diff --git a/nodes/nomos-node/src/lib.rs b/nodes/nomos-node/src/lib.rs
index 2973c376..7783b856 100644
--- a/nodes/nomos-node/src/lib.rs
+++ b/nodes/nomos-node/src/lib.rs
@@ -3,9 +3,8 @@ mod tx;
 
 use color_eyre::eyre::Result;
 use consensus_engine::overlay::{FlatOverlay, RandomBeaconState, RoundRobin};
-use full_replication::Blob;
-
-use full_replication::{AbsoluteNumber, Attestation, Certificate, FullReplication};
+use full_replication::Certificate;
+use full_replication::{AbsoluteNumber, Attestation, Blob, FullReplication};
 #[cfg(feature = "metrics")]
 use metrics::{backend::map::MapMetricsBackend, types::MetricsData, MetricsService};
 use nomos_consensus::network::adapters::libp2p::Libp2pAdapter as ConsensusLibp2pAdapter;
@@ -31,7 +30,8 @@ use overwatch_rs::services::handle::ServiceHandle;
 
 pub use config::{Config, ConsensusArgs, HttpArgs, LogArgs, NetworkArgs, OverlayArgs};
 use nomos_core::{
-    da::blob::select::FillSize as FillSizeWithBlobs, tx::select::FillSize as FillSizeWithTx,
+    da::certificate::select::FillSize as FillSizeWithBlobsCertificate,
+    tx::select::FillSize as FillSizeWithTx,
 };
 pub use tx::Tx;
 
@@ -42,9 +42,9 @@ pub type Carnot = CarnotConsensus<
     MockPool<Tx>,
     MempoolLibp2pAdapter<Tx>,
     FlatOverlay<RoundRobin, RandomBeaconState>,
-    Blob,
+    Certificate,
     FillSizeWithTx<MB16, Tx>,
-    FillSizeWithBlobs<MB16, Blob>,
+    FillSizeWithBlobsCertificate<MB16, Certificate>,
 >;
 
 type DataAvailability = DataAvailabilityService<
diff --git a/nomos-core/src/block/builder.rs b/nomos-core/src/block/builder.rs
index 30eba0c9..2d32ac47 100644
--- a/nomos-core/src/block/builder.rs
+++ b/nomos-core/src/block/builder.rs
@@ -5,7 +5,8 @@ use serde::de::DeserializeOwned;
 use serde::Serialize;
 // internal
 use crate::block::Block;
-use crate::da::blob::{Blob, BlobSelect};
+use crate::da::certificate::BlobCertificateSelect;
+use crate::da::certificate::Certificate;
 use crate::tx::{Transaction, TxSelect};
 use consensus_engine::overlay::RandomBeaconState;
 use consensus_engine::{NodeId, Qc, View};
@@ -39,12 +40,12 @@ pub struct BlockBuilder<Tx, Blob, TxSelector, BlobSelector> {
     blobs: Option<Box<dyn Iterator<Item = Blob>>>,
 }
 
-impl<Tx, B, TxSelector, BlobSelector> BlockBuilder<Tx, B, TxSelector, BlobSelector>
+impl<Tx, C, TxSelector, BlobSelector> BlockBuilder<Tx, C, TxSelector, BlobSelector>
 where
     Tx: Transaction + Clone + Eq + Hash + Serialize + DeserializeOwned,
-    B: Blob + Clone + Eq + Hash + Serialize + DeserializeOwned,
+    C: Certificate + Clone + Eq + Hash + Serialize + DeserializeOwned,
     TxSelector: TxSelect<Tx = Tx>,
-    BlobSelector: BlobSelect<Blob = B>,
+    BlobSelector: BlobCertificateSelect<Certificate = C>,
 {
     pub fn new(tx_selector: TxSelector, blob_selector: BlobSelector) -> Self {
         Self {
@@ -90,13 +91,16 @@ where
     }
 
     #[must_use]
-    pub fn with_blobs(mut self, blobs: impl Iterator<Item = B> + 'static) -> Self {
-        self.blobs = Some(Box::new(blobs));
+    pub fn with_blobs_certificates(
+        mut self,
+        blobs_certificates: impl Iterator<Item = C> + 'static,
+    ) -> Self {
+        self.blobs = Some(Box::new(blobs_certificates));
         self
     }
 
     #[allow(clippy::result_large_err)]
-    pub fn build(self) -> Result<Block<Tx, B>, Self> {
+    pub fn build(self) -> Result<Block<Tx, C>, Self> {
         if let Self {
             tx_selector,
             blob_selector,
diff --git a/nomos-core/src/da/blob/mod.rs b/nomos-core/src/da/blob/mod.rs
index 9486dbb9..f7780db4 100644
--- a/nomos-core/src/da/blob/mod.rs
+++ b/nomos-core/src/da/blob/mod.rs
@@ -1,5 +1,3 @@
-pub mod select;
-
 use bytes::Bytes;
 use std::hash::Hash;
 
@@ -13,14 +11,3 @@ pub trait Blob {
     }
     fn as_bytes(&self) -> Bytes;
 }
-
-pub trait BlobSelect {
-    type Blob: Blob;
-    type Settings: Clone;
-
-    fn new(settings: Self::Settings) -> Self;
-    fn select_blob_from<'i, I: Iterator<Item = Self::Blob> + 'i>(
-        &self,
-        blobs: I,
-    ) -> Box<dyn Iterator<Item = Self::Blob> + 'i>;
-}
diff --git a/nomos-core/src/da/certificate/mod.rs b/nomos-core/src/da/certificate/mod.rs
index 35600aaf..92425f62 100644
--- a/nomos-core/src/da/certificate/mod.rs
+++ b/nomos-core/src/da/certificate/mod.rs
@@ -1 +1,22 @@
-pub trait Certificate {}
+pub mod select;
+
+use crate::da::blob::Blob;
+use bytes::Bytes;
+
+pub trait Certificate {
+    type Blob: Blob;
+    fn blob(&self) -> <Self::Blob as Blob>::Hash;
+
+    fn as_bytes(&self) -> Bytes;
+}
+
+pub trait BlobCertificateSelect {
+    type Certificate: Certificate;
+    type Settings: Clone;
+
+    fn new(settings: Self::Settings) -> Self;
+    fn select_blob_from<'i, I: Iterator<Item = Self::Certificate> + 'i>(
+        &self,
+        certificates: I,
+    ) -> Box<dyn Iterator<Item = Self::Certificate> + 'i>;
+}
diff --git a/nomos-core/src/da/blob/select.rs b/nomos-core/src/da/certificate/select.rs
similarity index 60%
rename from nomos-core/src/da/blob/select.rs
rename to nomos-core/src/da/certificate/select.rs
index d00723b4..07d1dae7 100644
--- a/nomos-core/src/da/blob/select.rs
+++ b/nomos-core/src/da/certificate/select.rs
@@ -3,7 +3,7 @@ use std::marker::PhantomData;
 // crates
 
 // internal
-use crate::da::blob::{Blob, BlobSelect};
+use crate::da::certificate::{BlobCertificateSelect, Certificate};
 use crate::utils;
 
 #[derive(Default, Clone, Copy)]
@@ -19,21 +19,21 @@ impl<const SIZE: usize, B> FillSize<SIZE, B> {
     }
 }
 
-impl<const SIZE: usize, B: Blob> BlobSelect for FillSize<SIZE, B> {
-    type Blob = B;
+impl<const SIZE: usize, C: Certificate> BlobCertificateSelect for FillSize<SIZE, C> {
+    type Certificate = C;
     type Settings = ();
 
     fn new(_settings: Self::Settings) -> Self {
         FillSize::new()
     }
 
-    fn select_blob_from<'i, I: Iterator<Item = Self::Blob> + 'i>(
+    fn select_blob_from<'i, I: Iterator<Item = Self::Certificate> + 'i>(
         &self,
-        blobs: I,
-    ) -> Box<dyn Iterator<Item = Self::Blob> + 'i> {
-        utils::select::select_from_till_fill_size::<SIZE, Self::Blob>(
+        certificates: I,
+    ) -> Box<dyn Iterator<Item = Self::Certificate> + 'i> {
+        utils::select::select_from_till_fill_size::<SIZE, Self::Certificate>(
             |blob| blob.as_bytes().len(),
-            blobs,
+            certificates,
         )
     }
 }
diff --git a/nomos-da/full-replication/src/lib.rs b/nomos-da/full-replication/src/lib.rs
index 033d7375..398de11b 100644
--- a/nomos-da/full-replication/src/lib.rs
+++ b/nomos-da/full-replication/src/lib.rs
@@ -6,12 +6,14 @@ use nomos_core::da::{
 };
 // std
 use std::collections::HashSet;
+use std::hash::{Hash, Hasher};
 // crates
 use blake2::{
     digest::{Update, VariableOutput},
     Blake2bVar,
 };
 use bytes::Bytes;
+use nomos_core::wire;
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone)]
@@ -99,15 +101,15 @@ fn hasher(blob: &Blob) -> [u8; 32] {
 }
 
 impl blob::Blob for Blob {
-    type Hash = [u8; 32];
     const HASHER: BlobHasher<Self> = hasher as BlobHasher<Self>;
+    type Hash = [u8; 32];
 
     fn as_bytes(&self) -> bytes::Bytes {
         self.data.clone()
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq)]
 pub struct Attestation {
     blob: [u8; 32],
     voter: [u8; 32],
@@ -119,16 +121,36 @@ impl attestation::Attestation for Attestation {
         self.blob
     }
     fn as_bytes(&self) -> Bytes {
-        Bytes::from([self.blob.as_ref(), self.voter.as_ref()].concat())
+        wire::serialize(self)
+            .expect("Attestation shouldn't fail to be serialized")
+            .into()
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq)]
 pub struct Certificate {
     attestations: Vec<Attestation>,
 }
 
-impl certificate::Certificate for Certificate {}
+impl Hash for Certificate {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        state.write(certificate::Certificate::as_bytes(self).as_ref());
+    }
+}
+
+impl certificate::Certificate for Certificate {
+    type Blob = Blob;
+
+    fn blob(&self) -> <Self::Blob as blob::Blob>::Hash {
+        self.attestations[0].blob
+    }
+
+    fn as_bytes(&self) -> Bytes {
+        wire::serialize(self)
+            .expect("Certificate shouldn't fail to be serialized")
+            .into()
+    }
+}
 
 // TODO: add generic impl when the trait for Certificate is expanded
 impl DaProtocol for FullReplication<AbsoluteNumber<Attestation, Certificate>> {
diff --git a/nomos-services/consensus/src/lib.rs b/nomos-services/consensus/src/lib.rs
index 8529ac94..784bb062 100644
--- a/nomos-services/consensus/src/lib.rs
+++ b/nomos-services/consensus/src/lib.rs
@@ -37,7 +37,7 @@ use task_manager::TaskManager;
 use crate::committee_membership::UpdateableCommitteeMembership;
 use nomos_core::block::builder::BlockBuilder;
 use nomos_core::block::Block;
-use nomos_core::da::blob::{Blob, BlobSelect};
+use nomos_core::da::certificate::{BlobCertificateSelect, Certificate};
 use nomos_core::tx::{Transaction, TxSelect};
 use nomos_core::vote::Tally;
 use nomos_mempool::{
@@ -103,7 +103,7 @@ impl<O: Overlay, Ts, Bs> CarnotSettings<O, Ts, Bs> {
     }
 }
 
-pub struct CarnotConsensus<A, P, M, O, B, TxS, BS>
+pub struct CarnotConsensus<A, P, M, O, C, TxS, BS>
 where
     A: NetworkAdapter,
     M: MempoolAdapter<Tx = P::Tx>,
@@ -113,7 +113,7 @@ where
     <P::Tx as Transaction>::Hash: Debug,
     A::Backend: 'static,
     TxS: TxSelect<Tx = P::Tx>,
-    BS: BlobSelect<Blob = B>,
+    BS: BlobCertificateSelect<Certificate = C>,
 {
     service_state: ServiceStateHandle<Self>,
     // underlying networking backend. We need this so we can relay and check the types properly
@@ -122,10 +122,10 @@ where
     mempool_relay: Relay<MempoolService<M, P>>,
     _overlay: std::marker::PhantomData<O>,
     // this need to be substituted by some kind DA bo
-    _blob: std::marker::PhantomData<B>,
+    _blob_certificate: std::marker::PhantomData<C>,
 }
 
-impl<A, P, M, O, B, TxS, BS> ServiceData for CarnotConsensus<A, P, M, O, B, TxS, BS>
+impl<A, P, M, O, C, TxS, BS> ServiceData for CarnotConsensus<A, P, M, O, C, TxS, BS>
 where
     A: NetworkAdapter,
     P: MemPool,
@@ -134,7 +134,7 @@ where
     M: MempoolAdapter<Tx = P::Tx>,
     O: Overlay + Debug,
     TxS: TxSelect<Tx = P::Tx>,
-    BS: BlobSelect<Blob = B>,
+    BS: BlobCertificateSelect<Certificate = C>,
 {
     const SERVICE_ID: ServiceId = "Carnot";
     type Settings = CarnotSettings<O, TxS::Settings, BS::Settings>;
@@ -144,7 +144,7 @@ where
 }
 
 #[async_trait::async_trait]
-impl<A, P, M, O, B, TxS, BS> ServiceCore for CarnotConsensus<A, P, M, O, B, TxS, BS>
+impl<A, P, M, O, C, TxS, BS> ServiceCore for CarnotConsensus<A, P, M, O, C, TxS, BS>
 where
     A: NetworkAdapter + Clone + Send + Sync + 'static,
     P: MemPool + Send + Sync + 'static,
@@ -152,14 +152,23 @@ where
     P::Tx:
         Debug + Clone + Eq + Hash + Serialize + serde::de::DeserializeOwned + Send + Sync + 'static,
     <P::Tx as Transaction>::Hash: Debug + Send + Sync,
-    B: Blob + Debug + Clone + Eq + Hash + Serialize + DeserializeOwned + Send + Sync + 'static,
+    C: Certificate
+        + Debug
+        + Clone
+        + Eq
+        + Hash
+        + Serialize
+        + DeserializeOwned
+        + Send
+        + Sync
+        + 'static,
     M: MempoolAdapter<Tx = P::Tx> + Send + Sync + 'static,
     O: Overlay + Debug + Send + Sync + 'static,
     O::LeaderSelection: UpdateableLeaderSelection,
     O::CommitteeMembership: UpdateableCommitteeMembership,
     TxS: TxSelect<Tx = P::Tx> + Clone + Send + Sync + 'static,
     TxS::Settings: Send + Sync + 'static,
-    BS: BlobSelect<Blob = B> + Clone + Send + Sync + 'static,
+    BS: BlobCertificateSelect<Certificate = C> + Clone + Send + Sync + 'static,
     BS::Settings: Send + Sync + 'static,
 {
     fn init(service_state: ServiceStateHandle<Self>) -> Result<Self, overwatch_rs::DynError> {
@@ -169,7 +178,7 @@ where
             service_state,
             network_relay,
             _overlay: Default::default(),
-            _blob: Default::default(),
+            _blob_certificate: Default::default(),
             mempool_relay,
         })
     }
@@ -286,13 +295,17 @@ where
 
 #[derive(Debug)]
 #[allow(clippy::large_enum_variant)]
-enum Output<Tx: Clone + Eq + Hash, Blob: Clone + Eq + Hash> {
+enum Output<Tx: Clone + Eq + Hash, BlobCertificate: Clone + Eq + Hash> {
     Send(consensus_engine::Send),
-    BroadcastTimeoutQc { timeout_qc: TimeoutQc },
-    BroadcastProposal { proposal: Block<Tx, Blob> },
+    BroadcastTimeoutQc {
+        timeout_qc: TimeoutQc,
+    },
+    BroadcastProposal {
+        proposal: Block<Tx, BlobCertificate>,
+    },
 }
 
-impl<A, P, M, O, B, TxS, BS> CarnotConsensus<A, P, M, O, B, TxS, BS>
+impl<A, P, M, O, C, TxS, BS> CarnotConsensus<A, P, M, O, C, TxS, BS>
 where
     A: NetworkAdapter + Clone + Send + Sync + 'static,
     P: MemPool + Send + Sync + 'static,
@@ -300,13 +313,22 @@ where
     P::Tx:
         Debug + Clone + Eq + Hash + Serialize + serde::de::DeserializeOwned + Send + Sync + 'static,
     <P::Tx as Transaction>::Hash: Debug + Send + Sync,
-    B: Blob + Debug + Clone + Eq + Hash + Serialize + DeserializeOwned + Send + Sync + 'static,
+    C: Certificate
+        + Debug
+        + Clone
+        + Eq
+        + Hash
+        + Serialize
+        + DeserializeOwned
+        + Send
+        + Sync
+        + 'static,
     M: MempoolAdapter<Tx = P::Tx> + Send + Sync + 'static,
     O: Overlay + Debug + Send + Sync + 'static,
     O::LeaderSelection: UpdateableLeaderSelection,
     O::CommitteeMembership: UpdateableCommitteeMembership,
     TxS: TxSelect<Tx = P::Tx> + Clone + Send + Sync + 'static,
-    BS: BlobSelect<Blob = B> + Clone + Send + Sync + 'static,
+    BS: BlobCertificateSelect<Certificate = C> + Clone + Send + Sync + 'static,
 {
     fn process_message(carnot: &Carnot<O>, msg: ConsensusMsg) {
         match msg {
@@ -330,8 +352,8 @@ where
     #[allow(clippy::too_many_arguments)]
     async fn process_carnot_event(
         mut carnot: Carnot<O>,
-        event: Event<P::Tx, B>,
-        task_manager: &mut TaskManager<View, Event<P::Tx, B>>,
+        event: Event<P::Tx, C>,
+        task_manager: &mut TaskManager<View, Event<P::Tx, C>>,
         adapter: A,
         private_key: PrivateKey,
         mempool_relay: OutboundRelay<MempoolMsg<P::Tx>>,
@@ -350,7 +372,7 @@ where
                 tracing::debug!("approving proposal {:?}", block);
                 let (new_carnot, out) = carnot.approve_block(block);
                 carnot = new_carnot;
-                output = Some(Output::Send::<P::Tx, B>(out));
+                output = Some(Output::Send::<P::Tx, C>(out));
             }
             Event::LocalTimeout { view } => {
                 tracing::debug!("local timeout");
@@ -420,11 +442,11 @@ where
     #[instrument(level = "debug", skip(adapter, task_manager, stream))]
     async fn process_block(
         mut carnot: Carnot<O>,
-        block: Block<P::Tx, B>,
-        mut stream: Pin<Box<dyn Stream<Item = Block<P::Tx, B>> + Send>>,
-        task_manager: &mut TaskManager<View, Event<P::Tx, B>>,
+        block: Block<P::Tx, C>,
+        mut stream: Pin<Box<dyn Stream<Item = Block<P::Tx, C>> + Send>>,
+        task_manager: &mut TaskManager<View, Event<P::Tx, C>>,
         adapter: A,
-    ) -> (Carnot<O>, Option<Output<P::Tx, B>>) {
+    ) -> (Carnot<O>, Option<Output<P::Tx, C>>) {
         tracing::debug!("received proposal {:?}", block);
         if carnot.highest_voted_view() >= block.header().view {
             tracing::debug!("already voted for view {}", block.header().view);
@@ -500,9 +522,9 @@ where
         carnot: Carnot<O>,
         timeout_qc: TimeoutQc,
         new_views: HashSet<NewView>,
-        task_manager: &mut TaskManager<View, Event<P::Tx, B>>,
+        task_manager: &mut TaskManager<View, Event<P::Tx, C>>,
         adapter: A,
-    ) -> (Carnot<O>, Option<Output<P::Tx, B>>) {
+    ) -> (Carnot<O>, Option<Output<P::Tx, C>>) {
         let leader_committee = [carnot.id()].into_iter().collect();
         let leader_tally_settings = CarnotTallySettings {
             threshold: carnot.leader_super_majority_threshold(),
@@ -537,9 +559,9 @@ where
     async fn receive_timeout_qc(
         carnot: Carnot<O>,
         timeout_qc: TimeoutQc,
-        task_manager: &mut TaskManager<View, Event<P::Tx, B>>,
+        task_manager: &mut TaskManager<View, Event<P::Tx, C>>,
         adapter: A,
-    ) -> (Carnot<O>, Option<Output<P::Tx, B>>) {
+    ) -> (Carnot<O>, Option<Output<P::Tx, C>>) {
         let mut new_state = carnot.receive_timeout_qc(timeout_qc.clone());
         let self_committee = carnot.self_committee();
         let tally_settings = CarnotTallySettings {
@@ -564,7 +586,7 @@ where
     async fn process_root_timeout(
         carnot: Carnot<O>,
         timeouts: HashSet<Timeout>,
-    ) -> (Carnot<O>, Option<Output<P::Tx, B>>) {
+    ) -> (Carnot<O>, Option<Output<P::Tx, C>>) {
         // we might have received a timeout_qc sent by some other node and advanced the view
         // already, in which case we should ignore the timeout
         if carnot.current_view()
@@ -609,7 +631,7 @@ where
         tx_selector: TxS,
         blob_selector: BS,
         mempool_relay: OutboundRelay<MempoolMsg<P::Tx>>,
-    ) -> Option<Output<P::Tx, B>> {
+    ) -> Option<Output<P::Tx, C>> {
         let (reply_channel, rx) = tokio::sync::oneshot::channel();
         let mut output = None;
         mempool_relay
@@ -629,7 +651,7 @@ where
                     .with_proposer(id)
                     .with_beacon_state(beacon)
                     .with_transactions(txs)
-                    .with_blobs([].into_iter())
+                    .with_blobs_certificates([].into_iter())
                     .build()
                 else {
                     panic!("Proposal block should always succeed to be built")
@@ -644,7 +666,7 @@ where
     async fn process_view_change(
         carnot: Carnot<O>,
         prev_view: View,
-        task_manager: &mut TaskManager<View, Event<P::Tx, B>>,
+        task_manager: &mut TaskManager<View, Event<P::Tx, C>>,
         adapter: A,
         timeout: Duration,
     ) {
@@ -681,7 +703,7 @@ where
         }
     }
 
-    async fn gather_timeout_qc(adapter: A, view: consensus_engine::View) -> Event<P::Tx, B> {
+    async fn gather_timeout_qc(adapter: A, view: consensus_engine::View) -> Event<P::Tx, C> {
         if let Some(timeout_qc) = adapter
             .timeout_qc_stream(view)
             .await
@@ -701,7 +723,7 @@ where
         committee: Committee,
         block: consensus_engine::Block,
         tally: CarnotTallySettings,
-    ) -> Event<P::Tx, B> {
+    ) -> Event<P::Tx, C> {
         let tally = CarnotTally::new(tally);
         let votes_stream = adapter.votes_stream(&committee, block.view, block.id).await;
         match tally.tally(block.clone(), votes_stream).await {
@@ -718,7 +740,7 @@ where
         committee: Committee,
         timeout_qc: TimeoutQc,
         tally: CarnotTallySettings,
-    ) -> Event<P::Tx, B> {
+    ) -> Event<P::Tx, C> {
         let tally = NewViewTally::new(tally);
         let stream = adapter
             .new_view_stream(&committee, timeout_qc.view().next())
@@ -740,7 +762,7 @@ where
         committee: Committee,
         view: consensus_engine::View,
         tally: CarnotTallySettings,
-    ) -> Event<P::Tx, B> {
+    ) -> Event<P::Tx, C> {
         let tally = TimeoutTally::new(tally);
         let stream = adapter.timeout_stream(&committee, view).await;
         match tally.tally(view, stream).await {
@@ -752,7 +774,7 @@ where
     }
 
     #[instrument(level = "debug", skip(adapter))]
-    async fn gather_block(adapter: A, view: consensus_engine::View) -> Event<P::Tx, B> {
+    async fn gather_block(adapter: A, view: consensus_engine::View) -> Event<P::Tx, C> {
         let stream = adapter
             .proposal_chunks_stream(view)
             .await
@@ -814,11 +836,11 @@ where
     }
 }
 
-async fn handle_output<A, Tx, B>(adapter: &A, node_id: NodeId, output: Output<Tx, B>)
+async fn handle_output<A, Tx, C>(adapter: &A, node_id: NodeId, output: Output<Tx, C>)
 where
     A: NetworkAdapter,
     Tx: Hash + Eq + Clone + Serialize + DeserializeOwned + Debug,
-    B: Clone + Eq + Hash + Serialize + DeserializeOwned,
+    C: Clone + Eq + Hash + Serialize + DeserializeOwned,
 {
     match output {
         Output::Send(consensus_engine::Send { to, payload }) => match payload {
@@ -878,10 +900,10 @@ where
 }
 
 #[allow(clippy::large_enum_variant)]
-enum Event<Tx: Clone + Hash + Eq, Blob: Clone + Eq + Hash> {
+enum Event<Tx: Clone + Hash + Eq, BlobCertificate: Clone + Eq + Hash> {
     Proposal {
-        block: Block<Tx, Blob>,
-        stream: Pin<Box<dyn Stream<Item = Block<Tx, Blob>> + Send>>,
+        block: Block<Tx, BlobCertificate>,
+        stream: Pin<Box<dyn Stream<Item = Block<Tx, BlobCertificate>> + Send>>,
     },
     #[allow(dead_code)]
     Approve {