diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
index 248b9fc..0902f40 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Action.java
@@ -1,4 +1,32 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
+import cz.cvut.fel.sit.omo.foodchain.node.INode;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
 public class Action extends OperationBase {
+
+    private final IOperation lastOperation;
+    private final Product product;
+    private final ProductOperationType type;
+
+    Action(INode node, Product product) {
+        super(node);
+        this.product = product;
+        type = null;
+        lastOperation = product.getCurrentOperation();
+        product.setCurrentOperation(this);
+        product.setStateToReadyForDispatch();
+    }
+
+    public IOperation getLastOperation() {
+        return lastOperation;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public ProductOperationType getType() {
+        return type;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
index 2f1a40a..e0113d0 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/FinancialTransaction.java
@@ -1,4 +1,24 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
+import cz.cvut.fel.sit.omo.foodchain.node.INode;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
 public class FinancialTransaction extends Transaction {
+
+    private final Float amount;
+    private final ProductTransaction transactionPaid;
+
+    FinancialTransaction(INode creator, INode receiver, TransactionType type, Float amount, ProductTransaction transactionPaid) {
+        super(creator, receiver, type);
+        this.amount = amount;
+        this.transactionPaid = transactionPaid;
+    }
+
+    public Float getAmount() {
+        return amount;
+    }
+
+    public ProductTransaction getTransactionPaid() {
+        return transactionPaid;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/OperationBase.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/OperationBase.java
index 6e9403b..b6bbbca 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/OperationBase.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/OperationBase.java
@@ -1,5 +1,35 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
+import cz.cvut.fel.sit.omo.foodchain.node.INode;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
+import java.time.LocalDateTime;
+
 public class OperationBase {
-    IOperation lastOperation;
+
+    private final LocalDateTime timeStart;
+    private LocalDateTime timeEnd;
+
+    private final INode nodeCreator;
+
+    OperationBase(INode node) {
+        nodeCreator = node;
+        timeStart = LocalDateTime.now();
+    }
+
+    public LocalDateTime getTimeStart() {
+        return timeStart;
+    }
+
+    public LocalDateTime getTimeEnd() {
+        return timeEnd;
+    }
+
+    public void setTimeEnd(LocalDateTime timeEnd) {
+        this.timeEnd = timeEnd;
+    }
+
+    public INode getNodeCreator() {
+        return nodeCreator;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductTransaction.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductTransaction.java
index a062539..c3d6994 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductTransaction.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/ProductTransaction.java
@@ -1,4 +1,32 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
+import cz.cvut.fel.sit.omo.foodchain.node.INode;
+import cz.cvut.fel.sit.omo.foodchain.product.Product;
+
 public class ProductTransaction extends Transaction {
+
+    private final IOperation lastOperation;
+    private final Product product;
+    private final ProductOperationType type;
+
+    ProductTransaction(INode creator, INode receiver, TransactionType transactionType, Product product) {
+        super(creator, receiver, transactionType);
+        this.product = product;
+        type = null;
+        lastOperation = product.getCurrentOperation();
+        product.setCurrentOperation(this);
+        product.setStateToReadyForDispatch();
+    }
+
+    public IOperation getLastOperation() {
+        return lastOperation;
+    }
+
+    public Product getProduct() {
+        return product;
+    }
+
+    public ProductOperationType getType() {
+        return type;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Transaction.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Transaction.java
index 51db3b5..fa22bd2 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Transaction.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/Transaction.java
@@ -1,4 +1,31 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
+import cz.cvut.fel.sit.omo.foodchain.node.INode;
+import cz.cvut.fel.sit.omo.foodchain.signature.Signature;
+import cz.cvut.fel.sit.omo.foodchain.signature.SignatureManager;
+
 public abstract class Transaction extends OperationBase {
+
+    private final TransactionType transactionType;
+    private final Signature signature;
+    private final INode nodeReceiver;
+
+    Transaction(INode creator, INode receiver, TransactionType type) {
+        super(creator);
+        transactionType = type;
+        nodeReceiver = receiver;
+        signature = SignatureManager.signTransaction(this);
+    }
+
+    public TransactionType getTransactionType() {
+        return transactionType;
+    }
+
+    public Signature getSignature() {
+        return signature;
+    }
+
+    public INode getNodeReceiver() {
+        return nodeReceiver;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/TransactionType.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/TransactionType.java
index eabd591..3323eae 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/TransactionType.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/operation/TransactionType.java
@@ -1,4 +1,6 @@
 package cz.cvut.fel.sit.omo.foodchain.operation;
 
 public enum TransactionType {
+
+    SALE, PURCHASE
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/Signature.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/Signature.java
index 935fe3a..8163663 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/Signature.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/Signature.java
@@ -1,4 +1,30 @@
 package cz.cvut.fel.sit.omo.foodchain.signature;
 
+import cz.cvut.fel.sit.omo.foodchain.operation.Transaction;
+
+import java.time.LocalDateTime;
+
 public class Signature {
+
+    private String managerCode;
+    private Transaction transaction;
+    private LocalDateTime signedDate;
+
+    public Signature(String code, Transaction transaction) {
+        managerCode = code;
+        this.transaction = transaction;
+        signedDate = LocalDateTime.now();
+    }
+
+    public Transaction getTransaction(String code) {
+        if (code.equals(managerCode))
+            return transaction;
+        return null;
+    }
+
+    public LocalDateTime getSignedDate(String code) {
+        if (code.equals(managerCode))
+            return signedDate;
+        return null;
+    }
 }
diff --git a/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/SignatureManager.java b/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/SignatureManager.java
index b9f94b5..03db230 100644
--- a/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/SignatureManager.java
+++ b/src/main/java/cz/cvut/fel/sit/omo/foodchain/signature/SignatureManager.java
@@ -1,4 +1,16 @@
 package cz.cvut.fel.sit.omo.foodchain.signature;
 
+import cz.cvut.fel.sit.omo.foodchain.operation.Transaction;
+
 public class SignatureManager {
+
+    private static final String MANAGER_CODE = "iW91AJWNOCmX1pbpLlW0";
+
+    public static Signature signTransaction(Transaction transaction) {
+        return new Signature(MANAGER_CODE, transaction);
+    }
+
+    public static boolean validateSignature(Transaction transaction) {
+        return transaction == transaction.getSignature().getTransaction(MANAGER_CODE);
+    }
 }