diff --git a/infra/register-record-check.py b/infra/register-record-check.py
new file mode 100644
index 0000000..e8e16fd
--- /dev/null
+++ b/infra/register-record-check.py
@@ -0,0 +1,88 @@
+#!/usr/bin/env python3
+"""S-19a (#149): prove the approval path wrote the register record to Objecten.
+
+Given the registration whose Beoordelen task the caller just completed with `goedkeuren`, assert
+that Objecten holds exactly one RegisterRecord object for it, with status INGESCHREVEN and the
+registration's reference — i.e. the ACL's Objecten hop ran, the record validates against the
+objecttype schema (Objecten rejects a mismatch), and it carries no personal data (ADR-0027/0028).
+
+Stdlib only so it runs in a bare python:3-slim container on the compose network.
+"""
+import json
+import os
+import sys
+import time
+import urllib.error
+import urllib.parse
+import urllib.request
+
+OBJECTTYPEN = os.environ["OBJECTTYPEN"]           # http://<ip>:8000
+OBJECTTYPEN_TOKEN = os.environ["OBJECTTYPEN_TOKEN"]
+OBJECTEN = os.environ["OBJECTEN"]                 # http://<ip>:8000
+OBJECTEN_TOKEN = os.environ["OBJECTEN_TOKEN"]
+REFERENCE = os.environ["REGISTRATION_REFERENCE"]
+TIMEOUT = int(os.environ.get("REGISTER_RECORD_TIMEOUT", "60"))
+NAME = "RegisterRecord"
+# The register is world-readable: a record must never carry anything identifying (ADR-0027).
+ALLOWED_FIELDS = {"id", "status", "reference"}
+
+
+def get(base, token, path, crs=False):
+    headers = {"Authorization": f"Token {token}"}
+    if crs:
+        headers["Accept-Crs"] = "EPSG:4326"
+    req = urllib.request.Request(f"{base}{path}", headers=headers)
+    with urllib.request.urlopen(req, timeout=10) as r:
+        return json.load(r)
+
+
+def objecttype_url():
+    """The RegisterRecord objecttype URL, or None while registerrecord-init has yet to run."""
+    ots = get(OBJECTTYPEN, OBJECTTYPEN_TOKEN, "/api/v2/objecttypes").get("results", [])
+    match = next((o for o in ots if o.get("name") == NAME), None)
+    return match["url"] if match else None
+
+
+def check():
+    """Return (ok, detail). Raises on transport errors so the caller can retry."""
+    type_url = objecttype_url()
+    if not type_url:
+        return False, f"no objecttype named {NAME!r} in Objecttypen yet"
+
+    query = urllib.parse.urlencode({"type": type_url, "data_attrs": f"reference__exact__{REFERENCE}"})
+    results = get(OBJECTEN, OBJECTEN_TOKEN, f"/api/v2/objects?{query}", crs=True).get("results", [])
+    if not results:
+        return False, f"no RegisterRecord object with reference {REFERENCE}"
+    if len(results) > 1:
+        # The ACL upserts, so a replayed approval must update rather than duplicate (§8.6).
+        return False, f"{len(results)} RegisterRecord objects for reference {REFERENCE} — the write is not idempotent"
+
+    data = (results[0].get("record") or {}).get("data") or {}
+    if data.get("status") != "INGESCHREVEN":
+        return False, f"record status is {data.get('status')!r}, expected 'INGESCHREVEN'"
+    if not data.get("id"):
+        return False, "record carries no id (the zaak the projection keys on)"
+    extra = set(data) - ALLOWED_FIELDS
+    if extra:
+        return False, f"record leaks non-public fields: {sorted(extra)}"
+    return True, f"id={data['id']} status={data['status']} reference={data['reference']}"
+
+
+def main():
+    deadline = time.time() + TIMEOUT
+    detail = "no attempt"
+    while time.time() < deadline:
+        try:
+            ok, detail = check()
+            if ok:
+                print(f"OK — approval wrote the register record to Objecten: {detail}")
+                return 0
+        except (urllib.error.URLError, ConnectionError, TimeoutError) as e:
+            detail = f"transport: {e}"
+        time.sleep(3)
+    print(f"FAIL — {detail}", file=sys.stderr)
+    return 1
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/infra/run-domain-check.sh b/infra/run-domain-check.sh
index 833032a..9f12b75 100755
--- a/infra/run-domain-check.sh
+++ b/infra/run-domain-check.sh
@@ -142,6 +142,31 @@ still="$(printf '%s' "$resp" | task_for_reg "$reg_id")"
 [ -z "$still" ] || { echo "FAIL — Beoordelen task $still still active after completion" >&2; exit 1; }
 echo "OK — behandelaar claimed and completed the Beoordelen task; the registratie process finished"
 
+# ── S-19a: the same approval also wrote the canonical register record to Objecten (ADR-0028).
+# Assert it for THIS registration (matched on its reference) rather than "some INGESCHREVEN record":
+# the shared verify stack carries records from earlier runs. The container-name filters are anchored
+# on the compose replica suffix so they don't also match objecten-db / objecttypen-db.
+echo ">> asserting the approval wrote the register record to Objecten (S-19a)"
+obj="$(docker ps -q --filter 'name=objecten[-_][0-9]+$' | head -1)"
+objt="$(docker ps -q --filter 'name=objecttypen[-_][0-9]+$' | head -1)"
+[ -n "$obj" ] || { echo "FAIL — no running objecten container" >&2; exit 1; }
+[ -n "$objt" ] || { echo "FAIL — no running objecttypen container" >&2; exit 1; }
+rr="$(docker create --network "$net" \
+  -e "OBJECTEN=http://$(ip "$obj"):8000" \
+  -e "OBJECTEN_TOKEN=${OBJECTEN_TOKEN:-1234567890abcdef1234567890abcdef12345678}" \
+  -e "OBJECTTYPEN=http://$(ip "$objt"):8000" \
+  -e "OBJECTTYPEN_TOKEN=${OBJECTTYPEN_TOKEN:-0123456789abcdef0123456789abcdef01234567}" \
+  -e "REGISTRATION_REFERENCE=$reg_id" \
+  python:3-slim python /register-record-check.py)"
+docker cp "$here/register-record-check.py" "$rr:/register-record-check.py" >/dev/null
+rr_rc=0; docker start -a "$rr" || rr_rc=$?
+docker rm -f "$rr" >/dev/null
+if [ "$rr_rc" -ne 0 ]; then
+  acl="$(docker ps -q --filter 'name=[-_]acl[-_]' | head -1)"
+  [ -n "$acl" ] && { echo "--- acl log ---" >&2; docker logs "$acl" 2>&1 | tail -20 >&2; }
+  exit "$rr_rc"
+fi
+
 # ── S-11: withdrawal. A second registration parks at Beoordelen; the citizen withdraws it via the
 # domain, which delivers the RegistratieIngetrokken message to the task's execution, tripping the
 # BPMN boundary event so the process ends and the Beoordelen task disappears (ADR-0014). ────────────