Create ledger.py

blockchain/ledger/ledger.py

@@ -0,0 +1,32 @@
+import hashlib
+import time
+
+class Ledger:
+    def __init__(self):
+        self.chain = []
+        self.create_genesis_block()
+
+    def create_genesis_block(self):
+        """Create the genesis block of the blockchain."""
+        genesis_block = {
+            'index': 0,
+            'timestamp': int(time.time()),
+            'data': 'Genesis Block',
+            'previous_hash': '0' * 64
+        }
+        self.chain.append(genesis_block)
+
+    def calculate_hash(self, block):
+        """Calculate the hash of a block."""
+        block_string = json.dumps(block, sort_keys=True).encode()
+        return hashlib.sha256(block_string).hexdigest()
+
+    def add_block(self, data):"""Add a new block to the blockchain."""
+        previous_block = self.chain[-1]
+        new_block = {
+            'index': len(self.chain),
+            'timestamp': int(time.time()),
+            'data': data,
+            'previous_hash': self.calculate_hash(previous_block)
+        }
+        self.chain.append(new_block)