diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90fdb24d1d2..344bc3215ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,7 +21,7 @@ As a minor extension, we have adopted a slightly different versioning convention
 | ----- | ------- |
 | N/A   | `-`     |
 
-## Mithril Distribution [2543] - 2025-11-03
+## Mithril Distribution [2543.1] - 2025-11-03
 
 - Client library, CLI and WASM:
   - **DEPRECATED**: The `with_aggregator_client` and `new` functions have been deprecated in the `ClientBuilder` struct of the library.
@@ -60,10 +60,10 @@ As a minor extension, we have adopted a slightly different versioning convention
 | mithril-client-cli  | `0.12.33` |
 | mithril-client-wasm | `0.9.7`   |
 | mithril-common      | `0.6.25`  |
-| mithril-signer      | `0.2.273` |
+| mithril-signer      | `0.2.276` |
 | mithril-stm         | `0.5.5`   |
 
-## Mithril Distribution [2537] - 2025-09-17
+## Mithril Distribution [2537.0] - 2025-09-17
 
 - Client library, CLI and WASM:
   - Support for stable `cardano_database_v2` backend in the `mithril-client` library.
diff --git a/Cargo.lock b/Cargo.lock
index 1976d4de071..44ef9f6de80 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4102,7 +4102,7 @@ dependencies = [
 
 [[package]]
 name = "mithril-signer"
-version = "0.2.275"
+version = "0.2.277"
 dependencies = [
  "anyhow",
  "async-trait",
diff --git a/mithril-signer/Cargo.toml b/mithril-signer/Cargo.toml
index c5ce5384531..6ba33861235 100644
--- a/mithril-signer/Cargo.toml
+++ b/mithril-signer/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mithril-signer"
-version = "0.2.275"
+version = "0.2.277"
 description = "A Mithril Signer"
 authors = { workspace = true }
 edition = { workspace = true }
diff --git a/mithril-signer/src/runtime/runner.rs b/mithril-signer/src/runtime/runner.rs
index 11b3bc560ea..a3390e9332e 100644
--- a/mithril-signer/src/runtime/runner.rs
+++ b/mithril-signer/src/runtime/runner.rs
@@ -207,37 +207,41 @@ impl Runner for SignerRunner {
             ),
             None => None,
         };
-        let protocol_initializer = MithrilProtocolInitializerBuilder::build(
-            stake,
-            &protocol_parameters,
-            self.services.kes_signer.clone(),
-            kes_period,
-        )?;
-        self.services
-            .protocol_initializer_store
-            .save_protocol_initializer(epoch_offset_to_recording_epoch, protocol_initializer)
-            .await?;
 
         let protocol_initializer = self
             .services
             .protocol_initializer_store
             .get_protocol_initializer(epoch_offset_to_recording_epoch)
-            .await?.ok_or(RunnerError::NoValueError(
-                format!("no protocol_initializer available in store for epoch {epoch_offset_to_recording_epoch}"),
-            )).with_context(
+            .await
+            .with_context(
                 || "register_signer_to_aggregator can not retrieve protocol initializer from store",
             )?;
-        let signer = Signer::new(
-            self.services.single_signer.get_party_id(),
-            protocol_initializer.verification_key().into(),
-            protocol_initializer.verification_key_signature(),
-            protocol_operational_certificate,
-            kes_period,
-        );
-        self.services
-            .certificate_handler
-            .register_signer(epoch_offset_to_recording_epoch, &signer)
-            .await?;
+
+        if protocol_initializer.is_none() {
+            let protocol_initializer = MithrilProtocolInitializerBuilder::build(
+                stake,
+                &protocol_parameters,
+                self.services.kes_signer.clone(),
+                kes_period,
+            )?;
+
+            let signer = Signer::new(
+                self.services.single_signer.get_party_id(),
+                protocol_initializer.verification_key().into(),
+                protocol_initializer.verification_key_signature(),
+                protocol_operational_certificate,
+                kes_period,
+            );
+            self.services
+                .certificate_handler
+                .register_signer(epoch_offset_to_recording_epoch, &signer)
+                .await?;
+
+            self.services
+                .protocol_initializer_store
+                .save_protocol_initializer(epoch_offset_to_recording_epoch, protocol_initializer)
+                .await?;
+        }
 
         Ok(())
     }
@@ -705,6 +709,9 @@ mod tests {
             "A protocol initializer should have been registered at the 'Recording' epoch"
         );
 
+        let total_registered_signers = certificate_handler.get_total_registered_signers().await;
+        assert_eq!(1, total_registered_signers);
+
         runner
             .register_signer_to_aggregator()
             .await
@@ -725,6 +732,9 @@ mod tests {
             serde_json::to_string(&last_registered_signer_second_registration).unwrap(),
             "The signer registration should be the same and should have been registered twice"
         );
+
+        let total_registered_signers = certificate_handler.get_total_registered_signers().await;
+        assert_eq!(1, total_registered_signers);
     }
 
     #[tokio::test]
diff --git a/mithril-signer/src/services/aggregator_client.rs b/mithril-signer/src/services/aggregator_client.rs
index 9a77a0db619..01578642511 100644
--- a/mithril-signer/src/services/aggregator_client.rs
+++ b/mithril-signer/src/services/aggregator_client.rs
@@ -99,6 +99,7 @@ pub(crate) mod dumb {
         epoch_settings: RwLock<Option<SignerEpochSettings>>,
         last_registered_signer: RwLock<Option<Signer>>,
         aggregator_features: RwLock<AggregatorFeaturesMessage>,
+        total_registered_signers: RwLock<u32>,
     }
 
     impl DumbAggregatorClient {
@@ -106,6 +107,11 @@ pub(crate) mod dumb {
         pub async fn get_last_registered_signer(&self) -> Option<Signer> {
             self.last_registered_signer.read().await.clone()
         }
+
+        /// Return the total number of signers that called with the `register` method.
+        pub async fn get_total_registered_signers(&self) -> u32 {
+            *self.total_registered_signers.read().await
+        }
     }
 
     impl Default for DumbAggregatorClient {
@@ -114,6 +120,7 @@ pub(crate) mod dumb {
                 epoch_settings: RwLock::new(Some(SignerEpochSettings::dummy())),
                 last_registered_signer: RwLock::new(None),
                 aggregator_features: RwLock::new(AggregatorFeaturesMessage::dummy()),
+                total_registered_signers: RwLock::new(0),
             }
         }
     }
@@ -132,6 +139,9 @@ pub(crate) mod dumb {
             let signer = signer.clone();
             *last_registered_signer = Some(signer);
 
+            let mut total_registered_signers = self.total_registered_signers.write().await;
+            *total_registered_signers += 1;
+
             Ok(())
         }