diff --git a/nodes/nomos-node/src/api.rs b/nodes/nomos-node/src/api.rs
index 20e65903..f30770c8 100644
--- a/nodes/nomos-node/src/api.rs
+++ b/nodes/nomos-node/src/api.rs
@@ -53,7 +53,7 @@ pub struct AxumBackend<T, S, const SIZE: usize> {
         da_status,
     ),
     components(
-        schemas(Status, MempoolMetrics)
+        schemas(Status<BlockId>, MempoolMetrics)
     ),
     tags(
         (name = "da", description = "data availibility related APIs")
diff --git a/nodes/nomos-node/src/lib.rs b/nodes/nomos-node/src/lib.rs
index cebd8886..c8869744 100644
--- a/nodes/nomos-node/src/lib.rs
+++ b/nodes/nomos-node/src/lib.rs
@@ -15,6 +15,7 @@ use bytes::Bytes;
 use carnot_consensus::CarnotConsensus;
 use nomos_api::ApiService;
 use nomos_core::{
+    block::BlockId,
     da::{blob, certificate},
     tx::Transaction,
     wire,
@@ -58,9 +59,13 @@ const MB16: usize = 1024 * 1024 * 16;
 
 pub type Carnot = CarnotConsensus<
     ConsensusLibp2pAdapter,
-    MockPool<Tx, <Tx as Transaction>::Hash>,
+    MockPool<BlockId, Tx, <Tx as Transaction>::Hash>,
     MempoolLibp2pAdapter<Tx, <Tx as Transaction>::Hash>,
-    MockPool<Certificate, <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash>,
+    MockPool<
+        BlockId,
+        Certificate,
+        <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash,
+    >,
     MempoolLibp2pAdapter<
         Certificate,
         <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash,
@@ -77,7 +82,7 @@ pub type DataAvailability = DataAvailabilityService<
     DaLibp2pAdapter<Blob, Attestation>,
 >;
 
-type Mempool<K, V, D> = MempoolService<MempoolLibp2pAdapter<K, V>, MockPool<K, V>, D>;
+type Mempool<K, V, D> = MempoolService<MempoolLibp2pAdapter<K, V>, MockPool<BlockId, K, V>, D>;
 
 #[derive(Services)]
 pub struct Nomos {
diff --git a/nomos-services/api/src/http/cl.rs b/nomos-services/api/src/http/cl.rs
index add0cddd..d0bc8437 100644
--- a/nomos-services/api/src/http/cl.rs
+++ b/nomos-services/api/src/http/cl.rs
@@ -1,5 +1,6 @@
 use core::{fmt::Debug, hash::Hash};
 
+use nomos_core::block::BlockId;
 use nomos_core::tx::Transaction;
 use nomos_mempool::{
     backend::mockpool::MockPool,
@@ -12,7 +13,7 @@ use tokio::sync::oneshot;
 
 type ClMempoolService<T> = MempoolService<
     Libp2pAdapter<T, <T as Transaction>::Hash>,
-    MockPool<T, <T as Transaction>::Hash>,
+    MockPool<BlockId, T, <T as Transaction>::Hash>,
     TxDiscriminant,
 >;
 
@@ -46,7 +47,7 @@ where
 pub async fn cl_mempool_status<T>(
     handle: &overwatch_rs::overwatch::handle::OverwatchHandle,
     items: Vec<<T as Transaction>::Hash>,
-) -> Result<Vec<Status>, super::DynError>
+) -> Result<Vec<Status<BlockId>>, super::DynError>
 where
     T: Transaction
         + Clone
diff --git a/nomos-services/api/src/http/consensus.rs b/nomos-services/api/src/http/consensus.rs
index a858ebff..1655ae89 100644
--- a/nomos-services/api/src/http/consensus.rs
+++ b/nomos-services/api/src/http/consensus.rs
@@ -27,9 +27,13 @@ use nomos_storage::backends::{sled::SledBackend, StorageSerde};
 
 pub type Carnot<Tx, SS, const SIZE: usize> = CarnotConsensus<
     ConsensusLibp2pAdapter,
-    MockPool<Tx, <Tx as Transaction>::Hash>,
+    MockPool<BlockId, Tx, <Tx as Transaction>::Hash>,
     MempoolLibp2pAdapter<Tx, <Tx as Transaction>::Hash>,
-    MockPool<Certificate, <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash>,
+    MockPool<
+        BlockId,
+        Certificate,
+        <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash,
+    >,
     MempoolLibp2pAdapter<
         Certificate,
         <<Certificate as certificate::Certificate>::Blob as blob::Blob>::Hash,
diff --git a/nomos-services/api/src/http/da.rs b/nomos-services/api/src/http/da.rs
index 918bb854..b8bc12a7 100644
--- a/nomos-services/api/src/http/da.rs
+++ b/nomos-services/api/src/http/da.rs
@@ -1,4 +1,5 @@
 use full_replication::{AbsoluteNumber, Attestation, Blob, Certificate, FullReplication};
+use nomos_core::block::BlockId;
 use nomos_core::da::blob;
 use nomos_da::{
     backend::memory_cache::BlobCache, network::adapters::libp2p::Libp2pAdapter as DaLibp2pAdapter,
@@ -14,7 +15,7 @@ use tokio::sync::oneshot;
 
 pub type DaMempoolService = MempoolService<
     Libp2pAdapter<Certificate, <Blob as blob::Blob>::Hash>,
-    MockPool<Certificate, <Blob as blob::Blob>::Hash>,
+    MockPool<BlockId, Certificate, <Blob as blob::Blob>::Hash>,
     CertDiscriminant,
 >;
 
@@ -42,7 +43,7 @@ pub async fn da_mempool_metrics(
 pub async fn da_mempool_status(
     handle: &overwatch_rs::overwatch::handle::OverwatchHandle,
     items: Vec<<Blob as blob::Blob>::Hash>,
-) -> Result<Vec<Status>, super::DynError> {
+) -> Result<Vec<Status<BlockId>>, super::DynError> {
     let relay = handle.relay::<DaMempoolService>().connect().await?;
     let (sender, receiver) = oneshot::channel();
     relay
diff --git a/nomos-services/api/src/http/mempool.rs b/nomos-services/api/src/http/mempool.rs
index 67e4bfb8..9d9c3c3d 100644
--- a/nomos-services/api/src/http/mempool.rs
+++ b/nomos-services/api/src/http/mempool.rs
@@ -1,5 +1,5 @@
 use core::{fmt::Debug, hash::Hash};
-
+use nomos_core::block::BlockId;
 use nomos_mempool::{
     backend::mockpool::MockPool, network::NetworkAdapter, Discriminant, MempoolMsg, MempoolService,
 };
@@ -20,7 +20,7 @@ where
     Key: Clone + Debug + Ord + Hash + 'static,
 {
     let relay = handle
-        .relay::<MempoolService<A, MockPool<Item, Key>, D>>()
+        .relay::<MempoolService<A, MockPool<BlockId, Item, Key>, D>>()
         .connect()
         .await?;
     let (sender, receiver) = oneshot::channel();
diff --git a/nomos-services/carnot-consensus/src/lib.rs b/nomos-services/carnot-consensus/src/lib.rs
index 9c51862f..8e2cf48f 100644
--- a/nomos-services/carnot-consensus/src/lib.rs
+++ b/nomos-services/carnot-consensus/src/lib.rs
@@ -113,8 +113,8 @@ pub struct CarnotConsensus<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, T
 where
     A: NetworkAdapter,
     ClPoolAdapter: MempoolAdapter<Item = ClPool::Item, Key = ClPool::Key>,
-    ClPool: MemPool,
-    DaPool: MemPool,
+    ClPool: MemPool<BlockId = BlockId>,
+    DaPool: MemPool<BlockId = BlockId>,
     DaPoolAdapter: MempoolAdapter<Item = DaPool::Item, Key = DaPool::Key>,
     O: Overlay + Debug,
     ClPool::Item: Debug + 'static,
@@ -140,10 +140,10 @@ impl<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage> Servi
     for CarnotConsensus<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage>
 where
     A: NetworkAdapter,
-    ClPool: MemPool,
+    ClPool: MemPool<BlockId = BlockId>,
     ClPool::Item: Debug,
     ClPool::Key: Debug,
-    DaPool: MemPool,
+    DaPool: MemPool<BlockId = BlockId>,
     DaPool::Item: Debug,
     DaPool::Key: Debug,
     ClPoolAdapter: MempoolAdapter<Item = ClPool::Item, Key = ClPool::Key>,
@@ -165,9 +165,9 @@ impl<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage> Servi
     for CarnotConsensus<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage>
 where
     A: NetworkAdapter + Clone + Send + Sync + 'static,
-    ClPool: MemPool + Send + Sync + 'static,
+    ClPool: MemPool<BlockId = BlockId> + Send + Sync + 'static,
     ClPool::Settings: Send + Sync + 'static,
-    DaPool: MemPool + Send + Sync + 'static,
+    DaPool: MemPool<BlockId = BlockId> + Send + Sync + 'static,
     DaPool::Settings: Send + Sync + 'static,
     ClPool::Item: Transaction<Hash = ClPool::Key>
         + Debug
@@ -364,9 +364,9 @@ impl<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage>
     CarnotConsensus<A, ClPool, ClPoolAdapter, DaPool, DaPoolAdapter, O, TxS, BS, Storage>
 where
     A: NetworkAdapter + Clone + Send + Sync + 'static,
-    ClPool: MemPool + Send + Sync + 'static,
+    ClPool: MemPool<BlockId = BlockId> + Send + Sync + 'static,
     ClPool::Settings: Send + Sync + 'static,
-    DaPool: MemPool + Send + Sync + 'static,
+    DaPool: MemPool<BlockId = BlockId> + Send + Sync + 'static,
     DaPool::Settings: Send + Sync + 'static,
     ClPool::Item: Transaction<Hash = ClPool::Key>
         + Debug
@@ -462,8 +462,8 @@ where
         task_manager: &mut TaskManager<View, Event<ClPool::Item, DaPool::Item>>,
         adapter: A,
         private_key: PrivateKey,
-        cl_mempool_relay: OutboundRelay<MempoolMsg<ClPool::Item, ClPool::Key>>,
-        da_mempool_relay: OutboundRelay<MempoolMsg<DaPool::Item, DaPool::Key>>,
+        cl_mempool_relay: OutboundRelay<MempoolMsg<BlockId, ClPool::Item, ClPool::Key>>,
+        da_mempool_relay: OutboundRelay<MempoolMsg<BlockId, DaPool::Item, DaPool::Key>>,
         storage_relay: OutboundRelay<StorageMsg<Storage>>,
         tx_selector: TxS,
         blobl_selector: BS,
@@ -577,8 +577,8 @@ where
         task_manager: &mut TaskManager<View, Event<ClPool::Item, DaPool::Item>>,
         adapter: A,
         storage_relay: OutboundRelay<StorageMsg<Storage>>,
-        cl_mempool_relay: OutboundRelay<MempoolMsg<ClPool::Item, ClPool::Key>>,
-        da_mempool_relay: OutboundRelay<MempoolMsg<DaPool::Item, DaPool::Key>>,
+        cl_mempool_relay: OutboundRelay<MempoolMsg<BlockId, ClPool::Item, ClPool::Key>>,
+        da_mempool_relay: OutboundRelay<MempoolMsg<BlockId, DaPool::Item, DaPool::Key>>,
     ) -> (Carnot<O>, Option<Output<ClPool::Item, DaPool::Item>>) {
         tracing::debug!("received proposal {:?}", block);
         if carnot.highest_voted_view() >= block.header().view {
@@ -793,8 +793,8 @@ where
         qc: Qc,
         tx_selector: TxS,
         blob_selector: BS,
-        cl_mempool_relay: OutboundRelay<MempoolMsg<ClPool::Item, ClPool::Key>>,
-        da_mempool_relay: OutboundRelay<MempoolMsg<DaPool::Item, DaPool::Key>>,
+        cl_mempool_relay: OutboundRelay<MempoolMsg<BlockId, ClPool::Item, ClPool::Key>>,
+        da_mempool_relay: OutboundRelay<MempoolMsg<BlockId, DaPool::Item, DaPool::Key>>,
     ) -> Option<Output<ClPool::Item, DaPool::Item>> {
         let mut output = None;
         let cl_txs = get_mempool_contents(cl_mempool_relay);
@@ -1127,7 +1127,7 @@ pub struct CarnotInfo {
 }
 
 async fn get_mempool_contents<Item, Key>(
-    mempool: OutboundRelay<MempoolMsg<Item, Key>>,
+    mempool: OutboundRelay<MempoolMsg<BlockId, Item, Key>>,
 ) -> Result<Box<dyn Iterator<Item = Item> + Send>, tokio::sync::oneshot::error::RecvError> {
     let (reply_channel, rx) = tokio::sync::oneshot::channel();
 
@@ -1143,7 +1143,7 @@ async fn get_mempool_contents<Item, Key>(
 }
 
 async fn mark_in_block<Item, Key>(
-    mempool: OutboundRelay<MempoolMsg<Item, Key>>,
+    mempool: OutboundRelay<MempoolMsg<BlockId, Item, Key>>,
     ids: impl Iterator<Item = Key>,
     block: BlockId,
 ) {
diff --git a/nomos-services/mempool/src/backend/mockpool.rs b/nomos-services/mempool/src/backend/mockpool.rs
index f87e7b8a..6c1de925 100644
--- a/nomos-services/mempool/src/backend/mockpool.rs
+++ b/nomos-services/mempool/src/backend/mockpool.rs
@@ -6,19 +6,18 @@ use std::{collections::BTreeMap, time::UNIX_EPOCH};
 // crates
 // internal
 use crate::backend::{MemPool, MempoolError};
-use nomos_core::block::BlockId;
 
 use super::Status;
 
 /// A mock mempool implementation that stores all transactions in memory in the order received.
-pub struct MockPool<Item, Key> {
+pub struct MockPool<BlockId, Item, Key> {
     pending_items: LinkedHashMap<Key, Item>,
     in_block_items: BTreeMap<BlockId, Vec<Item>>,
     in_block_items_by_id: BTreeMap<Key, BlockId>,
     last_item_timestamp: u64,
 }
 
-impl<Item, Key> Default for MockPool<Item, Key>
+impl<BlockId, Item, Key> Default for MockPool<BlockId, Item, Key>
 where
     Key: Hash + Eq,
 {
@@ -32,7 +31,7 @@ where
     }
 }
 
-impl<Item, Key> MockPool<Item, Key>
+impl<BlockId, Item, Key> MockPool<BlockId, Item, Key>
 where
     Key: Hash + Eq + Clone,
 {
@@ -41,14 +40,16 @@ where
     }
 }
 
-impl<Item, Key> MemPool for MockPool<Item, Key>
+impl<BlockId, Item, Key> MemPool for MockPool<BlockId, Item, Key>
 where
     Item: Clone + Send + Sync + 'static + Hash,
     Key: Clone + Ord + Hash,
+    BlockId: Copy + Ord,
 {
     type Settings = ();
     type Item = Item;
     type Key = Key;
+    type BlockId = BlockId;
 
     fn new(_settings: Self::Settings) -> Self {
         Self::new()
@@ -108,7 +109,7 @@ where
         self.last_item_timestamp
     }
 
-    fn status(&self, items: &[Self::Key]) -> Vec<Status> {
+    fn status(&self, items: &[Self::Key]) -> Vec<Status<BlockId>> {
         items
             .iter()
             .map(|key| {
diff --git a/nomos-services/mempool/src/backend/mod.rs b/nomos-services/mempool/src/backend/mod.rs
index 727ef2a8..e97f25be 100644
--- a/nomos-services/mempool/src/backend/mod.rs
+++ b/nomos-services/mempool/src/backend/mod.rs
@@ -1,7 +1,6 @@
 #[cfg(feature = "mock")]
 pub mod mockpool;
 
-use nomos_core::block::BlockId;
 use serde::{Deserialize, Serialize};
 
 #[derive(thiserror::Error, Debug)]
@@ -16,6 +15,7 @@ pub trait MemPool {
     type Settings: Clone;
     type Item;
     type Key;
+    type BlockId;
 
     /// Construct a new empty pool
     fn new(settings: Self::Settings) -> Self;
@@ -28,14 +28,17 @@ pub trait MemPool {
     /// in a block.
     /// The hint on the ancestor *can* be used by the implementation to display additional
     /// items that were not included up to that point if available.
-    fn view(&self, ancestor_hint: BlockId) -> Box<dyn Iterator<Item = Self::Item> + Send>;
+    fn view(&self, ancestor_hint: Self::BlockId) -> Box<dyn Iterator<Item = Self::Item> + Send>;
 
     /// Record that a set of items were included in a block
-    fn mark_in_block(&mut self, items: &[Self::Key], block: BlockId);
+    fn mark_in_block(&mut self, items: &[Self::Key], block: Self::BlockId);
 
     /// Returns all of the transactions for the block
     #[cfg(test)]
-    fn block_items(&self, block: BlockId) -> Option<Box<dyn Iterator<Item = Self::Item> + Send>>;
+    fn block_items(
+        &self,
+        block: Self::BlockId,
+    ) -> Option<Box<dyn Iterator<Item = Self::Item> + Send>>;
 
     /// Signal that a set of transactions can't be possibly requested anymore and can be
     /// discarded.
@@ -46,12 +49,12 @@ pub trait MemPool {
 
     // Return the status of a set of items.
     // This is a best effort attempt, and implementations are free to return `Unknown` for all of them.
-    fn status(&self, items: &[Self::Key]) -> Vec<Status>;
+    fn status(&self, items: &[Self::Key]) -> Vec<Status<Self::BlockId>>;
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "openapi", derive(utoipa::ToSchema))]
-pub enum Status {
+pub enum Status<BlockId> {
     /// Unknown status
     Unknown,
     /// Pending status
diff --git a/nomos-services/mempool/src/lib.rs b/nomos-services/mempool/src/lib.rs
index 41eadb27..2f3ab4e0 100644
--- a/nomos-services/mempool/src/lib.rs
+++ b/nomos-services/mempool/src/lib.rs
@@ -24,7 +24,6 @@ use tokio::sync::oneshot::Sender;
 // internal
 use crate::network::NetworkAdapter;
 use backend::{MemPool, Status};
-use nomos_core::block::BlockId;
 use nomos_network::{NetworkMsg, NetworkService};
 use overwatch_rs::services::life_cycle::LifecycleMessage;
 use overwatch_rs::services::{
@@ -42,6 +41,7 @@ where
     P::Settings: Clone,
     P::Item: Debug + 'static,
     P::Key: Debug + 'static,
+    P::BlockId: Debug + 'static,
     D: Discriminant,
 {
     service_state: ServiceStateHandle<Self>,
@@ -63,7 +63,7 @@ pub struct MempoolMetrics {
     pub last_item_timestamp: u64,
 }
 
-pub enum MempoolMsg<Item, Key> {
+pub enum MempoolMsg<BlockId, Item, Key> {
     Add {
         item: Item,
         key: Key,
@@ -90,12 +90,13 @@ pub enum MempoolMsg<Item, Key> {
     },
     Status {
         items: Vec<Key>,
-        reply_channel: Sender<Vec<Status>>,
+        reply_channel: Sender<Vec<Status<BlockId>>>,
     },
 }
 
-impl<Item, Key> Debug for MempoolMsg<Item, Key>
+impl<BlockId, Item, Key> Debug for MempoolMsg<BlockId, Item, Key>
 where
+    BlockId: Debug,
     Item: Debug,
     Key: Debug,
 {
@@ -122,7 +123,10 @@ where
     }
 }
 
-impl<Item: 'static, Key: 'static> RelayMessage for MempoolMsg<Item, Key> {}
+impl<BlockId: 'static, Item: 'static, Key: 'static> RelayMessage
+    for MempoolMsg<BlockId, Item, Key>
+{
+}
 
 pub struct Transaction;
 pub struct Certificate;
@@ -146,13 +150,14 @@ where
     P::Settings: Clone,
     P::Item: Debug + 'static,
     P::Key: Debug + 'static,
+    P::BlockId: Debug + 'static,
     D: Discriminant,
 {
     const SERVICE_ID: ServiceId = D::ID;
     type Settings = Settings<P::Settings, N::Settings>;
     type State = NoState<Self::Settings>;
     type StateOperator = NoOperator<Self::State>;
-    type Message = MempoolMsg<<P as MemPool>::Item, <P as MemPool>::Key>;
+    type Message = MempoolMsg<<P as MemPool>::BlockId, <P as MemPool>::Item, <P as MemPool>::Key>;
 }
 
 #[async_trait::async_trait]
@@ -163,6 +168,7 @@ where
     N::Settings: Clone + Send + Sync + 'static,
     P::Item: Clone + Debug + Send + Sync + 'static,
     P::Key: Debug + Send + Sync + 'static,
+    P::BlockId: Send + Debug + 'static,
     N: NetworkAdapter<Item = P::Item, Key = P::Key> + Send + Sync + 'static,
     D: Discriminant + Send,
 {
@@ -237,6 +243,7 @@ where
     N::Settings: Clone + Send + Sync + 'static,
     P::Item: Clone + Debug + Send + Sync + 'static,
     P::Key: Debug + Send + Sync + 'static,
+    P::BlockId: Debug + Send + 'static,
     N: NetworkAdapter<Item = P::Item, Key = P::Key> + Send + Sync + 'static,
     D: Discriminant + Send,
 {
@@ -256,7 +263,7 @@ where
     }
 
     async fn handle_mempool_message(
-        message: MempoolMsg<P::Item, P::Key>,
+        message: MempoolMsg<P::BlockId, P::Item, P::Key>,
         pool: &mut P,
         network_relay: &mut OutboundRelay<NetworkMsg<N::Backend>>,
         service_state: &mut ServiceStateHandle<Self>,
diff --git a/nomos-services/mempool/src/metrics.rs b/nomos-services/mempool/src/metrics.rs
index 6073d818..02825ea5 100644
--- a/nomos-services/mempool/src/metrics.rs
+++ b/nomos-services/mempool/src/metrics.rs
@@ -18,12 +18,12 @@ enum MempoolMsgType {
     MarkInBlock,
 }
 
-impl<I, K> From<&MempoolMsg<I, K>> for MempoolMsgType
+impl<BlockId, I, K> From<&MempoolMsg<BlockId, I, K>> for MempoolMsgType
 where
     I: 'static + Debug,
     K: 'static + Debug,
 {
-    fn from(event: &MempoolMsg<I, K>) -> Self {
+    fn from(event: &MempoolMsg<BlockId, I, K>) -> Self {
         match event {
             MempoolMsg::Add { .. } => MempoolMsgType::Add,
             MempoolMsg::View { .. } => MempoolMsgType::View,
@@ -60,7 +60,7 @@ impl Metrics {
         Self { messages }
     }
 
-    pub(crate) fn record<I, K>(&self, msg: &MempoolMsg<I, K>)
+    pub(crate) fn record<BlockId, I, K>(&self, msg: &MempoolMsg<BlockId, I, K>)
     where
         I: 'static + Debug,
         K: 'static + Debug,
diff --git a/nomos-services/mempool/tests/mock.rs b/nomos-services/mempool/tests/mock.rs
index c86bed99..5024a640 100644
--- a/nomos-services/mempool/tests/mock.rs
+++ b/nomos-services/mempool/tests/mock.rs
@@ -21,7 +21,11 @@ struct MockPoolNode {
     logging: ServiceHandle<Logger>,
     network: ServiceHandle<NetworkService<Mock>>,
     mockpool: ServiceHandle<
-        MempoolService<MockAdapter, MockPool<MockTransaction<MockMessage>, MockTxId>, Transaction>,
+        MempoolService<
+            MockAdapter,
+            MockPool<BlockId, MockTransaction<MockMessage>, MockTxId>,
+            Transaction,
+        >,
     >,
 }
 
@@ -76,7 +80,7 @@ fn test_mockmempool() {
     let network = app.handle().relay::<NetworkService<Mock>>();
     let mempool = app.handle().relay::<MempoolService<
         MockAdapter,
-        MockPool<MockTransaction<MockMessage>, MockTxId>,
+        MockPool<BlockId, MockTransaction<MockMessage>, MockTxId>,
         Transaction,
     >>();