diff --git a/plume-common/src/activity_pub/mod.rs b/plume-common/src/activity_pub/mod.rs
index 5fac258f..ea7850af 100644
--- a/plume-common/src/activity_pub/mod.rs
+++ b/plume-common/src/activity_pub/mod.rs
@@ -1,4 +1,12 @@
 use activitypub::{Activity, Link, Object};
+use activitystreams::{
+    activity::AsActivity,
+    actor::{ApActor, Group, Person},
+    iri_string::types::IriString,
+    object::{ApObject, Article},
+    unparsed::UnparsedMutExt,
+};
+use activitystreams_ext::{Ext1, UnparsedExtension};
 use array_tool::vec::Uniq;
 use reqwest::{header::HeaderValue, r#async::ClientBuilder, Url};
 use rocket::{
@@ -185,6 +193,82 @@ where
     rt.run().unwrap();
 }
 
+pub fn broadcast07<S, T, A, K, C>(sender: &S, act: A, to: Vec<T>, proxy: Option<reqwest::Proxy>)
+where
+    S: sign::Signer,
+    A: AsActivity<K> + serde::Serialize,
+    T: inbox::AsActor<C>,
+{
+    let boxes = to
+        .into_iter()
+        .map(|u| {
+            u.get_shared_inbox_url()
+                .unwrap_or_else(|| u.get_inbox_url())
+        })
+        .collect::<Vec<String>>()
+        .unique();
+
+    let mut act = serde_json::to_value(act).expect("activity_pub::broadcast: serialization error");
+    act["@context"] = context();
+    let signed = act
+        .sign(sender)
+        .expect("activity_pub::broadcast: signature error");
+
+    let mut rt = tokio::runtime::current_thread::Runtime::new()
+        .expect("Error while initializing tokio runtime for federation");
+    for inbox in boxes {
+        let body = signed.to_string();
+        let mut headers = request::headers();
+        let url = Url::parse(&inbox);
+        if url.is_err() {
+            warn!("Inbox is invalid URL: {:?}", &inbox);
+            continue;
+        }
+        let url = url.unwrap();
+        if !url.has_host() {
+            warn!("Inbox doesn't have host: {:?}", &inbox);
+            continue;
+        };
+        let host_header_value = HeaderValue::from_str(url.host_str().expect("Unreachable"));
+        if host_header_value.is_err() {
+            warn!("Header value is invalid: {:?}", url.host_str());
+            continue;
+        }
+        headers.insert("Host", host_header_value.unwrap());
+        headers.insert("Digest", request::Digest::digest(&body));
+        rt.spawn(
+            if let Some(proxy) = proxy.clone() {
+                ClientBuilder::new().proxy(proxy)
+            } else {
+                ClientBuilder::new()
+            }
+            .connect_timeout(std::time::Duration::from_secs(5))
+            .build()
+            .expect("Can't build client")
+            .post(&inbox)
+            .headers(headers.clone())
+            .header(
+                "Signature",
+                request::signature(sender, &headers, ("post", url.path(), url.query()))
+                    .expect("activity_pub::broadcast: request signature error"),
+            )
+            .body(body)
+            .send()
+            .and_then(move |r| {
+                if r.status().is_success() {
+                    debug!("Successfully sent activity to inbox ({})", &inbox);
+                } else {
+                    warn!("Error while sending to inbox ({:?})", &r)
+                }
+                r.into_body().concat2()
+            })
+            .map(move |response| debug!("Response: \"{:?}\"\n", response))
+            .map_err(|e| warn!("Error while sending to inbox ({:?})", e)),
+        );
+    }
+    rt.run().unwrap();
+}
+
 #[derive(Shrinkwrap, Clone, Serialize, Deserialize)]
 pub struct Id(String);
 
@@ -226,6 +310,41 @@ pub struct PublicKey {
     pub public_key_pem: Option<serde_json::Value>,
 }
 
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct ApSignature07 {
+    public_key: PublicKey07,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct PublicKey07 {
+    id: IriString,
+    owner: IriString,
+    public_key_pem: String,
+}
+
+impl<U> UnparsedExtension<U> for ApSignature07
+where
+    U: UnparsedMutExt,
+{
+    type Error = serde_json::Error;
+
+    fn try_from_unparsed(unparsed_mut: &mut U) -> Result<Self, Self::Error> {
+        Ok(ApSignature07 {
+            public_key: unparsed_mut.remove("publicKey")?,
+        })
+    }
+
+    fn try_into_unparsed(self, unparsed_mut: &mut U) -> Result<(), Self::Error> {
+        unparsed_mut.insert("publicKey", self.public_key)?;
+        Ok(())
+    }
+}
+
+pub type CustomPerson = Ext1<ApActor<Person>, ApSignature07>;
+pub type CustomGroup = Ext1<ApActor<Group>, ApSignature07>;
+
 #[derive(Clone, Debug, Default, UnitString)]
 #[activitystreams(Hashtag)]
 pub struct HashtagType;
@@ -262,6 +381,32 @@ pub struct Licensed {
 
 impl Object for Licensed {}
 
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+pub struct Licensed07 {
+    pub license: String,
+}
+
+impl<U> UnparsedExtension<U> for Licensed07
+where
+    U: UnparsedMutExt,
+{
+    type Error = serde_json::Error;
+
+    fn try_from_unparsed(unparsed_mut: &mut U) -> Result<Self, Self::Error> {
+        Ok(Licensed07 {
+            license: unparsed_mut.remove("license")?,
+        })
+    }
+
+    fn try_into_unparsed(self, unparsed_mut: &mut U) -> Result<(), Self::Error> {
+        unparsed_mut.insert("license", self.license)?;
+        Ok(())
+    }
+}
+
+pub type LicensedArticle = Ext1<ApObject<Article>, Licensed07>;
+
 #[cfg(test)]
 mod tests {
     use super::*;