diff --git a/services/comm-services-lib/src/blob/client.rs b/services/comm-services-lib/src/blob/client.rs
index 7d2eb0644..b81df219e 100644
--- a/services/comm-services-lib/src/blob/client.rs
+++ b/services/comm-services-lib/src/blob/client.rs
@@ -1,323 +1,393 @@
 use derive_more::{Display, Error, From};
 use futures_core::Stream;
 use futures_util::{StreamExt, TryStreamExt};
 use reqwest::{
   multipart::{Form, Part},
-  Body,
+  Body, Method, RequestBuilder,
 };
-use tracing::{debug, trace, warn};
+use tracing::{debug, error, trace, warn};
 
 // publicly re-export some reqwest types
 pub use reqwest::Error as ReqwestError;
 pub use reqwest::StatusCode;
 pub use reqwest::Url;
 
+use crate::auth::UserIdentity;
+
 #[derive(From, Error, Debug, Display)]
 pub enum BlobServiceError {
   /// HTTP Client errors, this includes:
   /// - connection failures
   /// - request errors (e.g. upload input stream)
   #[display(...)]
   ClientError(ReqwestError),
   /// Invalid Blob service URL provided
   #[display(...)]
   URLError(#[error(ignore)] String),
   /// Blob service returned HTTP 404
   /// - blob or holder not found
   #[display(...)]
   NotFound,
   /// Blob service returned HTTP 409
   /// - blob or holder already exists
   #[display(...)]
   AlreadyExists,
   /// Blob service returned HTTP 400
   /// - invalid holder or blob_hash format
   #[display(...)]
   InvalidArguments,
   /// Blob service returned HTTP 50x
   #[display(...)]
   ServerError,
   #[display(...)]
   UnexpectedHttpStatus(#[error(ignore)] reqwest::StatusCode),
+  #[display(...)]
+  UnexpectedError,
 }
 
 /// A client interface to Blob service.
 //
 /// The `BlobServiceClient` holds a connection pool internally, so it is advised that
 /// you create one and **reuse** it, by **cloning**.
 ///
+/// A clone is recommended for each individual client identity, that has
+/// a different `UserIdentity`.
+///
+/// # Example
+/// ```ignore
+/// // create client for user A
+/// let clientA = BlobServiceClient::new(blob_endpoint).with_user_identity(userA);
+///
+/// // reuse the client connection with different credentials
+/// let clientB = clientA.with_user_identity(userB);
+///
+/// // clientA still uses userA credentials
+/// ```
+///
+/// A clone is recommended when the client concurrently handles multiple identities -
+/// e.g. a HTTP service handling requests from different users. The `with_user_identity()`
+/// method should be used for this purpose.
+///
 /// You should **not** wrap the `BlobServiceClient` in an `Rc` or `Arc` to **reuse** it,
 /// because it already uses an `Arc` internally.
 #[derive(Clone)]
 pub struct BlobServiceClient {
   http_client: reqwest::Client,
   blob_service_url: reqwest::Url,
+  user_identity: Option<UserIdentity>,
 }
 
 impl BlobServiceClient {
+  /// Creates a new Blob Service client instance. It is unauthenticated by default
+  /// so you need to call `with_user_identity()` afterwards:
+  /// ```ignore
+  /// let client = BlobServiceClient::new(blob_endpoint).with_user_identity(user);
+  /// ```
+  ///
+  /// **Note**: It is advised to create this client once and reuse by **cloning**.
+  /// See [`BlobServiceClient`] docs for details
   pub fn new(blob_service_url: reqwest::Url) -> Self {
     debug!("Creating BlobServiceClient. URL: {}", blob_service_url);
     Self {
       http_client: reqwest::Client::new(),
       blob_service_url,
+      user_identity: None,
     }
   }
 
+  /// Clones the client and sets the [`UserIdentity`] for the new instance.
+  /// This allows the client to reuse the same connection pool for different users.
+  pub fn with_user_identity(&self, user_identity: UserIdentity) -> Self {
+    trace!("Set user_identity: {:?}", &user_identity);
+    let mut this = self.clone();
+    this.user_identity = Some(user_identity);
+    this
+  }
+
   /// Downloads blob with given [`blob_hash`].
   ///
   /// @returns a stream of blob bytes
   ///
   /// # Errors thrown
   /// - [BlobServiceError::NotFound] if blob with given hash does not exist
   /// - [BlobServiceError::InvalidArguments] if blob hash has incorrect format
   ///
   /// # Example
   /// ```ignore
   /// let client =
   ///   BlobServiceClient::new("http://localhost:50053".parse()?);
   ///
   /// let mut stream = client.get("hello").await?;
   /// while let Some(data) = stream.try_next().await? {
   ///   println!("Got data: {:?}", data);
   /// }
   /// ```
   pub async fn get(
     &self,
     blob_hash: &str,
   ) -> BlobResult<impl Stream<Item = BlobResult<Vec<u8>>>> {
     debug!(?blob_hash, "Get blob request");
     let url = self.get_blob_url(Some(blob_hash))?;
 
     let response = self
-      .http_client
-      .get(url)
+      .request(Method::GET, url)?
       .send()
       .await
       .map_err(BlobServiceError::ClientError)?;
 
     debug!("Response status: {}", response.status());
     if response.status().is_success() {
       let stream = response.bytes_stream().map(|result| match result {
         Ok(bytes) => Ok(bytes.into()),
         Err(error) => {
           warn!("Error while streaming response: {}", error);
           Err(BlobServiceError::ClientError(error))
         }
       });
       return Ok(stream);
     }
 
     let error = handle_http_error(response.status());
     if let Ok(message) = response.text().await {
       trace!("Error response message: {}", message);
     }
     Err(error)
   }
 
   /// Assigns a new holder to a blob represented by [`blob_hash`].
   /// Returns `BlobServiceError::AlreadyExists` if blob already has
   /// a holder with given [`holder`] name.
   pub async fn assign_holder(
     &self,
     blob_hash: &str,
     holder: &str,
   ) -> BlobResult<bool> {
     debug!("Assign holder request");
     let url = self.get_blob_url(None)?;
 
     let payload = AssignHolderRequest {
       holder: holder.to_string(),
       blob_hash: blob_hash.to_string(),
     };
     debug!("Request payload: {:?}", payload);
-    let response = self.http_client.post(url).json(&payload).send().await?;
+    let response = self
+      .request(Method::POST, url)?
+      .json(&payload)
+      .send()
+      .await?;
 
     debug!("Response status: {}", response.status());
     if response.status().is_success() {
       let AssignHolderResponse { data_exists } = response.json().await?;
       trace!("Data exists: {}", data_exists);
       return Ok(data_exists);
     }
 
     let error = handle_http_error(response.status());
     if let Ok(message) = response.text().await {
       trace!("Error response message: {}", message);
     }
     Err(error)
   }
 
   /// Revokes given holder from a blob represented by [`blob_hash`].
   /// Returns `BlobServiceError::NotFound` if blob with given hash does not exist
   /// or it does not have such holder
   pub async fn revoke_holder(
     &self,
     blob_hash: &str,
     holder: &str,
   ) -> BlobResult<()> {
     debug!("Revoke holder request");
     let url = self.get_blob_url(None)?;
 
     let payload = RevokeHolderRequest {
       holder: holder.to_string(),
       blob_hash: blob_hash.to_string(),
     };
     debug!("Request payload: {:?}", payload);
 
-    let response = self.http_client.delete(url).json(&payload).send().await?;
+    let response = self
+      .request(Method::DELETE, url)?
+      .json(&payload)
+      .send()
+      .await?;
     debug!("Response status: {}", response.status());
 
     if response.status().is_success() {
       trace!("Revoke holder request successful");
       return Ok(());
     }
 
     let error = handle_http_error(response.status());
     if let Ok(message) = response.text().await {
       trace!("Error response message: {}", message);
     }
     Err(error)
   }
 
   /// Uploads a blob. Returns `BlobServiceError::AlreadyExists` if blob with given hash
   /// already exists.
   ///
   /// # Example
   /// ```ignore
   /// use std::io::{Error, ErrorKind};
   ///
   /// let client =
   ///   BlobServiceClient::new("http://localhost:50053".parse()?);
   ///
   /// let stream = async_stream::stream! {
   ///   yield Ok(vec![1, 2, 3]);
   ///   yield Ok(vec![4, 5, 6]);
   ///   yield Err(Error::new(ErrorKind::Other, "Oops"));
   /// };
   /// client.upload_blob(&blob_hash, stream).await?;
   /// ```
   pub async fn upload_blob<H, S>(
     &self,
     blob_hash: H,
     data_stream: S,
   ) -> BlobResult<()>
   where
     H: Into<String>,
     S: futures_core::stream::TryStream + Send + Sync + 'static,
     S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
     Vec<u8>: From<S::Ok>,
   {
     debug!("Upload blob request");
     let url = self.get_blob_url(None)?;
 
     let stream = data_stream.map_ok(Vec::from);
     let streaming_body = Body::wrap_stream(stream);
     let form = Form::new()
       .text("blob_hash", blob_hash.into())
       .part("blob_data", Part::stream(streaming_body));
 
-    let response = self.http_client.put(url).multipart(form).send().await?;
+    let response = self
+      .request(Method::PUT, url)?
+      .multipart(form)
+      .send()
+      .await?;
     debug!("Response status: {}", response.status());
 
     if response.status().is_success() {
       trace!("Blob upload successful");
       return Ok(());
     }
 
     let error = handle_http_error(response.status());
     if let Ok(message) = response.text().await {
       trace!("Error response message: {}", message);
     }
     Err(error)
   }
 
   /// A wrapper around [`BlobServiceClient::assign_holder`] and [`BlobServiceClient::upload_blob`].
   ///
   /// Assigns a new holder to a blob represented by [`blob_hash`]. If the blob does not exist,
   /// uploads the data from [`data_stream`].
   pub async fn simple_put<S>(
     &self,
     blob_hash: &str,
     holder: &str,
     data_stream: S,
   ) -> BlobResult<bool>
   where
     S: futures_core::stream::TryStream + Send + Sync + 'static,
     S::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
     Vec<u8>: From<S::Ok>,
   {
     trace!("Begin simple put. Assigning holder...");
     let data_exists = self.assign_holder(blob_hash, holder).await?;
     if data_exists {
       trace!("Blob data already exists. Skipping upload.");
       return Ok(false);
     }
     trace!("Uploading blob data...");
     let Err(upload_error) = self.upload_blob(blob_hash, data_stream).await else {
       return Ok(true);
     };
 
     trace!(%blob_hash, %holder, "Revoking holder due to upload failure");
     self.schedule_revoke_holder(blob_hash, holder);
     Err(upload_error)
   }
 
   /// Revokes holder in a separate task. Useful to clean up after
   /// upload failure without blocking the current task.
   pub fn schedule_revoke_holder(
     &self,
     blob_hash: impl Into<String>,
     holder: impl Into<String>,
   ) {
     let this = self.clone();
     let blob_hash: String = blob_hash.into();
     let holder: String = holder.into();
     tokio::spawn(async move {
       if let Err(err) = this.revoke_holder(&blob_hash, &holder).await {
         warn!("Failed to revoke holder: {0:?} - {0}", err);
       }
     });
   }
 }
 
 // private helper methods
 impl BlobServiceClient {
   fn get_blob_url(
     &self,
     blob_hash: Option<&str>,
   ) -> Result<Url, BlobServiceError> {
     let path = match blob_hash {
       Some(hash) => format!("/blob/{}", hash),
       None => "/blob".to_string(),
     };
     let url = self
       .blob_service_url
       .join(&path)
       .map_err(|err| BlobServiceError::URLError(err.to_string()))?;
     trace!("Constructed request URL: {}", url);
     Ok(url)
   }
+
+  fn request(
+    &self,
+    http_method: Method,
+    url: Url,
+  ) -> BlobResult<RequestBuilder> {
+    let request = self.http_client.request(http_method, url);
+    match &self.user_identity {
+      Some(user) => {
+        let token = user.as_authorization_token().map_err(|e| {
+          error!("Failed to parse authorization token: {}", e);
+          BlobServiceError::UnexpectedError
+        })?;
+        Ok(request.bearer_auth(token))
+      }
+      None => Ok(request),
+    }
+  }
 }
 
 fn handle_http_error(status_code: StatusCode) -> BlobServiceError {
   match status_code {
     StatusCode::BAD_REQUEST => BlobServiceError::InvalidArguments,
     StatusCode::NOT_FOUND => BlobServiceError::NotFound,
     StatusCode::CONFLICT => BlobServiceError::AlreadyExists,
     code if code.is_server_error() => BlobServiceError::ServerError,
     code => BlobServiceError::UnexpectedHttpStatus(code),
   }
 }
 
 type BlobResult<T> = Result<T, BlobServiceError>;
 
 #[derive(serde::Deserialize)]
 struct AssignHolderResponse {
   data_exists: bool,
 }
 #[derive(Debug, serde::Serialize)]
 struct AssignHolderRequest {
   blob_hash: String,
   holder: String,
 }
 // they have the same layout so we can simply alias
 type RevokeHolderRequest = AssignHolderRequest;