diff --git a/gittensor/validator/issue_discovery/mirror_scan.py b/gittensor/validator/issue_discovery/mirror_scan.py
index 8fdb7eb80..04fd6c8c7 100644
--- a/gittensor/validator/issue_discovery/mirror_scan.py
+++ b/gittensor/validator/issue_discovery/mirror_scan.py
@@ -13,6 +13,7 @@
 - solved_by_pr must be populated
 - solving_pr.state == 'MERGED'
 - not solving_pr.edited_after_merge
+- issue.last_edited_at <= solving_pr.merged_at (anti-spec-rewrite)
 - issue.state_reason == 'COMPLETED' (not NOT_PLANNED, not null)
 - not issue.is_transferred
 - issue.author_github_id != solving_pr.author_github_id (anti-self-issue)
@@ -465,6 +466,13 @@ def _classify_issue(issue: MirrorIssue) -> str:
         )
         return 'not-solved-closed'
 
+    if issue.last_edited_at is not None and sp.merged_at is not None and issue.last_edited_at > sp.merged_at:
+        bt.logging.debug(
+            f'  issue #{issue.issue_number} ({issue.repo_full_name}): closed-not-solved '
+            f'(issue body/title edited after solving PR #{sp.pr_number} merge — anti-spec-rewrite gate)'
+        )
+        return 'not-solved-closed'
+
     if not issue.author_github_id:
         bt.logging.debug(f'  issue #{issue.issue_number} ({issue.repo_full_name}): ignore (missing author_github_id)')
         return 'ignore'
diff --git a/tests/validator/issue_discovery/test_mirror_scan.py b/tests/validator/issue_discovery/test_mirror_scan.py
index feba79d94..5d4cee08f 100644
--- a/tests/validator/issue_discovery/test_mirror_scan.py
+++ b/tests/validator/issue_discovery/test_mirror_scan.py
@@ -109,6 +109,7 @@ def _issue_dict(
     solving_pr_state: str = 'MERGED',
     solving_pr_author: str = '218712309',
     solving_pr_edited_after_merge: bool = False,
+    last_edited_at: Optional[str] = None,
     repo: str = 'entrius/gittensor-ui',
 ) -> dict:
     sp = None
@@ -138,7 +139,7 @@ def _issue_dict(
         'created_at': '2026-04-01T00:00:00Z',
         'closed_at': '2026-04-18T10:00:00Z' if state == 'CLOSED' else None,
         'updated_at': '2026-04-18T10:00:00Z',
-        'last_edited_at': None,
+        'last_edited_at': last_edited_at,
         'is_transferred': is_transferred,
         'solved_by_pr': solved_by_pr,
         'labels': [],
@@ -207,6 +208,23 @@ def test_solving_pr_edited_after_merge_counts_as_closed(self):
         issue = MirrorIssue.from_dict(_issue_dict(solving_pr_edited_after_merge=True))
         assert _classify_issue(issue) == 'not-solved-closed'
 
+    def test_issue_edited_after_solving_pr_merge_counts_as_closed(self):
+        # Anti-spec-rewrite: miner can't author a vague issue, then rewrite the
+        # body after a third party's PR merges to retroactively claim discovery
+        # credit for a fix they didn't anticipate.
+        issue = MirrorIssue.from_dict(_issue_dict(last_edited_at='2026-04-18T10:00:01Z'))
+        assert _classify_issue(issue) == 'not-solved-closed'
+
+    def test_issue_edited_before_solving_pr_merge_is_solved(self):
+        # Pre-merge edits are legitimate (sharpening the spec while the PR is
+        # being written) and must NOT trip the gate.
+        issue = MirrorIssue.from_dict(_issue_dict(last_edited_at='2026-04-17T10:00:00Z'))
+        assert _classify_issue(issue) == 'solved'
+
+    def test_issue_never_edited_is_solved(self):
+        issue = MirrorIssue.from_dict(_issue_dict(last_edited_at=None))
+        assert _classify_issue(issue) == 'solved'
+
     def test_missing_author_ignored(self):
         issue = MirrorIssue.from_dict(_issue_dict(author_github_id=None))
         assert _classify_issue(issue) == 'ignore'