diff --git a/carnot/carnot-vote-aggregation.py b/carnot/carnot-vote-aggregation.py
index 63d5242..3fe316a 100644
--- a/carnot/carnot-vote-aggregation.py
+++ b/carnot/carnot-vote-aggregation.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import Union, List, Set, Optional, Type, TypeAlias
+from typing import Union, List, Set, Optional, Type, TypeAlias, Dict
 from abc import ABC, abstractmethod
 
 Id = bytes
@@ -102,4 +102,136 @@ class NewView:
 
 Quorum: TypeAlias = Union[Set[Vote], Set[NewView]]
 
-Payload: TypeAlias = Union[Block, Vote, Timeout,  NewView, TimeoutQc]
+Payload: TypeAlias = Union[Block, Vote, Timeout, NewView, TimeoutQc]
+
+
+@dataclass
+class BroadCast:
+    payload: Payload
+
+
+@dataclass
+class Send:
+    to: [Id]
+    payload: Payload
+
+
+Event: TypeAlias = BroadCast | Send
+
+
+class Overlay:
+    """
+    Overlay structure for a View
+    """
+
+    @abstractmethod
+    def is_leader(self, _id: Id):
+        """
+        :param _id:  Node id to be checked
+        :return: true if node is the leader of the current view
+        """
+        return _id == self.leader()
+
+    @abstractmethod
+    def leader(self) -> Id:
+        """
+        :param view:
+        :return: the leader Id of the specified view
+        """
+        pass
+
+    @abstractmethod
+    def next_leader(self) -> Id:
+        pass
+
+    @abstractmethod
+    def is_member_of_leaf_committee(self, _id: Id) -> bool:
+        """
+        :param _id: Node id to be checked
+        :return: true if the participant with Id _id is in the leaf committee of the committee overlay
+        """
+        pass
+
+    @abstractmethod
+    def is_member_of_root_committee(self, _id: Id) -> bool:
+        """
+        :param _id:
+        :return: true if the participant with Id _id is member of the root committee withing the tree overlay
+        """
+        pass
+
+    @abstractmethod
+    def is_member_of_child_committee(self, parent: Id, child: Id) -> bool:
+        """
+        :param parent:
+        :param child:
+        :return: true if participant with Id child is member of the child committee of the participant with Id parent
+        """
+        pass
+
+    @abstractmethod
+    def parent_committee(self, _id: Id) -> Optional[Committee]:
+        """
+        :param _id:
+        :return: Some(parent committee) of the participant with Id _id withing the committee tree overlay
+        or Empty if the member with Id _id is a participant of the root committee
+        """
+        pass
+
+    @abstractmethod
+    def leaf_committees(self) -> Set[Committee]:
+        pass
+
+    @abstractmethod
+    def root_committee(self) -> Committee:
+        """
+        :return: returns root committee
+        """
+        pass
+
+    @abstractmethod
+    def is_child_of_root_committee(self, _id: Id) -> bool:
+        """
+        :return: returns child committee/s of root committee if present
+        """
+        pass
+
+    @abstractmethod
+    def leader_super_majority_threshold(self, _id: Id) -> int:
+        """
+        Amount of distinct number of messages for a node with Id _id member of a committee
+        The return value may change depending on which committee the node is member of, including the leader
+        :return:
+        """
+        pass
+
+    @abstractmethod
+    def super_majority_threshold(self, _id: Id) -> int:
+        pass
+
+
+class Carnot:
+    def __init__(self, _id: Id, overlay=Overlay()):
+        self.id: Id = _id
+        self.current_view: View = 0
+        self.highest_voted_view: View = -1
+        self.local_high_qc: Type[Qc] = None
+        self.safe_blocks: Dict[Id, Block] = dict()
+        self.last_view_timeout_qc: Type[TimeoutQc] = None
+        self.overlay: Overlay = overlay
+
+    def can_commit_grandparent(self, block) -> bool:
+        # Get the parent block and grandparent block from the safe_blocks dictionary
+        parent = self.safe_blocks.get(block.parent())
+        grandparent = self.safe_blocks.get(parent.parent())
+
+        # Check if both parent and grandparent exist
+        if parent is None or grandparent is None:
+            return False
+
+        # Check if the view numbers and QC types match the expected criteria
+        is_view_incremented = parent.view == grandparent.view + 1
+        is_standard_qc = isinstance(block.qc, StandardQc) and isinstance(parent.qc, StandardQc)
+
+        # Return True if both conditions are met
+        return is_view_incremented and is_standard_qc