diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9c78b30..8648986 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - Add case for a template resource_type in append_data method in PaginatedChildrenResult model
+- Add `Proof` model and `ProofType` enum
+- Add a proof field to the `Row` model
+- Add serialization tests for the new model
 
 ## [4.2.0] - 2026-07-09
 
diff --git a/docs-source/smartsheet_enums.rst b/docs-source/smartsheet_enums.rst
index 6dc5c82..7010a8c 100644
--- a/docs-source/smartsheet_enums.rst
+++ b/docs-source/smartsheet_enums.rst
@@ -177,6 +177,14 @@ PredecessorType
    :undoc-members:
    :show-inheritance:
 
+ProofType
+------------------------------------------
+
+.. automodule:: smartsheet.models.enums.proof_type
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 PublishAccessibleBy
 ------------------------------------------------------
 
diff --git a/docs-source/smartsheet_models.rst b/docs-source/smartsheet_models.rst
index ba2cc8f..d887377 100644
--- a/docs-source/smartsheet_models.rst
+++ b/docs-source/smartsheet_models.rst
@@ -561,6 +561,14 @@ ProjectSettings
    :undoc-members:
    :show-inheritance:
 
+Proof
+-----
+
+.. automodule:: smartsheet.models.proof
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 Recipient
 ---------
 
diff --git a/smartsheet/models/__init__.py b/smartsheet/models/__init__.py
index 564e175..259ea51 100644
--- a/smartsheet/models/__init__.py
+++ b/smartsheet/models/__init__.py
@@ -78,6 +78,7 @@
 from .predecessor import Predecessor
 from .predecessor_list import PredecessorList
 from .project_settings import ProjectSettings
+from .proof import Proof
 from .recipient import Recipient
 from .create_report_request import CreateReportRequest
 from .create_report_result import CreateReportResult
diff --git a/smartsheet/models/enums/__init__.py b/smartsheet/models/enums/__init__.py
index 35a8eb8..bba2815 100644
--- a/smartsheet/models/enums/__init__.py
+++ b/smartsheet/models/enums/__init__.py
@@ -41,6 +41,7 @@
 from .operator import Operator
 from .paper_type import PaperType
 from .predecessor_type import PredecessorType
+from .proof_type import ProofType
 from .publish_accessible_by import PublishAccessibleBy
 from .report_aggregation_type import ReportAggregationType
 from .report_asset_type import ReportAssetType
diff --git a/smartsheet/models/enums/proof_type.py b/smartsheet/models/enums/proof_type.py
new file mode 100644
index 0000000..b25ac1e
--- /dev/null
+++ b/smartsheet/models/enums/proof_type.py
@@ -0,0 +1,28 @@
+# pylint: disable=C0111,C0302
+# Smartsheet Python SDK.
+#
+# Copyright 2016 Smartsheet.com, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"): you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from __future__ import absolute_import
+
+from enum import Enum
+
+
+class ProofType(Enum):
+    DOCUMENT = "DOCUMENT"
+    IMAGE = "IMAGE"
+    MIXED = "MIXED"
+    NONE = "NONE"
+    VIDEO = "VIDEO"
diff --git a/smartsheet/models/proof.py b/smartsheet/models/proof.py
new file mode 100644
index 0000000..f89fbff
--- /dev/null
+++ b/smartsheet/models/proof.py
@@ -0,0 +1,174 @@
+# pylint: disable=C0111,R0902,R0904,R0912,R0913,R0915,E1101
+# Smartsheet Python SDK.
+#
+# Copyright 2016 Smartsheet.com, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"): you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from __future__ import absolute_import
+
+from ..types import Boolean, EnumeratedValue, Number, String, Timestamp, TypedList, TypedObject, json
+from ..util import deserialize, serialize
+from .attachment import Attachment
+from .discussion import Discussion
+from .enums import ProofType
+from .user import User
+
+
+class Proof:
+
+    """Smartsheet Proof data model."""
+
+    def __init__(self, props=None, base_obj=None):
+        """Initialize the Proof model."""
+        self._base = None
+        if base_obj is not None:
+            self._base = base_obj
+
+        self._id_ = Number()
+        self._original_id = Number()
+        self._name = String()
+        self._type_ = EnumeratedValue(ProofType)
+        self._document_type = String()
+        self._proof_request_url = String()
+        self._version = Number()
+        self._last_updated_at = Timestamp()
+        self._last_updated_by = TypedObject(User)
+        self._is_completed = Boolean()
+        self._attachments = TypedList(Attachment)
+        self._discussions = TypedList(Discussion)
+
+        if props:
+            deserialize(self, props)
+
+        self.__initialized = True
+
+    def __getattr__(self, key):
+        if key == "id":
+            return self.id_
+        elif key == "type":
+            return self.type_
+        else:
+            raise AttributeError(key)
+
+    def __setattr__(self, key, value):
+        if key == "id":
+            self.id_ = value
+        elif key == "type":
+            self.type_ = value
+        else:
+            super().__setattr__(key, value)
+
+    @property
+    def id_(self):
+        return self._id_.value
+
+    @id_.setter
+    def id_(self, value):
+        self._id_.value = value
+
+    @property
+    def original_id(self):
+        return self._original_id.value
+
+    @original_id.setter
+    def original_id(self, value):
+        self._original_id.value = value
+
+    @property
+    def name(self):
+        return self._name.value
+
+    @name.setter
+    def name(self, value):
+        self._name.value = value
+
+    @property
+    def type_(self):
+        return self._type_
+
+    @type_.setter
+    def type_(self, value):
+        self._type_.set(value)
+
+    @property
+    def document_type(self):
+        return self._document_type.value
+
+    @document_type.setter
+    def document_type(self, value):
+        self._document_type.value = value
+
+    @property
+    def proof_request_url(self):
+        return self._proof_request_url.value
+
+    @proof_request_url.setter
+    def proof_request_url(self, value):
+        self._proof_request_url.value = value
+
+    @property
+    def version(self):
+        return self._version.value
+
+    @version.setter
+    def version(self, value):
+        self._version.value = value
+
+    @property
+    def last_updated_at(self):
+        return self._last_updated_at.value
+
+    @last_updated_at.setter
+    def last_updated_at(self, value):
+        self._last_updated_at.value = value
+
+    @property
+    def last_updated_by(self):
+        return self._last_updated_by.value
+
+    @last_updated_by.setter
+    def last_updated_by(self, value):
+        self._last_updated_by.value = value
+    @property
+    def is_completed(self):
+        return self._is_completed.value
+
+    @is_completed.setter
+    def is_completed(self, value):
+        self._is_completed.value = value
+
+    @property
+    def attachments(self):
+        return self._attachments
+
+    @attachments.setter
+    def attachments(self, value):
+        self._attachments.load(value)
+
+    @property
+    def discussions(self):
+        return self._discussions
+
+    @discussions.setter
+    def discussions(self, value):
+        self._discussions.load(value)
+
+    def to_dict(self):
+        return serialize(self)
+
+    def to_json(self):
+        return json.dumps(self.to_dict())
+
+    def __str__(self):
+        return self.to_json()
diff --git a/smartsheet/models/row.py b/smartsheet/models/row.py
index 2b00215..964dd53 100644
--- a/smartsheet/models/row.py
+++ b/smartsheet/models/row.py
@@ -27,6 +27,7 @@
 from .column import Column
 from .discussion import Discussion
 from .enums import AccessLevel
+from .proof import Proof
 from .user import User
 
 
@@ -62,6 +63,7 @@ def __init__(self, props=None, base_obj=None):
         self._outdent = Number()
         self._parent_id = Number()
         self._permalink = String()
+        self._proof = TypedObject(Proof)
         self._row_number = Number()
         self._sheet_id = Number()
         self._sibling_id = Number()
@@ -268,6 +270,14 @@ def permalink(self):
     def permalink(self, value):
         self._permalink.value = value
 
+    @property
+    def proof(self):
+        return self._proof.value
+
+    @proof.setter
+    def proof(self, value):
+        self._proof.value = value
+
     @property
     def row_number(self):
         return self._row_number.value
diff --git a/smartsheet/reports.py b/smartsheet/reports.py
index f1add31..3be704a 100644
--- a/smartsheet/reports.py
+++ b/smartsheet/reports.py
@@ -143,7 +143,7 @@ def get_report(
             page (int): Which page to return.
             include (list[str]): A comma-separated list of
                 optional elements to include in the response. Valid list values:
-                attachments, discussions, format, objectValue, scope, source, sourceSheets.
+                attachments, discussions, proofs, format, objectValue, scope, source, sourceSheets.
             level (int): compatibility level
 
         Returns:
diff --git a/tests/mock_api/test_mock_serialization.py b/tests/mock_api/test_mock_serialization.py
index d86bdc7..6bbdffe 100644
--- a/tests/mock_api/test_mock_serialization.py
+++ b/tests/mock_api/test_mock_serialization.py
@@ -3,9 +3,10 @@
 import pytest
 from smartsheet.models import (
     AlternateEmail, Attachment, Column, Comment, ContainerDestination, CrossSheetReference,
-    Discussion, ExplicitNull, Favorite, FormatDetails, Group, ImageUrl, MultiRowEmail, Recipient,
-    Row, Schedule, Sheet, SheetEmail, UpdateRequest, User, Workspace
+    Discussion, ExplicitNull, Favorite, FormatDetails, Group, ImageUrl, MultiRowEmail, Proof,
+    Recipient, Row, Schedule, Sheet, SheetEmail, UpdateRequest, User, Workspace
 )
+from smartsheet.models.enums import ProofType
 from smartsheet.models.object_value import DURATION
 
 from tests.mock_api.mock_api_test_helper import MockApiTestHelper, clean_api_error
@@ -532,3 +533,19 @@ def test_cross_sheet_reference_serialization(self):
         }))
 
         assert response.result.name == 'Some Cross Sheet Reference'
+
+    @clean_api_error
+    def test_proof_serialization(self):
+        self.client.as_test_scenario('Serialization - Proof')
+
+        row = self.client.Sheets.get_row(1, 2, include=['proofs'])
+
+        assert row.proof.id == 100
+        assert row.proof.original_id == 100
+        assert row.proof.name == 'Sample Proof Document'
+        assert row.proof.type.value == ProofType.IMAGE
+        assert row.proof.document_type == 'NONE'
+        assert row.proof.proof_request_url == 'https://app.smartsheet.com/b/proofs/sheets/test123/proofs/proof456'
+        assert row.proof.version == 1
+        assert row.proof.last_updated_by.email == 'john.doe@smartsheet.com'
+        assert row.proof.is_completed is False