diff --git a/src/applications/calendar/storage/PhabricatorCalendarEvent.php b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
--- a/src/applications/calendar/storage/PhabricatorCalendarEvent.php
+++ b/src/applications/calendar/storage/PhabricatorCalendarEvent.php
@@ -1182,9 +1182,8 @@
    * @task markup
    */
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    $id = $this->getID();
-    return "calendar:T{$id}:{$field}:{$hash}";
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
 
diff --git a/src/applications/differential/storage/DifferentialInlineComment.php b/src/applications/differential/storage/DifferentialInlineComment.php
--- a/src/applications/differential/storage/DifferentialInlineComment.php
+++ b/src/applications/differential/storage/DifferentialInlineComment.php
@@ -260,8 +260,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    // We can't use ID because synthetic comments don't have it.
-    return 'DI:'.PhabricatorHash::digest($this->getContent());
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function newMarkupEngine($field) {
diff --git a/src/applications/legalpad/storage/LegalpadDocumentBody.php b/src/applications/legalpad/storage/LegalpadDocumentBody.php
--- a/src/applications/legalpad/storage/LegalpadDocumentBody.php
+++ b/src/applications/legalpad/storage/LegalpadDocumentBody.php
@@ -39,8 +39,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    return 'LEGB:'.$hash;
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function newMarkupEngine($field) {
diff --git a/src/applications/maniphest/storage/ManiphestTask.php b/src/applications/maniphest/storage/ManiphestTask.php
--- a/src/applications/maniphest/storage/ManiphestTask.php
+++ b/src/applications/maniphest/storage/ManiphestTask.php
@@ -301,9 +301,8 @@
    * @task markup
    */
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    $id = $this->getID();
-    return "maniphest:T{$id}:{$field}:{$hash}";
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
 
diff --git a/src/applications/phame/storage/PhameBlog.php b/src/applications/phame/storage/PhameBlog.php
--- a/src/applications/phame/storage/PhameBlog.php
+++ b/src/applications/phame/storage/PhameBlog.php
@@ -289,8 +289,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    return $this->getPHID().':'.$field.':'.$hash;
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
 
diff --git a/src/applications/phame/storage/PhamePost.php b/src/applications/phame/storage/PhamePost.php
--- a/src/applications/phame/storage/PhamePost.php
+++ b/src/applications/phame/storage/PhamePost.php
@@ -241,8 +241,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    return $this->getPHID().':'.$field.':'.$hash;
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function newMarkupEngine($field) {
diff --git a/src/applications/pholio/storage/PholioImage.php b/src/applications/pholio/storage/PholioImage.php
--- a/src/applications/pholio/storage/PholioImage.php
+++ b/src/applications/pholio/storage/PholioImage.php
@@ -84,8 +84,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    return 'M:'.$hash;
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function newMarkupEngine($field) {
diff --git a/src/applications/pholio/storage/PholioMock.php b/src/applications/pholio/storage/PholioMock.php
--- a/src/applications/pholio/storage/PholioMock.php
+++ b/src/applications/pholio/storage/PholioMock.php
@@ -217,8 +217,8 @@
 
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    return 'M:'.$hash;
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function newMarkupEngine($field) {
diff --git a/src/applications/phriction/storage/PhrictionContent.php b/src/applications/phriction/storage/PhrictionContent.php
--- a/src/applications/phriction/storage/PhrictionContent.php
+++ b/src/applications/phriction/storage/PhrictionContent.php
@@ -68,12 +68,8 @@
    * @task markup
    */
   public function getMarkupFieldKey($field) {
-    if ($this->shouldUseMarkupCache($field)) {
-      $id = $this->getID();
-    } else {
-      $id = PhabricatorHash::digest($this->getMarkupText($field));
-    }
-    return "phriction:{$field}:{$id}";
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
 
diff --git a/src/applications/ponder/storage/PonderAnswer.php b/src/applications/ponder/storage/PonderAnswer.php
--- a/src/applications/ponder/storage/PonderAnswer.php
+++ b/src/applications/ponder/storage/PonderAnswer.php
@@ -136,9 +136,8 @@
   // Markup interface
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    $id = $this->getID();
-    return "ponder:A{$id}:{$field}:{$hash}";
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function getMarkupText($field) {
diff --git a/src/applications/ponder/storage/PonderQuestion.php b/src/applications/ponder/storage/PonderQuestion.php
--- a/src/applications/ponder/storage/PonderQuestion.php
+++ b/src/applications/ponder/storage/PonderQuestion.php
@@ -155,9 +155,8 @@
   // Markup interface
 
   public function getMarkupFieldKey($field) {
-    $hash = PhabricatorHash::digest($this->getMarkupText($field));
-    $id = $this->getID();
-    return "ponder:Q{$id}:{$field}:{$hash}";
+    $content = $this->getMarkupText($field);
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   public function getMarkupText($field) {
diff --git a/src/applications/releeph/field/specification/ReleephFieldSpecification.php b/src/applications/releeph/field/specification/ReleephFieldSpecification.php
--- a/src/applications/releeph/field/specification/ReleephFieldSpecification.php
+++ b/src/applications/releeph/field/specification/ReleephFieldSpecification.php
@@ -236,12 +236,14 @@
   }
 
   final public function getMarkupFieldKey($field) {
-    return sprintf(
+    $content = sprintf(
       '%s:%s:%s:%s',
       $this->getReleephRequest()->getPHID(),
       $this->getStorageKey(),
       $field,
-      PhabricatorHash::digest($this->getMarkupText($field)));
+      $this->getMarkupText($field));
+
+    return PhabricatorMarkupEngine::digestRemarkupContent($this, $content);
   }
 
   final public function newMarkupEngine($field) {
diff --git a/src/infrastructure/markup/PhabricatorMarkupEngine.php b/src/infrastructure/markup/PhabricatorMarkupEngine.php
--- a/src/infrastructure/markup/PhabricatorMarkupEngine.php
+++ b/src/infrastructure/markup/PhabricatorMarkupEngine.php
@@ -694,4 +694,19 @@
       ->execute();
   }
 
+  public static function digestRemarkupContent($object, $content) {
+    $parts = array();
+    $parts[] = get_class($object);
+
+    if ($object instanceof PhabricatorLiskDAO) {
+      $parts[] = $object->getID();
+    }
+
+    $parts[] = $content;
+
+    $message = implode("\n", $parts);
+
+    return PhabricatorHash::digestWithNamedKey($message, 'remarkup');
+  }
+
 }