diff --git a/native/native_rust_library/src/lib.rs b/native/native_rust_library/src/lib.rs
--- a/native/native_rust_library/src/lib.rs
+++ b/native/native_rust_library/src/lib.rs
@@ -23,10 +23,12 @@
 use tokio::runtime::{Builder, Runtime};
 use tonic::{Request, Status};
 use tracing::instrument;
+use wallet_registration::register_wallet_user;
 
 mod argon2_tools;
 mod backup;
 mod constants;
+mod wallet_registration;
 
 use argon2_tools::compute_backup_key_str;
 
@@ -84,6 +86,21 @@
       promise_id: u32,
     );
 
+    #[cxx_name = "identityRegisterWalletUser"]
+    fn register_wallet_user(
+      siwe_message: String,
+      siwe_signature: String,
+      key_payload: String,
+      key_payload_signature: String,
+      content_prekey: String,
+      content_prekey_signature: String,
+      notif_prekey: String,
+      notif_prekey_signature: String,
+      content_one_time_keys: Vec<String>,
+      notif_one_time_keys: Vec<String>,
+      promise_id: u32,
+    );
+
     #[cxx_name = "identityLogInWalletUser"]
     fn log_in_wallet_user(
       siwe_message: String,
diff --git a/native/native_rust_library/src/wallet_registration.rs b/native/native_rust_library/src/wallet_registration.rs
new file mode 100644
--- /dev/null
+++ b/native/native_rust_library/src/wallet_registration.rs
@@ -0,0 +1,88 @@
+use crate::{
+  handle_string_result_as_callback, Error, UserIDAndDeviceAccessToken,
+  WalletUserInfo, CODE_VERSION, DEVICE_TYPE, IDENTITY_SOCKET_ADDR, RUNTIME,
+};
+use grpc_clients::identity::{
+  get_unauthenticated_client,
+  protos::unauth::{
+    DeviceKeyUpload, IdentityKeyInfo, Prekey, WalletAuthRequest,
+  },
+};
+use tracing::instrument;
+
+#[instrument]
+pub fn register_wallet_user(
+  siwe_message: String,
+  siwe_signature: String,
+  key_payload: String,
+  key_payload_signature: String,
+  content_prekey: String,
+  content_prekey_signature: String,
+  notif_prekey: String,
+  notif_prekey_signature: String,
+  content_one_time_keys: Vec<String>,
+  notif_one_time_keys: Vec<String>,
+  promise_id: u32,
+) {
+  RUNTIME.spawn(async move {
+    let wallet_user_info = WalletUserInfo {
+      siwe_message,
+      siwe_signature,
+      key_payload,
+      key_payload_signature,
+      content_prekey,
+      content_prekey_signature,
+      notif_prekey,
+      notif_prekey_signature,
+      content_one_time_keys,
+      notif_one_time_keys,
+    };
+    let result = register_wallet_user_helper(wallet_user_info).await;
+    handle_string_result_as_callback(result, promise_id);
+  });
+}
+
+async fn register_wallet_user_helper(
+  wallet_user_info: WalletUserInfo,
+) -> Result<String, Error> {
+  let registration_request = WalletAuthRequest {
+    siwe_message: wallet_user_info.siwe_message,
+    siwe_signature: wallet_user_info.siwe_signature,
+    device_key_upload: Some(DeviceKeyUpload {
+      device_key_info: Some(IdentityKeyInfo {
+        payload: wallet_user_info.key_payload,
+        payload_signature: wallet_user_info.key_payload_signature,
+        social_proof: None, // The SIWE message and signature are the social proof
+      }),
+      content_upload: Some(Prekey {
+        prekey: wallet_user_info.content_prekey,
+        prekey_signature: wallet_user_info.content_prekey_signature,
+      }),
+      notif_upload: Some(Prekey {
+        prekey: wallet_user_info.notif_prekey,
+        prekey_signature: wallet_user_info.notif_prekey_signature,
+      }),
+      one_time_content_prekeys: wallet_user_info.content_one_time_keys,
+      one_time_notif_prekeys: wallet_user_info.notif_one_time_keys,
+      device_type: DEVICE_TYPE.into(),
+    }),
+  };
+
+  let mut identity_client = get_unauthenticated_client(
+    IDENTITY_SOCKET_ADDR,
+    CODE_VERSION,
+    DEVICE_TYPE.as_str_name().to_lowercase(),
+  )
+  .await?;
+
+  let registration_response = identity_client
+    .register_wallet_user(registration_request)
+    .await?
+    .into_inner();
+
+  let user_id_and_access_token = UserIDAndDeviceAccessToken {
+    user_id: registration_response.user_id,
+    access_token: registration_response.access_token,
+  };
+  Ok(serde_json::to_string(&user_id_and_access_token)?)
+}