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-            <path>
-              <item name="0.1" type="b2602c69:ProjectViewProjectNode" />
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-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="test" type="462c0819:PsiDirectoryNode" />
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-            <path>
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-              <item name="CryptoCoin" type="462c0819:PsiDirectoryNode" />
-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="test" type="462c0819:PsiDirectoryNode" />
-              <item name="java" type="462c0819:PsiDirectoryNode" />
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-            <path>
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-              <item name="src" type="462c0819:PsiDirectoryNode" />
-              <item name="test" type="462c0819:PsiDirectoryNode" />
               <item name="java" type="462c0819:PsiDirectoryNode" />
               <item name="buecoin01" type="462c0819:PsiDirectoryNode" />
+              <item name="utility" type="462c0819:PsiDirectoryNode" />
             </path>
           </expand>
           <select />
         </subPane>
       </pane>
-      <pane id="PackagesPane" />
       <pane id="Scope" />
+      <pane id="AndroidView" />
+      <pane id="PackagesPane" />
     </panes>
   </component>
-  <component name="PropertiesComponent">
-    <property name="RequestMappingsPanelOrder0" value="0" />
-    <property name="RequestMappingsPanelOrder1" value="1" />
-    <property name="RequestMappingsPanelWidth0" value="75" />
-    <property name="RequestMappingsPanelWidth1" value="75" />
-  </component>
   <component name="RunDashboard">
     <option name="ruleStates">
       <list>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="27000" />
+    <option name="totallyTimeSpent" value="220000" />
   </component>
   <component name="ToolWindowManager">
-    <frame x="0" y="0" width="1280" height="800" extended-state="0" />
-    <editor active="true" />
+    <frame x="0" y="23" width="1440" height="812" extended-state="6" />
     <layout>
       <window_info anchor="right" id="Palette" />
       <window_info anchor="bottom" id="Event Log" side_tool="true" />
       <window_info id="UI Designer" />
       <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
       <window_info anchor="bottom" id="TODO" order="6" />
-      <window_info anchor="bottom" id="Messages" weight="0.32905984" />
+      <window_info anchor="bottom" id="Messages" />
       <window_info anchor="right" id="Palette&#9;" />
       <window_info id="Image Layers" />
       <window_info anchor="bottom" id="Java Enterprise" />
       <window_info anchor="right" id="Capture Analysis" />
+      <window_info anchor="bottom" id="Run" order="2" weight="0.37062937" />
       <window_info anchor="bottom" id="Version Control" />
-      <window_info anchor="bottom" id="Run" order="2" weight="0.32905984" />
-      <window_info anchor="bottom" id="Terminal" />
-      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24959612" />
+      <window_info anchor="bottom" id="Spring" />
+      <window_info anchor="bottom" id="Terminal" visible="true" weight="0.32867134" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.24964234" />
+      <window_info anchor="right" id="Bean Validation" />
       <window_info id="Web" side_tool="true" />
       <window_info anchor="right" id="Theme Preview" />
       <window_info id="Favorites" side_tool="true" />
-      <window_info anchor="right" id="Bean Validation" />
       <window_info anchor="bottom" id="Find" order="1" />
       <window_info anchor="right" id="Commander" internal_type="SLIDING" order="0" type="SLIDING" weight="0.4" />
       <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
-      <window_info anchor="bottom" id="Spring" />
       <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
       <window_info anchor="bottom" id="Message" order="0" />
       <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
     <option name="myLimit" value="2678400000" />
   </component>
   <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/ProcessLoader.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="345">
+          <caret line="31" column="11" lean-forward="true" selection-start-line="31" selection-start-column="11" selection-end-line="31" selection-end-column="11" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Coin.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="75">
+          <caret line="5" column="19" lean-forward="true" selection-start-line="5" selection-start-column="19" selection-end-line="5" selection-end-column="19" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/Repositories/CoinRepository.java">
+      <provider selected="true" editor-type-id="text-editor">
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+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Block.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="567">
+          <caret line="50" selection-start-line="50" selection-end-line="50" />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="360">
-          <caret line="24" column="29" selection-start-line="24" selection-start-column="29" selection-end-line="24" selection-end-column="29" />
+        <state relative-caret-position="1695">
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+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="318">
+          <caret line="117" column="26" selection-start-line="117" selection-start-column="26" selection-end-line="117" selection-end-column="26" />
           <folding>
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-            <element signature="e#621#622#0" expanded="true" />
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+            <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/Repositories/CoinRepository.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionInput.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="45">
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+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/test/java/com/buecoin01/ApplicationTests.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionOutput.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="90">
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+        <state relative-caret-position="314">
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+          </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Block.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="1046">
-          <caret line="78" selection-start-line="78" selection-end-line="78" />
+        <state relative-caret-position="-26">
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+          <folding>
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+            <element signature="e#1724#1725#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Blockchain.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="347">
+          <caret line="34" selection-start-line="34" selection-end-line="34" />
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+            <element signature="imports" expanded="true" />
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+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/pom.xml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="990">
+          <caret line="66" column="19" selection-start-line="66" selection-start-column="19" selection-end-line="66" selection-end-column="19" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="870">
+          <caret line="133" column="30" selection-start-line="133" selection-start-column="30" selection-end-line="133" selection-end-column="30" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/Repositories/CoinRepository.java" />
+    <entry file="file://$PROJECT_DIR$/src/test/java/com/buecoin01/ApplicationTests.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="90">
+          <caret line="9" column="13" selection-start-line="9" selection-start-column="13" selection-end-line="9" selection-end-column="13" />
         </state>
       </provider>
     </entry>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Coin.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Coin.java" />
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/Application.java">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="75">
-          <caret line="5" column="13" selection-start-line="5" selection-start-column="13" selection-end-line="5" selection-end-column="13" />
+          <caret line="7" column="13" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
         </state>
       </provider>
     </entry>
     <entry file="file://$PROJECT_DIR$/.idea/workspace.xml">
-      <provider selected="true" editor-type-id="text-editor" />
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3616">
+          <caret line="752" column="7" selection-start-line="752" selection-start-column="7" selection-end-line="752" selection-end-column="7" />
+        </state>
+      </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/Application.java">
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Block.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="75">
-          <caret line="7" column="13" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
+        <state relative-caret-position="1200">
+          <caret line="94" column="5" lean-forward="true" selection-start-line="94" selection-start-column="5" selection-end-line="94" selection-end-column="5" />
         </state>
       </provider>
     </entry>

0.1.iml

     <orderEntry type="library" name="Maven: org.springframework:spring-jcl:5.0.7.RELEASE" level="project" />
     <orderEntry type="library" scope="TEST" name="Maven: org.springframework:spring-test:5.0.7.RELEASE" level="project" />
     <orderEntry type="library" scope="TEST" name="Maven: org.xmlunit:xmlunit-core:2.5.1" level="project" />
+    <orderEntry type="library" name="Maven: org.ow2.util.bundles:bouncycastle-java5-136:1.0.0" level="project" />
+    <orderEntry type="library" name="Maven: bouncycastle:bcprov-jdk15:136" level="project" />
   </component>
 </module>

pom.xml

 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+        <dependency>
+            <groupId>org.ow2.util.bundles</groupId>
+            <artifactId>bouncycastle-java5-136</artifactId>
+            <version>1.0.0</version>
+        </dependency>
 	</dependencies>
 
 	<build>

src/main/java/com/buecoin01/model/Block.java

 
 import javax.persistence.*;
 import java.time.LocalDateTime;
+import java.util.ArrayList;
 
 
 @Entity
     @Column
     private String hash;
     private String previousHash;
-    private String data;
+    //private String data;
+    public String merkleRoot;
+    public ArrayList<Transaction> transactions = new ArrayList<>();
     private LocalDateTime timeStamp;
     private int nonce;
 
 
     public Block(String previousHash, LocalDateTime time, int nonce) {
         this.timeStamp = time;
-        this.hash = previousHash;
-        this.nonce = nonce;
+        this.previousHash = previousHash;
+        this.hash = calculateHash();
     }
 
     public String getHash() {
         return previousHash;
     }
 
-    public String getData() {
-        return data;
-    }
+//    public String getData() {
+//        return data;
+//    }
 
     public LocalDateTime getTimeStamp() {
         return timeStamp;
                   previousHash +
                         timeStamp.toString() +
                         Integer.toString(nonce) +
-                        data);
+                        merkleRoot);
     }
 
     public long getId() {
         System.out.println("You have been awarded 1 Zip!");
     }
 
-
+    //add transactions to this block
+    public boolean addTransaction(Transaction transaction){
+        //process transaction and check if valid, unless block is genesis block then ignore
+        if (transaction == null) return false;
+        if (previousHash != "0"){
+            if (!(transaction.processTransaction())){
+                System.out.println("Transaction failed to process. Discarded.");
+                return false;
+            }
+        }
+        transactions.add(transaction);
+        System.out.println("Transaction Successfully added to the Block!");
+        return true;
+    }
 }

src/main/java/com/buecoin01/model/Blockchain.java

 
 import com.buecoin01.model.Block;
 import com.buecoin01.utility.Encryption;
+import com.buecoin01.utility.TransactionOutput;
 import com.google.gson.GsonBuilder;
 
-import java.util.ArrayList;
-import java.util.List;
+import java.security.Security;
+import java.util.*;
 
 public class Blockchain {
     private static List<Block> blockchain = new ArrayList<>();
+    private static Map<String, TransactionOutput> UTXOs = new HashMap<>();
+    public static float minimumTransaction = 0.1f;
     private static int difficulty = 5;
+    public static Wallet walletA;
+    public static Wallet walletB;
+    //public static Transaction genesisTransaction;
+
+    public static void main(String[] args) {
+        //Setup Bouncey castle as a Security Provider
+        Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
+
+        //Create the new wallets
+        walletA = new Wallet();
+        walletB = new Wallet();
+
+        //Test public and private keys
+        System.out.println("Private and public keys:");
+        System.out.println(Encryption.getStringFromKey(walletA.getPrivateKey()));
+        System.out.println(Encryption.getStringFromKey(walletA.getPublicKey()));
+        //Create a test transaction from WalletA to walletB
+        Transaction transaction = new Transaction(walletA.getPublicKey(), walletB.getPublicKey(), 5, null);
+        transaction.generateSignature(walletA.getPrivateKey());
+
+        //Verify the signature works and verify it from the public key
+        System.out.println("Is signature verified");
+        System.out.println(transaction.verifySignature());
+
+    }
 
     public String chainToJson() {
         return new GsonBuilder()
                 .toJson(blockchain);
     }
 
+    public static Map<String, TransactionOutput> getUTXOs() {
+        return UTXOs;
+    }
+
+    public static void setUTXOs(Map<String, TransactionOutput> UTXOs) {
+        Blockchain.UTXOs = UTXOs;
+    }
+
     public static List<Block> getBlockchain() {
         return blockchain;
     }

src/main/java/com/buecoin01/model/Transaction.java

+package com.buecoin01.model;
+
+import com.buecoin01.utility.Encryption;
+import com.buecoin01.utility.TransactionInput;
+import com.buecoin01.utility.TransactionOutput;
+
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Transaction {
+    private String transactionId; //hash of the transaction
+    private PublicKey sender;
+    private PublicKey reciepient;
+    private String senderName;
+    private String reciepientName;
+    private float value;
+    private byte[] signature;
+
+    private List<TransactionInput> inputs = new ArrayList<>();
+    private List<TransactionOutput> outputs = new ArrayList<>();
+
+    private static int sequence = 0; //how many transactions have been generated
+
+    public Transaction(PublicKey from, PublicKey to, float value, ArrayList<TransactionInput> inputs) {
+        this.sender = from;
+        this.reciepient = to;
+        this.value = value;
+        this.inputs = inputs;
+    }
+
+    //generating transactionId
+    private String calculateHash() {
+        sequence++; //increasing tho avoid identical hash codes
+        return Encryption.applySha256(
+                Encryption.getStringFromKey(sender) +
+                       Encryption.getStringFromKey(reciepient) +
+                       Float.toString(value) + sequence
+                       );
+    }
+
+    //Sign all the data that should not be tempered
+    public void generateSignature(PrivateKey privateKey) {
+        String data = Encryption.getStringFromKey(sender) + Encryption.getStringFromKey(reciepient) + Float.toString(value);
+        signature = Encryption.applyECDSASig(privateKey, data);
+    }
+
+    //Verify the data we signed hasn't been tampered with
+    public boolean verifySignature() {
+        String data = Encryption.getStringFromKey(sender) + Encryption.getStringFromKey(reciepient) + Float.toString(value);
+        return Encryption.verifyECDSASig(sender, data, signature);
+    }
+
+    //Check if transaction can be created
+    public boolean processTransaction() {
+        if (!verifySignature()) {
+            System.out.println("Transaction Signature failed to verify");
+            return false;
+        }
+
+        //gather transaction inputs to make sure they're unspent
+        for (TransactionInput i : inputs) {
+           i.setUTXO(Blockchain.getUTXOs().get(i.getTransactionOutputId()));
+
+        }
+        //check if transaction is valid
+        if(getInputsValue()< Blockchain.minimumTransaction){
+            System.out.println("Transaction Input to small: " + getInputsValue());
+            return false;
+        }
+        //add outputs to Unspent list
+        for (TransactionOutput o : outputs){
+            Blockchain.getUTXOs().put(o.getId(),o);
+        }
+        //remove transaction inputs from UXTO lists as spent
+        for(TransactionInput i :inputs){
+            if(i.getUTXO() == null) continue; // if Transaction cant be found, skip
+            Blockchain.getUTXOs().remove(i.getUTXO().getId());
+        }
+        return true;
+    }
+
+        // returns sum of inputs(UXTOs) values
+    public float getInputsValue(){
+        float total = 0;
+        for(TransactionInput i : inputs){
+            if(i.getUTXO() == null) continue; // if Transaction cant be found, skip
+            total= total + i.getUTXO().getValue();
+        }
+        return total;
+    }
+
+    public float getOutPutsValue(){
+        float total = 0;
+        for(TransactionOutput o : outputs){
+            total = total + o.getValue();
+        }
+        return total;
+    }
+    // tacks in array of transactions and returns a merkle root
+    public static  String getMerkleRoot(ArrayList<Transaction> transactions){
+        int count = transactions.size();
+        ArrayList<String> previousTreeLayer = new ArrayList<>();
+        for(Transaction transaction: transactions){
+            previousTreeLayer.add(transaction.transactionId);
+        }
+        ArrayList<String> treeLayer = previousTreeLayer;
+        while(count > 1){
+            treeLayer = new ArrayList<>();
+            for(int i = 1; i < previousTreeLayer.size();i++){
+             treeLayer.add(Encryption.applySha256(previousTreeLayer.get(i-1)) + previousTreeLayer.get(i));
+            }
+            count = treeLayer.size();
+            previousTreeLayer = treeLayer;
+        }
+        String merkleRoot = (treeLayer.size() == 1) ? treeLayer.get(0) : "";
+        return merkleRoot;
+    }
+}

src/main/java/com/buecoin01/model/Wallet.java

 package com.buecoin01.model;
 
+import com.buecoin01.utility.TransactionInput;
+import com.buecoin01.utility.TransactionOutput;
+
 import javax.persistence.*;
+import java.security.*;
+import java.security.spec.ECGenParameterSpec;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
 
 @Entity
 public class Wallet {
+
+    private PrivateKey privateKey;
+    private PublicKey publicKey;
+    public HashMap<String, TransactionOutput> UTXOs = new HashMap<>(); // only UTXOs owned by this wallet
     @Id
     @Column(name = "id")
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     }
 
     public Wallet() {
+        generateKeyPair();
+    }
+
+    public PrivateKey getPrivateKey() {
+        return privateKey;
+    }
 
+    public PublicKey getPublicKey() {
+        return publicKey;
     }
+
     public long getAmount() {
         return amount;
     }
     public void setId(long id) {
         this.id = id;
     }
+
+    public void generateKeyPair() {
+        try {
+            KeyPairGenerator keyGen = KeyPairGenerator.getInstance("ECDSA","BC");
+            SecureRandom random = SecureRandom.getInstance("SHA1PRNG");
+            ECGenParameterSpec ecSpec = new ECGenParameterSpec("prime192v1");
+
+            keyGen.initialize(ecSpec, random);
+            KeyPair keyPair = keyGen.generateKeyPair();
+            privateKey = keyPair.getPrivate();
+            publicKey = keyPair.getPublic();
+        } catch(Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+    //returns balance and store the UTXO's owned by this wallet in this.UXTOs
+    public float getBalance(){
+        float total = 0;
+        for (Map.Entry<String, TransactionOutput> item: Blockchain.getUTXOs().entrySet()){
+            TransactionOutput UTXO = item.getValue();
+            if (UTXO.isMine(publicKey)){ //if output belongs to me (if coins belong to me)
+                UTXOs.put(UTXO.getId(), UTXO);   // add it to our list of unspent transaction
+                total = total + UTXO.getValue();
+
+            }
+        }
+        return total;
+    }
+
+    //generates and returns a new transaction from this wallet
+
+
+    public Transaction sendFunds(PublicKey _recipient, float value){
+        if(getBalance() < value) {  //gather balance and check funds
+            System.out.println("Not Enough Funds. Transaction Discarded.");
+            return null;
+       }
+
+       // create arraylist of inputs
+        ArrayList<TransactionInput> inputs = new ArrayList<>();
+        float total = 0;
+        for(Map.Entry<String, TransactionOutput> item: UTXOs.entrySet()){
+            TransactionOutput UTXO = item.getValue();
+            total= total + UTXO.getValue();
+            inputs.add(new TransactionInput(UTXO.getId()));
+            if (total > value) break;
+        }
+        Transaction newTransaction = new Transaction(publicKey, _recipient,value, inputs);
+        newTransaction.generateSignature(privateKey);
+        for (TransactionInput input : inputs){
+            UTXOs.remove(input.getTransactionOutputId());
+        }
+        return newTransaction;
+    }
 }

src/main/java/com/buecoin01/utility/Encryption.java

 import com.google.common.hash.Hashing;
 
 import java.nio.charset.StandardCharsets;
+import java.security.Key;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.Signature;
+import java.util.Base64;
 
 public class Encryption {
     public static String applySha256(String input) {
     public static String createTarget(int difficulty) {
         return new String(new char[difficulty]).replace('\0', '0');
     }
+
+    //Apply ECDSA Signature and return result as bytes
+    public static byte[] applyECDSASig(PrivateKey privateKey, String input) {
+        Signature dsa;
+        byte[] realSig;
+        try {
+            dsa = Signature.getInstance("ECDSA","BC");
+            dsa.initSign(privateKey);
+            byte[] strByte = input.getBytes();
+            dsa.update(strByte);
+            realSig = dsa.sign();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        return realSig;
+    }
+
+    //Verify a String Signature
+    public static boolean verifyECDSASig(PublicKey publicKey, String data, byte[] signature) {
+        try {
+            Signature ecdsaVerify = Signature.getInstance("ECDSA", "BC");
+            ecdsaVerify.initVerify(publicKey);
+            ecdsaVerify.update(data.getBytes());
+            return  ecdsaVerify.verify(signature);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    //Return encoded string from a key
+    public static String getStringFromKey(Key key) {
+        return Base64.getEncoder().encodeToString(key.getEncoded());
+    }
 }

src/main/java/com/buecoin01/utility/TransactionInput.java

+package com.buecoin01.utility;
+
+
+//This class will be used to reference TransactionOutputs that have not yet been spent.
+//The transactionOutputId will be used to find the relevant TransactionOutput, allowing miners to check your ownership.
+public class TransactionInput {
+    private String transactionOutputId;
+   // private TransactionOutput UTXO; // UTXO means Unspent Transaction Outputs
+   private TransactionOutput UTXO;
+
+    public TransactionInput(String transactionOutputId) {
+        this.transactionOutputId = transactionOutputId;
+    }
+
+    public String getTransactionOutputId() {
+        return transactionOutputId;
+    }
+
+    public void setTransactionOutputId(String transactionOutputId) {
+        this.transactionOutputId = transactionOutputId;
+    }
+
+    public TransactionOutput getUTXO() {
+        return UTXO;
+    }
+
+    public void setUTXO(TransactionOutput UTXO) {
+        this.UTXO = UTXO;
+    }
+}

src/main/java/com/buecoin01/utility/TransactionOutput.java

+package com.buecoin01.utility;
+
+import java.security.PublicKey;
+
+public class TransactionOutput {
+    private String id;
+    private PublicKey reciepient; //new owner of the coins
+    private float value; //the amount of coins they own
+    private String parentTransactionId;
+
+    public TransactionOutput(PublicKey reciepient, float value, String parentTransactionId) {
+        this.reciepient = reciepient;
+        this.value = value;
+        this.parentTransactionId = parentTransactionId;
+        this.id = Encryption.applySha256(Encryption.getStringFromKey(reciepient)+Float.toString(value)+parentTransactionId);
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public PublicKey getReciepient() {
+        return reciepient;
+    }
+
+    public void setReciepient(PublicKey reciepient) {
+        this.reciepient = reciepient;
+    }
+
+    public float getValue() {
+        return value;
+    }
+
+    public void setValue(float value) {
+        this.value = value;
+    }
+
+    public String getParentTransactionId() {
+        return parentTransactionId;
+    }
+
+    public void setParentTransactionId(String parentTransactionId) {
+        this.parentTransactionId = parentTransactionId;
+    }
+
+    //Check if coin belongs to publicKey
+    public boolean isMine(PublicKey publicKey) {
+        return publicKey == reciepient;
+    }
+}