diff --git a/services/comm-services-lib/src/blob/client.rs b/services/comm-services-lib/src/blob/client.rs
index 91bac5978..536c58119 100644
--- a/services/comm-services-lib/src/blob/client.rs
+++ b/services/comm-services-lib/src/blob/client.rs
@@ -1,198 +1,300 @@
 use derive_more::{Display, Error, From};
 use futures_core::Stream;
 use futures_util::{StreamExt, TryStreamExt};
 use reqwest::{
   multipart::{Form, Part},
   Body, Url,
 };
 use tracing::{debug, trace, warn};
 
 // publicly re-export some reqwest types
 pub use reqwest::Error as ReqwestError;
 pub use reqwest::StatusCode;
 
 #[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),
 }
 
 /// 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**.
 ///
 /// 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,
 }
 
 impl BlobServiceClient {
   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,
     }
   }
 
   /// 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
   /// ```rust
   /// 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)
       .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?;
+
+    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?;
+    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
   /// ```rust
   /// 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?;
     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...");
+    self.upload_blob(blob_hash, data_stream).await?;
+    Ok(true)
+  }
 }
 
 // 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 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;