diff --git a/plume-models/src/instance.rs b/plume-models/src/instance.rs
index bf3d3929..f77447d5 100644
--- a/plume-models/src/instance.rs
+++ b/plume-models/src/instance.rs
@@ -42,6 +42,7 @@ pub struct NewInstance {
 
 lazy_static! {
     static ref LOCAL_INSTANCE: RwLock<Option<Instance>> = RwLock::new(None);
+    static ref INSTANCE_USER: RwLock<Option<User>> = RwLock::new(None);
 }
 
 impl Instance {
@@ -57,6 +58,14 @@ impl Instance {
             .ok_or(Error::NotFound)
     }
 
+    pub fn set_local_user(u: User) {
+        INSTANCE_USER.write().unwrap().replace(u);
+    }
+
+    pub fn get_local_user() -> Result<User> {
+        INSTANCE_USER.read().unwrap().clone().ok_or(Error::NotFound)
+    }
+
     pub fn get_local_uncached(conn: &Connection) -> Result<Instance> {
         instances::table
             .filter(instances::local.eq(true))
diff --git a/plume-models/src/schema.rs b/plume-models/src/schema.rs
index dc6d77fd..adde25e7 100644
--- a/plume-models/src/schema.rs
+++ b/plume-models/src/schema.rs
@@ -29,7 +29,6 @@ table! {
         is_owner -> Bool,
     }
 }
-
 table! {
     blogs (id) {
         id -> Int4,
diff --git a/plume-models/src/users.rs b/plume-models/src/users.rs
index 37e27885..d087ef8c 100644
--- a/plume-models/src/users.rs
+++ b/plume-models/src/users.rs
@@ -230,20 +230,28 @@ impl User {
     }
 
     fn fetch(url: &str) -> Result<CustomPerson> {
+        let mut headers = plume_common::activity_pub::request::headers();
+        headers.insert(
+            ACCEPT,
+            HeaderValue::from_str(
+                &ap_accept_header()
+                    .into_iter()
+                    .collect::<Vec<_>>()
+                    .join(", "),
+            )?,
+        );
+        let lu = Instance::get_local_user()?;
         let mut res = ClientBuilder::new()
             .connect_timeout(Some(std::time::Duration::from_secs(5)))
             .build()?
             .get(url)
+            .headers(headers.clone())
             .header(
-                ACCEPT,
-                HeaderValue::from_str(
-                    &ap_accept_header()
-                        .into_iter()
-                        .collect::<Vec<_>>()
-                        .join(", "),
-                )?,
+                "Signature",
+                plume_common::activity_pub::request::signature(&lu, &headers).expect(""),
             )
             .send()?;
+
         let text = &res.text()?;
         // without this workaround, publicKey is not correctly deserialized
         let ap_sign = serde_json::from_str::<ApSignature>(text)?;