diff --git a/scripts/prepare_program_solutions_browser.py b/scripts/prepare_program_solutions_browser.py
index 333f58b4..739cae7a 100644
--- a/scripts/prepare_program_solutions_browser.py
+++ b/scripts/prepare_program_solutions_browser.py
@@ -9,6 +9,12 @@
 from unittest.mock import patch
 
 
+def stable_json_value(value):
+    if isinstance(value, (memoryview, bytes, bytearray)):
+        return {"binary_hex": bytes(value).hex()}
+    return str(value)
+
+
 def main():
     sys.path.insert(0, os.getcwd())
     os.environ.setdefault("DJANGO_SETTINGS_MODULE", "procollab.settings")
@@ -39,7 +45,9 @@ def main():
     manager = get_user_model().objects.get(pk=manager_id, is_active=True)
 
     def digest(value):
-        return hashlib.sha256(json.dumps(value, sort_keys=True, default=str).encode()).hexdigest()
+        return hashlib.sha256(
+            json.dumps(value, sort_keys=True, default=stable_json_value).encode()
+        ).hexdigest()
 
     def rows(model, ids):
         return list(model._base_manager.filter(pk__in=ids).order_by("pk").values())
diff --git a/scripts/verify_program_solutions_dev.py b/scripts/verify_program_solutions_dev.py
index 8f072ff0..e1b03fd7 100644
--- a/scripts/verify_program_solutions_dev.py
+++ b/scripts/verify_program_solutions_dev.py
@@ -1,6 +1,12 @@
 """Приемка API на dev; новые записи всегда откатываются транзакцией."""
 
 
+def stable_json_value(value):
+    if isinstance(value, (memoryview, bytes, bytearray)):
+        return {"binary_hex": bytes(value).hex()}
+    return str(value)
+
+
 def main():
     import hashlib
     import io
@@ -42,7 +48,9 @@ def main():
     checks, wire, programs = [], [], []
 
     def digest(value):
-        return hashlib.sha256(json.dumps(value, sort_keys=True, default=str).encode()).hexdigest()
+        return hashlib.sha256(
+            json.dumps(value, sort_keys=True, default=stable_json_value).encode()
+        ).hexdigest()
 
     models = [
         model
diff --git a/tests/test_solution_acceptance_retention.py b/tests/test_solution_acceptance_retention.py
new file mode 100644
index 00000000..5bc18b1f
--- /dev/null
+++ b/tests/test_solution_acceptance_retention.py
@@ -0,0 +1,36 @@
+"""Бинарные данные сертификата должны сравниваться по содержимому."""
+import hashlib
+import json
+import runpy
+from pathlib import Path
+from unittest import TestCase
+
+
+class AcceptanceRetentionTests(TestCase):
+    scripts = ("prepare_program_solutions_browser.py", "verify_program_solutions_dev.py")
+
+    def functions(self):
+        root = Path(__file__).resolve().parents[1]
+        for name in self.scripts:
+            yield name, runpy.run_path(str(root / "scripts" / name))["stable_json_value"]
+
+    def test_independent_binary_values_with_equal_content_have_equal_hashes(self):
+        payload = bytes(range(256))
+        for name, encode in self.functions():
+            with self.subTest(script=name):
+                variants = [memoryview(payload), memoryview(bytes(payload)), payload, bytearray(payload)]
+                hashes = {
+                    hashlib.sha256(json.dumps({"content": value}, default=encode).encode()).hexdigest()
+                    for value in variants
+                }
+                self.assertEqual(len(hashes), 1)
+
+    def test_changed_content_and_false_zero_are_distinguished(self):
+        for name, encode in self.functions():
+            with self.subTest(script=name):
+                values = [memoryview(b"before"), memoryview(b"after"), 0, False, None]
+                hashes = {
+                    hashlib.sha256(json.dumps({"value": value}, default=encode).encode()).hexdigest()
+                    for value in values
+                }
+                self.assertEqual(len(hashes), len(values))