diff --git a/src/main/java/jota/error/ArgumentException.java b/src/main/java/jota/error/ArgumentException.java
new file mode 100644
index 0000000..759b694
--- /dev/null
+++ b/src/main/java/jota/error/ArgumentException.java
@@ -0,0 +1,10 @@
+package jota.error;
+
+/**
+ * Created by Adrian on 09.12.2016.
+ */
+public class ArgumentException extends BaseException {
+    public ArgumentException() {
+        super("wrong arguments passed to function");
+    }
+}
diff --git a/src/main/java/jota/error/BaseException.java b/src/main/java/jota/error/BaseException.java
new file mode 100644
index 0000000..b1eb210
--- /dev/null
+++ b/src/main/java/jota/error/BaseException.java
@@ -0,0 +1,51 @@
+package jota.error;
+
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.Collection;
+
+/**
+ * Created by Adrian on 09.12.2016.
+ */
+public class BaseException extends Exception {
+    protected Collection<String> messages;
+
+    public BaseException(String msg) {
+        super(msg);
+    }
+
+
+    public BaseException(String msg, Exception cause) {
+        super(msg, cause);
+    }
+
+
+    public BaseException(Collection<String> messages) {
+        super();
+        this.messages = messages;
+    }
+
+
+    public BaseException(Collection<String> messages, Exception cause) {
+        super(cause);
+        this.messages = messages;
+    }
+
+    @Override
+    public String getMessage() {
+        String msg;
+
+        if (this.messages != null && !this.messages.isEmpty()) {
+            msg = "[";
+
+            for (String message : this.messages) {
+                msg += message + ",";
+            }
+
+            msg = StringUtils.removeEnd(msg, ",") + "]";
+
+        } else msg = super.getMessage();
+
+        return msg;
+    }
+}
diff --git a/src/main/java/jota/error/NotEnoughBalanceException.java b/src/main/java/jota/error/NotEnoughBalanceException.java
new file mode 100644
index 0000000..c7099d6
--- /dev/null
+++ b/src/main/java/jota/error/NotEnoughBalanceException.java
@@ -0,0 +1,10 @@
+package jota.error;
+
+/**
+ * Created by Adrian on 09.12.2016.
+ */
+public class NotEnoughBalanceException extends BaseException {
+    public NotEnoughBalanceException() {
+        super("not enough balance dude");
+    }
+}
diff --git a/src/main/java/jota/model/Transaction.java b/src/main/java/jota/model/Transaction.java
index 4cf5e89..8a74f5a 100644
--- a/src/main/java/jota/model/Transaction.java
+++ b/src/main/java/jota/model/Transaction.java
@@ -7,36 +7,38 @@ import org.apache.commons.lang3.builder.ToStringStyle;
  * Created by pinpong on 02.12.16.
  */
 public class Transaction {
-
-    private String signatureMessageChunk;
-    private String index;
-    private String approvalNonce;
     private String hash;
-    private String digest;
-    private String type;
-    private String timestamp;
-    private String trunkTransaction;
-    private String branchTransaction;
-    private String signatureNonce;
+    private String signatureFragments;
     private String address;
     private String value;
+    private String tag;
+    private String timestamp;
+    private String currentIndex;
+    private String lastIndex;
     private String bundle;
+    private String trunkTransaction;
+    private String branchTransaction;
+    private String nonce;
+    private Boolean persistence;
 
-    public Transaction(String signatureMessageChunk, String index, String approvalNonce, String hash, String digest, String type, String timestamp, String trunkTransaction, String branchTransaction, String signatureNonce, String address, String value, String bundle) {
+    public Transaction() {
+
+    }
+
+    public Transaction(String signatureFragments, String currentIndex, String lastIndex, String nonce, String hash, String tag, String timestamp, String trunkTransaction, String branchTransaction, String address, String value, String bundle) {
 
         this.hash = hash;
-        this.type = type;
-        this.signatureMessageChunk = signatureMessageChunk;
-        this.digest = digest;
+        this.tag = tag;
+        this.signatureFragments = signatureFragments;
         this.address = address;
         this.value = value;
         this.timestamp = timestamp;
-        this.index = index;
+        this.currentIndex = currentIndex;
+        this.lastIndex = lastIndex;
         this.bundle = bundle;
-        this.signatureNonce = signatureNonce;
-        this.approvalNonce = approvalNonce;
         this.trunkTransaction = trunkTransaction;
         this.branchTransaction = branchTransaction;
+        this.nonce = nonce;
     }
 
     @Override
@@ -44,56 +46,107 @@ public class Transaction {
         return ToStringBuilder.reflectionToString(this, ToStringStyle.MULTI_LINE_STYLE);
     }
 
-    public String getValue() {
-        return value;
+    public String getHash() {
+        return hash;
     }
 
-    public String getDigest() {
-        return digest;
+    public void setHash(String hash) {
+        this.hash = hash;
     }
 
-    public String getTrunkTransaction() {
-        return trunkTransaction;
+    public String getSignatureFragments() {
+        return signatureFragments;
     }
 
-    public String getTimestamp() {
-        return timestamp;
-    }
-
-    public String getSignatureNonce() {
-        return signatureNonce;
-    }
-
-    public String getType() {
-        return type;
+    public String setSignatureFragments(String signatureFragments) {
+        return this.signatureFragments = signatureFragments;
     }
 
     public String getAddress() {
         return address;
     }
 
-    public String getApprovalNonce() {
-        return approvalNonce;
+    public void setAddress(String address) {
+        this.address = address;
     }
 
-    public String getBranchTransaction() {
-        return branchTransaction;
+    public String getValue() {
+        return value;
+    }
+
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+    public String getTag() {
+        return tag;
+    }
+
+    public void setTag(String tag) {
+        this.tag = tag;
+    }
+
+    public String getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(String timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    public String getCurrentIndex() {
+        return currentIndex;
+    }
+
+    public String setCurrentIndex(String currentIndex) {
+        return this.currentIndex = currentIndex;
+    }
+
+    public String getLastIndex() {
+        return lastIndex;
+    }
+
+    public String setLastIndex(String lastIndex) {
+        return this.lastIndex = lastIndex;
     }
 
     public String getBundle() {
         return bundle;
     }
 
-    public String getHash() {
-        return hash;
+    public void setBundle(String bundle) {
+        this.bundle = bundle;
     }
 
-    public String getIndex() {
-        return index;
+    public String getTrunkTransaction() {
+        return trunkTransaction;
     }
 
-    public String getSignatureMessageChunk() {
-        return signatureMessageChunk;
+    public void setTrunkTransaction(String trunkTransaction) {
+        this.trunkTransaction = trunkTransaction;
     }
 
-}
+    public String getBranchTransaction() {
+        return branchTransaction;
+    }
+
+    public void setBranchTransaction(String branchTransaction) {
+        this.branchTransaction = branchTransaction;
+    }
+
+    public String getNonce() {
+        return nonce;
+    }
+
+    public void setNonce(String nonce) {
+        this.nonce = nonce;
+    }
+
+    public Boolean getPersistence() {
+        return persistence;
+    }
+
+    public void setPersistence(Boolean persistence) {
+        this.persistence = persistence;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/jota/utils/Checksum.java b/src/main/java/jota/utils/Checksum.java
index fe22f5a..6bf83f5 100644
--- a/src/main/java/jota/utils/Checksum.java
+++ b/src/main/java/jota/utils/Checksum.java
@@ -24,7 +24,7 @@ public class Checksum {
     }
 
     private static String getAddress(String addressWithChecksum) {
-        return addressWithChecksum.substring(0, Constants.addressLengthWithoutChecksum);
+        return addressWithChecksum.substring(0, Constants.ADDRESS_LENGTH_WITHOUT_CHECKSUM);
     }
 
     public static boolean isValidChecksum(String addressWithChecksum) {
@@ -34,7 +34,7 @@ public class Checksum {
     }
 
     private static boolean isAddressWithChecksum(String addressWithChecksum) {
-        return InputValidator.checkAddress(addressWithChecksum) && addressWithChecksum.length() == Constants.addressLengthWithChecksum;
+        return InputValidator.checkAddress(addressWithChecksum) && addressWithChecksum.length() == Constants.ADDRESS_LENGTH_WITH_CHECKSUM;
     }
 
     public static String calculateChecksum(String address) {
diff --git a/src/main/java/jota/utils/Constants.java b/src/main/java/jota/utils/Constants.java
index 997b296..2b9d4a5 100644
--- a/src/main/java/jota/utils/Constants.java
+++ b/src/main/java/jota/utils/Constants.java
@@ -7,7 +7,9 @@ public class Constants {
 
     public static final String TRYTE_ALPHABET = "9ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
-    public static int addressLengthWithoutChecksum = 81;
-    public static int addressLengthWithChecksum = 90;
+    public static final int SEED_LENGTH_MAX = 81;
+
+    public static int ADDRESS_LENGTH_WITHOUT_CHECKSUM = 81;
+    public static int ADDRESS_LENGTH_WITH_CHECKSUM = 90;
 
 }
diff --git a/src/main/java/jota/utils/Converter.java b/src/main/java/jota/utils/Converter.java
index a43388f..0a94107 100644
--- a/src/main/java/jota/utils/Converter.java
+++ b/src/main/java/jota/utils/Converter.java
@@ -1,16 +1,19 @@
 package jota.utils;
 
+import jota.model.Transaction;
+import jota.pow.Curl;
+
 import java.util.Arrays;
 
 public class Converter {
 
-    public static final int RADIX = 3;
-    public static final int MAX_TRIT_VALUE = (RADIX - 1) / 2, MIN_TRIT_VALUE = -MAX_TRIT_VALUE;
+    private static final int RADIX = 3;
+    private static final int MAX_TRIT_VALUE = (RADIX - 1) / 2, MIN_TRIT_VALUE = -MAX_TRIT_VALUE;
 
-    public static final int NUMBER_OF_TRITS_IN_A_BYTE = 5;
-    public static final int NUMBER_OF_TRITS_IN_A_TRYTE = 3;
-    static final int[][] BYTE_TO_TRITS_MAPPINGS = new int[243][];
-    static final int[][] TRYTE_TO_TRITS_MAPPINGS = new int[27][];
+    private static final int NUMBER_OF_TRITS_IN_A_BYTE = 5;
+    private static final int NUMBER_OF_TRITS_IN_A_TRYTE = 3;
+    private static final int[][] BYTE_TO_TRITS_MAPPINGS = new int[243][];
+    private static final int[][] TRYTE_TO_TRITS_MAPPINGS = new int[27][];
 
     static {
 
@@ -94,7 +97,7 @@ public class Converter {
     public static int[] copyTrits(final String input, final int[] destination) {
         for (int i = 0; i < input.length(); i++) {
             int index = Constants.TRYTE_ALPHABET.indexOf(input.charAt(i));
-            destination[i * 3] = TRYTE_TO_TRITS_MAPPINGS [index][0];
+            destination[i * 3] = TRYTE_TO_TRITS_MAPPINGS[index][0];
             destination[i * 3 + 1] = TRYTE_TO_TRITS_MAPPINGS[index][1];
             destination[i * 3 + 2] = TRYTE_TO_TRITS_MAPPINGS[index][2];
         }
@@ -124,6 +127,15 @@ public class Converter {
         return trits[offset] + trits[offset + 1] * 3 + trits[offset + 2] * 9;
     }
 
+    public static int value(final int[] trits) {
+        int value = 0;
+
+        for (int i = trits.length; i-- > 0; ) {
+            value = value * 3 + trits[i];
+        }
+        return value;
+    }
+
     public static void increment(final int[] trits, final int size) {
 
         for (int i = 0; i < size; i++) {
@@ -134,4 +146,41 @@ public class Converter {
             }
         }
     }
+
+    public static Transaction transactionObject(String trytes) {
+        if (trytes == null) return null;
+
+        // validity check
+        for (int i = 2279; i < 2295; i++) {
+            if (trytes.charAt(i) != '9') {
+                return null;
+            }
+        }
+        int[] transactionTrits = Converter.trits(trytes);
+        int[] hash = new int[90];
+
+        Curl curl = new Curl();
+
+        // generate the correct transaction hash
+        curl.reset();
+        curl.absorb(transactionTrits, 0, transactionTrits.length);
+        curl.squeeze(hash, 0, hash.length);
+
+        Transaction trx = new Transaction();
+
+        trx.setHash(Converter.trytes(hash));
+        trx.setSignatureFragments(trytes.substring(0, 2187));
+        trx.setAddress(trytes.substring(2187, 2268));
+        trx.setValue("" + Converter.value(Arrays.copyOfRange(transactionTrits, 6804, 6837)));
+        trx.setTag(trytes.substring(2295, 2322));
+        trx.setTimestamp("" + Converter.value(Arrays.copyOfRange(transactionTrits, 6966, 6993)));
+        trx.setCurrentIndex("" + Converter.value(Arrays.copyOfRange(transactionTrits, 6993, 7020)));
+        trx.setLastIndex("" + Converter.value(Arrays.copyOfRange(transactionTrits, 7020, 7047)));
+        trx.setBundle(trytes.substring(2349, 2430));
+        trx.setTrunkTransaction(trytes.substring(2430, 2511));
+        trx.setBranchTransaction(trytes.substring(2511, 2592));
+        trx.setNonce(trytes.substring(2592, 2673));
+
+        return trx;
+    }
 }
\ No newline at end of file
diff --git a/src/main/java/jota/utils/InputValidator.java b/src/main/java/jota/utils/InputValidator.java
index c1ddd2a..d658bd3 100644
--- a/src/main/java/jota/utils/InputValidator.java
+++ b/src/main/java/jota/utils/InputValidator.java
@@ -6,8 +6,8 @@ package jota.utils;
 public class InputValidator {
 
     public static boolean isAddress(String address) {
-        return (address.length() == Constants.addressLengthWithoutChecksum ||
-                address.length() == Constants.addressLengthWithChecksum) && isTrytes(address, address.length());
+        return (address.length() == Constants.ADDRESS_LENGTH_WITHOUT_CHECKSUM ||
+                address.length() == Constants.ADDRESS_LENGTH_WITH_CHECKSUM) && isTrytes(address, address.length());
     }
 
     public static boolean checkAddress(String address) {
@@ -20,4 +20,22 @@ public class InputValidator {
     public static boolean isTrytes(final String trytes, final int length) {
         return trytes.matches("^[A-Z9]{" + (length == 0 ? "0," : length) + "}$");
     }
+
+    public static boolean isArrayOfHashes(String[] hashes) {
+        if (hashes == null) return false;
+
+        for (String hash : hashes) {
+            // Check if address with checksum
+            if (hash.length() == 90) {
+                if (!isTrytes(hash, 90)) {
+                    return false;
+                }
+            } else {
+                if (!isTrytes(hash, 81)) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
 }
diff --git a/src/main/java/jota/utils/IotaUnitConverter.java b/src/main/java/jota/utils/IotaUnitConverter.java
index 57271e8..cdd4529 100644
--- a/src/main/java/jota/utils/IotaUnitConverter.java
+++ b/src/main/java/jota/utils/IotaUnitConverter.java
@@ -1,7 +1,9 @@
 package jota.utils;
 
+import java.text.DecimalFormat;
+
 /**
- * Created by pinpong on 30.11.16.
+ * Created by Sascha on 30.11.16.
  */
 public class IotaUnitConverter {
 
@@ -13,4 +15,53 @@ public class IotaUnitConverter {
     private static long convertUnits(long amount, IotaUnits toUnit) {
         return (long) (amount / Math.pow(10, toUnit.getValue()));
     }
+
+    public static String convertRawIotaAmountToDisplayText(long amount) {
+        IotaUnits unit = findOptimalIotaUnitToDisplay(amount);
+        double amountInDisplayUnit = convertAmountTo(amount, unit);
+        return createAmountWithUnitDisplayText(amountInDisplayUnit, unit);
+    }
+
+    public static double convertAmountTo(long amount, IotaUnits target) {
+        return amount / Math.pow(10, target.getValue());
+    }
+
+    private static String createAmountWithUnitDisplayText(double amountInUnit, IotaUnits unit) {
+        String result = createAmountDisplayText(amountInUnit, unit);
+        result += " " + unit.getUnit();
+        return result;
+    }
+
+    public static String createAmountDisplayText(double amountInUnit, IotaUnits unit) {
+        DecimalFormat df = new DecimalFormat("##0.##################");
+        String result = "";
+        // display unit as integer if value is between 1-999 or in decimal format
+        result += unit == IotaUnits.IOTA ? (long) amountInUnit : df.format(amountInUnit);
+        return result;
+    }
+
+    public static IotaUnits findOptimalIotaUnitToDisplay(long amount) {
+        int length = String.valueOf(amount).length();
+
+        if (amount < 0) // do not count "-" sign
+            length -= 1;
+
+        IotaUnits units = IotaUnits.IOTA;
+
+        if (length >= 1 && length <= 3) {
+            units = IotaUnits.IOTA;
+        } else if (length > 3 && length <= 6) {
+            units = IotaUnits.KILO_IOTA;
+        } else if (length > 6 && length <= 9) {
+            units = IotaUnits.MEGA_IOTA;
+        } else if (length > 9 && length <= 12) {
+            units = IotaUnits.GIGA_IOTA;
+        } else if (length > 12 && length <= 15) {
+            units = IotaUnits.TERA_IOTA;
+        } else if (length > 15 && length <= 18) {
+            units = IotaUnits.PETA_IOTA;
+        }
+        return units;
+    }
+
 }
diff --git a/src/main/java/jota/utils/SeedRandomGenerator.java b/src/main/java/jota/utils/SeedRandomGenerator.java
new file mode 100644
index 0000000..8e702cb
--- /dev/null
+++ b/src/main/java/jota/utils/SeedRandomGenerator.java
@@ -0,0 +1,20 @@
+package jota.utils;
+
+import java.util.Random;
+
+/**
+ * Created by pinpong on 13.12.16.
+ */
+public class SeedRandomGenerator {
+
+    public static String generateNewSeed() {
+        char[] chars = Constants.TRYTE_ALPHABET.toCharArray();
+        StringBuilder builder = new StringBuilder();
+        Random random = new Random();
+        for (int i = 0; i < Constants.SEED_LENGTH_MAX; i++) {
+            char c = chars[random.nextInt(chars.length)];
+            builder.append(c);
+        }
+        return builder.toString();
+    }
+}
diff --git a/src/main/java/jota/utils/TrytesConverter.java b/src/main/java/jota/utils/TrytesConverter.java
index 21f560e..5c5d843 100644
--- a/src/main/java/jota/utils/TrytesConverter.java
+++ b/src/main/java/jota/utils/TrytesConverter.java
@@ -70,7 +70,7 @@ public class TrytesConverter {
 
     public static String toString(String inputTrytes) {
 
-        String string = "";
+        StringBuilder string = new StringBuilder();
 
         for (int i = 0; i < inputTrytes.length(); i += 2) {
             // get a trytes pair
@@ -82,9 +82,9 @@ public class TrytesConverter {
 
             String character = Character.toString((char) decimalValue);
 
-            string += character;
+            string.append(character);
         }
 
-        return string;
+        return string.toString();
     }
-}
+}
\ No newline at end of file
diff --git a/src/test/java/jota/IotaUnitConverterTest.java b/src/test/java/jota/IotaUnitConverterTest.java
index 5078ac5..81da852 100644
--- a/src/test/java/jota/IotaUnitConverterTest.java
+++ b/src/test/java/jota/IotaUnitConverterTest.java
@@ -35,4 +35,24 @@ public class IotaUnitConverterTest {
     public void shouldConvertUnitTiToPi() {
         assertEquals(IotaUnitConverter.convertUnits(1000, IotaUnits.TERA_IOTA, IotaUnits.PETA_IOTA), 1);
     }
+
+    @Test
+    public void shouldFindOptimizeUnitToDisplay() {
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1), IotaUnits.IOTA);
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1000), IotaUnits.KILO_IOTA);
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1000000), IotaUnits.MEGA_IOTA);
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1000000000), IotaUnits.GIGA_IOTA);
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1000000000000L), IotaUnits.TERA_IOTA);
+        assertEquals(IotaUnitConverter.findOptimalIotaUnitToDisplay(1000000000000000L), IotaUnits.PETA_IOTA);
+    }
+
+    @Test
+    public void shouldConvertRawIotaAmountToDisplayText() {
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1), "1 i");
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1000), "1 Ki");
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1000000), "1 Mi"  );
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1000000000), "1 Gi" );
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1000000000000L), "1 Ti");
+        assertEquals(IotaUnitConverter.convertRawIotaAmountToDisplayText(1000000000000000L), "1 Pi");
+    }
 }
diff --git a/src/test/java/jota/SeedRandomGeneratorTest.java b/src/test/java/jota/SeedRandomGeneratorTest.java
new file mode 100644
index 0000000..b2ab6d2
--- /dev/null
+++ b/src/test/java/jota/SeedRandomGeneratorTest.java
@@ -0,0 +1,22 @@
+package jota;
+
+import jota.utils.Constants;
+import jota.utils.InputValidator;
+import jota.utils.SeedRandomGenerator;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Created by pinpong on 13.12.16.
+ */
+public class SeedRandomGeneratorTest {
+
+    @Test
+    public void shouldGenerateNewSeed() {
+
+        String generatedSeed = SeedRandomGenerator.generateNewSeed();
+        assertEquals(InputValidator.isAddress(generatedSeed), true);
+        assertEquals(generatedSeed.length(), Constants.SEED_LENGTH_MAX);
+    }
+}