diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index d5fda62..566d985 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -34,6 +34,11 @@
       "branch": "refs/heads/main",
       "revision": "4477c5bf270211b26d30444274b2f3c696240d4f",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
+    },
+    "dart": {
+      "branch": "refs/heads/main",
+      "revision": "83fff2d9c8b5053e848b75a82bf97dfcd590a3dc",
+      "url": "https://dart.googlesource.com/recipes.git"
     }
   },
   "no_docs": true,
diff --git a/recipe_modules/flutter_bcid/__init__.py b/recipe_modules/flutter_bcid/__init__.py
index c790b26..033f58b 100644
--- a/recipe_modules/flutter_bcid/__init__.py
+++ b/recipe_modules/flutter_bcid/__init__.py
@@ -3,9 +3,12 @@
 # found in the LICENSE file.
 
 DEPS = [
+    'dart/dart',
+    'depot_tools/gsutil',
     'flutter/repo_util',
     'recipe_engine/bcid_reporter',
     'recipe_engine/buildbucket',
     'recipe_engine/file',
+    'recipe_engine/path',
     'recipe_engine/platform',
 ]
diff --git a/recipe_modules/flutter_bcid/api.py b/recipe_modules/flutter_bcid/api.py
index 3ab2a52..3c74b37 100644
--- a/recipe_modules/flutter_bcid/api.py
+++ b/recipe_modules/flutter_bcid/api.py
@@ -18,6 +18,9 @@
   TEST = 'test'
 
 
+VSA_EXTENSION = ".vsa.intoto.jsonl"
+
+
 class FlutterBcidApi(recipe_api.RecipeApi):
 
   def is_official_build(self):
@@ -47,3 +50,37 @@
     if self.is_official_build():
       sha256 = self.m.file.file_hash(local_artifact_path)
       self.m.bcid_reporter.report_gcs(sha256, remote_artifact_path)
+
+  def download_and_verify_provenance(
+      self, filename, bucket, gcs_path_without_bucket
+  ):
+    """Downloads and verifies provenance for a specified artifact.
+
+    This method downloads an artifact and associated provenance from GCS,
+    verifies it. If verification fails, an error is raised.
+
+    parameters:
+      filename: (str) the name of the file, eg: "flutter_artifact.zip"
+      bucket: (str) the GCS bucket, eg: "flutter_infra_release"
+      gcs_path_without_bucket: (str) the GCS path, excluding gs://{bucket}/
+        eg: "flutter/004d0bdf6721bc65cdb9a558908b2de4cfac97c5/sky_engine.zip"
+    """
+    verify_temp_path = self.m.path.mkdtemp("verify")
+    download_path = download_path = verify_temp_path.join(filename)
+    bcid_response = self.m.dart.download_and_verify(
+        filename, bucket, gcs_path_without_bucket, download_path,
+        'misc_software://flutter/engine'
+    )
+
+    artifact_vsa = bcid_response['verificationSummary']
+    vsa_local_path = f'{download_path}{VSA_EXTENSION}'
+    self.m.file.write_text(
+        f'write {filename}{VSA_EXTENSION}', vsa_local_path, artifact_vsa
+    )
+    vsa_path_without_bucket = gcs_path_without_bucket + VSA_EXTENSION
+    self.m.gsutil.upload(
+        vsa_local_path,
+        bucket,
+        gcs_path_without_bucket,
+        name=f'upload "{vsa_path_without_bucket}"'
+    )
diff --git a/recipe_modules/flutter_bcid/examples/full.expected/basic.json b/recipe_modules/flutter_bcid/examples/full.expected/basic.json
index 53ea223..de2c23c 100644
--- a/recipe_modules/flutter_bcid/examples/full.expected/basic.json
+++ b/recipe_modules/flutter_bcid/examples/full.expected/basic.json
@@ -112,6 +112,336 @@
     "name": "snoop: report_gcs"
   },
   {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra/release_artifacts/artifacts.zip",
+      "[CLEANUP]/verify_tmp_1/artifact.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil download artifact.zip"
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra/release_artifacts/artifacts.zip.intoto.jsonl",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.intoto.jsonl"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil download artifact.zip provenance"
+  },
+  {
+    "cmd": [
+      "luci-auth",
+      "token",
+      "-scopes",
+      "https://www.googleapis.com/auth/bcid_verify https://www.googleapis.com/auth/cloud-platform",
+      "-lifetime",
+      "3m"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "get access token for default account"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "file_hash",
+      "[CLEANUP]/verify_tmp_1/artifact.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Compute file hash (2)",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@Hash calculated: 3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.intoto.jsonl",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "read artifact.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_LOG_END@artifact.zip.intoto.jsonl@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "Authorization: Bearer extra.secret.token.should.not.be.logged\n",
+      "[CLEANUP]/authorization"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write authorization"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90\"}, \"attestations\": [\"\"]}}",
+      "[CLEANUP]/request"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write request",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@request@{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90\"}, \"attestations\": [\"\"]}}@@@",
+      "@@@STEP_LOG_END@request@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "curl",
+      "-H",
+      "@[CLEANUP]/authorization",
+      "-H",
+      "Content-Type: application/json",
+      "-d",
+      "@[CLEANUP]/request",
+      "https://bcidsoftwareverifier-pa.googleapis.com/v1/software-artifact-verification-requests"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "verify artifact.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@raw_io.output_text@{\"allowed\": true, \"verificationSummary\": \"This artifact is definitely legitimate!\"}@@@",
+      "@@@STEP_LOG_END@raw_io.output_text@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/authorization"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "delete authorization"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/request"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "delete request"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "This artifact is definitely legitimate!",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.vsa.intoto.jsonl"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write artifact.zip.vsa.intoto.jsonl",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@artifact.zip.vsa.intoto.jsonl@This artifact is definitely legitimate!@@@",
+      "@@@STEP_LOG_END@artifact.zip.vsa.intoto.jsonl@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.vsa.intoto.jsonl",
+      "gs://flutter_infra/release_artifacts/artifacts.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil upload \"release_artifacts/artifacts.zip.vsa.intoto.jsonl\"",
+    "~followup_annotations": [
+      "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/flutter_infra/release_artifacts/artifacts.zip@@@"
+    ]
+  },
+  {
     "name": "$result"
   }
 ]
\ No newline at end of file
diff --git a/recipe_modules/flutter_bcid/examples/full.expected/prod_build.json b/recipe_modules/flutter_bcid/examples/full.expected/prod_build.json
index 53ea223..de2c23c 100644
--- a/recipe_modules/flutter_bcid/examples/full.expected/prod_build.json
+++ b/recipe_modules/flutter_bcid/examples/full.expected/prod_build.json
@@ -112,6 +112,336 @@
     "name": "snoop: report_gcs"
   },
   {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra/release_artifacts/artifacts.zip",
+      "[CLEANUP]/verify_tmp_1/artifact.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil download artifact.zip"
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra/release_artifacts/artifacts.zip.intoto.jsonl",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.intoto.jsonl"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil download artifact.zip provenance"
+  },
+  {
+    "cmd": [
+      "luci-auth",
+      "token",
+      "-scopes",
+      "https://www.googleapis.com/auth/bcid_verify https://www.googleapis.com/auth/cloud-platform",
+      "-lifetime",
+      "3m"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "get access token for default account"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "file_hash",
+      "[CLEANUP]/verify_tmp_1/artifact.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Compute file hash (2)",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@Hash calculated: 3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.intoto.jsonl",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "read artifact.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_LOG_END@artifact.zip.intoto.jsonl@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "Authorization: Bearer extra.secret.token.should.not.be.logged\n",
+      "[CLEANUP]/authorization"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write authorization"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90\"}, \"attestations\": [\"\"]}}",
+      "[CLEANUP]/request"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write request",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@request@{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"3038cc85aa9c41479c21791a47b1af8f38a422a73f61553b320b1411018a4c90\"}, \"attestations\": [\"\"]}}@@@",
+      "@@@STEP_LOG_END@request@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "curl",
+      "-H",
+      "@[CLEANUP]/authorization",
+      "-H",
+      "Content-Type: application/json",
+      "-d",
+      "@[CLEANUP]/request",
+      "https://bcidsoftwareverifier-pa.googleapis.com/v1/software-artifact-verification-requests"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "verify artifact.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@raw_io.output_text@{\"allowed\": true, \"verificationSummary\": \"This artifact is definitely legitimate!\"}@@@",
+      "@@@STEP_LOG_END@raw_io.output_text@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/authorization"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "delete authorization"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/request"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "delete request"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "This artifact is definitely legitimate!",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.vsa.intoto.jsonl"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "write artifact.zip.vsa.intoto.jsonl",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@artifact.zip.vsa.intoto.jsonl@This artifact is definitely legitimate!@@@",
+      "@@@STEP_LOG_END@artifact.zip.vsa.intoto.jsonl@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "[CLEANUP]/verify_tmp_1/artifact.zip.vsa.intoto.jsonl",
+      "gs://flutter_infra/release_artifacts/artifacts.zip"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "gsutil upload \"release_artifacts/artifacts.zip.vsa.intoto.jsonl\"",
+    "~followup_annotations": [
+      "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/flutter_infra/release_artifacts/artifacts.zip@@@"
+    ]
+  },
+  {
     "name": "$result"
   }
 ]
\ No newline at end of file
diff --git a/recipe_modules/flutter_bcid/examples/full.py b/recipe_modules/flutter_bcid/examples/full.py
index d423d09..428cfee 100644
--- a/recipe_modules/flutter_bcid/examples/full.py
+++ b/recipe_modules/flutter_bcid/examples/full.py
@@ -6,6 +6,7 @@
     'flutter/flutter_bcid',
     'recipe_engine/buildbucket',
     'recipe_engine/path',
+    'recipe_engine/raw_io',
 ]
 
 
@@ -16,9 +17,14 @@
   )
   api.flutter_bcid.is_official_build()
   api.flutter_bcid.is_prod_build()
+  api.flutter_bcid.download_and_verify_provenance(
+      "artifact.zip", "flutter_infra", "release_artifacts/artifacts.zip"
+  )
 
 
 def GenTests(api):
+  fake_bcid_response_success = '{"allowed": true, "verificationSummary": "This artifact is definitely legitimate!"}'
+  artifacts_location = 'artifact.zip'
   yield api.test(
       'basic',
       api.buildbucket.ci_build(
@@ -27,6 +33,10 @@
           git_repo='https://dart.googlesource.com/monorepo',
           git_ref='refs/heads/main'
       ),
+      api.step_data(
+          'verify %s provenance' % artifacts_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_success)
+      ),
   )
 
   yield api.test(
@@ -37,4 +47,8 @@
           git_repo='https://dart.googlesource.com/monorepo',
           git_ref='refs/heads/main'
       ),
+      api.step_data(
+          'verify %s provenance' % artifacts_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_success)
+      ),
   )
diff --git a/recipes/engine_v2/builder.expected/dart-internal-flutter.json b/recipes/engine_v2/builder.expected/dart-internal-flutter-failure.json
similarity index 78%
rename from recipes/engine_v2/builder.expected/dart-internal-flutter.json
rename to recipes/engine_v2/builder.expected/dart-internal-flutter-failure.json
index 46d8060..c75a9e2 100644
--- a/recipes/engine_v2/builder.expected/dart-internal-flutter.json
+++ b/recipes/engine_v2/builder.expected/dart-internal-flutter-failure.json
@@ -2278,6 +2278,725 @@
     "name": "snoop: report_stage (5)"
   },
   {
+    "cmd": [],
+    "name": "Verify provenance",
+    "~followup_annotations": [
+      "@@@STEP_FAILURE@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "listdir",
+      "[CACHE]/builder/src/out/android_jit_release_x86/zip_archives/download.flutter.io",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.Expand directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@listdir@[CACHE]/builder/src/out/android_jit_release_x86/zip_archives/download.flutter.io/io/flutter/x86_debug/1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584/x86_debug-1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584.jar@@@",
+      "@@@STEP_LOG_LINE@listdir@[CACHE]/builder/src/out/android_jit_release_x86/zip_archives/download.flutter.io/io/flutter/x86_debug/1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584/x86_debug-1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584.pom@@@",
+      "@@@STEP_LOG_END@listdir@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.git rev-parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra_release/flutter/12345abcde12345abcde12345abcde12345abcde/android-x86-jit-release/artifacts.zip",
+      "[CLEANUP]/verify_tmp_1/artifacts.zip"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.gsutil download artifacts.zip",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "----",
+      "cp",
+      "gs://flutter_infra_release/flutter/12345abcde12345abcde12345abcde12345abcde/android-x86-jit-release/artifacts.zip.intoto.jsonl",
+      "[CLEANUP]/verify_tmp_1/artifacts.zip.intoto.jsonl"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.gsutil download artifacts.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "luci-auth",
+      "token",
+      "-scopes",
+      "https://www.googleapis.com/auth/bcid_verify https://www.googleapis.com/auth/cloud-platform",
+      "-lifetime",
+      "3m"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.get access token for default account",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "file_hash",
+      "[CLEANUP]/verify_tmp_1/artifacts.zip"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.Compute file hash",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Hash calculated: 22e7401925ec25dd8c35fae6da25fdebcaa015f2b82f07f517814c9d7b7381f4@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CLEANUP]/verify_tmp_1/artifacts.zip.intoto.jsonl",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.read artifacts.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@artifacts.zip.intoto.jsonl@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "Authorization: Bearer extra.secret.token.should.not.be.logged\n",
+      "[CLEANUP]/authorization"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.write authorization",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"22e7401925ec25dd8c35fae6da25fdebcaa015f2b82f07f517814c9d7b7381f4\"}, \"attestations\": [\"\"]}}",
+      "[CLEANUP]/request"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.write request",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@request@{\"resourceToVerify\": \"misc_software://flutter/engine\", \"artifactInfo\": {\"digests\": {\"sha256\": \"22e7401925ec25dd8c35fae6da25fdebcaa015f2b82f07f517814c9d7b7381f4\"}, \"attestations\": [\"\"]}}@@@",
+      "@@@STEP_LOG_END@request@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "curl",
+      "-H",
+      "@[CLEANUP]/authorization",
+      "-H",
+      "Content-Type: application/json",
+      "-d",
+      "@[CLEANUP]/request",
+      "https://bcidsoftwareverifier-pa.googleapis.com/v1/software-artifact-verification-requests"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.verify artifacts.zip provenance",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@  {@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@    \"rejectionMessage\": \"failed to validate!\"@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@  }@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@  @@@",
+      "@@@STEP_LOG_END@raw_io.output_text@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Verify provenance.artifacts.zip provenance rejected: failed to validate!",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_FAILURE@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/authorization"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.delete authorization",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CLEANUP]/request"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.delete request",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "(Non-blocking) Provenance verification failed - check step above"
+  },
+  {
     "cmd": [
       "vpython3",
       "-u",
diff --git a/recipes/engine_v2/builder.expected/dart-internal-flutter-success.json b/recipes/engine_v2/builder.expected/dart-internal-flutter-success.json
new file mode 100644
index 0000000..47a7224
--- /dev/null
+++ b/recipes/engine_v2/builder.expected/dart-internal-flutter-success.json
@@ -0,0 +1,4836 @@
+[
+  {
+    "cmd": [
+      "top",
+      "-b",
+      "-n",
+      "3",
+      "-o",
+      "%MEM"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "OS info"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[START_DIR]/reporter",
+      "-ensure-file",
+      "infra/tools/security/provenance_broker/${platform} git_revision:d3cf3b0144447a77fd79c84fe8500dfe993ef602",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:d3c\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/security/provenance_broker/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/reporter/snoopy_broker",
+      "-report-stage",
+      "-stage",
+      "start",
+      "-recipe",
+      "engine_v2/builder",
+      "-pid",
+      "12345"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "snoop: report_stage"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Clobber build output"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [
+      "[START_DIR]/reporter/snoopy_broker",
+      "-report-stage",
+      "-stage",
+      "fetch"
+    ],
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "snoop: report_stage (2)"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "listdir",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Empty [CACHE]/builder",
+    "~followup_annotations": [
+      "@@@STEP_LOG_END@listdir@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'custom_vars': {'release_candidate': True}, 'deps_file': '.DEPS.git', 'managed': False, 'name': 'src/flutter', 'url': 'https://flutter.googlesource.com/mirrors/engine'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@2d72510e447ab60a9728aeea2362d8be2cbd7789",
+      "--refs",
+      "refs/heads/main"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "DEPOT_TOOLS_REPORT_BUILD": "dart-internal/flutter/builder/8945511751514863184",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BACKENDINFO": "1",
+      "GIT_BRANCH": "",
+      "GIT_DAPPER_TRACE": "1",
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "1800",
+      "GIT_SSH_COMMAND": "ssh -o SendEnv=GIT_DAPPER_TRACE -o SendEnv=GIT_BACKENDINFO",
+      "GIT_TRACE2_EVENT": "[CLEANUP]/trace2-event",
+      "GIT_TRACE_CURL": "[CLEANUP]/trace-curl",
+      "GIT_TRACE_CURL_NO_DATA": "1",
+      "GIT_TRACE_PACKET": "[CLEANUP]/trace-packet",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
+      "REVISION": "2d72510e447ab60a9728aeea2362d8be2cbd7789"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Checkout source code.bot_update",
+    "timeout": 900,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/main@{#84512}\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"2d72510e447ab60a9728aeea2362d8be2cbd7789\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/main@{#84512}\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"9221bca00ddbd888260084def81f09543281b952\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "ANDROID_SDK_HOME": "[CLEANUP]/tmp_tmp_1",
+      "ANDROID_USER_HOME": "[CLEANUP]/tmp_tmp_1/.android",
+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "DEPOT_TOOLS_REPORT_BUILD": "dart-internal/flutter/builder/8945511751514863184",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GIT_BRANCH": "",
+      "LUCI_BRANCH": "",
+      "LUCI_CI": "True",
+      "LUCI_PR": "",
+      "LUCI_WORKDIR": "[START_DIR]",
+      "OS": "linux",
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+      "@@@STEP_LOG_LINE@raw_io.output_text@  }@@@",
+      "@@@STEP_LOG_LINE@raw_io.output_text@  @@@",
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+        "hostname": "rdbhost"
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+    "name": "Verify provenance.delete request",
+    "~followup_annotations": [
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+    "luci_context": {
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+        "name": "dart-internal:flutter"
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+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Verify provenance.write artifacts.zip.vsa.intoto.jsonl",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@artifacts.zip.vsa.intoto.jsonl@This artifact is definitely legitimate!@@@",
+      "@@@STEP_LOG_END@artifacts.zip.vsa.intoto.jsonl@@@"
+    ]
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+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
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+          "update_token": "token"
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+        "hostname": "rdbhost"
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+    },
+    "name": "Verify provenance.gsutil upload \"flutter/12345abcde12345abcde12345abcde12345abcde/android-x86-jit-release/artifacts.zip.vsa.intoto.jsonl\"",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
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+    ]
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+      "https://www.googleapis.com/auth/bcid_verify https://www.googleapis.com/auth/cloud-platform",
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+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
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+          "update_token": "token"
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+        "hostname": "rdbhost"
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+    "name": "Verify provenance.get access token for default account (2)",
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+      "@@@STEP_NEST_LEVEL@1@@@"
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+    "cmd": [
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+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
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+      "file_hash",
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+      "DEPOT_TOOLS": "RECIPE_REPO[depot_tools]",
+      "ENGINE_CHECKOUT_PATH": "[CACHE]/builder",
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+        "hostname": "rdbhost"
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+    "name": "Verify provenance.Compute file hash (2)",
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+      "@@@STEP_TEXT@Hash calculated: fbfb5fc4b831f5dfa5c448eb386ba7a67d27063a8ddf1049d941c2d41cebb521@@@"
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+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LINK@gsutil.upload@https://storage.cloud.google.com/download.flutter.io/io/flutter/x86_debug/1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584/x86_debug-1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584.pom@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/src/out",
+      "[CLEANUP]/out-cas-directory_tmp_1"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Copy host_debug_unopt"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "RECIPE_MODULE[recipe_engine::cas]/resources/infra.sha1",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "read infra revision",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@infra.sha1@git_revision:mock_infra_git_revision@@@",
+      "@@@STEP_LOG_END@infra.sha1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "install infra/tools/luci/cas"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "install infra/tools/luci/cas.ensure package directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision",
+      "-ensure-file",
+      "infra/tools/luci/cas/${platform} git_revision:mock_infra_git_revision",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "install infra/tools/luci/cas.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:moc\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/luci/cas/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/cas/git_revision%3Amock_infra_git_revision/cas",
+      "archive",
+      "-cas-instance",
+      "projects/example-cas-server/instances/default_instance",
+      "-dump-digest",
+      "/path/to/tmp/",
+      "-paths-json",
+      "[[\"[CLEANUP]/out-cas-directory_tmp_1\", \".\"]]",
+      "-log-level",
+      "debug"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Archive full build for None",
+    "timeout": 900.0,
+    "~followup_annotations": [
+      "@@@STEP_LINK@CAS UI@https://cas-viewer.appspot.com/projects/example-cas-server/instances/default_instance/blobs/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0/tree@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Set output properties",
+    "~followup_annotations": [
+      "@@@SET_BUILD_PROPERTY@cas_output_hash@{\"android_jit_release_x86\": null, \"full_build\": \"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/0\"}@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "pkill",
+      "chrome"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Killing Processes.kill chrome",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "dart"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Killing Processes.kill dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "flutter"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Killing Processes.kill flutter",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "java"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Killing Processes.kill java",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "adb"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "Killing Processes.kill adb",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "top",
+      "-b",
+      "-n",
+      "3",
+      "-o",
+      "%MEM"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "realm": {
+        "name": "dart-internal:flutter"
+      },
+      "resultdb": {
+        "current_invocation": {
+          "name": "invocations/build:8945511751514863184",
+          "update_token": "token"
+        },
+        "hostname": "rdbhost"
+      }
+    },
+    "name": "OS info (2)"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file
diff --git a/recipes/engine_v2/builder.py b/recipes/engine_v2/builder.py
index 4204b9e..79fbe0d 100644
--- a/recipes/engine_v2/builder.py
+++ b/recipes/engine_v2/builder.py
@@ -26,7 +26,6 @@
  }
 """
 import contextlib
-import copy
 
 from google.protobuf import struct_pb2
 from PB.recipes.flutter.engine.engine import InputProperties
@@ -35,7 +34,6 @@
 
 DEPS = [
     'depot_tools/depot_tools',
-    'depot_tools/gsutil',
     'flutter/archives',
     'flutter/build_util',
     'flutter/flutter_bcid',
@@ -211,6 +209,18 @@
     for archive_config in archives:
       outputs[archive_config['name']] = Archive(api, checkout, archive_config)
     api.flutter_bcid.report_stage('upload-complete')
+    for archive_config in archives:
+      if api.flutter_bcid.is_official_build():
+        # TODO(drewroengoogle): Remove try-except block to make the verification
+        # failure a release blocker.
+        try:
+          with api.step.nest("Verify provenance"):
+            Verify(api, checkout, archive_config)
+        except:  # pylint: disable=bare-except
+          api.step(
+              '(Non-blocking) Provenance verification failed - check step above',
+              []
+          )
   # Archive full build. This is inefficient but necessary for global generators.
   if build.get('cas_archive', True):
     full_build_hash = api.shard_util_v2.archive_full_build(
@@ -237,7 +247,24 @@
     api.flutter_bcid.upload_provenance(path.local, path.remote)
 
 
-def RunSteps(api, properties, env_properties):
+def Verify(api, checkout, archive_config):
+  """Verifies a set of artifacts through BCID using artifact provenance."""
+
+  paths = api.archives.engine_v2_gcs_paths(checkout, archive_config)
+
+  for path in paths:
+    gcs_path = path.remote
+    gcs_path_without_prefix = str.lstrip(gcs_path, 'gs://')
+    file = api.path.basename(gcs_path)
+    bucket = gcs_path_without_prefix.split('/', maxsplit=1)[0]
+    gcs_path_without_bucket = '/'.join(gcs_path_without_prefix.split('/')[1:])
+
+    api.flutter_bcid.download_and_verify_provenance(
+        file, bucket, gcs_path_without_bucket
+    )
+
+
+def RunSteps(api, properties, env_properties):  # pylint: disable=unused-argument
   # Collect memory/cpu/process before task execution.
   api.os_utils.collect_os_info()
   api.flutter_bcid.report_stage('start')
@@ -274,7 +301,8 @@
   api.os_utils.kill_processes()
   # Collect memory/cpu/process after task execution.
   api.os_utils.collect_os_info()
-  
+
+
 def GenTests(api):
   build = {
       "archives": [{
@@ -356,11 +384,25 @@
       api.monorepo.try_build(),
   )
 
+  fake_bcid_response_success = '''
+  {
+    "allowed": true,
+    "verificationSummary": "This artifact is definitely legitimate!"
+  }
+  '''
+  fake_bcid_response_failure = '''
+  {
+    "rejectionMessage": "failed to validate!"
+  }
+  '''
   build_custom = dict(build)
   build_custom["gclient_variables"] = {"example_custom_var": True}
   build_custom["tests"] = []
+  artifacts_location = 'artifacts.zip'
+  jar_location = 'x86_debug-1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584.jar'
+  pom_location = 'x86_debug-1.0.0-0005149dca9b248663adcde4bdd7c6c915a76584.pom'
   yield api.test(
-      'dart-internal-flutter',
+      'dart-internal-flutter-success',
       api.properties(build=build, no_goma=True),
       api.buildbucket.ci_build(
           project='dart-internal',
@@ -368,4 +410,30 @@
           git_repo='https://flutter.googlesource.com/mirrors/engine',
           git_ref='refs/heads/main',
       ),
+      api.step_data(
+          'Verify provenance.verify %s provenance' % artifacts_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_success)
+      ),
+      api.step_data(
+          'Verify provenance.verify %s provenance' % jar_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_success)
+      ),
+      api.step_data(
+          'Verify provenance.verify %s provenance' % pom_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_success)
+      ),
+  )
+  yield api.test(
+      'dart-internal-flutter-failure',
+      api.properties(build=build, no_goma=True),
+      api.buildbucket.ci_build(
+          project='dart-internal',
+          bucket='flutter',
+          git_repo='https://flutter.googlesource.com/mirrors/engine',
+          git_ref='refs/heads/main',
+      ),
+      api.step_data(
+          'Verify provenance.verify %s provenance' % artifacts_location,
+          stdout=api.raw_io.output_text(fake_bcid_response_failure)
+      ),
   )