diff --git a/src/device.rs b/src/device.rs
index 713daa7..b7fab75 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -38,6 +38,10 @@ impl Device {
         &self.sp_wallet
     }
 
+    pub fn get_mut_sp_wallet(&mut self) -> &mut SpWallet {
+        &mut self.sp_wallet
+    }
+
     pub fn get_sp_client(&self) -> &SpClient {
         self.sp_wallet.get_sp_client()
     }
diff --git a/src/serialization.rs b/src/serialization.rs
index 2997daf..bd3fe9b 100644
--- a/src/serialization.rs
+++ b/src/serialization.rs
@@ -1,6 +1,6 @@
 use crate::{pcd::Member, process::Process};
 use serde::de::Error;
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use sp_client::bitcoin::hex::{DisplayHex, FromHex};
 use sp_client::bitcoin::OutPoint;
 use std::collections::{BTreeMap, HashMap};