diff --git a/native/cpp/CommonCpp/NativeModules/CommRustModule.h b/native/cpp/CommonCpp/NativeModules/CommRustModule.h
--- a/native/cpp/CommonCpp/NativeModules/CommRustModule.h
+++ b/native/cpp/CommonCpp/NativeModules/CommRustModule.h
@@ -23,7 +23,8 @@
       jsi::String notifPrekey,
       jsi::String notifPrekeySignature,
       jsi::Array contentOneTimeKeys,
-      jsi::Array notifOneTimeKeys) override;
+      jsi::Array notifOneTimeKeys,
+      jsi::String farcasterID) override;
   virtual jsi::Value logInPasswordUser(
       jsi::Runtime &rt,
       jsi::String username,
@@ -45,7 +46,8 @@
       jsi::String notifPrekey,
       jsi::String notifPrekeySignature,
       jsi::Array contentOneTimeKeys,
-      jsi::Array notifOneTimeKeys) override;
+      jsi::Array notifOneTimeKeys,
+      jsi::String farcasterID) override;
   virtual jsi::Value logInWalletUser(
       jsi::Runtime &rt,
       jsi::String siweMessage,
diff --git a/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp b/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
--- a/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
+++ b/native/cpp/CommonCpp/NativeModules/CommRustModule.cpp
@@ -42,7 +42,8 @@
     jsi::String notifPrekey,
     jsi::String notifPrekeySignature,
     jsi::Array contentOneTimeKeys,
-    jsi::Array notifOneTimeKeys) {
+    jsi::Array notifOneTimeKeys,
+    jsi::String farcasterID) {
   auto usernameRust = jsiStringToRustString(username, rt);
   auto passwordRust = jsiStringToRustString(password, rt);
   auto keyPayloadRust = jsiStringToRustString(keyPayload, rt);
@@ -55,6 +56,7 @@
       jsiStringToRustString(notifPrekeySignature, rt);
   auto contentOneTimeKeysRust = jsiStringArrayToRustVec(contentOneTimeKeys, rt);
   auto notifOneTimeKeysRust = jsiStringArrayToRustVec(notifOneTimeKeys, rt);
+  auto farcasterIDRust = jsiStringToRustString(farcasterID, rt);
 
   return createPromiseAsJSIValue(
       rt, [=, this](jsi::Runtime &innerRt, std::shared_ptr<Promise> promise) {
@@ -73,6 +75,7 @@
               notifPrekeySignatureRust,
               contentOneTimeKeysRust,
               notifOneTimeKeysRust,
+              farcasterIDRust,
               currentID);
         } catch (const std::exception &e) {
           error = e.what();
@@ -142,7 +145,8 @@
     jsi::String notifPrekey,
     jsi::String notifPrekeySignature,
     jsi::Array contentOneTimeKeys,
-    jsi::Array notifOneTimeKeys) {
+    jsi::Array notifOneTimeKeys,
+    jsi::String farcasterID) {
   auto siweMessageRust = jsiStringToRustString(siweMessage, rt);
   auto siweSignatureRust = jsiStringToRustString(siweSignature, rt);
   auto keyPayloadRust = jsiStringToRustString(keyPayload, rt);
@@ -155,6 +159,7 @@
       jsiStringToRustString(notifPrekeySignature, rt);
   auto contentOneTimeKeysRust = jsiStringArrayToRustVec(contentOneTimeKeys, rt);
   auto notifOneTimeKeysRust = jsiStringArrayToRustVec(notifOneTimeKeys, rt);
+  auto farcasterIDRust = jsiStringToRustString(farcasterID, rt);
 
   return createPromiseAsJSIValue(
       rt, [=, this](jsi::Runtime &innerRt, std::shared_ptr<Promise> promise) {
@@ -173,6 +178,7 @@
               notifPrekeySignatureRust,
               contentOneTimeKeysRust,
               notifOneTimeKeysRust,
+              farcasterIDRust,
               currentID);
         } catch (const std::exception &e) {
           error = e.what();
diff --git a/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp b/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
--- a/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
+++ b/native/cpp/CommonCpp/_generated/rustJSI-generated.cpp
@@ -16,13 +16,13 @@
   return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->generateNonce(rt);
 }
 static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerPasswordUser(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
-  return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->registerPasswordUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt), args[8].asObject(rt).asArray(rt), args[9].asObject(rt).asArray(rt));
+  return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->registerPasswordUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt), args[8].asObject(rt).asArray(rt), args[9].asObject(rt).asArray(rt), args[10].asString(rt));
 }
 static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_logInPasswordUser(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
   return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->logInPasswordUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt));
 }
 static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerWalletUser(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
-  return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->registerWalletUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt), args[8].asObject(rt).asArray(rt), args[9].asObject(rt).asArray(rt));
+  return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->registerWalletUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt), args[8].asObject(rt).asArray(rt), args[9].asObject(rt).asArray(rt), args[10].asString(rt));
 }
 static jsi::Value __hostFunction_CommRustModuleSchemaCxxSpecJSI_logInWalletUser(jsi::Runtime &rt, TurboModule &turboModule, const jsi::Value* args, size_t count) {
   return static_cast<CommRustModuleSchemaCxxSpecJSI *>(&turboModule)->logInWalletUser(rt, args[0].asString(rt), args[1].asString(rt), args[2].asString(rt), args[3].asString(rt), args[4].asString(rt), args[5].asString(rt), args[6].asString(rt), args[7].asString(rt));
@@ -70,9 +70,9 @@
 CommRustModuleSchemaCxxSpecJSI::CommRustModuleSchemaCxxSpecJSI(std::shared_ptr<CallInvoker> jsInvoker)
   : TurboModule("CommRustTurboModule", jsInvoker) {
   methodMap_["generateNonce"] = MethodMetadata {0, __hostFunction_CommRustModuleSchemaCxxSpecJSI_generateNonce};
-  methodMap_["registerPasswordUser"] = MethodMetadata {10, __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerPasswordUser};
+  methodMap_["registerPasswordUser"] = MethodMetadata {11, __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerPasswordUser};
   methodMap_["logInPasswordUser"] = MethodMetadata {8, __hostFunction_CommRustModuleSchemaCxxSpecJSI_logInPasswordUser};
-  methodMap_["registerWalletUser"] = MethodMetadata {10, __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerWalletUser};
+  methodMap_["registerWalletUser"] = MethodMetadata {11, __hostFunction_CommRustModuleSchemaCxxSpecJSI_registerWalletUser};
   methodMap_["logInWalletUser"] = MethodMetadata {8, __hostFunction_CommRustModuleSchemaCxxSpecJSI_logInWalletUser};
   methodMap_["updatePassword"] = MethodMetadata {4, __hostFunction_CommRustModuleSchemaCxxSpecJSI_updatePassword};
   methodMap_["deleteUser"] = MethodMetadata {3, __hostFunction_CommRustModuleSchemaCxxSpecJSI_deleteUser};
diff --git a/native/cpp/CommonCpp/_generated/rustJSI.h b/native/cpp/CommonCpp/_generated/rustJSI.h
--- a/native/cpp/CommonCpp/_generated/rustJSI.h
+++ b/native/cpp/CommonCpp/_generated/rustJSI.h
@@ -21,9 +21,9 @@
 
 public:
   virtual jsi::Value generateNonce(jsi::Runtime &rt) = 0;
-  virtual jsi::Value registerPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) = 0;
+  virtual jsi::Value registerPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys, jsi::String farcasterID) = 0;
   virtual jsi::Value logInPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature) = 0;
-  virtual jsi::Value registerWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) = 0;
+  virtual jsi::Value registerWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys, jsi::String farcasterID) = 0;
   virtual jsi::Value logInWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature) = 0;
   virtual jsi::Value updatePassword(jsi::Runtime &rt, jsi::String userID, jsi::String deviceID, jsi::String accessToken, jsi::String password) = 0;
   virtual jsi::Value deleteUser(jsi::Runtime &rt, jsi::String userID, jsi::String deviceID, jsi::String accessToken) = 0;
@@ -67,13 +67,13 @@
       return bridging::callFromJs<jsi::Value>(
           rt, &T::generateNonce, jsInvoker_, instance_);
     }
-    jsi::Value registerPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) override {
+    jsi::Value registerPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys, jsi::String farcasterID) override {
       static_assert(
-          bridging::getParameterCount(&T::registerPasswordUser) == 11,
-          "Expected registerPasswordUser(...) to have 11 parameters");
+          bridging::getParameterCount(&T::registerPasswordUser) == 12,
+          "Expected registerPasswordUser(...) to have 12 parameters");
 
       return bridging::callFromJs<jsi::Value>(
-          rt, &T::registerPasswordUser, jsInvoker_, instance_, std::move(username), std::move(password), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature), std::move(contentOneTimeKeys), std::move(notifOneTimeKeys));
+          rt, &T::registerPasswordUser, jsInvoker_, instance_, std::move(username), std::move(password), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature), std::move(contentOneTimeKeys), std::move(notifOneTimeKeys), std::move(farcasterID));
     }
     jsi::Value logInPasswordUser(jsi::Runtime &rt, jsi::String username, jsi::String password, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature) override {
       static_assert(
@@ -83,13 +83,13 @@
       return bridging::callFromJs<jsi::Value>(
           rt, &T::logInPasswordUser, jsInvoker_, instance_, std::move(username), std::move(password), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature));
     }
-    jsi::Value registerWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys) override {
+    jsi::Value registerWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature, jsi::Array contentOneTimeKeys, jsi::Array notifOneTimeKeys, jsi::String farcasterID) override {
       static_assert(
-          bridging::getParameterCount(&T::registerWalletUser) == 11,
-          "Expected registerWalletUser(...) to have 11 parameters");
+          bridging::getParameterCount(&T::registerWalletUser) == 12,
+          "Expected registerWalletUser(...) to have 12 parameters");
 
       return bridging::callFromJs<jsi::Value>(
-          rt, &T::registerWalletUser, jsInvoker_, instance_, std::move(siweMessage), std::move(siweSignature), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature), std::move(contentOneTimeKeys), std::move(notifOneTimeKeys));
+          rt, &T::registerWalletUser, jsInvoker_, instance_, std::move(siweMessage), std::move(siweSignature), std::move(keyPayload), std::move(keyPayloadSignature), std::move(contentPrekey), std::move(contentPrekeySignature), std::move(notifPrekey), std::move(notifPrekeySignature), std::move(contentOneTimeKeys), std::move(notifOneTimeKeys), std::move(farcasterID));
     }
     jsi::Value logInWalletUser(jsi::Runtime &rt, jsi::String siweMessage, jsi::String siweSignature, jsi::String keyPayload, jsi::String keyPayloadSignature, jsi::String contentPrekey, jsi::String contentPrekeySignature, jsi::String notifPrekey, jsi::String notifPrekeySignature) override {
       static_assert(
diff --git a/native/identity-service/identity-service-context-provider.react.js b/native/identity-service/identity-service-context-provider.react.js
--- a/native/identity-service/identity-service-context-provider.react.js
+++ b/native/identity-service/identity-service-context-provider.react.js
@@ -317,6 +317,7 @@
           prekeys.notifPrekeySignature,
           getOneTimeKeyValues(contentOneTimeKeys),
           getOneTimeKeyValues(notificationsOneTimeKeys),
+          '',
         );
         const { userID, accessToken: token } = JSON.parse(registrationResult);
         const identityAuthResult = { accessToken: token, userID, username };
@@ -393,6 +394,7 @@
           prekeys.notifPrekeySignature,
           getOneTimeKeyValues(contentOneTimeKeys),
           getOneTimeKeyValues(notificationsOneTimeKeys),
+          '',
         );
         const { userID, accessToken: token } = JSON.parse(registrationResult);
         const identityAuthResult = {
diff --git a/native/native_rust_library/src/farcaster.rs b/native/native_rust_library/src/farcaster.rs
new file mode 100644
--- /dev/null
+++ b/native/native_rust_library/src/farcaster.rs
@@ -0,0 +1,7 @@
+pub fn farcaster_id_string_to_option(input: &str) -> Option<String> {
+  if input.is_empty() {
+    None
+  } else {
+    Some(input.to_string())
+  }
+}
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
@@ -4,6 +4,7 @@
 use exact_user_search::{
   find_user_id_for_username, find_user_id_for_wallet_address,
 };
+use farcaster::farcaster_id_string_to_option;
 use ffi::{bool_callback, string_callback, void_callback};
 use future_manager::ffi::*;
 use grpc_clients::identity::protos::auth::{
@@ -34,6 +35,7 @@
 mod backup;
 mod constants;
 mod exact_user_search;
+mod farcaster;
 mod future_manager;
 mod wallet_registration;
 
@@ -75,6 +77,7 @@
       notif_prekey_signature: String,
       content_one_time_keys: Vec<String>,
       notif_one_time_keys: Vec<String>,
+      farcaster_id: String,
       promise_id: u32,
     );
 
@@ -103,6 +106,7 @@
       notif_prekey_signature: String,
       content_one_time_keys: Vec<String>,
       notif_one_time_keys: Vec<String>,
+      farcaster_id: String,
       promise_id: u32,
     );
 
@@ -544,6 +548,7 @@
   notif_prekey_signature: String,
   content_one_time_keys: Vec<String>,
   notif_one_time_keys: Vec<String>,
+  farcaster_id: String,
   promise_id: u32,
 ) {
   RUNTIME.spawn(async move {
@@ -558,6 +563,7 @@
       notif_prekey_signature,
       content_one_time_keys,
       notif_one_time_keys,
+      farcaster_id: farcaster_id_string_to_option(&farcaster_id),
     };
     let result = register_password_user_helper(password_user_info).await;
     handle_string_result_as_callback(result, promise_id);
@@ -575,6 +581,7 @@
   notif_prekey_signature: String,
   content_one_time_keys: Vec<String>,
   notif_one_time_keys: Vec<String>,
+  farcaster_id: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -626,7 +633,7 @@
       one_time_notif_prekeys: password_user_info.notif_one_time_keys,
       device_type: DEVICE_TYPE.into(),
     }),
-    farcaster_id: None,
+    farcaster_id: password_user_info.farcaster_id,
   };
 
   let mut identity_client = get_unauthenticated_client(
@@ -686,6 +693,7 @@
       notif_prekey_signature,
       content_one_time_keys: Vec::new(),
       notif_one_time_keys: Vec::new(),
+      farcaster_id: None,
     };
     let result = log_in_password_user_helper(password_user_info).await;
     handle_string_result_as_callback(result, promise_id);
@@ -765,6 +773,7 @@
   notif_prekey_signature: String,
   content_one_time_keys: Vec<String>,
   notif_one_time_keys: Vec<String>,
+  farcaster_id: Option<String>,
 }
 
 #[instrument]
@@ -791,6 +800,7 @@
       notif_prekey_signature,
       content_one_time_keys: Vec::new(),
       notif_one_time_keys: Vec::new(),
+      farcaster_id: None,
     };
     let result = log_in_wallet_user_helper(wallet_user_info).await;
     handle_string_result_as_callback(result, promise_id);
diff --git a/native/native_rust_library/src/wallet_registration.rs b/native/native_rust_library/src/wallet_registration.rs
--- a/native/native_rust_library/src/wallet_registration.rs
+++ b/native/native_rust_library/src/wallet_registration.rs
@@ -1,6 +1,7 @@
 use crate::{
-  handle_string_result_as_callback, Error, UserIDAndDeviceAccessToken,
-  WalletUserInfo, CODE_VERSION, DEVICE_TYPE, IDENTITY_SOCKET_ADDR, RUNTIME,
+  farcaster::farcaster_id_string_to_option, handle_string_result_as_callback,
+  Error, UserIDAndDeviceAccessToken, WalletUserInfo, CODE_VERSION, DEVICE_TYPE,
+  IDENTITY_SOCKET_ADDR, RUNTIME,
 };
 use grpc_clients::identity::{
   get_unauthenticated_client,
@@ -22,6 +23,7 @@
   notif_prekey_signature: String,
   content_one_time_keys: Vec<String>,
   notif_one_time_keys: Vec<String>,
+  farcaster_id: String,
   promise_id: u32,
 ) {
   RUNTIME.spawn(async move {
@@ -36,6 +38,7 @@
       notif_prekey_signature,
       content_one_time_keys,
       notif_one_time_keys,
+      farcaster_id: farcaster_id_string_to_option(&farcaster_id),
     };
     let result = register_wallet_user_helper(wallet_user_info).await;
     handle_string_result_as_callback(result, promise_id);
@@ -66,7 +69,7 @@
       one_time_notif_prekeys: wallet_user_info.notif_one_time_keys,
       device_type: DEVICE_TYPE.into(),
     }),
-    farcaster_id: None,
+    farcaster_id: wallet_user_info.farcaster_id,
   };
 
   let mut identity_client = get_unauthenticated_client(
diff --git a/native/schema/CommRustModuleSchema.js b/native/schema/CommRustModuleSchema.js
--- a/native/schema/CommRustModuleSchema.js
+++ b/native/schema/CommRustModuleSchema.js
@@ -18,6 +18,7 @@
     notifPrekeySignature: string,
     contentOneTimeKeys: $ReadOnlyArray<string>,
     notifOneTimeKeys: $ReadOnlyArray<string>,
+    farcasterID: string,
   ) => Promise<string>;
   +logInPasswordUser: (
     username: string,
@@ -40,6 +41,7 @@
     notifPrekeySignature: string,
     contentOneTimeKeys: $ReadOnlyArray<string>,
     notifOneTimeKeys: $ReadOnlyArray<string>,
+    farcasterID: string,
   ) => Promise<string>;
   +logInWalletUser: (
     siweMessage: string,