diff --git a/tools/upend_js/constants.ts b/tools/upend_js/constants.ts
new file mode 100644
index 0000000..0368e92
--- /dev/null
+++ b/tools/upend_js/constants.ts
@@ -0,0 +1,2 @@
+export const BLOB_TYPE_ADDR =
+  "zDtsJnvdeiqxAX34t971seEjXcPbGHqeeWBWMZTzs6wpmgs9L";
diff --git a/ui/src/components/Address.svelte b/ui/src/components/Address.svelte
index 652d30b..e4112b5 100644
--- a/ui/src/components/Address.svelte
+++ b/ui/src/components/Address.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
   import { createEventDispatcher } from "svelte";
+  import { BLOB_TYPE_ADDR } from "upend/constants";
   import { identify, useEntity } from "../lib/entity";
   import HashBadge from "./HashBadge.svelte";
   import Marquee from "./Marquee.svelte";
@@ -8,14 +9,19 @@
 
   export let address: string;
   export let link = false;
-  export let isFile = false;
   export let resolve = true;
 
   let resolving = resolve;
 
+  const { attributes, backlinks } = useEntity(address, () => resolve);
+
+  // isFile
+  $: isFile = $attributes.some(
+    ([_, attr]) => attr.attribute === "IS" && attr.value.c === BLOB_TYPE_ADDR
+  );
+
   // Identification
   let inferredIds: string[] = [];
-  const { attributes, backlinks } = useEntity(address, () => resolve);
   $: {
     if (resolve) {
       resolving = true;
diff --git a/ui/src/components/Inspect.svelte b/ui/src/components/Inspect.svelte
index 51a502d..12b9b8e 100644
--- a/ui/src/components/Inspect.svelte
+++ b/ui/src/components/Inspect.svelte
@@ -82,10 +82,7 @@
 
 <div class="inspect">
   <h2>
-    <Address
-      {address}
-      isFile={Object.values(allTypes).some((t) => t.name === "BLOB")}
-    />
+    <Address {address} />
   </h2>
   <BlobPreview {address} />
   {#if !$error}