diff --git a/.idea/caches/build_file_checksums.ser b/.idea/caches/build_file_checksums.ser
index 51a6ee1..a5c77b9 100644
Binary files a/.idea/caches/build_file_checksums.ser and b/.idea/caches/build_file_checksums.ser differ
diff --git a/.idea/misc.xml b/.idea/misc.xml
index c0f68ed..99202cc 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -25,7 +25,7 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">
diff --git a/app/build.gradle b/app/build.gradle
index 8101683..62d2535 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -5,7 +5,7 @@ android {
     defaultConfig {
         applicationId "com.example.monnthic.monnthicmobile"
         multiDexEnabled true
-        minSdkVersion 19
+        minSdkVersion 26
         targetSdkVersion 26
         versionCode 1
         versionName "1.0"
@@ -32,5 +32,8 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     implementation 'org.web3j:core:3.3.1-android'
-    implementation 'com.j256.ormlite:ormlite-android:4.48'
+    implementation 'com.j256.ormlite:ormlite-core:5.1'
+    implementation 'com.j256.ormlite:ormlite-jdbc:5.1'
+    implementation group: 'org.postgresql', name: 'postgresql', version: '42.2.5'
+
 }
diff --git a/app/src/main/java/monnethic/mobile/blockchain/AccessBlockchain.java b/app/src/main/java/monnethic/mobile/blockchain/AccessBlockchain.java
index a77b9e0..1f9293d 100644
--- a/app/src/main/java/monnethic/mobile/blockchain/AccessBlockchain.java
+++ b/app/src/main/java/monnethic/mobile/blockchain/AccessBlockchain.java
@@ -4,14 +4,13 @@ import org.web3j.protocol.Web3j;
 import org.web3j.protocol.Web3jFactory;
 import org.web3j.protocol.core.methods.response.EthGetBalance;
 import org.web3j.protocol.core.methods.response.EthGetTransactionCount;
-import org.web3j.protocol.core.methods.request.Transaction;
 import org.web3j.protocol.http.HttpService;
 import org.web3j.protocol.core.DefaultBlockParameterName;
 import org.web3j.utils.Convert;
 
 import java.math.BigInteger;
 
-import monnethic.mobile.transaction.DbTransaction;
+import monnethic.mobile.transaction.Transaction;
 
 
 /**
@@ -115,7 +114,7 @@ public class AccessBlockchain {
         return null;
     }
 
-    //Send DbTransaction demo function
+    //Send Transaction demo function
     public static boolean sendTransationTo(String addressSource, String addressDestination, BigInteger amountToSend){
         Web3j n1 = Web3jFactory.build(new HttpService(node1));
         try{
@@ -126,7 +125,7 @@ public class AccessBlockchain {
             BigInteger gasLimit = gasPrice.multiply(BigInteger.valueOf(2));
 
             BigInteger amountEther = Convert.toWei(amountToSend.toString(), Convert.Unit.ETHER).toBigInteger();
-            Transaction transaction = Transaction.createEtherTransaction(coinbase, nonce, gasPrice, gasLimit, addressDestination, amountEther);
+            org.web3j.protocol.core.methods.request.Transaction transaction = org.web3j.protocol.core.methods.request.Transaction.createEtherTransaction(coinbase, nonce, gasPrice, gasLimit, addressDestination, amountEther);
             String txUnit = "ETHER";
 
             System.out.println("source : "+coinbase+"\nnonce : "+nonce+"\ngasPrice : "+gasPrice);
@@ -153,6 +152,6 @@ public class AccessBlockchain {
 
     private void insertTransaction(String adS, String adD, BigInteger amTs, String txH, String blN, String txUnit){
 
-        DbTransaction dbTrs = new DbTransaction();
+        Transaction dbTrs = new Transaction();
     }
 }
diff --git a/app/src/main/java/monnethic/mobile/database/DatabaseHelper.java b/app/src/main/java/monnethic/mobile/database/DatabaseHelper.java
new file mode 100644
index 0000000..799e976
--- /dev/null
+++ b/app/src/main/java/monnethic/mobile/database/DatabaseHelper.java
@@ -0,0 +1,39 @@
+package monnethic.mobile.database;
+
+import android.util.Log;
+
+import monnethic.mobile.transaction.Transaction;
+import monnethic.mobile.user.User;
+
+import com.j256.ormlite.dao.Dao;
+import com.j256.ormlite.dao.DaoManager;
+import com.j256.ormlite.jdbc.JdbcConnectionSource;
+import com.j256.ormlite.support.ConnectionSource;
+
+public class DatabaseHelper {
+    private static final String DATABASE_NAME = "monnethic";
+    private static final String DATABASE_USER = "";
+    private static final String DATABASE_PWD = "";
+    private final static String DATABASE_URL = "jdbc:postgresql://37.187.101.44:5432/"+DATABASE_NAME;
+
+
+    public ConnectionSource setupDatabaseConnection(){
+        try{
+            return new JdbcConnectionSource(DATABASE_URL, DATABASE_USER, DATABASE_PWD);
+        }catch (Exception e){
+            System.out.print("\n"+e.getMessage());
+            return null;
+        }
+    }
+
+    /*
+    public void insertTransaction(Transaction tx){
+        try{
+            //Dao<Transaction, Integer> dao = getDao(Transaction.class);
+            //dao.create(tx);
+        } catch(Exception exception){
+            Log.e("DATABASE","Can't insert Transaction into Database", exception);
+        }
+    }
+    */
+}
diff --git a/app/src/main/java/monnethic/mobile/database/DatabaseManager.java b/app/src/main/java/monnethic/mobile/database/DatabaseManager.java
deleted file mode 100644
index 03d81a4..0000000
--- a/app/src/main/java/monnethic/mobile/database/DatabaseManager.java
+++ /dev/null
@@ -1,53 +0,0 @@
-package monnethic.mobile.database;
-
-
-import android.content.Context;
-import android.database.sqlite.SQLiteDatabase;
-import android.util.Log;
-
-import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
-import com.j256.ormlite.dao.Dao;
-import com.j256.ormlite.support.ConnectionSource;
-import com.j256.ormlite.table.TableUtils;
-
-import monnethic.mobile.transaction.DbTransaction;
-
-public class DatabaseManager extends OrmLiteSqliteOpenHelper{
-    private static final String DATABASE_NAME = "WalletTransaction.db";
-    private static final int DATABASE_VERSION = 1;
-
-    public DatabaseManager(Context context){
-        super(context, DATABASE_NAME, null, DATABASE_VERSION);
-    }
-
-    @Override
-    public void onCreate(SQLiteDatabase database, ConnectionSource connectionSource) {
-        try{
-            TableUtils.clearTable(connectionSource, DbTransaction.class);
-            Log.i("DATABASE","onCreate invoked");
-        }catch(Exception exception){
-            Log.e("DATABASE","Can't create Database", exception);
-        }
-
-    }
-
-    @Override
-    public void onUpgrade(SQLiteDatabase database, ConnectionSource connectionSource, int oldVersion, int newVersion) {
-        try{
-            TableUtils.dropTable(connectionSource, DbTransaction.class, true);
-            onCreate(database, connectionSource);
-            Log.i("DATABASE","onUpdate invoked");
-        }catch(Exception exception){
-            Log.e("DATABASE","Can't update Database", exception);
-        }
-    }
-
-    public void insertTransaction(DbTransaction tx){
-        try{
-            Dao<DbTransaction, Integer> dao = getDao(DbTransaction.class);
-            dao.create(tx);
-        } catch(Exception exception){
-            Log.e("DATABASE","Can't insert DbTransaction into Database", exception);
-        }
-    }
-}
diff --git a/app/src/main/java/monnethic/mobile/database/DatabaseTest.java b/app/src/main/java/monnethic/mobile/database/DatabaseTest.java
new file mode 100644
index 0000000..1157960
--- /dev/null
+++ b/app/src/main/java/monnethic/mobile/database/DatabaseTest.java
@@ -0,0 +1,40 @@
+package monnethic.mobile.database;
+
+import com.j256.ormlite.field.DatabaseField;
+import com.j256.ormlite.table.DatabaseTable;
+
+@DatabaseTable(tableName = "T_TEST")
+public class DatabaseTest {
+    public static final String NAME_FIELD_NAME = "name";
+    public static final String ID_FIELD_NAME = "id";
+
+    @DatabaseField(columnName = ID_FIELD_NAME, id = true)
+    private int id;
+    @DatabaseField(columnName = NAME_FIELD_NAME, canBeNull = false)
+    private String name;
+
+    public DatabaseTest(int id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public DatabaseTest() {
+
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/app/src/main/java/monnethic/mobile/transaction/DbTransaction.java b/app/src/main/java/monnethic/mobile/transaction/Transaction.java
similarity index 91%
rename from app/src/main/java/monnethic/mobile/transaction/DbTransaction.java
rename to app/src/main/java/monnethic/mobile/transaction/Transaction.java
index 3fc7dc2..f2f4dea 100644
--- a/app/src/main/java/monnethic/mobile/transaction/DbTransaction.java
+++ b/app/src/main/java/monnethic/mobile/transaction/Transaction.java
@@ -7,7 +7,7 @@ import java.math.BigInteger;
 import java.util.Date;
 
 @DatabaseTable(tableName = "T_TRANSACTION")
-public class DbTransaction {
+public class Transaction {
     @DatabaseField(columnName = "transactionId", generatedId = true, unique = true)
     private int id;
     @DatabaseField(columnName = "transactionDate")
@@ -25,11 +25,11 @@ public class DbTransaction {
     @DatabaseField(columnName = "transactionUnit")
     private String unit;
 
-    public DbTransaction() {
+    public Transaction() {
         super();
     }
 
-    public DbTransaction(Date transactionDate, String sourceAddress, String destAddress, String transactionHash, String blockNumber, BigInteger amount, String unit) {
+    public Transaction(Date transactionDate, String sourceAddress, String destAddress, String transactionHash, String blockNumber, BigInteger amount, String unit) {
         super();
         this.transactionDate = transactionDate;
         this.sourceAddress = sourceAddress;
diff --git a/app/src/main/java/monnethic/mobile/user/User.java b/app/src/main/java/monnethic/mobile/user/User.java
index 5e60f27..027e339 100644
--- a/app/src/main/java/monnethic/mobile/user/User.java
+++ b/app/src/main/java/monnethic/mobile/user/User.java
@@ -1,51 +1,21 @@
 package monnethic.mobile.user;
 
+import java.util.Date;
+
 /**
  * Created by Guillaume on 15/04/2018.
  */
 
+
 public class User {
+    private int userId;
     private String name;
     private String firstname;
     private String email;
     private String password;
+    private Date creationDate;
+    private Date modificationDate;
+    private boolean verified;
+    private boolean approved;
 
-    public User(String name, String firstname, String email, String password) {
-        this.name = name;
-        this.firstname = firstname;
-        this.email = email;
-        this.password = password;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public String getFirstname() {
-        return firstname;
-    }
-
-    public void setFirstname(String firstname) {
-        this.firstname = firstname;
-    }
-
-    public String getEmail() {
-        return email;
-    }
-
-    public void setEmail(String email) {
-        this.email = email;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public void setPassword(String password) {
-        this.password = password;
-    }
 }
diff --git a/app/src/test/java/monnethic/mobile/test/database/DatabaseHelperTest.java b/app/src/test/java/monnethic/mobile/test/database/DatabaseHelperTest.java
new file mode 100644
index 0000000..cc60b28
--- /dev/null
+++ b/app/src/test/java/monnethic/mobile/test/database/DatabaseHelperTest.java
@@ -0,0 +1,27 @@
+package monnethic.mobile.test.database;
+
+import com.j256.ormlite.dao.Dao;
+import com.j256.ormlite.dao.DaoManager;
+import org.junit.Test;
+import monnethic.mobile.database.DatabaseHelper;
+import monnethic.mobile.database.DatabaseTest;
+
+
+//Testing class for postgresql connection
+public class DatabaseHelperTest {
+    private DatabaseHelper dbh = new DatabaseHelper();
+
+    //Test connection by getting existing data in T_TEST
+    @Test
+    public void TestConnection(){
+        Dao<DatabaseTest, Integer> testDao;
+        try{
+            testDao = DaoManager.createDao(dbh.setupDatabaseConnection(),DatabaseTest.class);
+            DatabaseTest dbt = testDao.queryForId(1);
+            assert dbt != null;
+            assert "thomas".equals(dbt.getName());
+        }catch (Exception e){
+            System.out.println("\n"+e.getMessage());
+        }
+    }
+}