diff --git a/.gitignore b/.gitignore
index 61ead86..c01a117 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /vendor
+/log
diff --git a/includes/init.php b/includes/init.php
index 0df30be..56462e1 100644
--- a/includes/init.php
+++ b/includes/init.php
@@ -1,6 +1,7 @@
 <?php
 namespace init;
 
+require_once plugin_dir_path( __FILE__ ) . 'util.php';
 require_once plugin_dir_path( __FILE__ ) . 'server/api.php';
 require_once plugin_dir_path( __FILE__ ) . 'server/actors.php';
 require_once plugin_dir_path( __FILE__ ) . 'schema.php';
@@ -19,12 +20,8 @@ add_action( 'user_register', function( $user_id ) {
 add_action( 'pterotype_init', function() {
     \schema\run_migrations();
     \actors\initialize_actors();
-    if ( WP_DEBUG ) {
-        $log_dir = plugin_dir_path( __FILE__ ) . '../log';
-        if ( ! file_exists( $log_dir ) ) {
-            mkdir( $log_dir, 0777, true );
-        }
-        file_put_contents( $log_dir, ob_get_contents() );
+    if ( ! empty( ob_get_contents() ) ) {
+        \util\log( 'init.log', ob_get_contents(), false );
     }
 } );
 
diff --git a/includes/server/actors.php b/includes/server/actors.php
index 29e7b55..6172c9e 100644
--- a/includes/server/actors.php
+++ b/includes/server/actors.php
@@ -8,7 +8,7 @@ function get_actor( $id ) {
     $row = $wpdb->get_row( $wpdb->prepare(
         "SELECT * FROM {$wpdb->prefix}pterotype_actors WHERE id = %d", $id
     ) );
-    return get_user_from_row( $row );
+    return get_actor_from_row( $row );
 }
 
 function get_actor_by_slug ( $slug ) {
@@ -48,7 +48,10 @@ function get_actor_from_row( $row ) {
 function get_blog_actor() {
     $actor_id = get_actor_id( PTEROTYPE_BLOG_ACTOR_SLUG );
     $actor = array(
-        '@context' => array( 'https://www.w3.org/ns/activitystreams' ),
+        '@context' => array(
+            'https://www.w3.org/ns/activitystreams',
+            'https://w3id.org/security/v1',
+        ),
         'type' => 'Organization',
         'id' => get_rest_url(
             null, sprintf( '/pterotype/v1/actor/%s', PTEROTYPE_BLOG_ACTOR_SLUG )
@@ -93,7 +96,10 @@ function get_user_actor( $user ) {
     $handle = get_the_author_meta( 'user_nicename', $user->get('ID'));
     $actor_id = get_actor_id( $handle );
     $actor = array(
-        '@context' => array( 'https://www.w3.org/ns/activitystreams' ),
+        '@context' => array(
+            'https://www.w3.org/ns/activitystreams',
+            'https://w3id.org/security/v1',
+        ),
         'type' => 'Person',
         'id' => get_rest_url( null, sprintf( '/pterotype/v1/actor/%s', $handle ) ),
         'following' => get_rest_url(
diff --git a/includes/server/deliver.php b/includes/server/deliver.php
index a60c0c1..6de9f3b 100644
--- a/includes/server/deliver.php
+++ b/includes/server/deliver.php
@@ -131,17 +131,21 @@ function post_activity_to_inboxes( $actor_id, $activity, $recipients ) {
             $request->add_header( 'Content-Type', 'application/ld+json' );
             $request->add_header( 'Signature', signature_header( $inbox, $actor_id ) );
             $server = rest_get_server();
-            $server->dispatch( $request );
+            $response = $server->dispatch( $request );
         } else {
             $args = array(
                 'body' => wp_json_encode( $activity ),
                 'headers' => array(
                     'Content-Type' => 'application/ld+json',
-                    'Signature' => get_signing_string( $inbox, $actor_id ),
+                    'Signature' => signature_header( $inbox, $actor_id ),
                 ),
                 'data_format' => 'body',
             );
-            wp_remote_post( $inbox, $args );
+            \util\log( 'debug.html', 'Request:', false );
+            \util\log_var( 'debug.html', $args );
+            $response = wp_remote_post( $inbox, $args );
+            \util\log( 'debug.html', 'Response:' );
+            \util\log_var( 'debug.html', $response );
         }
     }
 }
@@ -156,6 +160,10 @@ date: $now_str";
 }
 
 function signature_header( $inbox_url, $actor_id ) {
-    return \pgp\sign_data( get_signing_string( $inbox_url ), $actor_id );
+    $actor = \actors\get_actor( $actor_id );
+    $key_id = $actor['publicKey']['id'];
+    $signature = \pgp\sign_data( get_signing_string( $inbox_url ), $actor_id );
+    $headers = '(request-target) host date';
+    return "keyId=\"$key_id\",headers=\"$headers\",signature=\"$signature\"";
 }
 ?>
diff --git a/includes/util.php b/includes/util.php
index 3861007..18e17d3 100644
--- a/includes/util.php
+++ b/includes/util.php
@@ -95,4 +95,34 @@ function get_id( $object ) {
         return $object;
     }
 }
+
+function get_log_dir() {
+    return plugin_dir_path( __FILE__ ) . '../log';
+}
+
+function log( $log_file, $str, $append = true ) {
+    if ( ! WP_DEBUG ) {
+        return;
+    }
+    $log_dir = get_log_dir();
+    $log_file = '/' . $log_file;
+    if ( ! file_exists( $log_dir ) ) {
+        mkdir( $log_dir, 0777, true );
+    }
+    if ( $append ) {
+        file_put_contents( $log_dir . $log_file, $str, FILE_APPEND );
+    } else {
+        file_put_contents( $log_dir . $log_file, $str );
+    }
+}
+
+function log_var( $log_file, $var, $append = true ) {
+    if ( ! WP_DEBUG ) {
+        return;
+    }
+    ob_start();
+    var_dump( $var );
+    $dump = ob_get_clean();
+    log( $log_file, $dump, $append );
+}
 ?>