diff --git a/crates/topos-tce-broadcast/src/double_echo/mod.rs b/crates/topos-tce-broadcast/src/double_echo/mod.rs
index ddcf9af76..a9c50336d 100644
--- a/crates/topos-tce-broadcast/src/double_echo/mod.rs
+++ b/crates/topos-tce-broadcast/src/double_echo/mod.rs
@@ -17,7 +17,7 @@ use crate::event::ProtocolEvents;
 use crate::{DoubleEchoCommand, SubscriptionsView};
 use std::collections::HashSet;
 use std::sync::Arc;
-use tokio::sync::{broadcast, mpsc, oneshot};
+use tokio::sync::{broadcast, mpsc, oneshot, Mutex};
 use tokio_util::sync::CancellationToken;
 use topos_config::tce::broadcast::ReliableBroadcastParams;
 use topos_core::{types::ValidatorId, uci::CertificateId};
@@ -49,6 +49,7 @@ pub struct DoubleEcho {
     /// List of approved validators through smart contract and/or genesis
     pub validators: HashSet<ValidatorId>,
     pub validator_store: Arc<ValidatorStore>,
+    pub delivered_certificates: Arc<Mutex<HashSet<CertificateId>>>,
     pub broadcast_sender: broadcast::Sender<CertificateDeliveredWithPositions>,
 
     pub task_manager_cancellation: CancellationToken,
@@ -85,6 +86,7 @@ impl DoubleEcho {
             },
             shutdown,
             validator_store,
+            delivered_certificates: Arc::new(Mutex::new(HashSet::new())),
             broadcast_sender,
             task_manager_cancellation: CancellationToken::new(),
         }
@@ -102,6 +104,7 @@ impl DoubleEcho {
             self.params.clone(),
             self.message_signer.clone(),
             self.validator_store.clone(),
+            self.delivered_certificates.clone(),
             self.broadcast_sender.clone(),
         );
 
@@ -159,6 +162,10 @@ impl DoubleEcho {
                                         continue;
                                     }
 
+                                    if let Some(cert_id) = self.delivered_certificates.lock().await.get(&certificate_id) {
+                                        debug!("ECHO message received for already delivered certificate: {}", cert_id);
+                                        continue;
+                                    }
                                     self.handle_echo(certificate_id, validator_id, signature).await
                                 },
                                 DoubleEchoCommand::Ready { certificate_id, validator_id, signature } => {
@@ -176,7 +183,10 @@ impl DoubleEcho {
                                         debug!("READY message signature cannot be verified from: {}", e);
                                         continue;
                                     }
-
+                                    if let Some(cert_id) = self.delivered_certificates.lock().await.get(&certificate_id) {
+                                        debug!("READY message received for already delivered certificate: {}", cert_id);
+                                        continue;
+                                    }
                                     self.handle_ready(certificate_id, validator_id, signature).await
                                 },
                             }
diff --git a/crates/topos-tce-broadcast/src/task_manager/mod.rs b/crates/topos-tce-broadcast/src/task_manager/mod.rs
index 5492797bf..009c79f69 100644
--- a/crates/topos-tce-broadcast/src/task_manager/mod.rs
+++ b/crates/topos-tce-broadcast/src/task_manager/mod.rs
@@ -2,12 +2,12 @@ use crate::event::ProtocolEvents;
 use futures::stream::FuturesUnordered;
 use futures::Future;
 use futures::StreamExt;
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::future::IntoFuture;
 use std::pin::Pin;
 use std::sync::Arc;
 use std::time::Duration;
-use tokio::sync::broadcast;
+use tokio::sync::{broadcast, Mutex};
 use tokio::{spawn, sync::mpsc};
 use tokio_util::sync::CancellationToken;
 use topos_config::tce::broadcast::ReliableBroadcastParams;
@@ -52,6 +52,7 @@ pub struct TaskManager {
     pub thresholds: ReliableBroadcastParams,
     pub validator_id: ValidatorId,
     pub validator_store: Arc<ValidatorStore>,
+    pub delivered_certficiates: Arc<Mutex<HashSet<CertificateId>>>,
     pub broadcast_sender: broadcast::Sender<CertificateDeliveredWithPositions>,
     pub latest_pending_id: PendingCertificateId,
 }
@@ -66,6 +67,7 @@ impl TaskManager {
         thresholds: ReliableBroadcastParams,
         message_signer: Arc<MessageSigner>,
         validator_store: Arc<ValidatorStore>,
+        delivered_certficiates: Arc<Mutex<HashSet<CertificateId>>>,
         broadcast_sender: broadcast::Sender<CertificateDeliveredWithPositions>,
     ) -> Self {
         Self {
@@ -79,6 +81,7 @@ impl TaskManager {
             message_signer,
             thresholds,
             validator_store,
+            delivered_certficiates,
             broadcast_sender,
             latest_pending_id: 0,
         }
@@ -174,8 +177,8 @@ impl TaskManager {
                     if let TaskStatus::Success = status {
                         trace!("Task for certificate {} finished successfully", certificate_id);
                         self.tasks.remove(&certificate_id);
+                        self.delivered_certficiates.lock().await.insert(certificate_id);
                         DOUBLE_ECHO_ACTIVE_TASKS_COUNT.dec();
-
                     } else {
                         error!("Task for certificate {} finished unsuccessfully", certificate_id);
                     }
diff --git a/crates/topos-tce-broadcast/src/tests/task_manager.rs b/crates/topos-tce-broadcast/src/tests/task_manager.rs
index 672da59f7..10b116e12 100644
--- a/crates/topos-tce-broadcast/src/tests/task_manager.rs
+++ b/crates/topos-tce-broadcast/src/tests/task_manager.rs
@@ -31,6 +31,7 @@ async fn can_start(
     let (broadcast_sender, _) = broadcast::channel(1);
     let shutdown = CancellationToken::new();
     let validator_id = ValidatorId::default();
+    let delivered_certificates = Default::default();
     let thresholds = topos_config::tce::broadcast::ReliableBroadcastParams {
         echo_threshold: 1,
         ready_threshold: 1,
@@ -45,6 +46,7 @@ async fn can_start(
         thresholds,
         message_signer,
         validator_store,
+        delivered_certificates,
         broadcast_sender,
     );