From c18d0a70c0153fdf8a8d5f6775c676f1571b8ec7 Mon Sep 17 00:00:00 2001
From: KOSASIH <kosasihg88@gmail.com>
Date: Tue, 26 Nov 2024 13:59:36 +0700
Subject: [PATCH] Create transaction.py

---
 QuantumNexusProtocol/src/core/transaction.py | 67 ++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 QuantumNexusProtocol/src/core/transaction.py

diff --git a/QuantumNexusProtocol/src/core/transaction.py b/QuantumNexusProtocol/src/core/transaction.py
new file mode 100644
index 000000000..31a19fce5
--- /dev/null
+++ b/QuantumNexusProtocol/src/core/transaction.py
@@ -0,0 +1,67 @@
+import hashlib
+import json
+from time import time
+
+class Transaction:
+    def __init__(self, sender, recipient, amount, timestamp=None):
+        self.sender = sender
+        self.recipient = recipient
+        self.amount = amount
+        self.timestamp = timestamp or time()
+        self.signature = None
+        self.multi_signatures = []
+
+    def calculate_hash(self):
+        transaction_string = json.dumps(self.__dict__, sort_keys=True).encode()
+        return hashlib.sha256(transaction_string).hexdigest()
+
+    def sign_transaction(self, private_key):
+        # Sign the transaction with the sender's private key
+        self.signature = self._create_signature(private_key)
+
+    def _create_signature(self, private_key):
+        # Implement signature creation logic (e.g., using ECDSA)
+        return "signature_based_on_private_key"
+
+    def add_multi_signature(self, signature):
+        self.multi_signatures.append(signature)
+
+    def validate_transaction(self):
+        # Validate the transaction's signature
+        if not self.signature:
+            return False
+        
+        # Here you would verify the signature using the sender's public key
+        return self._verify_signature(self.sender, self.signature)
+
+    def _verify_signature(self, public_key, signature):
+        # Implement signature verification logic
+        return True  # Placeholder for actual verification logic
+
+    def is_fungible(self):
+        # Check if the transaction is fungible (e.g., currency transfer)
+        return isinstance(self.amount, (int, float)) and self.amount > 0
+
+    def to_dict(self):
+        return {
+            'sender': self.sender,
+            'recipient': self.recipient,
+            'amount': self.amount,
+            'timestamp': self.timestamp,
+            'signature': self.signature,
+            'multi_signatures': self.multi_signatures
+        }
+
+class SmartContractTransaction(Transaction):
+    def __init__(self, sender, recipient, amount, contract_code, timestamp=None):
+        super().__init__(sender, recipient, amount, timestamp)
+        self.contract_code = contract_code  # Smart contract code
+
+    def execute_contract(self):
+        # Execute the smart contract logic
+        # This is a placeholder for actual contract execution logic
+        return f"Executing contract: {self.contract_code}"
+
+    def validate_contract(self):
+        # Validate the smart contract code (e.g., syntax check)
+        return True  # Placeholder for actual validation logic