com.google.gson.*;
+import cy.agorise.graphenej.errors.ChecksumException;
+import cy.agorise.graphenej.errors.MalformedAddressException;
+import cy.agorise.graphenej.interfaces.ByteSerializable;
+import cy.agorise.graphenej.interfaces.JsonSerializable;
 import org.bitcoinj.core.ECKey;
 import org.spongycastle.math.ec.ECPoint;
 
@@ -19,11 +15,6 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
 
-import cy.agorise.graphenej.errors.ChecksumException;
-import cy.agorise.graphenej.errors.MalformedAddressException;
-import cy.agorise.graphenej.interfaces.ByteSerializable;
-import cy.agorise.graphenej.interfaces.JsonSerializable;
-
 /**
  * Class used to represent a memo data structure
  * {@url https://bitshares.org/doxygen/structgraphene_1_1chain_1_1memo__data.html}
@@ -186,10 +177,6 @@ public class Memo implements ByteSerializable, JsonSerializable {
 
             byte[] seed = Bytes.concat(nonceBytes, Util.hexlify(Util.bytesToHex(ss)));
 
-            // Calculating checksum
-            byte[] sha256Msg = sha256.digest(message);
-
-
             // Applying decryption
             byte[] temp = Util.decryptAES(message, seed);
             byte[] checksum = Arrays.copyOfRange(temp, 0, 4);
@@ -201,7 +188,7 @@ public class Memo implements ByteSerializable, JsonSerializable {
                 throw new ChecksumException("Invalid checksum found while performing decryption");
             }
         } catch (NoSuchAlgorithmException e) {
-            System.out.println("NoSuchAlgotithmException. Msg:"+ e.getMessage());
+            System.out.println("NoSuchAlgorithmException. Msg:"+ e.getMessage());
         }
         return plaintext;
     }
diff --git a/graphenej/src/main/java/cy/agorise/graphenej/Util.java b/graphenej/src/main/java/cy/agorise/graphenej/Util.java
index 4f80a85..52a743d 100644
--- a/graphenej/src/main/java/cy/agorise/graphenej/Util.java
+++ b/graphenej/src/main/java/cy/agorise/graphenej/Util.java
@@ -2,7 +2,6 @@ package cy.agorise.graphenej;
 
 import com.google.common.primitives.Bytes;
 import com.google.common.primitives.UnsignedLong;
-
 import org.spongycastle.crypto.DataLengthException;
 import org.spongycastle.crypto.InvalidCipherTextException;
 import org.spongycastle.crypto.engines.AESFastEngine;
@@ -10,13 +9,7 @@ import org.spongycastle.crypto.modes.CBCBlockCipher;
 import org.spongycastle.crypto.paddings.PaddedBufferedBlockCipher;
 import org.spongycastle.crypto.params.KeyParameter;
 import org.spongycastle.crypto.params.ParametersWithIV;
-import org.tukaani.xz.CorruptedInputException;
-import org.tukaani.xz.FinishableOutputStream;
-import org.tukaani.xz.LZMA2Options;
-import org.tukaani.xz.LZMAInputStream;
-import org.tukaani.xz.LZMAOutputStream;
-import org.tukaani.xz.XZInputStream;
-import org.tukaani.xz.XZOutputStream;
+import org.tukaani.xz.*;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -320,7 +313,9 @@ public class Util {
             }
             
             byte[] temp = new byte[count];
-            System.arraycopy(out, out.length - count, temp, 0, temp.length);
+            int srcPos = out.length - count > 0 ? out.length - count : 0;
+            int length = count < out.length ? count : out.length;
+            System.arraycopy(out, srcPos, temp, 0, length);
             byte[] temp2 = new byte[count];
             Arrays.fill(temp2, (byte) count);
             if (Arrays.equals(temp, temp2)) {