diff --git a/package.json b/package.json
index a854539..d680a20 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "hypermind",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "description": "A decentralized P2P counter of active deployments",
   "main": "server.js",
   "scripts": {
diff --git a/public/app.js b/public/app.js
index cf7bbcf..5397171 100644
--- a/public/app.js
+++ b/public/app.js
@@ -447,10 +447,23 @@ const getColorFromId = (id) => {
   return "#" + "00000".substring(0, 6 - c.length) + c;
 };
 
+const seenMessageIds = new Set();
+const messageIdHistory = [];
+
 const appendMessage = (msg) => {
   const div = document.createElement("div");
 
   if (msg.type === "CHAT") {
+    if (msg.id) {
+      if (seenMessageIds.has(msg.id)) return;
+      seenMessageIds.add(msg.id);
+      messageIdHistory.push(msg.id);
+      if (messageIdHistory.length > 100) {
+        const oldest = messageIdHistory.shift();
+        seenMessageIds.delete(oldest);
+      }
+    }
+
     // Block check
     if (blockedUsers.has(msg.sender)) return;
 
diff --git a/src/p2p/swarm.js b/src/p2p/swarm.js
index e8c1f0a..9fbe592 100644
--- a/src/p2p/swarm.js
+++ b/src/p2p/swarm.js
@@ -1,172 +1,203 @@
 const Hyperswarm = require("hyperswarm");
 const { signMessage } = require("../core/security");
-const { TOPIC, TOPIC_NAME, HEARTBEAT_INTERVAL, MAX_CONNECTIONS, CONNECTION_ROTATION_INTERVAL, ENABLE_CHAT } = require("../config/constants");
+const {
+  TOPIC,
+  TOPIC_NAME,
+  HEARTBEAT_INTERVAL,
+  MAX_CONNECTIONS,
+  CONNECTION_ROTATION_INTERVAL,
+  ENABLE_CHAT,
+} = require("../config/constants");
 const { generateScreenname } = require("../utils/name-generator");
 
 class SwarmManager {
-    constructor(identity, peerManager, diagnostics, messageHandler, relayFn, broadcastFn, chatSystemFn) {
-        this.identity = identity;
-        this.peerManager = peerManager;
-        this.diagnostics = diagnostics;
-        this.messageHandler = messageHandler;
-        this.relayFn = relayFn;
-        this.broadcastFn = broadcastFn;
-        this.chatSystemFn = chatSystemFn;
-
-        this.swarm = new Hyperswarm();
-        this.heartbeatInterval = null;
-        this.rotationInterval = null;
+  constructor(
+    identity,
+    peerManager,
+    diagnostics,
+    messageHandler,
+    relayFn,
+    broadcastFn,
+    chatSystemFn
+  ) {
+    this.identity = identity;
+    this.peerManager = peerManager;
+    this.diagnostics = diagnostics;
+    this.messageHandler = messageHandler;
+    this.relayFn = relayFn;
+    this.broadcastFn = broadcastFn;
+    this.chatSystemFn = chatSystemFn;
+
+    this.swarm = new Hyperswarm();
+    this.heartbeatInterval = null;
+    this.rotationInterval = null;
+  }
+
+  async start() {
+    this.swarm.on("connection", (socket) => this.handleConnection(socket));
+
+    const discovery = this.swarm.join(TOPIC);
+    await discovery.flushed();
+
+    this.startHeartbeat();
+    this.startRotation();
+  }
+
+  handleConnection(socket) {
+    if (this.swarm.connections.size > MAX_CONNECTIONS) {
+      socket.destroy();
+      return;
     }
 
-    async start() {
-        this.swarm.on("connection", (socket) => this.handleConnection(socket));
-
-        const discovery = this.swarm.join(TOPIC);
-        await discovery.flushed();
-
-        this.startHeartbeat();
-        this.startRotation();
-    }
+    socket.connectedAt = Date.now();
+
+    const sig = signMessage(
+      `seq:${this.peerManager.getSeq()}`,
+      this.identity.privateKey
+    );
+    const hello = JSON.stringify({
+      type: "HEARTBEAT",
+      id: this.identity.id,
+      seq: this.peerManager.getSeq(),
+      hops: 0,
+      nonce: this.identity.nonce,
+      sig,
+    });
+    socket.write(hello);
+    this.broadcastFn();
+
+    socket.buffer = "";
+
+    socket.on("data", (data) => {
+      this.diagnostics.increment("bytesReceived", data.length);
+      socket.buffer += data.toString();
+
+      const lines = socket.buffer.split("\n");
+
+      socket.buffer = lines.pop();
+
+      for (const msgStr of lines) {
+        if (!msgStr.trim()) continue;
+        try {
+          const msg = JSON.parse(msgStr);
+          this.messageHandler.handleMessage(msg, socket);
+        } catch (e) {}
+      }
+    });
+
+    socket.on("close", () => {
+      if (socket.peerId && this.peerManager.hasPeer(socket.peerId)) {
+        this.peerManager.removePeer(socket.peerId);
+      }
+      this.broadcastFn();
+    });
+
+    socket.on("error", () => {});
+  }
+
+  startHeartbeat() {
+    this.heartbeatInterval = setInterval(() => {
+      const seq = this.peerManager.incrementSeq();
+      this.peerManager.addOrUpdatePeer(this.identity.id, seq, null);
+
+      this.messageHandler.bloomFilter.markRelayed(this.identity.id, seq);
+
+      const sig = signMessage(`seq:${seq}`, this.identity.privateKey);
+      const heartbeat =
+        JSON.stringify({
+          type: "HEARTBEAT",
+          id: this.identity.id,
+          seq,
+          hops: 0,
+          nonce: this.identity.nonce,
+          sig,
+        }) + "\n";
 
-    handleConnection(socket) {
-        if (this.swarm.connections.size > MAX_CONNECTIONS) {
-            socket.destroy();
-            return;
-        }
+      for (const socket of this.swarm.connections) {
+        socket.write(heartbeat);
+      }
 
-        socket.connectedAt = Date.now();
-
-        const sig = signMessage(`seq:${this.peerManager.getSeq()}`, this.identity.privateKey);
-        const hello = JSON.stringify({
-            type: "HEARTBEAT",
-            id: this.identity.id,
-            seq: this.peerManager.getSeq(),
-            hops: 0,
-            nonce: this.identity.nonce,
-            sig,
-        });
-        socket.write(hello);
+      const removed = this.peerManager.cleanupStalePeers();
+      if (removed > 0) {
         this.broadcastFn();
-
-        socket.buffer = "";
-
-        socket.on("data", (data) => {
-            this.diagnostics.increment("bytesReceived", data.length);
-            socket.buffer += data.toString();
-
-            const lines = socket.buffer.split("\n");
-            // The last element is either an empty string (if data ended with \n)
-            // or the incomplete part of the next message.
-            socket.buffer = lines.pop();
-
-            for (const msgStr of lines) {
-                if (!msgStr.trim()) continue;
-                try {
-                    const msg = JSON.parse(msgStr);
-                    this.messageHandler.handleMessage(msg, socket);
-                } catch (e) {
-                    // Invalid JSON or partial message (shouldn't happen with buffering logic unless data is corrupted)
-                }
-            }
-        });
-
-        socket.on("close", () => {
-            if (socket.peerId && this.peerManager.hasPeer(socket.peerId)) {
-                this.peerManager.removePeer(socket.peerId);
-            }
-            this.broadcastFn();
-        });
-
-        socket.on("error", () => { });
+      }
+    }, HEARTBEAT_INTERVAL);
+  }
+
+  startRotation() {
+    this.rotationInterval = setInterval(() => {
+      if (this.swarm.connections.size < MAX_CONNECTIONS / 2) return;
+
+      let oldest = null;
+      for (const socket of this.swarm.connections) {
+        if (!oldest || socket.connectedAt < oldest.connectedAt) {
+          oldest = socket;
+        }
+      }
+
+      if (oldest) {
+        if (ENABLE_CHAT && this.chatSystemFn && oldest.peerId) {
+          this.chatSystemFn({
+            type: "SYSTEM",
+            content: `Connection with Node ...${oldest.peerId.slice(
+              -8
+            )} severed (Rotation).`,
+            timestamp: Date.now(),
+          });
+        }
+        oldest.destroy();
+      }
+    }, CONNECTION_ROTATION_INTERVAL);
+  }
+
+  shutdown() {
+    const sig = signMessage(
+      `type:LEAVE:${this.identity.id}`,
+      this.identity.privateKey
+    );
+    const goodbye =
+      JSON.stringify({
+        type: "LEAVE",
+        id: this.identity.id,
+        hops: 0,
+        sig,
+      }) + "\n";
+
+    this.messageHandler.bloomFilter.markRelayed(this.identity.id, "leave");
+
+    for (const socket of this.swarm.connections) {
+      socket.write(goodbye);
     }
 
-    startHeartbeat() {
-        this.heartbeatInterval = setInterval(() => {
-            const seq = this.peerManager.incrementSeq();
-            this.peerManager.addOrUpdatePeer(this.identity.id, seq, null);
-
-            const sig = signMessage(`seq:${seq}`, this.identity.privateKey);
-            const heartbeat = JSON.stringify({
-                type: "HEARTBEAT",
-                id: this.identity.id,
-                seq,
-                hops: 0,
-                nonce: this.identity.nonce,
-                sig,
-            }) + "\n";
-
-            for (const socket of this.swarm.connections) {
-                socket.write(heartbeat);
-            }
-
-            const removed = this.peerManager.cleanupStalePeers();
-            if (removed > 0) {
-                this.broadcastFn();
-            }
-        }, HEARTBEAT_INTERVAL);
+    if (this.heartbeatInterval) {
+      clearInterval(this.heartbeatInterval);
     }
 
-    startRotation() {
-        this.rotationInterval = setInterval(() => {
-            if (this.swarm.connections.size < MAX_CONNECTIONS / 2) return;
-
-            let oldest = null;
-            for (const socket of this.swarm.connections) {
-                if (!oldest || socket.connectedAt < oldest.connectedAt) {
-                    oldest = socket;
-                }
-            }
-
-            if (oldest) {
-                if (ENABLE_CHAT && this.chatSystemFn && oldest.peerId) {
-                    this.chatSystemFn({
-                        type: "SYSTEM",
-                        content: `Connection with Node ...${oldest.peerId.slice(-8)} severed (Rotation).`,
-                        timestamp: Date.now()
-                    });
-                }
-                oldest.destroy();
-            }
-        }, CONNECTION_ROTATION_INTERVAL);
+    if (this.rotationInterval) {
+      clearInterval(this.rotationInterval);
     }
 
-    shutdown() {
-        const sig = signMessage(`type:LEAVE:${this.identity.id}`, this.identity.privateKey);
-        const goodbye = JSON.stringify({
-            type: "LEAVE",
-            id: this.identity.id,
-            hops: 0,
-            sig,
-        }) + "\n";
-
-        for (const socket of this.swarm.connections) {
-            socket.write(goodbye);
-        }
-
-        if (this.heartbeatInterval) {
-            clearInterval(this.heartbeatInterval);
-        }
+    setTimeout(() => {
+      process.exit(0);
+    }, 500);
+  }
 
-        if (this.rotationInterval) {
-            clearInterval(this.rotationInterval);
-        }
+  getSwarm() {
+    return this.swarm;
+  }
 
-        setTimeout(() => {
-            process.exit(0);
-        }, 500);
-    }
+  broadcastChat(msg) {
+    if (!ENABLE_CHAT) return;
 
-    getSwarm() {
-        return this.swarm;
+    if (msg.id) {
+      this.messageHandler.bloomFilter.markRelayed(msg.id, "chat");
     }
 
-    broadcastChat(msg) {
-        if (!ENABLE_CHAT) return;
-        const msgStr = JSON.stringify(msg) + "\n";
-        for (const socket of this.swarm.connections) {
-            socket.write(msgStr);
-        }
+    const msgStr = JSON.stringify(msg) + "\n";
+    for (const socket of this.swarm.connections) {
+      socket.write(msgStr);
     }
+  }
 }
 
 module.exports = { SwarmManager };
diff --git a/src/state/peers.js b/src/state/peers.js
index 7b7882d..155de15 100644
--- a/src/state/peers.js
+++ b/src/state/peers.js
@@ -11,6 +11,12 @@ class PeerManager {
 
     addOrUpdatePeer(id, seq, ip = null) {
         const stored = this.seenPeers.get(id);
+        
+        // If we have a stored peer, only update if the new sequence is higher
+        if (stored && seq <= stored.seq) {
+            return false;
+        }
+
         const wasNew = !stored;
 
         // Track in HyperLogLog for total unique estimation