diff --git a/cas_wrapper.py b/cas_wrapper.py
index 8835270..7968685 100644
--- a/cas_wrapper.py
+++ b/cas_wrapper.py
@@ -1,7 +1,15 @@
+from concurrent.futures import ThreadPoolExecutor, as_completed
 import json
-from typing import Dict
+import logging
+import typing
 
 from plumbum import local, ProcessExecutionError
+from pydantic import BaseModel
+
+
+class CasArtifact(BaseModel):
+    path: str
+    cas_hash: typing.Optional[str]
 
 
 class CasWrapper:
@@ -16,6 +24,7 @@ class CasWrapper:
             self,
             cas_api_key: str,
             cas_signer_id: str,
+            logger: logging.Logger = None,
     ):
         if self.binary_name not in local:
             raise FileNotFoundError(
@@ -23,19 +32,16 @@ class CasWrapper:
             )
         self._cas_api_key = cas_api_key
         self._cas_signer_id = cas_signer_id
-        with local.env(
-                CAS_API_KEY=self._cas_api_key,
-                SIGNER_ID=self._cas_signer_id
-        ):
-            self._cas = local['cas']
-            self._cas['login']()
+        self._cas = local['cas']
+        self._logger = logger
+        if self._logger is None:
+            self._logger = logging.getLogger()
 
     def __enter__(self):
         with local.env(
             CAS_API_KEY=self._cas_api_key,
             SIGNER_ID=self._cas_signer_id,
         ):
-            self._cas = local['cas']
             self._cas['login']()
         return self
 
@@ -45,7 +51,7 @@ class CasWrapper:
     def notarize(
             self,
             local_path: str,
-            metadata: Dict = None,
+            metadata: typing.Dict = None,
     ) -> str:
         """
         Wrapper around `cas notarize`
@@ -110,3 +116,59 @@ class CasWrapper:
         if return_json:
             return json_result
         return not bool(json_result['status'])
+
+    def authenticate_source(
+        self,
+        local_path: str,
+    ) -> typing.Tuple[bool, typing.Optional[str]]:
+        is_authenticated = False
+        commit_cas_hash = None
+        with self as cas:
+            try:
+                result_json = cas.authenticate(local_path, return_json=True)
+                # it should return 0 for authenticated and trusted commits
+                is_authenticated = not bool(
+                    result_json.get('status', 1))
+                commit_cas_hash = result_json.get('hash')
+            # we can fall with ProcessExecutionError,
+            # because source can be not notarized
+            except ProcessExecutionError:
+                self._logger.exception('Cannot authenticate %s:', local_path)
+        return is_authenticated, commit_cas_hash
+
+    def authenticate_artifact(
+        self,
+        local_path: str,
+    ) -> bool:
+        is_authenticated = False
+        with self as cas:
+            try:
+                is_authenticated = cas.authenticate(local_path)
+            # we can fall with ProcessExecutionError,
+            # because source can be not notarized
+            except ProcessExecutionError:
+                self._logger.exception('Cannot authenticate %s:', local_path)
+        return is_authenticated
+
+    def notarize_artifacts(
+        self,
+        artifacts: typing.List[CasArtifact],
+        metadata: typing.Dict[str, typing.Any],
+    ) -> bool:
+        all_artifacts_is_notarized = True
+        with self as cas, ThreadPoolExecutor(max_workers=4) as executor:
+            futures = {
+                executor.submit(cas.notarize, artifact.path, metadata): artifact
+                for artifact in artifacts
+                if not artifact.cas_hash
+            }
+            for future in as_completed(futures):
+                artifact = futures[future]
+                try:
+                    cas_artifact_hash = future.result()
+                except Exception:
+                    self._logger.exception('Cannot notarize artifact:')
+                    all_artifacts_is_notarized = False
+                    continue
+                artifact.cas_hash = cas_artifact_hash
+        return all_artifacts_is_notarized
diff --git a/setup.py b/setup.py
index f19dd49..5da82c7 100644
--- a/setup.py
+++ b/setup.py
@@ -21,6 +21,7 @@ setup(
     scripts=['cas_wrapper.py'],
     install_requires=[
         'plumbum>=1.7.2',
+        'pydantic>=1.8.1',
     ],
     python_requires=">=3.6",
 )