diff --git a/p2p/network.go b/p2p/network.go
index 1409243..cd62498 100644
--- a/p2p/network.go
+++ b/p2p/network.go
@@ -85,13 +85,13 @@ func (n *Network) PeerIDs() []PeerID {
 }
 
 // Publish sends a message to the specified node's message queue.
-func (n *Network) Publish(nodeID PeerID, msg string, protocol BroadcastProtocol) error {
+func (n *Network) Publish(nodeID PeerID, msg string, protocol BroadcastProtocol, customProtocol func(msg Message, known []PeerID, sent []PeerID, received []PeerID, params map[string]any) *[]PeerID) error {
 	if node, ok := n.nodes[nodeID]; ok {
 		if !node.alive {
 			return fmt.Errorf("node %d is not alive", nodeID)
 		}
 
-		node.msgQueue <- Message{From: nodeID, Content: msg, Protocol: protocol, HopCount: 0}
+		node.msgQueue <- Message{From: nodeID, Content: msg, Protocol: protocol, HopCount: 0, CustomProtocol: customProtocol}
 		return nil
 	}
 
diff --git a/p2p/node.go b/p2p/node.go
index 6ad51c9..e311c5c 100644
--- a/p2p/node.go
+++ b/p2p/node.go
@@ -51,12 +51,12 @@ func (n *p2pNode) eachRun(network *Network, wg *sync.WaitGroup, ctx context.Cont
 		n.alive = true
 		wg.Done()
 
-		for msg := range n.msgQueue {
-			select {
-			case <-ctx.Done():
-				n.alive = false
-				return
-			default:
+		select {
+		case <-ctx.Done():
+			n.alive = false
+			return
+		default:
+			for msg := range n.msgQueue {
 				first := false
 
 				n.mu.Lock()
@@ -117,7 +117,6 @@ func (n *p2pNode) publish(network *Network, msg Message) {
 			if _, received := n.recvFrom[content][edge.targetID]; received {
 				continue
 			}
-			n.sentTo[content][edge.targetID] = struct{}{}
 
 			willSendEdges = append(willSendEdges, edge)
 		}
@@ -128,25 +127,52 @@ func (n *p2pNode) publish(network *Network, msg Message) {
 			})
 
 			k := int(float64(len(willSendEdges)) * network.cfg.GossipFactor)
+
 			willSendEdges = willSendEdges[:k]
 		}
 	} else if protocol == Custom {
+		allEdges := make([]PeerID, 0)
+		for _, edge := range n.edges {
+			allEdges = append(allEdges, edge.targetID)
+		}
 
+		sentEdges := make([]PeerID, 0)
+		for targetID := range n.sentTo[content] {
+			sentEdges = append(sentEdges, targetID)
+		}
+
+		receivedEdges := make([]PeerID, 0)
+		for senderID := range n.recvFrom[content] {
+			receivedEdges = append(receivedEdges, senderID)
+		}
+
+		targets := msg.CustomProtocol(msg, allEdges, sentEdges, receivedEdges, network.cfg.CustomParams)
+
+		for _, targetID := range *targets {
+			for _, edge := range n.edges {
+				if edge.targetID == targetID {
+					willSendEdges = append(willSendEdges, edge)
+					break
+				}
+			}
+		}
 	} else {
 		return
 	}
 
 	for _, edge := range willSendEdges {
 		edgeCopy := edge
+		n.sentTo[content][edge.targetID] = struct{}{}
 
 		go func(e p2pEdge) {
 			time.Sleep(time.Duration(e.edgeLatency) * time.Millisecond)
 
 			network.nodes[e.targetID].msgQueue <- Message{
-				From:     n.id,
-				Content:  content,
-				Protocol: protocol,
-				HopCount: hopCount + 1,
+				From:           n.id,
+				Content:        content,
+				Protocol:       protocol,
+				HopCount:       hopCount + 1,
+				CustomProtocol: msg.CustomProtocol,
 			}
 		}(edgeCopy)
 	}
diff --git a/p2p/p2p.go b/p2p/p2p.go
index 55db4af..0402fe1 100644
--- a/p2p/p2p.go
+++ b/p2p/p2p.go
@@ -6,13 +6,15 @@ type PeerID uint64
 
 // Message represents a message sent between nodes in the P2P network.
 type Message struct {
-	From     PeerID
-	Content  string
-	Protocol BroadcastProtocol
-	HopCount int
+	From           PeerID
+	Content        string
+	Protocol       BroadcastProtocol
+	HopCount       int
+	CustomProtocol func(Message, []PeerID, []PeerID, []PeerID, map[string]any) *[]PeerID
 }
 
 // Config holds configuration parameters for the P2P network.
 type Config struct {
-	GossipFactor float64 // fraction of neighbors to gossip to
+	GossipFactor float64        // fraction of neighbors to gossip to
+	CustomParams map[string]any // parameters for custom protocols
 }
diff --git a/p2p/p2p_test.go b/p2p/p2p_test.go
index 328a3fb..004f484 100644
--- a/p2p/p2p_test.go
+++ b/p2p/p2p_test.go
@@ -37,7 +37,7 @@ func TestGenerateNetwork(t *testing.T) {
 	nw.RunNetworkSimulation(ctx)
 
 	t.Logf("Publishing message '%s' from node %d\n", msg1, nw.PeerIDs()[0])
-	err = nw.Publish(nw.PeerIDs()[0], msg1, p2p.Flooding)
+	err = nw.Publish(nw.PeerIDs()[0], msg1, p2p.Flooding, nil)
 	if err != nil {
 		t.Fatalf("Failed to publish message: %v", err)
 	}
@@ -45,7 +45,7 @@ func TestGenerateNetwork(t *testing.T) {
 	t.Logf("Reachability of message '%s': %f\n", msg1, nw.Reachability(msg1))
 
 	t.Logf("Publishing message '%s' from node %d\n", msg2, nw.PeerIDs()[1])
-	err = nw.Publish(nw.PeerIDs()[1], msg2, p2p.Gossiping)
+	err = nw.Publish(nw.PeerIDs()[1], msg2, p2p.Gossiping, nil)
 	if err != nil {
 		t.Fatalf("Failed to publish message: %v", err)
 	}
@@ -56,7 +56,7 @@ func TestGenerateNetwork(t *testing.T) {
 
 	nw.RunNetworkSimulation(context.Background())
 	t.Logf("Publishing message '%s' from node %d\n", msg3, nw.PeerIDs()[2])
-	err = nw.Publish(nw.PeerIDs()[2], msg3, p2p.Gossiping)
+	err = nw.Publish(nw.PeerIDs()[2], msg3, p2p.Gossiping, nil)
 	if err != nil {
 		t.Fatalf("Failed to publish message: %v", err)
 	}
@@ -104,7 +104,7 @@ func TestMetrics(t *testing.T) {
 	nw.RunNetworkSimulation(ctx)
 
 	t.Logf("Publishing message '%s' from node %d\n", msg1, nw.PeerIDs()[0])
-	err = nw.Publish(nw.PeerIDs()[0], msg1, p2p.Flooding)
+	err = nw.Publish(nw.PeerIDs()[0], msg1, p2p.Flooding, nil)
 	if err != nil {
 		t.Fatalf("Failed to publish message: %v", err)
 	}