diff --git a/wp-includes/blocks.php b/wp-includes/blocks.php
index b04696d591..2ec3a07e3e 100644
--- a/wp-includes/blocks.php
+++ b/wp-includes/blocks.php
@@ -7,6 +7,39 @@
  * @since 5.0.0
  */
 
+/**
+ * Registers a block type.
+ *
+ * @since 5.0.0
+ *
+ * @param string|WP_Block_Type $name Block type name including namespace, or alternatively a
+ *                                   complete WP_Block_Type instance. In case a WP_Block_Type
+ *                                   is provided, the $args parameter will be ignored.
+ * @param array                $args {
+ *     Optional. Array of block type arguments. Any arguments may be defined, however the
+ *     ones described below are supported by default. Default empty array.
+ *
+ *     @type callable $render_callback Callback used to render blocks of this block type.
+ * }
+ * @return WP_Block_Type|false The registered block type on success, or false on failure.
+ */
+function register_block_type( $name, $args = array() ) {
+	return WP_Block_Type_Registry::get_instance()->register( $name, $args );
+}
+
+/**
+ * Unregisters a block type.
+ *
+ * @since 5.0.0
+ *
+ * @param string|WP_Block_Type $name Block type name including namespace, or alternatively a
+ *                                   complete WP_Block_Type instance.
+ * @return WP_Block_Type|false The unregistered block type on success, or false on failure.
+ */
+function unregister_block_type( $name ) {
+	return WP_Block_Type_Registry::get_instance()->unregister( $name );
+}
+
 /**
  * Determine whether a post or content string has blocks.
  *
@@ -59,3 +92,23 @@ function has_block( $block_type, $post = null ) {
 
 	return false !== strpos( $post, '<!-- wp:' . $block_type . ' ' );
 }
+
+/**
+ * Returns an array of the names of all registered dynamic block types.
+ *
+ * @since 5.0.0
+ *
+ * @return array Array of dynamic block names.
+ */
+function get_dynamic_block_names() {
+	$dynamic_block_names = array();
+
+	$block_types = WP_Block_Type_Registry::get_instance()->get_all_registered();
+	foreach ( $block_types as $block_type ) {
+		if ( $block_type->is_dynamic() ) {
+			$dynamic_block_names[] = $block_type->name;
+		}
+	}
+
+	return $dynamic_block_names;
+}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9ed74b60d7..f2d60aa40e 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44108';
+$wp_version = '5.1-alpha-44109';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.