diff --git a/common/mixnet-contract/src/delegation.rs b/common/mixnet-contract/src/delegation.rs
index 5aab311db5..023472bb02 100644
--- a/common/mixnet-contract/src/delegation.rs
+++ b/common/mixnet-contract/src/delegation.rs
@@ -26,11 +26,16 @@ impl RawDelegationData {
 pub struct Delegation {
     owner: Addr,
     amount: Coin,
+    block_height: u64,
 }
 
 impl Delegation {
-    pub fn new(owner: Addr, amount: Coin) -> Self {
-        Delegation { owner, amount }
+    pub fn new(owner: Addr, amount: Coin, block_height: u64) -> Self {
+        Delegation {
+            owner,
+            amount,
+            block_height,
+        }
     }
 
     pub fn amount(&self) -> &Coin {
@@ -46,8 +51,8 @@ impl Display for Delegation {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         write!(
             f,
-            "{} {} delegated by {}",
-            self.amount.amount, self.amount.denom, self.owner
+            "{} {} delegated by {} at block {}",
+            self.amount.amount, self.amount.denom, self.owner, self.block_height
         )
     }
 }
diff --git a/contracts/mixnet/src/contract.rs b/contracts/mixnet/src/contract.rs
index 62cd403093..1d22196037 100644
--- a/contracts/mixnet/src/contract.rs
+++ b/contracts/mixnet/src/contract.rs
@@ -245,6 +245,8 @@ pub fn migrate(deps: DepsMut, env: Env, _msg: MigrateMsg) -> Result<Response, Co
                             "Non-UTF8 address used as key in bucket. The storage is corrupted!",
                         )),
                         coin(entry.1.u128(), DENOM),
+                        // dummy data, used as a placeholder in the context of migration
+                        42,
                     )
                 })
             })
@@ -280,6 +282,8 @@ pub fn migrate(deps: DepsMut, env: Env, _msg: MigrateMsg) -> Result<Response, Co
                             "Non-UTF8 address used as key in bucket. The storage is corrupted!",
                         )),
                         coin(entry.1.u128(), DENOM),
+                        // dummy data, used as a placeholder in the context of migration
+                        42,
                     )
                 })
             })
diff --git a/contracts/mixnet/src/queries.rs b/contracts/mixnet/src/queries.rs
index beba0b63e9..535b3beb71 100644
--- a/contracts/mixnet/src/queries.rs
+++ b/contracts/mixnet/src/queries.rs
@@ -129,6 +129,7 @@ pub(crate) fn query_mixnode_delegations_paged(
                         "Non-UTF8 address used as key in bucket. The storage is corrupted!",
                     )),
                     coin(entry.1.amount.u128(), DENOM),
+                    entry.1.block_height,
                 )
             })
         })
@@ -184,6 +185,7 @@ pub(crate) fn query_mixnode_delegation(
         Some(delegation_value) => Ok(Delegation::new(
             address,
             coin(delegation_value.amount.u128(), DENOM),
+            delegation_value.block_height,
         )),
         None => Err(ContractError::NoMixnodeDelegationFound {
             identity: mix_identity,
@@ -213,6 +215,7 @@ pub(crate) fn query_gateway_delegations_paged(
                         "Non-UTF8 address used as key in bucket. The storage is corrupted!",
                     )),
                     coin(entry.1.amount.u128(), DENOM),
+                    entry.1.block_height,
                 )
             })
         })
@@ -268,6 +271,7 @@ pub(crate) fn query_gateway_delegation(
         Some(delegation_value) => Ok(Delegation::new(
             address,
             coin(delegation_value.amount.u128(), DENOM),
+            delegation_value.block_height,
         )),
         None => Err(ContractError::NoGatewayDelegationFound {
             identity: gateway_identity,
@@ -288,7 +292,7 @@ mod tests {
     use crate::transactions;
     use cosmwasm_std::testing::mock_info;
     use cosmwasm_std::{Addr, Storage};
-    use mixnet_contract::{Gateway, MixNode};
+    use mixnet_contract::{Gateway, MixNode, RawDelegationData};
 
     #[test]
     fn mixnodes_empty_on_init() {
@@ -793,11 +797,18 @@ mod tests {
         let delegation_owner = Addr::unchecked("bar");
 
         mix_delegations(&mut deps.storage, &node_identity)
-            .save(delegation_owner.as_bytes(), &raw_delegation_fixture(42))
+            .save(
+                delegation_owner.as_bytes(),
+                &RawDelegationData::new(42u128.into(), 12_345),
+            )
             .unwrap();
 
         assert_eq!(
-            Ok(Delegation::new(delegation_owner.clone(), coin(42, DENOM))),
+            Ok(Delegation::new(
+                delegation_owner.clone(),
+                coin(42, DENOM),
+                12_345
+            )),
             query_mixnode_delegation(deps.as_ref(), node_identity, delegation_owner)
         )
     }
@@ -1178,11 +1189,18 @@ mod tests {
         let delegation_owner = Addr::unchecked("bar");
 
         gateway_delegations(&mut deps.storage, &node_identity)
-            .save(delegation_owner.as_bytes(), &raw_delegation_fixture(42))
+            .save(
+                delegation_owner.as_bytes(),
+                &&RawDelegationData::new(42u128.into(), 12_345),
+            )
             .unwrap();
 
         assert_eq!(
-            Ok(Delegation::new(delegation_owner.clone(), coin(42, DENOM))),
+            Ok(Delegation::new(
+                delegation_owner.clone(),
+                coin(42, DENOM),
+                12_345
+            )),
             query_gateway_delegation(deps.as_ref(), node_identity, delegation_owner)
         )
     }