diff --git a/packages/block-library/src/post-author/index.php b/packages/block-library/src/post-author/index.php
index 995bc26538864c..6dc30ea5b4ba18 100644
--- a/packages/block-library/src/post-author/index.php
+++ b/packages/block-library/src/post-author/index.php
@@ -23,10 +23,16 @@ function render_block_core_post_author() {
  * Registers the `core/post-author` block on the server.
  */
 function register_block_core_post_author() {
+	$path     = __DIR__ . '/post-author/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-author',
-		array(
-			'render_callback' => 'render_block_core_post_author',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_author',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-comments-count/index.php b/packages/block-library/src/post-comments-count/index.php
index 9dad7f28d40a5a..0c22f35068f175 100644
--- a/packages/block-library/src/post-comments-count/index.php
+++ b/packages/block-library/src/post-comments-count/index.php
@@ -32,15 +32,21 @@ function render_block_core_post_comments_count( $attributes ) {
  * Registers the `core/post-comments-count` block on the server.
  */
 function register_block_core_post_comments_count() {
+	$path     = __DIR__ . '/post-comments-count/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-comments-count',
-		array(
-			'attributes'      => array(
-				'className' => array(
-					'type' => 'string',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'attributes'      => array(
+					'className' => array(
+						'type' => 'string',
+					),
 				),
-			),
-			'render_callback' => 'render_block_core_post_comments_count',
+				'render_callback' => 'render_block_core_post_comments_count',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-comments-form/index.php b/packages/block-library/src/post-comments-form/index.php
index 43bace1145ebbc..cb1aff17fc5af1 100644
--- a/packages/block-library/src/post-comments-form/index.php
+++ b/packages/block-library/src/post-comments-form/index.php
@@ -26,10 +26,16 @@ function render_block_core_post_comments_form() {
  * Registers the `core/post-comments-form` block on the server.
  */
 function register_block_core_post_comments_form() {
+	$path     = __DIR__ . '/post-comments-form/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-comments-form',
-		array(
-			'render_callback' => 'render_block_core_post_comments_form',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_comments_form',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-content/index.php b/packages/block-library/src/post-content/index.php
index 5765d383f76061..1e6870fd0b3134 100644
--- a/packages/block-library/src/post-content/index.php
+++ b/packages/block-library/src/post-content/index.php
@@ -26,10 +26,16 @@ function render_block_core_post_content() {
  * Registers the `core/post-content` block on the server.
  */
 function register_block_core_post_content() {
+	$path     = __DIR__ . '/post-content/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-content',
-		array(
-			'render_callback' => 'render_block_core_post_content',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_content',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-date/index.php b/packages/block-library/src/post-date/index.php
index 56052e0d00a0e6..22e4c53e311eaf 100644
--- a/packages/block-library/src/post-date/index.php
+++ b/packages/block-library/src/post-date/index.php
@@ -27,15 +27,16 @@ function render_block_core_post_date( $attributes ) {
  * Registers the `core/post-date` block on the server.
  */
 function register_block_core_post_date() {
+	$path     = __DIR__ . '/post-date/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-date',
-		array(
-			'attributes'      => array(
-				'format' => array(
-					'type' => 'string',
-				),
-			),
-			'render_callback' => 'render_block_core_post_date',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_date',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-excerpt/index.php b/packages/block-library/src/post-excerpt/index.php
index c3f1755d0422f0..5d2ee7755beee4 100644
--- a/packages/block-library/src/post-excerpt/index.php
+++ b/packages/block-library/src/post-excerpt/index.php
@@ -47,23 +47,16 @@ function render_block_core_post_excerpt( $attributes ) {
  * Registers the `core/post-excerpt` block on the server.
  */
 function register_block_core_post_excerpt() {
+	$path     = __DIR__ . '/post-excerpt/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-excerpt',
-		array(
-			'attributes'      => array(
-				'wordCount'         => array(
-					'type'    => 'number',
-					'default' => 55,
-				),
-				'moreText'          => array(
-					'type' => 'string',
-				),
-				'showMoreOnNewLine' => array(
-					'type'    => 'boolean',
-					'default' => true,
-				),
-			),
-			'render_callback' => 'render_block_core_post_excerpt',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_excerpt',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-featured-image/index.php b/packages/block-library/src/post-featured-image/index.php
index cf14f66e90b34d..4a03b2e4d30284 100644
--- a/packages/block-library/src/post-featured-image/index.php
+++ b/packages/block-library/src/post-featured-image/index.php
@@ -22,10 +22,16 @@ function render_block_core_post_featured_image() {
  * Registers the `core/post-featured-image` block on the server.
  */
 function register_block_core_post_featured_image() {
+	$path     = __DIR__ . '/post-featured-image/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-featured-image',
-		array(
-			'render_callback' => 'render_block_core_post_featured_image',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_featured_image',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-tags/index.php b/packages/block-library/src/post-tags/index.php
index 84a969dac7518e..4fff8d0014c840 100644
--- a/packages/block-library/src/post-tags/index.php
+++ b/packages/block-library/src/post-tags/index.php
@@ -29,10 +29,16 @@ function render_block_core_post_tags() {
  * Registers the `core/post-tags` block on the server.
  */
 function register_block_core_post_tags() {
+	$path     = __DIR__ . '/post-tags/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-tags',
-		array(
-			'render_callback' => 'render_block_core_post_tags',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_tags',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/post-title/index.php b/packages/block-library/src/post-title/index.php
index 8b6b372e8faa72..c635ad2a0f0eb9 100644
--- a/packages/block-library/src/post-title/index.php
+++ b/packages/block-library/src/post-title/index.php
@@ -22,10 +22,16 @@ function render_block_core_post_title() {
  * Registers the `core/post-title` block on the server.
  */
 function register_block_core_post_title() {
+	$path     = __DIR__ . '/post-title/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/post-title',
-		array(
-			'render_callback' => 'render_block_core_post_title',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_post_title',
+			)
 		)
 	);
 }
diff --git a/packages/block-library/src/site-title/index.php b/packages/block-library/src/site-title/index.php
index eddf094f0300f8..a63760983436e2 100644
--- a/packages/block-library/src/site-title/index.php
+++ b/packages/block-library/src/site-title/index.php
@@ -24,10 +24,16 @@ function render_block_core_site_title( $attributes ) {
  * Registers the `core/site-title` block on the server.
  */
 function register_block_core_site_title() {
+	$path     = __DIR__ . '/site-title/block.json';
+	$metadata = json_decode( file_get_contents( $path ), true );
+
 	register_block_type(
-		'core/site-title',
-		array(
-			'render_callback' => 'render_block_core_site_title',
+		$metadata['name'],
+		array_merge(
+			$metadata,
+			array(
+				'render_callback' => 'render_block_core_site_title',
+			)
 		)
 	);
 }