Create block.py

src/blockchain/block.py

@@ -0,0 +1,36 @@
+import hashlib
+import json
+from time import time
+from typing import Any
+
+class Transaction:
+    def __init__(self, sender: str, receiver: str, amount: int):
+        self.sender = sender
+        self.receiver = receiver
+        self.amount = amount
+
+    def to_dict(self) -> dict:
+        return {
+            'sender': self.sender,
+            'receiver': self.receiver,
+            'amount': self.amount
+        }
+
+class Block:
+    def __init__(self, index: int, previous_hash: str, timestamp: int, transactions: list[Transaction], nonce: int = 0):
+        self.index = index
+        self.previous_hash = previous_hash
+        self.timestamp = timestamp
+        self.transactions = transactions
+        self.nonce = nonce
+        self.hash = self.calculate_hash()
+
+    def calculate_hash(self) -> str:
+        block_data = json.dumps(self.__dict__, sort_keys=True).encode()
+        return hashlib.sha256(block_data).hexdigest()
+
+    def mine_block(self, difficulty: int):
+        prefix = '0' * difficulty
+        while not self.hash.startswith(prefix):
+            self.nonce += 1
+            self.hash = self.calculate_hash()