diff --git a/README.md b/README.md
index 9e99c98..94c4d55 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,16 @@ This application serves as the "Native Mode" runtime for Aether podiums and devi
 
 ## ⚙️ Configuration
 
-The application requires a `seed_config.json` file to identify the device and connect to the Aether API.
+The application requires a `seed.json` file to identify the device and connect to the Aether API.
 
 ### 1. Seed Configuration
-Create/edit `resources/seed_config.json`:
+
+**Location: `~/seed.json`** (user's home directory — external to the app bundle by design)
+
+This file is intentionally kept outside the application bundle so it can be edited per-device
+without re-signing or repackaging the app. On macOS this is `/Users/<username>/seed.json`.
+
+Create/edit `~/seed.json`:
 ```json
 {
   "event_device_id": "YOUR_DEVICE_ID",
@@ -25,13 +31,30 @@ Create/edit `resources/seed_config.json`:
 }
 ```
 
-### 2. Environment Setup
+> **Note:** The `event_device_id` and `aether_api_key` values come from the Aether admin panel
+> (Events → Devices). Each physical device gets its own record and key.
+
+### 2. Development Setup
 ```bash
 npm install
-npm run build
-npm start
+npm start        # Compiles TypeScript (tsc) then launches Electron
 ```
 
+### 3. File Cache Layout
+
+Presentation files are cached locally under `hash_prefix_length`-char subdirectories (default: 2):
+```text
+[local_file_cache_path]/
+  4a/
+    4a228ef8ac1a...sha256hash...file
+  1d/
+    1d720916a831...sha256hash...file
+```
+
+**Important:** `hash_prefix_length` must be consistent. If it changes, files in old directories
+become orphaned and will be re-downloaded. The default is `2` and should not be changed unless
+explicitly coordinated across all devices.
+
 ## 🌉 The Native Bridge (`aetherNative`)
 
 The bridge is exposed to the renderer via `contextBridge`. It can be accessed in the web UI via `window.aetherNative`.
diff --git a/dist/main/file_handlers.js b/dist/main/file_handlers.js
index 7714452..08017fe 100644
--- a/dist/main/file_handlers.js
+++ b/dist/main/file_handlers.js
@@ -41,6 +41,7 @@ const electron_1 = require("electron");
 const fs = __importStar(require("fs"));
 const path = __importStar(require("path"));
 const os = __importStar(require("os"));
+const crypto = __importStar(require("crypto"));
 const child_process_1 = require("child_process");
 const axios_1 = __importDefault(require("axios"));
 const file_utils_1 = require("./file_utils");
@@ -55,18 +56,44 @@ function registerFileHandlers() {
             fs.mkdirSync(dir, { recursive: true });
         return path.join(dir, `${hash}.file`);
     }
-    electron_1.ipcMain.handle('native:check-cache', async (event, { cache_root, hash, hash_prefix_length = 2 }) => {
+    electron_1.ipcMain.handle('native:check-cache', async (event, { cache_root, hash, hash_prefix_length = 2, verify_hash = false }) => {
         const full_path = get_organized_hashed_path(cache_root, hash, hash_prefix_length);
-        return fs.existsSync(full_path);
+        if (!fs.existsSync(full_path))
+            return false;
+        if (verify_hash) {
+            try {
+                const file_buffer = fs.readFileSync(full_path);
+                const actual_hash = crypto.createHash('sha256').update(file_buffer).digest('hex');
+                return actual_hash === hash;
+            }
+            catch (e) {
+                return false;
+            }
+        }
+        return true;
     });
     electron_1.ipcMain.handle('native:download-to-cache', async (event, { url, cache_root, hash, api_key, account_id, hash_prefix_length = 2 }) => {
         const full_path = get_organized_hashed_path(cache_root, hash, hash_prefix_length);
         const tmp_path = `${full_path}.tmp`;
         if (endpoints_in_progress.includes(url))
             return { success: true, status: 'in_progress' };
+        // 1. If final file exists, skip
         if (fs.existsSync(full_path))
             return { success: true, path: full_path, status: 'exists' };
-        console.log(`Native: Organized Download (${hash_prefix_length} chars) -> ${full_path}`);
+        // 2. Handle stale .tmp files (Legacy "Trust No One" pattern)
+        if (fs.existsSync(tmp_path)) {
+            const stats = fs.statSync(tmp_path);
+            const age_ms = Date.now() - stats.mtimeMs;
+            // If the tmp file is older than 5 minutes, assume previous download crashed and delete it
+            if (age_ms > 5 * 60 * 1000) {
+                console.log(`Native: Deleting stale temp file (${Math.round(age_ms / 1000)}s old)`);
+                fs.unlinkSync(tmp_path);
+            }
+            else {
+                return { success: true, status: 'in_progress', detail: 'fresh_tmp_exists' };
+            }
+        }
+        console.log(`Native: Hardened Download -> ${full_path}`);
         try {
             endpoints_in_progress.push(url);
             const response = await (0, axios_1.default)({
@@ -83,7 +110,16 @@ function registerFileHandlers() {
                 writer.on('finish', () => resolve());
                 writer.on('error', reject);
             });
+            // 3. Verify Integrity before renaming (The "Trust No One" Check)
+            const file_buffer = fs.readFileSync(tmp_path);
+            const actual_hash = crypto.createHash('sha256').update(file_buffer).digest('hex');
+            if (actual_hash !== hash) {
+                console.error(`Native: Hash Mismatch! Expected ${hash}, got ${actual_hash}`);
+                fs.unlinkSync(tmp_path);
+                return { success: false, error: 'Integrity check failed: Hash mismatch' };
+            }
             fs.renameSync(tmp_path, full_path);
+            console.log(`Native: Cache Integrity Verified. File moved to final destination.`);
             return { success: true, path: full_path };
         }
         catch (error) {
@@ -146,7 +182,8 @@ function registerFileHandlers() {
                     if (script) {
                         console.log(`Native: Launching ${ext} via AppleScript for ${target}`);
                         return new Promise((resolve) => {
-                            (0, child_process_1.exec)(`osascript -e "${script.replace(/"/g, '\\\\"')}"`, (err) => {
+                            const escapedScript = script.trim().replace(/"/g, '\\\\\\"').replace(/\\n/g, ' -e "') + '"';
+                            (0, child_process_1.exec)(`osascript -e ${escapedScript}`, (err) => {
                                 if (err)
                                     resolve({ success: false, error: err.message });
                                 else
diff --git a/dist/main/file_handlers.js.map b/dist/main/file_handlers.js.map
index 097a1bc..f6f3f83 100644
--- a/dist/main/file_handlers.js.map
+++ b/dist/main/file_handlers.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/main/file_handlers.ts b/src/main/file_handlers.ts
index acb73c5..f272570 100644
--- a/src/main/file_handlers.ts
+++ b/src/main/file_handlers.ts
@@ -16,7 +16,7 @@ export function registerFileHandlers() {
     const prefix = hash.substring(0, Math.max(1, Math.min(prefix_len, 8)));
     const dir = path.join(expanded_root, prefix);
     if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
-    return path.join(dir, \`\${hash}.file\`);
+    return path.join(dir, `${hash}.file`);
   }
 
   ipcMain.handle('native:check-cache', async (event, { cache_root, hash, hash_prefix_length = 2, verify_hash = false }) => {
@@ -39,7 +39,7 @@ export function registerFileHandlers() {
 
   ipcMain.handle('native:download-to-cache', async (event, { url, cache_root, hash, api_key, account_id, hash_prefix_length = 2 }) => {
     const full_path = get_organized_hashed_path(cache_root, hash, hash_prefix_length);
-    const tmp_path = \`\${full_path}.tmp\`;
+    const tmp_path = `${full_path}.tmp`;
 
     if (endpoints_in_progress.includes(url)) return { success: true, status: 'in_progress' };
     
@@ -52,14 +52,14 @@ export function registerFileHandlers() {
       const age_ms = Date.now() - stats.mtimeMs;
       // If the tmp file is older than 5 minutes, assume previous download crashed and delete it
       if (age_ms > 5 * 60 * 1000) {
-        console.log(\`Native: Deleting stale temp file (\${Math.round(age_ms/1000)}s old)\`);
+        console.log(`Native: Deleting stale temp file (${Math.round(age_ms/1000)}s old)`);
         fs.unlinkSync(tmp_path);
       } else {
         return { success: true, status: 'in_progress', detail: 'fresh_tmp_exists' };
       }
     }
 
-    console.log(\`Native: Hardened Download -> \${full_path}\`);
+    console.log(`Native: Hardened Download -> ${full_path}`);
 
     try {
       endpoints_in_progress.push(url);
@@ -85,13 +85,13 @@ export function registerFileHandlers() {
       const actual_hash = crypto.createHash('sha256').update(file_buffer).digest('hex');
 
       if (actual_hash !== hash) {
-        console.error(\`Native: Hash Mismatch! Expected \${hash}, got \${actual_hash}\`);
+        console.error(`Native: Hash Mismatch! Expected ${hash}, got ${actual_hash}`);
         fs.unlinkSync(tmp_path);
         return { success: false, error: 'Integrity check failed: Hash mismatch' };
       }
 
       fs.renameSync(tmp_path, full_path);
-      console.log(\`Native: Cache Integrity Verified. File moved to final destination.\`);
+      console.log(`Native: Cache Integrity Verified. File moved to final destination.`);
       return { success: true, path: full_path };
     } catch (error: any) {
       if (fs.existsSync(tmp_path)) fs.unlinkSync(tmp_path);
@@ -107,7 +107,7 @@ export function registerFileHandlers() {
       const expanded_temp = expandPath(temp_root);
       const target = path.join(expanded_temp, filename);
       
-      console.log(\`Native: Launching from Cache -> \${filename}\`);
+      console.log(`Native: Launching from Cache -> ${filename}`);
 
       if (!fs.existsSync(expanded_temp)) fs.mkdirSync(expanded_temp, { recursive: true });
       
@@ -121,9 +121,9 @@ export function registerFileHandlers() {
       // 3. Optimized Launch (LibreOffice / AppleScript)
       if (is_pres) {
         if (os.platform() === 'linux') {
-          console.log(\`Native: Launching LibreOffice (--impress) for \${target}\`);
+          console.log(`Native: Launching LibreOffice (--impress) for ${target}`);
           return new Promise((resolve) => {
-            exec(\`libreoffice --impress "\${target}"\`, (err) => {
+            exec(`libreoffice --impress "${target}"`, (err) => {
               if (err) resolve({ success: false, error: err.message });
               else resolve({ success: true });
             });
@@ -133,30 +133,30 @@ export function registerFileHandlers() {
         if (os.platform() === 'darwin') {
           let script = '';
           if (ext === 'key') {
-            script = \`
+            script = `
               tell application "Keynote"
                 activate
-                open (POSIX file "\${target}")
+                open (POSIX file "${target}")
                 delay 1
                 start (front document)
               end tell
-            \`;
+            `;
           } else if (ext === 'pptx' || ext === 'ppt') {
-            script = \`
+            script = `
               tell application "Microsoft PowerPoint"
                 activate
-                open (POSIX file "\${target}")
+                open (POSIX file "${target}")
                 delay 1
                 run slide show of active presentation
               end tell
-            \`;
+            `;
           }
 
           if (script) {
-            console.log(\`Native: Launching \${ext} via AppleScript for \${target}\`);
+            console.log(`Native: Launching ${ext} via AppleScript for ${target}`);
             return new Promise((resolve) => {
               const escapedScript = script.trim().replace(/"/g, '\\\\\\"').replace(/\\n/g, ' -e "') + '"';
-              exec(\`osascript -e \${escapedScript}\`, (err) => {
+              exec(`osascript -e ${escapedScript}`, (err) => {
                 if (err) resolve({ success: false, error: err.message });
                 else resolve({ success: true });
               });