Plan the carrotcoin launch

blockchain.py

@@ -68,8 +68,13 @@ class Block:
                 return False
             if not self.transaction.is_valid_after_block(prev_block):
                 return False
-        elif self.transaction is not None:
-            return False
+        else:
+            if self.transaction is not None:
+                return False
+            # check for the correct miner pubkey - which will become public at launch day
+            h = hashlib.sha256(self.miner_pubkey).hexdigest()
+            if h != "88023d392db35f2d3936abd0532003ae0a38b4d35e4d123a0fa28c568c7e3e2f":
+                return False
         B_1_difficulty_sum, B_1_timestamp = self.get_difficulty_info(1, blockchain)
         B_10_difficulty_sum, B_10_timestamp = self.get_difficulty_info(10, blockchain)
         D = B_1_difficulty_sum - B_10_difficulty_sum