diff --git a/database.sql b/database.sql
index b986cc409f..1f35cd0573 100644
--- a/database.sql
+++ b/database.sql
@@ -1,6 +1,6 @@
 -- ------------------------------------------
 -- Friendica 2022.05-dev (Siberian Iris)
--- DB_UPDATE_VERSION 1454
+-- DB_UPDATE_VERSION 1455
 -- ------------------------------------------
 
 
@@ -1526,6 +1526,7 @@ CREATE TABLE IF NOT EXISTS `user-contact` (
 	`ignored` boolean COMMENT 'Posts from this contact are ignored',
 	`collapsed` boolean COMMENT 'Posts from this contact are collapsed',
 	`hidden` boolean COMMENT 'This contact is hidden from the others',
+	`is-blocked` boolean COMMENT 'User is blocked by this contact',
 	`pending` boolean COMMENT '',
 	`rel` tinyint unsigned COMMENT 'The kind of the relation between the user and the contact',
 	`info` mediumtext COMMENT '',
diff --git a/doc/database/db_user-contact.md b/doc/database/db_user-contact.md
index 2cd910bb05..30c80c5261 100644
--- a/doc/database/db_user-contact.md
+++ b/doc/database/db_user-contact.md
@@ -15,6 +15,7 @@ Fields
 | ignored                   | Posts from this contact are ignored                          | boolean            | YES  |     | NULL    |       |
 | collapsed                 | Posts from this contact are collapsed                        | boolean            | YES  |     | NULL    |       |
 | hidden                    | This contact is hidden from the others                       | boolean            | YES  |     | NULL    |       |
+| is-blocked                | User is blocked by this contact                              | boolean            | YES  |     | NULL    |       |
 | pending                   |                                                              | boolean            | YES  |     | NULL    |       |
 | rel                       | The kind of the relation between the user and the contact    | tinyint unsigned   | YES  |     | NULL    |       |
 | info                      |                                                              | mediumtext         | YES  |     | NULL    |       |
diff --git a/src/Model/Contact/User.php b/src/Model/Contact/User.php
index c39b1302a4..665b95624d 100644
--- a/src/Model/Contact/User.php
+++ b/src/Model/Contact/User.php
@@ -311,4 +311,48 @@ class User
 
 		return $collapsed;
 	}
+
+	/**
+	 * Set/Release that the user is blocked by the contact
+	 *
+	 * @param int     $cid     Either public contact id or user's contact id
+	 * @param int     $uid     User ID
+	 * @param boolean $blocked Is the user blocked or unblocked by the contact?
+	 * @throws \Exception
+	 */
+	public static function setIsBlocked($cid, $uid, $blocked)
+	{
+		$cdata = Contact::getPublicAndUserContactID($cid, $uid);
+		if (empty($cdata)) {
+			return;
+		}
+
+		DBA::update('user-contact', ['is-blocked' => $blocked], ['cid' => $cdata['public'], 'uid' => $uid], true);
+	}
+
+	/**
+	 * Returns if the user is blocked by the contact
+	 *
+	 * @param int $cid Either public contact id or user's contact id
+	 * @param int $uid User ID
+	 *
+	 * @return boolean Is the user blocked or unblocked by the contact?
+	 * @throws \Exception
+	 */
+	public static function isIsBlocked($cid, $uid)
+	{
+		$cdata = Contact::getPublicAndUserContactID($cid, $uid);
+		if (empty($cdata)) {
+			return false;
+		}
+
+		if (!empty($cdata['public'])) {
+			$public_contact = DBA::selectFirst('user-contact', ['is-blocked'], ['cid' => $cdata['public'], 'uid' => $uid]);
+			if (DBA::isResult($public_contact)) {
+				return $public_contact['is-blocked'];
+			}
+		}
+
+		return false;
+	}
 }
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 5caef7745e..5604043fa4 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -1206,6 +1206,52 @@ class Processor
 		Logger::info('Deleted contact', ['object' => $activity['object_id']]);
 	}
 
+	/**
+	 * Blocks the user by the contact
+	 *
+	 * @param array $activity
+	 * @throws \Exception
+	 */
+	public static function blockAccount($activity)
+	{
+		$cid = Contact::getIdForURL($activity['actor']);
+		if (empty($cid)) {
+			return;
+		}
+
+		$uid = User::getIdForURL($activity['object_id']);
+		if (empty($uid)) {
+			return;			
+		}
+
+		Contact\User::setIsBlocked($cid, $uid, true);
+
+		Logger::info('Contact blocked user', ['contact' => $cid, 'user' => $uid]);
+	}
+
+	/**
+	 * Unblocks the user by the contact
+	 *
+	 * @param array $activity
+	 * @throws \Exception
+	 */
+	public static function unblockAccount($activity)
+	{
+		$cid = Contact::getIdForURL($activity['actor']);
+		if (empty($cid)) {
+			return;
+		}
+
+		$uid = User::getIdForURL($activity['object_object']);
+		if (empty($uid)) {
+			return;			
+		}
+
+		Contact\User::setIsBlocked($cid, $uid, false);
+
+		Logger::info('Contact unblocked user', ['contact' => $cid, 'user' => $uid]);
+	}
+
 	/**
 	 * Accept a follow request
 	 *
diff --git a/src/Protocol/ActivityPub/Receiver.php b/src/Protocol/ActivityPub/Receiver.php
index 80bba0b0b9..caf97231fe 100644
--- a/src/Protocol/ActivityPub/Receiver.php
+++ b/src/Protocol/ActivityPub/Receiver.php
@@ -670,8 +670,7 @@ class Receiver
 
 			case 'as:Block':
 				if (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
-					// Used by Mastodon to announce that the sender has blocked the account
-					self::storeUnhandledActivity(false, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
+					ActivityPub\Processor::blockAccount($object_data);
 				} else {
 					self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
 				}
@@ -728,6 +727,9 @@ class Receiver
 				} elseif (($object_data['object_type'] == 'as:Accept') &&
 					in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
 					ActivityPub\Processor::rejectFollowUser($object_data);
+				} elseif (($object_data['object_type'] == 'as:Block') &&
+					in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
+					ActivityPub\Processor::unblockAccount($object_data);
 				} elseif (in_array($object_data['object_type'], array_merge(self::ACTIVITY_TYPES, ['as:Announce'])) &&
 					in_array($object_data['object_object_type'], array_merge(['as:Tombstone'], self::CONTENT_TYPES))) {
 					ActivityPub\Processor::undoActivity($object_data);
diff --git a/static/dbstructure.config.php b/static/dbstructure.config.php
index 36c9ca3e0a..95daab4649 100644
--- a/static/dbstructure.config.php
+++ b/static/dbstructure.config.php
@@ -55,7 +55,7 @@
 use Friendica\Database\DBA;
 
 if (!defined('DB_UPDATE_VERSION')) {
-	define('DB_UPDATE_VERSION', 1454);
+	define('DB_UPDATE_VERSION', 1455);
 }
 
 return [
@@ -1544,6 +1544,7 @@ return [
 			"ignored" => ["type" => "boolean", "comment" => "Posts from this contact are ignored"],
 			"collapsed" => ["type" => "boolean", "comment" => "Posts from this contact are collapsed"],
 			"hidden" => ["type" => "boolean", "comment" => "This contact is hidden from the others"],
+			"is-blocked" => ["type" => "boolean", "comment" => "User is blocked by this contact"],
 			"pending" => ["type" => "boolean", "comment" => ""],
 			"rel" => ["type" => "tinyint unsigned", "comment" => "The kind of the relation between the user and the contact"],
 			"info" => ["type" => "mediumtext", "comment" => ""],