diff --git a/pkg/core/interop_neo.go b/pkg/core/interop_neo.go
index a8ed517e5..7140b1fa2 100644
--- a/pkg/core/interop_neo.go
+++ b/pkg/core/interop_neo.go
@@ -60,7 +60,7 @@ func (ic *interopContext) headerGetMerkleRoot(v *vm.VM) error {
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(header.MerkleRoot.BytesLE())
+	v.Estack().PushVal(header.MerkleRoot.BytesBE())
 	return nil
 }
 
@@ -70,7 +70,7 @@ func (ic *interopContext) headerGetNextConsensus(v *vm.VM) error {
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(header.NextConsensus.BytesLE())
+	v.Estack().PushVal(header.NextConsensus.BytesBE())
 	return nil
 }
 
diff --git a/pkg/core/interop_neo_test.go b/pkg/core/interop_neo_test.go
index e83d012b9..e701c94d2 100644
--- a/pkg/core/interop_neo_test.go
+++ b/pkg/core/interop_neo_test.go
@@ -147,7 +147,7 @@ func TestHeaderGetMerkleRoot(t *testing.T) {
 	err := context.headerGetMerkleRoot(v)
 	require.NoError(t, err)
 	value := v.Estack().Pop().Value()
-	require.Equal(t, block.MerkleRoot.BytesLE(), value)
+	require.Equal(t, block.MerkleRoot.BytesBE(), value)
 }
 
 func TestHeaderGetNextConsensus(t *testing.T) {
@@ -157,7 +157,7 @@ func TestHeaderGetNextConsensus(t *testing.T) {
 	err := context.headerGetNextConsensus(v)
 	require.NoError(t, err)
 	value := v.Estack().Pop().Value()
-	require.Equal(t, block.NextConsensus.BytesLE(), value)
+	require.Equal(t, block.NextConsensus.BytesBE(), value)
 }
 
 func TestTxGetAttributes(t *testing.T) {
diff --git a/pkg/core/interop_system.go b/pkg/core/interop_system.go
index 81ea87299..59dcbc72a 100644
--- a/pkg/core/interop_system.go
+++ b/pkg/core/interop_system.go
@@ -41,7 +41,7 @@ func getBlockHashFromElement(bc Blockchainer, element *vm.Element) (util.Uint256
 		}
 		hash = bc.GetHeaderHash(int(hashint))
 	} else {
-		return util.Uint256DecodeBytesLE(hashbytes)
+		return util.Uint256DecodeBytesBE(hashbytes)
 	}
 	return hash, nil
 }
@@ -102,7 +102,7 @@ func (ic *interopContext) bcGetHeight(v *vm.VM) error {
 // returns transaction and its height if it's present in the blockchain.
 func getTransactionAndHeight(cd *cachedDao, v *vm.VM) (*transaction.Transaction, uint32, error) {
 	hashbytes := v.Estack().Pop().Bytes()
-	hash, err := util.Uint256DecodeBytesLE(hashbytes)
+	hash, err := util.Uint256DecodeBytesBE(hashbytes)
 	if err != nil {
 		return nil, 0, err
 	}
@@ -161,7 +161,7 @@ func (ic *interopContext) headerGetHash(v *vm.VM) error {
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(header.Hash().BytesLE())
+	v.Estack().PushVal(header.Hash().BytesBE())
 	return nil
 }
 
@@ -171,7 +171,7 @@ func (ic *interopContext) headerGetPrevHash(v *vm.VM) error {
 	if err != nil {
 		return err
 	}
-	v.Estack().PushVal(header.PrevHash.BytesLE())
+	v.Estack().PushVal(header.PrevHash.BytesBE())
 	return nil
 }
 
@@ -238,7 +238,7 @@ func (ic *interopContext) txGetHash(v *vm.VM) error {
 	if !ok {
 		return errors.New("value is not a transaction")
 	}
-	v.Estack().PushVal(tx.Hash().BytesLE())
+	v.Estack().PushVal(tx.Hash().BytesBE())
 	return nil
 }