diff --git a/Cargo.lock b/Cargo.lock
index e9a97c3..b23de17 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -630,6 +630,9 @@ dependencies = [
 [[package]]
 name = "hemx-xtask"
 version = "0.1.0"
+dependencies = [
+ "hemx-js",
+]
 
 [[package]]
 name = "html5ever"
diff --git a/docs/recipes/mobile-release.md b/docs/recipes/mobile-release.md
index 5d1cec4..956f884 100644
--- a/docs/recipes/mobile-release.md
+++ b/docs/recipes/mobile-release.md
@@ -56,7 +56,8 @@ The generated manifest records:
 - app identity and version;
 - the production HTTPS origin used by Android and iOS shells;
 - `target/release/hemx-workout-example` as the server artifact;
-- runtime assets served by the same release through `hemx_axum::runtime_js_path()`;
+- the exact runtime asset path and SHA-256 digest served by the same release;
+- `asset-integrity.tsv` as a plain-text integrity receipt for mobile shell review;
 - cache policy: release-scoped HTML/CSS/runtime assets only;
 - offline truth policy: app-owned command/event/projection records, never DOM
   patches or UI effect payloads;
diff --git a/hemx-xtask/Cargo.toml b/hemx-xtask/Cargo.toml
index b6b3abd..fceab27 100644
--- a/hemx-xtask/Cargo.toml
+++ b/hemx-xtask/Cargo.toml
@@ -7,3 +7,6 @@ publish = false
 [[bin]]
 name = "hemx-ci"
 path = "src/main.rs"
+
+[dependencies]
+hemx-js = { path = "../hemx-js" }
diff --git a/hemx-xtask/src/main.rs b/hemx-xtask/src/main.rs
index 3afc71c..c51a84e 100644
--- a/hemx-xtask/src/main.rs
+++ b/hemx-xtask/src/main.rs
@@ -373,6 +373,10 @@ fn write_workout_mobile_release(
         config.out_dir.join("release-manifest.json"),
         workout_mobile_manifest(config, blockers),
     )?;
+    fs::write(
+        config.out_dir.join("asset-integrity.tsv"),
+        workout_asset_integrity(),
+    )?;
     fs::write(
         config.out_dir.join("BLOCKERS.md"),
         workout_mobile_blockers_md(blockers),
@@ -409,7 +413,14 @@ fn verify_workout_mobile_release(
     let android_path = config.out_dir.join("android/twa-release.json");
     let ios_path = config.out_dir.join("ios/webview-release.json");
     let blockers_path = config.out_dir.join("BLOCKERS.md");
-    for path in [&manifest_path, &android_path, &ios_path, &blockers_path] {
+    let integrity_path = config.out_dir.join("asset-integrity.tsv");
+    for path in [
+        &manifest_path,
+        &android_path,
+        &ios_path,
+        &blockers_path,
+        &integrity_path,
+    ] {
         if !path.exists() {
             failures.push(format!("{} is missing", path.display()));
         }
@@ -421,7 +432,9 @@ fn verify_workout_mobile_release(
             &config.app_id,
             &config.version,
             &config.origin,
-            "hemx_axum::runtime_js_path()",
+            hemx_js::RUNTIME_JS_PATH,
+            hemx_js::RUNTIME_JS_HASH,
+            "asset-integrity.tsv",
             "app-owned command/event/projection records",
             "secrets and signing credentials stay outside the repo",
             "rollback",
@@ -466,6 +479,12 @@ fn verify_workout_mobile_release(
         &mut failures,
     );
 
+    check_file_contains(
+        &integrity_path,
+        &[hemx_js::RUNTIME_JS_PATH, hemx_js::RUNTIME_JS_HASH, "sha256"],
+        &mut failures,
+    );
+
     for blocker in mobile_external_blockers(config) {
         check_file_contains(&manifest_path, &[&blocker], &mut failures);
         check_file_contains(&blockers_path, &[&blocker], &mut failures);
@@ -496,13 +515,23 @@ fn check_file_contains(path: &Path, needles: &[&str], failures: &mut Vec<String>
     }
 }
 
+fn workout_asset_integrity() -> String {
+    format!(
+        "path\talgorithm\tdigest\n{}\tsha256\t{}\n",
+        hemx_js::RUNTIME_JS_PATH,
+        hemx_js::RUNTIME_JS_HASH
+    )
+}
+
 fn workout_mobile_manifest(config: &WorkoutMobileConfig, blockers: &[String]) -> String {
     format!(
-        "{{\n  \"app_id\": \"{}\",\n  \"name\": \"{}\",\n  \"version\": \"{}\",\n  \"origin\": \"{}\",\n  \"server_binary\": \"target/release/hemx-workout-example\",\n  \"runtime_asset_path\": \"served by hemx_axum::runtime_js_path() from the same release\",\n  \"cache_policy\": \"cache only release-scoped HTML/CSS/runtime assets; never store DOM patches or UI effects as truth\",\n  \"state_policy\": \"app-owned command/event/projection records\",\n  \"host_result_kinds\": [\"denied\", \"timeout\", \"unavailable\", \"error\"],\n  \"environment_boundary\": \"public mobile shell config lives here; secrets and signing credentials stay outside the repo\",\n  \"rollback\": \"redeploy the previous server binary and matching mobile shell metadata; rebuild store artifacts with the previous version/signing inputs\",\n  \"android\": \"android/twa-release.json\",\n  \"ios\": \"ios/webview-release.json\",\n  \"external_blockers\": [{}]\n}}\n",
+        "{{\n  \"app_id\": \"{}\",\n  \"name\": \"{}\",\n  \"version\": \"{}\",\n  \"origin\": \"{}\",\n  \"server_binary\": \"target/release/hemx-workout-example\",\n  \"runtime_asset_path\": \"{}\",\n  \"runtime_asset_sha256\": \"{}\",\n  \"asset_integrity\": \"asset-integrity.tsv\",\n  \"cache_policy\": \"cache only release-scoped HTML/CSS/runtime assets; never store DOM patches or UI effects as truth\",\n  \"state_policy\": \"app-owned command/event/projection records\",\n  \"host_result_kinds\": [\"denied\", \"timeout\", \"unavailable\", \"error\"],\n  \"environment_boundary\": \"public mobile shell config lives here; secrets and signing credentials stay outside the repo\",\n  \"rollback\": \"redeploy the previous server binary and matching mobile shell metadata; rebuild store artifacts with the previous version/signing inputs\",\n  \"android\": \"android/twa-release.json\",\n  \"ios\": \"ios/webview-release.json\",\n  \"external_blockers\": [{}]\n}}\n",
         json_escape(&config.app_id),
         json_escape(&config.app_name),
         json_escape(&config.version),
         json_escape(&config.origin),
+        json_escape(hemx_js::RUNTIME_JS_PATH),
+        json_escape(hemx_js::RUNTIME_JS_HASH),
         json_string_list(blockers),
     )
 }
@@ -936,7 +965,9 @@ mod tests {
         let manifest = workout_mobile_manifest(&config, &blockers);
 
         assert!(manifest.contains("target/release/hemx-workout-example"));
-        assert!(manifest.contains("hemx_axum::runtime_js_path()"));
+        assert!(manifest.contains(hemx_js::RUNTIME_JS_PATH));
+        assert!(manifest.contains(hemx_js::RUNTIME_JS_HASH));
+        assert!(manifest.contains("asset-integrity.tsv"));
         assert!(manifest.contains("app-owned command/event/projection records"));
         assert!(manifest.contains(
             "\"host_result_kinds\": [\"denied\", \"timeout\", \"unavailable\", \"error\"]"