diff --git a/services/identity/Cargo.lock b/services/identity/Cargo.lock
index 2f778b5c2..8865b1c63 100644
--- a/services/identity/Cargo.lock
+++ b/services/identity/Cargo.lock
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 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4542c6e364ce21bf45d69fdd2a8e455fa38d316158cfd43b3ac1c5b1b19f8e00"
 
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ca2b8a661f7628cbd23440e50b05d705db3686f894fc9580820623656af974b1"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
 
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
 
 [[package]]
 name = "xmlparser"
 version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d25c75bf9ea12c4040a97f829154768bbbce366287e2dc044af160cd79a13fd"
 
 [[package]]
 name = "zeroize"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
 dependencies = [
  "zeroize_derive",
 ]
 
 [[package]]
 name = "zeroize_derive"
 version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn 2.0.28",
 ]
diff --git a/services/identity/Cargo.toml b/services/identity/Cargo.toml
index f6a927735..2c5a95de8 100644
--- a/services/identity/Cargo.toml
+++ b/services/identity/Cargo.toml
@@ -1,35 +1,36 @@
 [package]
 name = "identity"
 version = "0.1.0"
 edition = "2021"
 license = "BSD-3-Clause"
 
 [dependencies]
 tonic = "0.9.1"
 prost = "0.11"
 tokio = { version = "1.24", features = ["macros", "rt-multi-thread"] }
 ed25519-dalek = "1"
 clap = { version = "3.1.12", features = ["derive"] }
 derive_more = "0.99"
 aws-config = "0.54.0"
 aws-sdk-dynamodb = "0.24.0"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 chrono = "0.4.19"
 rand = "0.8"
 constant_time_eq = "0.2.2"
 siwe = "0.3"
 comm-opaque2 = { path = "../../shared/comm-opaque2" }
 grpc_clients = { path = "../../shared/grpc_clients" }
 once_cell = "1.17"
 hex = "0.4"
 tonic-web = "0.9.1"
 serde = { version = "1.0.159", features = [ "derive" ] }
 serde_json = "1.0.95"
 tunnelbroker_messages = { path = "../../shared/tunnelbroker_messages" }
 moka = { version = "0.10", features = ["future"] }
 uuid = { version = "1.3", features = [ "v4" ] }
 base64 = "0.21.2"
+regex = "1"
 
 [build-dependencies]
 tonic-build = "0.9.1"
diff --git a/services/identity/src/client_service.rs b/services/identity/src/client_service.rs
index 62c1f8756..3d97a0d91 100644
--- a/services/identity/src/client_service.rs
+++ b/services/identity/src/client_service.rs
@@ -1,1018 +1,1020 @@
 use std::collections::HashMap;
 // Standard library imports
 use std::str::FromStr;
 
 // External crate imports
 use aws_sdk_dynamodb::Error as DynamoDBError;
 use comm_opaque2::grpc::protocol_error_to_grpc_status;
 use moka::future::Cache;
 use rand::rngs::OsRng;
 use tonic::Response;
 use tracing::{debug, error};
 
 // Workspace crate imports
 use crate::client_service::client_proto::{
   inbound_keys_for_user_request, outbound_keys_for_user_request,
   AddReservedUsernamesRequest, DeleteUserRequest, Empty, GenerateNonceResponse,
   InboundKeyInfo, InboundKeysForUserRequest, InboundKeysForUserResponse,
   LogoutRequest, OpaqueLoginFinishRequest, OpaqueLoginFinishResponse,
   OpaqueLoginStartRequest, OpaqueLoginStartResponse, OutboundKeyInfo,
   OutboundKeysForUserRequest, OutboundKeysForUserResponse,
   RefreshUserPreKeysRequest, RegistrationFinishRequest,
   RegistrationFinishResponse, RegistrationStartRequest,
   RegistrationStartResponse, RemoveReservedUsernameRequest,
   ReservedRegistrationStartRequest, UpdateUserPasswordFinishRequest,
   UpdateUserPasswordStartRequest, UpdateUserPasswordStartResponse,
   UploadOneTimeKeysRequest, VerifyUserAccessTokenRequest,
   VerifyUserAccessTokenResponse, WalletLoginRequest, WalletLoginResponse,
 };
 use crate::config::CONFIG;
 use crate::database::{DatabaseClient, Device, KeyPayload};
 use crate::error::Error as DBError;
 use crate::grpc_utils::DeviceInfoWithAuth;
 use crate::id::generate_uuid;
 use crate::nonce::generate_nonce_data;
 use crate::reserved_users::{
-  validate_add_reserved_usernames_message,
+  is_valid_ethereum_address, 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::token::{AccessTokenData, AuthType};
 pub use client_proto::identity_client_service_server::{
   IdentityClientService, IdentityClientServiceServer,
 };
 
 pub mod client_proto {
   tonic::include_proto!("identity.client");
 }
 
 #[derive(Clone)]
 pub enum WorkflowInProgress {
   Registration(Box<UserRegistrationInfo>),
   Login(Box<UserLoginInfo>),
   Update(UpdateState),
 }
 
 #[derive(Clone)]
 pub struct UserRegistrationInfo {
   pub username: String,
   pub flattened_device_key_upload: FlattenedDeviceKeyUpload,
 }
 
 #[derive(Clone)]
 pub struct UserLoginInfo {
   pub user_id: String,
   pub flattened_device_key_upload: FlattenedDeviceKeyUpload,
   pub opaque_server_login: comm_opaque2::server::Login,
 }
 
 #[derive(Clone)]
 pub struct UpdateState {
   pub user_id: String,
 }
 
 #[derive(Clone)]
 pub struct FlattenedDeviceKeyUpload {
   pub device_id_key: String,
   pub key_payload: String,
   pub key_payload_signature: String,
   pub content_prekey: String,
   pub content_prekey_signature: String,
   pub content_one_time_keys: Vec<String>,
   pub notif_prekey: String,
   pub notif_prekey_signature: String,
   pub notif_one_time_keys: Vec<String>,
   pub device_type: Device,
 }
 
 #[derive(derive_more::Constructor)]
 pub struct ClientService {
   client: DatabaseClient,
   cache: Cache<String, WorkflowInProgress>,
 }
 
 #[tonic::async_trait]
 impl IdentityClientService for ClientService {
   async fn register_password_user_start(
     &self,
     request: tonic::Request<RegistrationStartRequest>,
   ) -> Result<tonic::Response<RegistrationStartResponse>, tonic::Status> {
     let message = request.into_inner();
     debug!("Received registration request for: {}", message.username);
 
     let username_taken = self
       .client
       .username_taken(message.username.clone())
       .await
       .map_err(handle_db_error)?;
     let username_in_reserved_usernames_table = self
       .client
       .username_in_reserved_usernames_table(&message.username)
       .await
       .map_err(handle_db_error)?;
 
     if username_taken || username_in_reserved_usernames_table {
       return Err(tonic::Status::already_exists("username already exists"));
     }
 
-    if CONFIG.reserved_usernames.contains(&message.username) {
+    if CONFIG.reserved_usernames.contains(&message.username)
+      || is_valid_ethereum_address(&message.username)
+    {
       return Err(tonic::Status::invalid_argument("username reserved"));
     }
 
     if let client_proto::RegistrationStartRequest {
       opaque_registration_request: register_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
     } = message
     {
       let server_registration = comm_opaque2::server::Registration::new();
       let server_message = server_registration
         .start(&CONFIG.server_setup, &register_message, username.as_bytes())
         .map_err(protocol_error_to_grpc_status)?;
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let registration_state = UserRegistrationInfo {
         username,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Registration(Box::new(registration_state)),
         )
         .await;
 
       let response = RegistrationStartResponse {
         session_id,
         opaque_registration_response: server_message,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn register_reserved_password_user_start(
     &self,
     request: tonic::Request<ReservedRegistrationStartRequest>,
   ) -> Result<tonic::Response<RegistrationStartResponse>, tonic::Status> {
     let message = request.into_inner();
     let username_taken = self
       .client
       .username_taken(message.username.clone())
       .await
       .map_err(handle_db_error)?;
 
     if username_taken {
       return Err(tonic::Status::already_exists("username already exists"));
     }
 
     if CONFIG.reserved_usernames.contains(&message.username) {
       return Err(tonic::Status::invalid_argument("username reserved"));
     }
 
     let username_in_reserved_usernames_table = self
       .client
       .username_in_reserved_usernames_table(&message.username)
       .await
       .map_err(handle_db_error)?;
     if username_in_reserved_usernames_table {
       validate_signed_account_ownership_message(
         &message.username,
         &message.keyserver_message,
         &message.keyserver_signature,
       )?;
     } else {
       return Err(tonic::Status::permission_denied("username not reserved"));
     }
 
     if let client_proto::ReservedRegistrationStartRequest {
       opaque_registration_request: register_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
       ..
     } = message
     {
       let server_registration = comm_opaque2::server::Registration::new();
       let server_message = server_registration
         .start(&CONFIG.server_setup, &register_message, username.as_bytes())
         .map_err(protocol_error_to_grpc_status)?;
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let registration_state = UserRegistrationInfo {
         username,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
 
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Registration(Box::new(registration_state)),
         )
         .await;
 
       let response = RegistrationStartResponse {
         session_id,
         opaque_registration_response: server_message,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn register_password_user_finish(
     &self,
     request: tonic::Request<RegistrationFinishRequest>,
   ) -> Result<tonic::Response<RegistrationFinishResponse>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Registration(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       let server_registration = comm_opaque2::server::Registration::new();
       let password_file = server_registration
         .finish(&message.opaque_registration_upload)
         .map_err(protocol_error_to_grpc_status)?;
 
       let device_id = state.flattened_device_key_upload.device_id_key.clone();
       let user_id = self
         .client
         .add_password_user_to_users_table(*state, password_file)
         .await
         .map_err(handle_db_error)?;
 
       // Create access token
       let token = AccessTokenData::new(
         user_id.clone(),
         device_id,
         crate::token::AuthType::Password,
         &mut OsRng,
       );
 
       let access_token = token.access_token.clone();
 
       self
         .client
         .put_access_token_data(token)
         .await
         .map_err(handle_db_error)?;
 
       let response = RegistrationFinishResponse {
         user_id,
         access_token,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn update_user_password_start(
     &self,
     request: tonic::Request<UpdateUserPasswordStartRequest>,
   ) -> Result<tonic::Response<UpdateUserPasswordStartResponse>, tonic::Status>
   {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key,
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     let server_registration = comm_opaque2::server::Registration::new();
     let server_message = server_registration
       .start(
         &CONFIG.server_setup,
         &message.opaque_registration_request,
         message.user_id.as_bytes(),
       )
       .map_err(protocol_error_to_grpc_status)?;
 
     let update_state = UpdateState {
       user_id: message.user_id,
     };
     let session_id = generate_uuid();
     self
       .cache
       .insert(session_id.clone(), WorkflowInProgress::Update(update_state))
       .await;
 
     let response = UpdateUserPasswordStartResponse {
       session_id,
       opaque_registration_response: server_message,
     };
     Ok(Response::new(response))
   }
 
   async fn update_user_password_finish(
     &self,
     request: tonic::Request<UpdateUserPasswordFinishRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Update(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       let server_registration = comm_opaque2::server::Registration::new();
       let password_file = server_registration
         .finish(&message.opaque_registration_upload)
         .map_err(protocol_error_to_grpc_status)?;
 
       self
         .client
         .update_user_password(state.user_id, password_file)
         .await
         .map_err(handle_db_error)?;
 
       let response = Empty {};
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn login_password_user_start(
     &self,
     request: tonic::Request<OpaqueLoginStartRequest>,
   ) -> Result<tonic::Response<OpaqueLoginStartResponse>, tonic::Status> {
     let message = request.into_inner();
 
     debug!("Attempting to login user: {:?}", &message.username);
     let user_id_and_password_file = self
       .client
       .get_user_id_and_password_file_from_username(&message.username)
       .await
       .map_err(handle_db_error)?;
 
     let (user_id, password_file_bytes) =
       if let Some(data) = user_id_and_password_file {
         data
       } else {
         // It's possible that the user attempting login is already registered
         // on Ashoat's keyserver. If they are, we should send back a gRPC status
         // code instructing them to get a signed message from Ashoat's keyserver
         // in order to claim their username and register with the Identity
         // service.
         let username_in_reserved_usernames_table = self
           .client
           .username_in_reserved_usernames_table(&message.username)
           .await
           .map_err(handle_db_error)?;
 
         if username_in_reserved_usernames_table {
           return Err(tonic::Status::failed_precondition(
             "need keyserver message to claim username",
           ));
         }
 
         return Err(tonic::Status::not_found("user not found"));
       };
 
     if let client_proto::OpaqueLoginStartRequest {
       opaque_login_request: login_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
     } = message
     {
       let mut server_login = comm_opaque2::server::Login::new();
       let server_response = server_login
         .start(
           &CONFIG.server_setup,
           &password_file_bytes,
           &login_message,
           username.as_bytes(),
         )
         .map_err(protocol_error_to_grpc_status)?;
 
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let login_state = UserLoginInfo {
         user_id,
         opaque_server_login: server_login,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Login(Box::new(login_state)),
         )
         .await;
 
       let response = Response::new(OpaqueLoginStartResponse {
         session_id,
         opaque_login_response: server_response,
       });
       Ok(response)
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn login_password_user_finish(
     &self,
     request: tonic::Request<OpaqueLoginFinishRequest>,
   ) -> Result<tonic::Response<OpaqueLoginFinishResponse>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Login(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       let mut server_login = state.opaque_server_login.clone();
       server_login
         .finish(&message.opaque_login_upload)
         .map_err(protocol_error_to_grpc_status)?;
 
       self
         .client
         .add_password_user_device_to_users_table(
           state.user_id.clone(),
           state.flattened_device_key_upload.clone(),
         )
         .await
         .map_err(handle_db_error)?;
 
       // Create access token
       let token = AccessTokenData::new(
         state.user_id.clone(),
         state.flattened_device_key_upload.device_id_key,
         crate::token::AuthType::Password,
         &mut OsRng,
       );
 
       let access_token = token.access_token.clone();
 
       self
         .client
         .put_access_token_data(token)
         .await
         .map_err(handle_db_error)?;
 
       let response = OpaqueLoginFinishResponse {
         user_id: state.user_id,
         access_token,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn login_wallet_user(
     &self,
     request: tonic::Request<WalletLoginRequest>,
   ) -> Result<tonic::Response<WalletLoginResponse>, tonic::Status> {
     let message = request.into_inner();
 
     let wallet_address = parse_and_verify_siwe_message(
       &message.siwe_message,
       &message.siwe_signature,
     )?;
 
     let (flattened_device_key_upload, social_proof) =
       if let client_proto::WalletLoginRequest {
         siwe_message: _,
         siwe_signature: _,
         device_key_upload:
           Some(client_proto::DeviceKeyUpload {
             device_key_info:
               Some(client_proto::IdentityKeyInfo {
                 payload,
                 payload_signature,
                 social_proof: Some(social_proof),
               }),
             content_upload:
               Some(client_proto::PreKey {
                 pre_key: content_prekey,
                 pre_key_signature: content_prekey_signature,
               }),
             notif_upload:
               Some(client_proto::PreKey {
                 pre_key: notif_prekey,
                 pre_key_signature: notif_prekey_signature,
               }),
             one_time_content_prekeys,
             one_time_notif_prekeys,
             device_type,
           }),
       } = message
       {
         let key_info = KeyPayload::from_str(&payload)
           .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
         (
           FlattenedDeviceKeyUpload {
             device_id_key: key_info.primary_identity_public_keys.ed25519,
             key_payload: payload,
             key_payload_signature: payload_signature,
             content_prekey,
             content_prekey_signature,
             content_one_time_keys: one_time_content_prekeys,
             notif_prekey,
             notif_prekey_signature,
             notif_one_time_keys: one_time_notif_prekeys,
             device_type: Device::try_from(device_type)
               .map_err(handle_db_error)?,
           },
           social_proof,
         )
       } else {
         return Err(tonic::Status::invalid_argument("unexpected message data"));
       };
 
     let user_id = match self
       .client
       .get_user_id_from_user_info(wallet_address.clone(), &AuthType::Wallet)
       .await
       .map_err(handle_db_error)?
     {
       Some(id) => {
         // User already exists, so we should update the DDB item
         self
           .client
           .add_wallet_user_device_to_users_table(
             id.clone(),
             flattened_device_key_upload.clone(),
             social_proof,
           )
           .await
           .map_err(handle_db_error)?;
         id
       }
       None => {
         // User doesn't exist yet, so we should add a new user in DDB
         self
           .client
           .add_wallet_user_to_users_table(
             flattened_device_key_upload.clone(),
             wallet_address,
             social_proof,
           )
           .await
           .map_err(handle_db_error)?
       }
     };
 
     // Create access token
     let token = AccessTokenData::new(
       user_id.clone(),
       flattened_device_key_upload.device_id_key,
       crate::token::AuthType::Password,
       &mut OsRng,
     );
 
     let access_token = token.access_token.clone();
 
     self
       .client
       .put_access_token_data(token)
       .await
       .map_err(handle_db_error)?;
 
     let response = WalletLoginResponse {
       user_id,
       access_token,
     };
     Ok(Response::new(response))
   }
 
   async fn log_out_user(
     &self,
     request: tonic::Request<LogoutRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     self
       .client
       .remove_device_from_users_table(
         message.user_id.clone(),
         message.device_id_key.clone(),
       )
       .await
       .map_err(handle_db_error)?;
 
     self
       .client
       .delete_access_token_data(message.user_id, message.device_id_key)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
 
     Ok(Response::new(response))
   }
 
   async fn delete_user(
     &self,
     request: tonic::Request<DeleteUserRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key,
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     self
       .client
       .delete_user(message.user_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
 
     Ok(Response::new(response))
   }
 
   async fn generate_nonce(
     &self,
     _request: tonic::Request<Empty>,
   ) -> Result<tonic::Response<GenerateNonceResponse>, tonic::Status> {
     let nonce_data = generate_nonce_data(&mut OsRng);
     match self
       .client
       .add_nonce_to_nonces_table(nonce_data.clone())
       .await
     {
       Ok(_) => Ok(Response::new(GenerateNonceResponse {
         nonce: nonce_data.nonce,
       })),
       Err(e) => Err(handle_db_error(e)),
     }
   }
 
   async fn get_outbound_keys_for_user(
     &self,
     request: tonic::Request<OutboundKeysForUserRequest>,
   ) -> Result<tonic::Response<OutboundKeysForUserResponse>, tonic::Status> {
     let message = request.into_inner();
 
     use outbound_keys_for_user_request::Identifier;
     let (user_ident, auth_type) = match message.identifier {
       None => {
         return Err(tonic::Status::invalid_argument("no identifier provided"))
       }
       Some(Identifier::Username(username)) => (username, AuthType::Password),
       Some(Identifier::WalletAddress(address)) => (address, AuthType::Wallet),
     };
 
     let devices_map = self
       .client
       .get_keys_for_user(user_ident, &auth_type, true)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| match auth_type {
         AuthType::Password => tonic::Status::not_found("username not found"),
         AuthType::Wallet => {
           tonic::Status::not_found("wallet address not found")
         }
       })?;
 
     let transformed_devices = devices_map
       .into_iter()
       .filter_map(|(key, device_info)| {
         let device_info_with_auth = DeviceInfoWithAuth {
           device_info,
           auth_type: &auth_type,
         };
         match OutboundKeyInfo::try_from(device_info_with_auth) {
           Ok(key_info) => Some((key, key_info)),
           Err(_) => {
             error!("Failed to transform device info for key {}", key);
             None
           }
         }
       })
       .collect::<HashMap<_, _>>();
 
     Ok(tonic::Response::new(OutboundKeysForUserResponse {
       devices: transformed_devices,
     }))
   }
 
   async fn get_inbound_keys_for_user(
     &self,
     request: tonic::Request<InboundKeysForUserRequest>,
   ) -> Result<tonic::Response<InboundKeysForUserResponse>, tonic::Status> {
     let message = request.into_inner();
 
     use inbound_keys_for_user_request::Identifier;
     let (user_ident, auth_type) = match message.identifier {
       None => {
         return Err(tonic::Status::invalid_argument("no identifier provided"))
       }
       Some(Identifier::Username(username)) => (username, AuthType::Password),
       Some(Identifier::WalletAddress(address)) => (address, AuthType::Wallet),
     };
 
     let devices_map = self
       .client
       .get_keys_for_user(user_ident, &auth_type, false)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| match auth_type {
         AuthType::Password => tonic::Status::not_found("username not found"),
         AuthType::Wallet => {
           tonic::Status::not_found("wallet address not found")
         }
       })?;
 
     let transformed_devices = devices_map
       .into_iter()
       .filter_map(|(key, device_info)| {
         let device_info_with_auth = DeviceInfoWithAuth {
           device_info,
           auth_type: &auth_type,
         };
         match InboundKeyInfo::try_from(device_info_with_auth) {
           Ok(key_info) => Some((key, key_info)),
           Err(_) => {
             error!("Failed to transform device info for key {}", key);
             None
           }
         }
       })
       .collect::<HashMap<_, _>>();
 
     Ok(tonic::Response::new(InboundKeysForUserResponse {
       devices: transformed_devices,
     }))
   }
 
   async fn upload_one_time_keys(
     &self,
     request: tonic::Request<UploadOneTimeKeysRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     debug!("Validating token: {:?}", message);
     let token_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_valid {
       return Err(tonic::Status::unauthenticated("Invalid token"));
     }
 
     debug!(
       "Attempting to update one time keys for user: {}",
       message.user_id
     );
     self
       .client
       .append_one_time_prekeys(
         message.device_id,
         message.content_one_time_pre_keys,
         message.notif_one_time_pre_keys,
       )
       .await
       .map_err(handle_db_error)?;
 
     Ok(tonic::Response::new(Empty {}))
   }
 
   async fn refresh_user_pre_keys(
     &self,
     _request: tonic::Request<RefreshUserPreKeysRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     unimplemented!();
   }
 
   async fn verify_user_access_token(
     &self,
     request: tonic::Request<VerifyUserAccessTokenRequest>,
   ) -> Result<tonic::Response<VerifyUserAccessTokenResponse>, tonic::Status> {
     let message = request.into_inner();
     debug!("Verifying device: {}", &message.signing_public_key);
 
     let token_valid = self
       .client
       .verify_access_token(
         message.user_id,
         message.signing_public_key.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(VerifyUserAccessTokenResponse { token_valid });
     debug!(
       "device {} was verified: {}",
       &message.signing_public_key, token_valid
     );
     Ok(response)
   }
 
   async fn add_reserved_usernames(
     &self,
     request: tonic::Request<AddReservedUsernamesRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let usernames = validate_add_reserved_usernames_message(
       &message.message,
       &message.signature,
     )?;
 
     let filtered_usernames = self
       .client
       .filter_out_taken_usernames(usernames)
       .await
       .map_err(handle_db_error)?;
 
     self
       .client
       .add_usernames_to_reserved_usernames_table(filtered_usernames)
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(Empty {});
     Ok(response)
   }
 
   async fn remove_reserved_username(
     &self,
     request: tonic::Request<RemoveReservedUsernameRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let username = validate_remove_reserved_username_message(
       &message.message,
       &message.signature,
     )?;
 
     self
       .client
       .delete_username_from_reserved_usernames_table(username)
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(Empty {});
     Ok(response)
   }
 }
 
 pub fn handle_db_error(db_error: DBError) -> tonic::Status {
   match db_error {
     DBError::AwsSdk(DynamoDBError::InternalServerError(_))
     | DBError::AwsSdk(DynamoDBError::ProvisionedThroughputExceededException(
       _,
     ))
     | DBError::AwsSdk(DynamoDBError::RequestLimitExceeded(_)) => {
       tonic::Status::unavailable("please retry")
     }
     e => {
       error!("Encountered an unexpected error: {}", e);
       tonic::Status::failed_precondition("unexpected error")
     }
   }
 }
diff --git a/services/identity/src/reserved_users.rs b/services/identity/src/reserved_users.rs
index 0a6799333..6178238c2 100644
--- a/services/identity/src/reserved_users.rs
+++ b/services/identity/src/reserved_users.rs
@@ -1,114 +1,164 @@
 use base64::{engine::general_purpose, Engine as _};
 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;
 
 use crate::config::CONFIG;
 
 // This type should not be changed without making equivalent changes to
 // `ReservedUsernameMessage` in lib/types/crypto-types.js
 #[derive(Deserialize)]
 #[serde(rename_all = "camelCase")]
 struct Message<T> {
   statement: String,
   payload: T,
   issued_at: String,
 }
 
 fn validate_and_decode_message<T: serde::de::DeserializeOwned>(
   keyserver_message: &str,
   keyserver_signature: &str,
   expected_statement: &[u8],
 ) -> Result<Message<T>, Status> {
   let deserialized_message: Message<T> =
     serde_json::from_str(keyserver_message)
       .map_err(|_| Status::invalid_argument("message format invalid"))?;
 
   if !constant_time_eq(
     deserialized_message.statement.as_bytes(),
     expected_statement,
   ) {
     return Err(Status::invalid_argument("message invalid"));
   }
 
   let issued_at: DateTime<Utc> = deserialized_message
     .issued_at
     .parse()
     .map_err(|_| Status::invalid_argument("message format invalid"))?;
 
   let now = Utc::now();
   if (now - issued_at).num_seconds() > 5 {
     return Err(Status::invalid_argument("message invalid"));
   }
 
   let signature_bytes = general_purpose::STANDARD_NO_PAD
     .decode(keyserver_signature)
     .map_err(|_| Status::invalid_argument("signature invalid"))?;
 
   let signature = Signature::from_bytes(&signature_bytes)
     .map_err(|_| Status::invalid_argument("signature invalid"))?;
 
   let public_key_string = CONFIG
     .keyserver_public_key
     .clone()
     .ok_or_else(|| Status::failed_precondition("missing key"))?;
 
   let public_key_bytes = general_purpose::STANDARD_NO_PAD
     .decode(public_key_string)
     .map_err(|_| Status::failed_precondition("malformed key"))?;
 
   let public_key: PublicKey = PublicKey::from_bytes(&public_key_bytes)
     .map_err(|_| Status::failed_precondition("malformed key"))?;
 
   public_key
     .verify(keyserver_message.as_bytes(), &signature)
     .map_err(|_| Status::permission_denied("verification failed"))?;
 
   Ok(deserialized_message)
 }
 
 pub fn validate_signed_account_ownership_message(
   username: &str,
   keyserver_message: &str,
   keyserver_signature: &str,
 ) -> Result<(), Status> {
   let deserialized_message = validate_and_decode_message::<String>(
     keyserver_message,
     keyserver_signature,
     b"This user is the owner of the following username",
   )?;
 
   if deserialized_message.payload != username {
     return Err(Status::invalid_argument("message invalid"));
   }
 
   Ok(())
 }
 
 pub fn validate_add_reserved_usernames_message(
   keyserver_message: &str,
   keyserver_signature: &str,
 ) -> Result<Vec<String>, Status> {
   let deserialized_message = validate_and_decode_message::<Vec<String>>(
     keyserver_message,
     keyserver_signature,
     b"Add the following usernames to reserved list",
   )?;
 
   Ok(deserialized_message.payload)
 }
 
 pub fn validate_remove_reserved_username_message(
   keyserver_message: &str,
   keyserver_signature: &str,
 ) -> Result<String, Status> {
   let deserialized_message = validate_and_decode_message::<String>(
     keyserver_message,
     keyserver_signature,
     b"Remove the following username from reserved list",
   )?;
 
   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);
+  }
+}