diff --git a/server/src/modules/computers/application/service.test.ts b/server/src/modules/computers/application/service.test.ts
index 9d8a55d4fa8..356766d035c 100644
--- a/server/src/modules/computers/application/service.test.ts
+++ b/server/src/modules/computers/application/service.test.ts
@@ -582,3 +582,29 @@ with open(output,'wb') as out,open(error,'wb') as err:
     expect(f.backend.retire).toHaveBeenCalledOnce();
   });
 });
+
+
+describe("computer retirement proof", () => {
+  it("proves only the exact retired run without provider actions", async () => {
+    const f = fixture();
+    await f.attach();
+    const binding = await f.admit();
+    const input = { ...f.scope, owner: binding.owner, agentId: "agent", runId: "run" };
+    expect(await f.service.isRetired(input)).toBe(false);
+    expect(f.backend.retire).not.toHaveBeenCalled();
+    await f.service.retire(input);
+    vi.mocked(f.backend.retire).mockClear();
+    vi.mocked(f.backend.inspect).mockClear();
+    expect(await f.service.isRetired(input)).toBe(true);
+    for (const change of [
+      { agentId: "other-agent" },
+      { runId: "other-run" },
+      { owner: { ...binding.owner, computerId: "other-computer" } },
+      { owner: { ...binding.owner, ownerId: "other-owner" } },
+      { owner: { ...binding.owner, generation: binding.owner.generation + 1 } },
+    ]) expect(await f.service.isRetired({ ...input, ...change })).toBe(false);
+    await expect(f.service.isRetired({ ...input, companyId: "other-company" })).rejects.toMatchObject({ code: "not_found" });
+    expect(f.backend.retire).not.toHaveBeenCalled();
+    expect(f.backend.inspect).not.toHaveBeenCalled();
+  });
+});
diff --git a/server/src/modules/computers/application/service.ts b/server/src/modules/computers/application/service.ts
index 0fdf0203557..39945961d4f 100644
--- a/server/src/modules/computers/application/service.ts
+++ b/server/src/modules/computers/application/service.ts
@@ -484,6 +484,18 @@ finally:
       ).toISOString();
     });
   }
+  async function isRetired(input: Scope & { owner: OwnerRef; agentId: string; runId: string }) {
+    const record = await repository.get(input);
+    if (record.id !== input.owner.computerId) return false;
+    return record.ledger.owners.some((owner) =>
+      owner.id === input.owner.ownerId &&
+      owner.generation === input.owner.generation &&
+      owner.kind === "runner" &&
+      owner.phase === "retired" &&
+      owner.agentId === input.agentId &&
+      owner.runId === input.runId,
+    );
+  }
   async function retire(input: Scope & { owner: OwnerRef }) {
     const state = await repository.update(input, (record) => {
       const owner = record.ledger.owners.find(
@@ -956,6 +968,7 @@ finally:
     },
     recover,
     retainWarm,
+    isRetired,
     retire,
     connect,
     renewViewer,