diff --git a/services/identity/src/client_service.rs b/services/identity/src/client_service.rs
--- a/services/identity/src/client_service.rs
+++ b/services/identity/src/client_service.rs
@@ -36,11 +36,11 @@
 use crate::id::generate_uuid;
 use crate::nonce::generate_nonce_data;
 use crate::reserved_users::{
-  is_valid_ethereum_address, validate_add_reserved_usernames_message,
+  validate_add_reserved_usernames_message,
   validate_remove_reserved_username_message,
   validate_signed_account_ownership_message,
 };
-use crate::siwe::parse_and_verify_siwe_message;
+use crate::siwe::{is_valid_ethereum_address, parse_and_verify_siwe_message};
 use crate::token::{AccessTokenData, AuthType};
 pub use client_proto::identity_client_service_server::{
   IdentityClientService, IdentityClientServiceServer,
diff --git a/services/identity/src/reserved_users.rs b/services/identity/src/reserved_users.rs
--- a/services/identity/src/reserved_users.rs
+++ b/services/identity/src/reserved_users.rs
@@ -2,7 +2,6 @@
 use chrono::{DateTime, Utc};
 use constant_time_eq::constant_time_eq;
 use ed25519_dalek::{PublicKey, Signature, Verifier};
-use regex::Regex;
 use serde::Deserialize;
 use tonic::Status;
 
@@ -113,52 +112,3 @@
 
   Ok(deserialized_message.payload)
 }
-
-pub fn is_valid_ethereum_address(candidate: &str) -> bool {
-  let ethereum_address_regex = Regex::new(r"^0x[a-fA-F0-9]{40}$").unwrap();
-  ethereum_address_regex.is_match(candidate)
-}
-
-#[cfg(test)]
-mod tests {
-  use super::*;
-
-  #[test]
-  fn test_valid_ethereum_address() {
-    assert!(is_valid_ethereum_address(
-      "0x1234567890123456789012345678901234567890"
-    ),);
-    assert!(is_valid_ethereum_address(
-      "0xABCDEF123456789012345678901234567890ABCD"
-    ));
-    assert!(is_valid_ethereum_address(
-      "0xabcdef123456789012345678901234567890abcd"
-    ));
-  }
-
-  #[test]
-  fn test_invalid_ethereum_address() {
-    // Shorter than 42 characters
-    assert_eq!(
-      is_valid_ethereum_address("0x12345678901234567890123456789012345678"),
-      false
-    );
-    // Longer than 42 characters
-    assert_eq!(
-      is_valid_ethereum_address("0x123456789012345678901234567890123456789012"),
-      false
-    );
-    // Missing 0x prefix
-    assert_eq!(
-      is_valid_ethereum_address("1234567890123456789012345678901234567890"),
-      false
-    );
-    // Contains invalid characters
-    assert_eq!(
-      is_valid_ethereum_address("0x1234567890GHIJKL9012345678901234567890"),
-      false
-    );
-    // Empty string
-    assert_eq!(is_valid_ethereum_address(""), false);
-  }
-}
diff --git a/services/identity/src/siwe.rs b/services/identity/src/siwe.rs
--- a/services/identity/src/siwe.rs
+++ b/services/identity/src/siwe.rs
@@ -1,4 +1,5 @@
 use chrono::Utc;
+use regex::Regex;
 use siwe::Message;
 use tonic::Status;
 use tracing::error;
@@ -32,3 +33,52 @@
 
   Ok(siwe_message)
 }
+
+pub fn is_valid_ethereum_address(candidate: &str) -> bool {
+  let ethereum_address_regex = Regex::new(r"^0x[a-fA-F0-9]{40}$").unwrap();
+  ethereum_address_regex.is_match(candidate)
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn test_valid_ethereum_address() {
+    assert!(is_valid_ethereum_address(
+      "0x1234567890123456789012345678901234567890"
+    ),);
+    assert!(is_valid_ethereum_address(
+      "0xABCDEF123456789012345678901234567890ABCD"
+    ));
+    assert!(is_valid_ethereum_address(
+      "0xabcdef123456789012345678901234567890abcd"
+    ));
+  }
+
+  #[test]
+  fn test_invalid_ethereum_address() {
+    // Shorter than 42 characters
+    assert_eq!(
+      is_valid_ethereum_address("0x12345678901234567890123456789012345678"),
+      false
+    );
+    // Longer than 42 characters
+    assert_eq!(
+      is_valid_ethereum_address("0x123456789012345678901234567890123456789012"),
+      false
+    );
+    // Missing 0x prefix
+    assert_eq!(
+      is_valid_ethereum_address("1234567890123456789012345678901234567890"),
+      false
+    );
+    // Contains invalid characters
+    assert_eq!(
+      is_valid_ethereum_address("0x1234567890GHIJKL9012345678901234567890"),
+      false
+    );
+    // Empty string
+    assert_eq!(is_valid_ethereum_address(""), false);
+  }
+}