diff --git a/native/native_rust_library/src/identity_client.rs b/native/native_rust_library/src/identity_client.rs
--- a/native/native_rust_library/src/identity_client.rs
+++ b/native/native_rust_library/src/identity_client.rs
@@ -204,7 +204,7 @@
   user_id: String,
   signing_public_key: String,
   siwe_message: String,
-  siwe_signature: Vec<u8>,
+  siwe_signature: String,
 ) -> Result<String, Status> {
   // Create a LoginRequest channel and use ReceiverStream to turn the
   // MPSC receiver into a Stream for outbound messages
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
@@ -82,7 +82,7 @@
       user_id: String,
       signing_public_key: String,
       siwe_message: String,
-      siwe_signature: Vec<u8>,
+      siwe_signature: String,
     ) -> Result<String>;
 
     // Tunnelbroker Service Client
@@ -171,7 +171,7 @@
   user_id: String,
   signing_public_key: String,
   siwe_message: String,
-  siwe_signature: Vec<u8>,
+  siwe_signature: String,
 ) -> Result<String, Status> {
   RUNTIME.block_on(identity_client::login_user_wallet(
     client,
diff --git a/services/identity/src/service.rs b/services/identity/src/service.rs
--- a/services/identity/src/service.rs
+++ b/services/identity/src/service.rs
@@ -335,7 +335,7 @@
   user_id: &str,
   signing_public_key: &str,
   siwe_message: &str,
-  siwe_signature: Vec<u8>,
+  siwe_signature: &str,
 ) -> Result<(), Status> {
   if user_id.is_empty() || signing_public_key.is_empty() {
     error!(
@@ -352,7 +352,7 @@
     }
   };
   match siwe_message.verify(
-    match siwe_signature.try_into() {
+    match siwe_signature.as_bytes().try_into() {
       Ok(s) => s,
       Err(e) => {
         error!("Conversion to SIWE signature failed: {:?}", e);
@@ -383,7 +383,7 @@
     &wallet_login_request.user_id,
     &wallet_login_request.signing_public_key,
     &wallet_login_request.siwe_message,
-    wallet_login_request.siwe_signature,
+    &wallet_login_request.siwe_signature,
   )?;
   client
     .update_users_table(
diff --git a/shared/protos/identity.proto b/shared/protos/identity.proto
--- a/shared/protos/identity.proto
+++ b/shared/protos/identity.proto
@@ -84,7 +84,7 @@
   // ed25519 key for the given user's device
   string signingPublicKey = 2;
   string siweMessage = 3;
-  bytes siweSignature = 4;
+  string siweSignature = 4;
   // Information specific to a user's device needed to open a new channel of
   // communication with this user
   SessionInitializationInfo sessionInitializationInfo = 5;