diff --git a/src/k1link/simulation/gaussian_pipeline_gateway.py b/src/k1link/simulation/gaussian_pipeline_gateway.py
index d0737e0..c5c24c6 100644
--- a/src/k1link/simulation/gaussian_pipeline_gateway.py
+++ b/src/k1link/simulation/gaussian_pipeline_gateway.py
@@ -22,6 +22,8 @@ RESULT_SCHEMA: Final = "gaussian-pipeline.build-result/v1"
 CAPABILITIES_SCHEMA: Final = "gaussian-pipeline.capabilities/v1"
 SAFE_UPLOAD_ID: Final = re.compile(r"^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$")
 SHA256_PATTERN: Final = re.compile(r"^[a-f0-9]{64}$")
+SOURCE_REVISION_PATTERN: Final = re.compile(r"^[a-f0-9]{40}$")
+IMAGE_DIGEST_PATTERN: Final = re.compile(r"^sha256:[a-f0-9]{64}$")
 DEFAULT_CHUNK_BYTES: Final = 8 * 1024 * 1024
 MAX_JSON_RESPONSE_BYTES: Final = 32 * 1024 * 1024
 MAX_RETRIES: Final = 3
@@ -103,8 +105,10 @@ class GaussianPipelineGateway:
         if (
             document.get("schema_version") != CAPABILITIES_SCHEMA
             or document.get("service") != "ndc-gaussian-pipeline"
+            or document.get("api_version") != "gaussian-pipeline.api/v1"
         ):
             raise GaussianPipelineGatewayError("Gaussian provider capabilities do not match v1")
+        _validate_runtime_provenance(document)
         return document
 
     def upload_source(
@@ -185,6 +189,7 @@ class GaussianPipelineGateway:
         result = self._json("GET", f"/v1/jobs/{quote(job_id, safe='')}/result")
         if result.get("schema_version") != RESULT_SCHEMA or result.get("job_id") != job_id:
             raise GaussianPipelineGatewayError("Gaussian result identity does not match")
+        _validate_runtime_provenance(result)
         return result
 
     def download_artifact(
@@ -408,6 +413,21 @@ def _safe_id(value: str, label: str) -> None:
         raise GaussianPipelineGatewayError(f"Gaussian {label} is invalid")
 
 
+def _validate_runtime_provenance(document: Mapping[str, object]) -> None:
+    runtime = document.get("runtime")
+    if not isinstance(runtime, dict):
+        raise GaussianPipelineGatewayError("Gaussian runtime provenance is unavailable")
+    source_revision = runtime.get("source_revision")
+    image_digest = runtime.get("image_digest")
+    if (
+        not isinstance(source_revision, str)
+        or SOURCE_REVISION_PATTERN.fullmatch(source_revision) is None
+        or not isinstance(image_digest, str)
+        or IMAGE_DIGEST_PATTERN.fullmatch(image_digest) is None
+    ):
+        raise GaussianPipelineGatewayError("Gaussian runtime provenance is invalid")
+
+
 def _unavailable(message: str, error: httpx.HTTPError) -> GaussianPipelineGatewayError:
     if isinstance(error, httpx.TransportError):
         return GaussianPipelineUnavailableError(message)
diff --git a/tests/test_gaussian_pipeline_gateway.py b/tests/test_gaussian_pipeline_gateway.py
index b5a84d6..4c8b596 100644
--- a/tests/test_gaussian_pipeline_gateway.py
+++ b/tests/test_gaussian_pipeline_gateway.py
@@ -34,7 +34,12 @@ def test_gateway_uploads_with_tus_and_reads_provider_contract(tmp_path: Path) ->
                 json={
                     "schema_version": "gaussian-pipeline.capabilities/v1",
                     "service": "ndc-gaussian-pipeline",
+                    "api_version": "gaussian-pipeline.api/v1",
                     "provider": {"id": "playcanvas-splat-transform", "version": "3.3.3"},
+                    "runtime": {
+                        "source_revision": "a" * 40,
+                        "image_digest": f"sha256:{'b' * 64}",
+                    },
                 },
             )
         if request.method == "POST" and request.url.path == "/v1/uploads":
@@ -177,7 +182,14 @@ def test_gateway_submits_tracks_and_imports_digest_bound_artifact(tmp_path: Path
         if request.method == "GET" and request.url.path == f"/v1/jobs/{job_id}/result":
             return httpx.Response(
                 200,
-                json={"schema_version": "gaussian-pipeline.build-result/v1", "job_id": job_id},
+                json={
+                    "schema_version": "gaussian-pipeline.build-result/v1",
+                    "job_id": job_id,
+                    "runtime": {
+                        "source_revision": "a" * 40,
+                        "image_digest": f"sha256:{'b' * 64}",
+                    },
+                },
             )
         if request.method == "GET" and request.url.path.endswith("/artifacts/preview.sog"):
             return httpx.Response(200, content=artifact)
@@ -201,3 +213,25 @@ def test_gateway_submits_tracks_and_imports_digest_bound_artifact(tmp_path: Path
             tmp_path / "import" / "preview.sog",
         )
     assert destination.read_bytes() == artifact
+
+
+def test_gateway_rejects_capabilities_without_runtime_provenance(tmp_path: Path) -> None:
+    def handler(_request: httpx.Request) -> httpx.Response:
+        return httpx.Response(
+            200,
+            json={
+                "schema_version": "gaussian-pipeline.capabilities/v1",
+                "service": "ndc-gaussian-pipeline",
+                "api_version": "gaussian-pipeline.api/v1",
+            },
+        )
+
+    with (
+        GaussianPipelineGateway(
+            "http://gaussian.test",
+            _token_file(tmp_path),
+            transport=httpx.MockTransport(handler),
+        ) as gateway,
+        pytest.raises(GaussianPipelineGatewayError, match="provenance is unavailable"),
+    ):
+        gateway.capabilities()
diff --git a/tests/test_simulation_world_provider_api.py b/tests/test_simulation_world_provider_api.py
index caf235e..53ad6c6 100644
--- a/tests/test_simulation_world_provider_api.py
+++ b/tests/test_simulation_world_provider_api.py
@@ -22,7 +22,12 @@ def _gateway(tmp_path: Path, status: int = 200) -> GaussianPipelineGateway:
             json={
                 "schema_version": "gaussian-pipeline.capabilities/v1",
                 "service": "ndc-gaussian-pipeline",
+                "api_version": "gaussian-pipeline.api/v1",
                 "provider": {"id": "playcanvas-splat-transform", "version": "3.3.3"},
+                "runtime": {
+                    "source_revision": "a" * 40,
+                    "image_digest": f"sha256:{'b' * 64}",
+                },
             },
         )