diff --git a/tools/seal-orchestration.mjs b/tools/seal-orchestration.mjs
index 691fe92..41bd3ad 100644
--- a/tools/seal-orchestration.mjs
+++ b/tools/seal-orchestration.mjs
@@ -43,3 +43,22 @@ export function sealPlan({ md, currentArtifact, verdict, key, judgeMode, nowMs,
   const seal = freezeImpl({ steps: planObj.steps, skills: planObj.skills, artifactId: currentArtifact.artifact_id, judgeMode, key, nowMs });
   return { sealed: true, seal };
 }
+
+// ── owner-seal (SP3 / Фикс 3) ──
+// Владелец на арбитраже опечатывает артефакт/план как есть, перевешивая NO-GO судьи И
+// наставника. Каноническая строка действия = `owner-seal:<hash>` — её подписывает escape-грант
+// владельца (router-mentor-receipts); контроллер подделать не может (protected runtime).
+
+/** Каноническая метка owner-seal для escape-гранта. hash = judged_hash артефакта/плана. */
+export function ownerSealAction(hash) {
+  return `owner-seal:${String(hash == null ? '' : hash)}`;
+}
+
+/** Решение печати с учётом owner-seal. Реальный GO (wired && GO) → печать обычным путём.
+ *  Иначе ownerSealOpen (владелец подписал owner-seal на этот hash) → печать несмотря на
+ *  NO-GO/degraded. Ни того, ни другого → нет печати. */
+export function decideSeal({ verdict, ownerSealOpen = false } = {}) {
+  if (isRealGo(verdict)) return { seal: true, via: 'wired-go' };
+  if (ownerSealOpen) return { seal: true, via: 'owner-seal' };
+  return { seal: false, via: null };
+}
diff --git a/tools/seal-orchestration.test.mjs b/tools/seal-orchestration.test.mjs
index bb55550..1585260 100644
--- a/tools/seal-orchestration.test.mjs
+++ b/tools/seal-orchestration.test.mjs
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { sealableArtifact, sealablePlan, judgedHashOf, sealArtifact, sealPlan } from './seal-orchestration.mjs';
+import { sealableArtifact, sealablePlan, judgedHashOf, sealArtifact, sealPlan, ownerSealAction, decideSeal } from './seal-orchestration.mjs';
 import { contentHash } from './judge-seal-channel.mjs';
 
 const specMd = '## Реш {#dec-a}\nтекст';
@@ -41,3 +41,24 @@ describe('seal-orchestration', () => {
     expect(r.sealed).toBe(false);
   });
 });
+
+describe('owner-seal (SP3)', () => {
+  it('ownerSealAction → каноническая метка owner-seal:<hash>', () => {
+    expect(ownerSealAction('abc123')).toBe('owner-seal:abc123');
+  });
+  it('ownerSealAction нулевой hash → owner-seal:', () => {
+    expect(ownerSealAction(null)).toBe('owner-seal:');
+  });
+  it('decideSeal: реальный GO → печать via wired-go', () => {
+    expect(decideSeal({ verdict: { wired: true, decision: 'GO' } })).toEqual({ seal: true, via: 'wired-go' });
+  });
+  it('decideSeal: NO-GO + ownerSealOpen → печать via owner-seal (перевешивает)', () => {
+    expect(decideSeal({ verdict: { wired: true, decision: 'NO-GO' }, ownerSealOpen: true })).toEqual({ seal: true, via: 'owner-seal' });
+  });
+  it('decideSeal: NO-GO без owner-seal → нет печати', () => {
+    expect(decideSeal({ verdict: { wired: true, decision: 'NO-GO' }, ownerSealOpen: false })).toEqual({ seal: false, via: null });
+  });
+  it('decideSeal: degraded (wired:false) + ownerSealOpen → печать via owner-seal', () => {
+    expect(decideSeal({ verdict: { wired: false, decision: 'GO' }, ownerSealOpen: true })).toEqual({ seal: true, via: 'owner-seal' });
+  });
+});