diff --git a/intelligence_radar/clock_attribution.py b/intelligence_radar/clock_attribution.py
new file mode 100644
index 0000000..c10081d
--- /dev/null
+++ b/intelligence_radar/clock_attribution.py
@@ -0,0 +1,12 @@
+"""Optional recording-time evidence; original local timestamps remain intact."""
+import os
+
+def recording_time():
+    if not os.environ.get('INTELLIGENCE_RADAR_CLOCK_TRUST_FILE'):
+        return {}
+    try:
+        from railiance_clock.attribution import from_environment
+        result = from_environment('INTELLIGENCE_RADAR_CLOCK_TRUST_FILE')
+        return result
+    except (ImportError, OSError, ValueError):
+        return {'railiance_time': {'status': 'unavailable', 'kind': 'recording_time'}}
diff --git a/intelligence_radar/ingest.py b/intelligence_radar/ingest.py
index d03cda4..6144d88 100644
--- a/intelligence_radar/ingest.py
+++ b/intelligence_radar/ingest.py
@@ -7,6 +7,8 @@ import time
 from urllib.parse import urlparse
 from urllib.request import Request, urlopen
 
+from .clock_attribution import recording_time
+
 from .store import all_records, atomic, put
 
 MAX_BYTES = 5 * 1024 * 1024
@@ -53,6 +55,7 @@ def capture(root, source, opener=urlopen, now=None):
                'content_sha256': content_hash, 'media_type': media_type,
                'bytes': len(body), 'changed': changed, 'attempts': attempts,
                'status': 'captured_unreviewed'}
+    receipt.update(recording_time())
     ident = put(root, 'captures', receipt)
     if changed:
         from .__main__ import record
@@ -80,6 +83,7 @@ def ingest(root, registry):
             results.append({'source_id': source['id'], 'ok': False, 'error': str(exc)})
     run = {'observed_at': datetime.now(timezone.utc).isoformat(), 'sources': results,
            'ok': all(r['ok'] for r in results)}
+    run.update(recording_time())
     put(root, 'ingestion-runs', run)
     return run
 
diff --git a/intelligence_radar/trials.py b/intelligence_radar/trials.py
index 912664f..f2bf4e5 100644
--- a/intelligence_radar/trials.py
+++ b/intelligence_radar/trials.py
@@ -9,6 +9,7 @@ from pathlib import Path
 import time
 from urllib.request import Request, urlopen
 
+from .clock_attribution import recording_time
 from .store import all_records, canonical, get, put
 
 ENDPOINT = 'https://openrouter.ai/api/v1/chat/completions'
@@ -158,6 +159,7 @@ def execute(root, config, case, model, opener=urlopen):
                'runtime_seconds':time.monotonic()-start,'completed_at':datetime.now(timezone.utc).isoformat(),
                'reservation_id':reservation,'synthetic':False,
                'sample_kind':'controlled repository work sample; real provider execution'}
+        trial.update(recording_time())
         ident=put(root,'trials',trial)
         put(root,'trial-events',{'kind':'settled','campaign':campaign,'run_id':run_id,
                                  'reservation_id':reservation,'trial_id':ident,'actual_usd':str(cost)})