diff --git a/server/routes/takeoverCredits.js b/server/routes/takeoverCredits.js
index 04c1022..84dfa61 100644
--- a/server/routes/takeoverCredits.js
+++ b/server/routes/takeoverCredits.js
@@ -2,6 +2,7 @@ import { Router } from 'express'
 import { config } from '../config.js'
 import { getSessionCustomerId, requireSession } from '../middleware/session.js'
 import { getDocument, listDocuments, Query } from '../services/appwriteAdmin.js'
+import { signFileLink } from '../services/signedLinks.js'
 import {
   answerQuestion,
   applyTakeoverCredit,
@@ -176,9 +177,21 @@ takeoverAdminRouter.get('/open-count', async (_req, res) => {
   }
 })
 
+// Nachweise bekommen einen signierten Link (15 min) auf den Team-Eingang: das Ticketsystem oeffnet sie ohne
+// Authorization-Header (routes/team/files.js). Bei jedem Oeffnen des Antrags neu signiert.
+function withSignedFileUrls(detail, now = Date.now()) {
+  const id = detail.request.id
+  const base = `${config.publicBaseUrl}/api/team/takeover-credits/${encodeURIComponent(id)}/files`
+  const files = detail.request.files.map((file) => {
+    const { exp, sig } = signFileLink({ kind: 'takeover', customerId: id, id: file.id, now })
+    return { ...file, url: `${base}/${encodeURIComponent(file.id)}?exp=${exp}&sig=${sig}` }
+  })
+  return { ...detail, request: { ...detail.request, files } }
+}
+
 takeoverAdminRouter.get('/:id', async (req, res) => {
   try {
-    return res.json(await getAdminDetail(req.params.id))
+    return res.json(withSignedFileUrls(await getAdminDetail(req.params.id)))
   } catch (err) {
     return sendError(res, err, 'Antrag konnte nicht geladen werden')
   }
diff --git a/server/routes/team/files.js b/server/routes/team/files.js
index ac1cfcf..fb35f35 100644
--- a/server/routes/team/files.js
+++ b/server/routes/team/files.js
@@ -1,9 +1,10 @@
 import { Router } from 'express'
 import { openAttachment, sendAttachment } from '../../services/chatAttachments.js'
 import { verifyFileLink } from '../../services/signedLinks.js'
+import { getTakeoverRequest, readUpload } from '../../services/takeoverCredits.js'
 
 /**
- * Anhaenge mit signiertem Link (?exp=&sig=, 15 min) ohne JWT ausliefern: <img>, <audio> und Downloads im
+ * Chat-Anhaenge und Gutschrift-Nachweise mit signiertem Link (?exp=&sig=, 15 min) ohne JWT ausliefern: <img>, <audio> und Downloads im
  * Ticketsystem koennen keinen Authorization-Header tragen. Ohne sig geht es weiter zur JWT-Pruefung.
  * Eingehaengt in routes/team/index.js VOR requireStaffJwt.
  */
@@ -23,4 +24,23 @@ router.get('/chats/:customerId/attachments/:id', async (req, res, next) => {
   }
 })
 
+// Nachweise einer Uebernahmegutschrift (wie takeoverAdminRouter GET /:id/files/:fileId), signiert ueber die Antrags-ID
+router.get('/takeover-credits/:id/files/:fileId', async (req, res, next) => {
+  if (req.query.sig === undefined) return next()
+  const { id, fileId } = req.params
+  if (!verifyFileLink({ kind: 'takeover', customerId: id, id: fileId, exp: req.query.exp, sig: String(req.query.sig) })) {
+    return res.status(403).json({ error: 'Link abgelaufen. Bitte den Antrag neu öffnen.' })
+  }
+  try {
+    const { file, content } = await readUpload(await getTakeoverRequest(id), fileId)
+    res.setHeader('Content-Type', file.type)
+    res.setHeader('Content-Disposition', `inline; filename*=UTF-8''${encodeURIComponent(file.name)}`)
+    res.setHeader('X-Content-Type-Options', 'nosniff')
+    res.setHeader('Cache-Control', 'private, no-store')
+    return res.send(content)
+  } catch (err) {
+    return res.status(err.status || 500).send(err.message || 'Datei nicht verfügbar')
+  }
+})
+
 export default router
diff --git a/test/teamAdminRoutes.test.js b/test/teamAdminRoutes.test.js
index cbd1a64..15cf1a2 100644
--- a/test/teamAdminRoutes.test.js
+++ b/test/teamAdminRoutes.test.js
@@ -100,3 +100,34 @@ test('ohne JWT 401 fuer alle neuen Pfade', async () => {
     assert.equal((await rawGet(p)).status, 401, p)
   }
 })
+
+// Task 2: Nachweise per signiertem Link (15 min) – Links im Ticketsystem tragen keinen Authorization-Header
+const FILE_ID = '0b9c2f0e-6d6e-4c1a-9a51-6a3a9d1b2c3d'
+aw.seed('takeoverCredits', {
+  // eigener Kunde und entschieden, damit Filter und openCount der anderen Tests gleich bleiben
+  $id: 'tc9', customerId: 'c4', email: 'k@example.invalid', services: JSON.stringify(['hosting']), provider: 'IONOS', domain: 'kunde.de',
+  invoiceAmountCents: 12000, billingMonths: 12, paidUntil: '2026-12-31T00:00:00.000Z', message: 'x', status: 'abgelehnt', history: '[]',
+  takeoverFrom: '2026-10-01T00:00:00.000Z',
+  files: JSON.stringify([{ id: FILE_ID, name: 'rechnung.pdf', type: 'application/pdf', ext: 'pdf', size: 9, uploadedAt: '2026-10-01T08:00:00.000Z' }]),
+})
+mkdirSync(path.join(process.env.TAKEOVER_UPLOAD_DIR, 'tc9'), { recursive: true })
+writeFileSync(path.join(process.env.TAKEOVER_UPLOAD_DIR, 'tc9', `${FILE_ID}.pdf`), '%PDF-1.4\n')
+
+test('Nachweis: signierter Link ohne JWT 200 mit Inhalt, fremder Antrag/abgelaufen 403, ohne sig 401', async (t) => {
+  const detail = (await rawGet('/api/team/takeover-credits/tc9', staff)).body
+  const url = detail.request.files[0].url
+  assert.match(url, new RegExp(`^https://project\\.webklar\\.com/api/team/takeover-credits/tc9/files/${FILE_ID}\\?exp=\\d+&sig=[0-9a-f]{64}$`))
+  const u = new URL(url)
+  const rel = u.pathname + u.search
+  const ok = await fetch(app.url + rel)
+  assert.equal(ok.status, 200)
+  assert.equal(ok.headers.get('content-type'), 'application/pdf')
+  assert.equal(await ok.text(), '%PDF-1.4\n')
+  assert.equal((await rawGet(rel.replace('/tc9/', '/tc1/'))).status, 403)
+  assert.equal((await rawGet(u.pathname)).status, 401)
+  const now = Date.now()
+  t.mock.method(Date, 'now', () => now + 16 * 60 * 1000)
+  const expired = await rawGet(rel)
+  assert.equal(expired.status, 403)
+  assert.equal(expired.body.error, 'Link abgelaufen. Bitte den Antrag neu öffnen.')
+})