diff --git a/src/api.rs b/src/api.rs
index 22d958f..1af5849 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -76,6 +76,30 @@ use sdk_common::secrets::SecretsStore;
 use crate::user::{lock_local_device, set_new_device, LOCAL_DEVICE};
 use crate::wallet::{generate_sp_wallet, lock_freezed_utxos};
 
+#[derive(Debug, PartialEq, Tsify, Serialize, Deserialize, Default)]
+#[tsify(into_wasm_abi)]
+#[allow(non_camel_case_types)]
+pub enum DiffStatus {
+    #[default]
+    None,
+    Rejected,
+    Validated,
+}
+
+#[derive(Debug, PartialEq, Tsify, Serialize, Deserialize, Default)]
+#[tsify(into_wasm_abi)]
+#[allow(non_camel_case_types)]
+pub struct UserDiff {
+    pub new_state_merkle_root: String, // TODO add a merkle proof that the new_value belongs to that state
+    pub value_commitment: String,
+    pub field: String,
+    pub previous_value: Value,
+    pub new_value: Value,
+    pub notify_user: bool,
+    pub need_validation: bool,
+    pub validation_status: DiffStatus,
+}
+
 #[derive(Debug, PartialEq, Tsify, Serialize, Deserialize, Default)]
 #[tsify(into_wasm_abi)]
 #[allow(non_camel_case_types)]