diff --git a/masterbase/app.py b/masterbase/app.py
index f2964ba..086d02e 100644
--- a/masterbase/app.py
+++ b/masterbase/app.py
@@ -348,16 +348,20 @@ def provision_handler(request: Request) -> str:
             add_loser(app.state.engine, steam_id)
             return "limited"
 
-        api_key = check_steam_id_has_api_key(engine, steam_id)
+        api_key, existing_oid_hash = check_steam_id_has_api_key(engine, steam_id)
         new_api_key = generate_api_key()
         invalidated_text = ""
+        oid_hash = str(hash(str(request.url)))
         if api_key is not None:
-            # invalidate old API key and provision a new one
-            invalidated_text = "Your old key was invalidated!"
-            update_api_key(engine, steam_id, new_api_key)
+            if oid_hash == existing_oid_hash:
+                new_api_key = api_key
+            else:
+                # invalidate old API key and provision a new one
+                invalidated_text = "Your old key was invalidated!"
+                update_api_key(engine, steam_id, new_api_key, oid_hash)
 
         else:
-            provision_api_key(engine, steam_id, new_api_key)
+            provision_api_key(engine, steam_id, new_api_key, oid_hash)
 
         text = f"Successfully authenticated! Your API key is '{new_api_key}' {invalidated_text} Do not lose this as the client needs it!"  # noqa
 
diff --git a/masterbase/lib.py b/masterbase/lib.py
index e6e5014..9aec222 100644
--- a/masterbase/lib.py
+++ b/masterbase/lib.py
@@ -626,28 +626,34 @@ def list_demos_helper(
     return rows
 
 
-def check_steam_id_has_api_key(engine: Engine, steam_id: str) -> str | None:
+def check_steam_id_has_api_key(engine: Engine, steam_id: str) -> tuple[str | None, str | None]:
     """Check that a given steam id has an API key or not."""
     with engine.connect() as conn:
         result = conn.execute(
-            sa.text("SELECT api_key FROM api_keys WHERE steam_id = :steam_id"), {"steam_id": steam_id}
-        ).scalar_one_or_none()
+            sa.text("SELECT api_key, oid_hash FROM api_keys WHERE steam_id = :steam_id"), {"steam_id": steam_id}
+        ).one_or_none()
+        if result is None:
+            api_key, oid_hash = None, None
+        else:
+            api_key, oid_hash = result
 
-        return result
+        return api_key, oid_hash
 
 
-def update_api_key(engine: Engine, steam_id: str, new_api_key: str) -> None:
+def update_api_key(engine: Engine, steam_id: str, new_api_key: str, oid_hash: str) -> None:
     """Update an API key."""
     with engine.connect() as conn:
         updated_at = datetime.now().astimezone(timezone.utc).isoformat()
         conn.execute(
-            sa.text("UPDATE api_keys SET api_key = :new_api_key, updated_at = :updated_at WHERE steam_id = :steam_id"),
-            {"steam_id": steam_id, "updated_at": updated_at, "new_api_key": new_api_key},
+            sa.text(
+                "UPDATE api_keys SET api_key = :new_api_key, updated_at = :updated_at, oid_hash = :oid_hash WHERE steam_id = :steam_id"  # noqa
+            ),
+            {"steam_id": steam_id, "updated_at": updated_at, "new_api_key": new_api_key, "oid_hash": oid_hash},
         )
         conn.commit()
 
 
-def provision_api_key(engine: Engine, steam_id: str, api_key: str) -> None:
+def provision_api_key(engine: Engine, steam_id: str, api_key: str, oid_hash: str) -> None:
     """Provision an API key."""
     with engine.connect() as conn:
         created_at = datetime.now().astimezone(timezone.utc).isoformat()
@@ -655,11 +661,17 @@ def provision_api_key(engine: Engine, steam_id: str, api_key: str) -> None:
         conn.execute(
             sa.text(
                 """INSERT INTO api_keys (
-                    steam_id, api_key, created_at, updated_at
+                    steam_id, api_key, created_at, updated_at, oid_hash
                     ) VALUES (
-                        :steam_id, :api_key, :created_at, :updated_at);"""
+                        :steam_id, :api_key, :created_at, :updated_at, :oid_hash);"""
             ),
-            {"steam_id": steam_id, "api_key": api_key, "created_at": created_at, "updated_at": updated_at},
+            {
+                "steam_id": steam_id,
+                "api_key": api_key,
+                "created_at": created_at,
+                "updated_at": updated_at,
+                "oid_hash": oid_hash,
+            },
         )
         conn.commit()
 
diff --git a/migrations/versions/53d7f00c595e_oid_key_hash.py b/migrations/versions/53d7f00c595e_oid_key_hash.py
new file mode 100644
index 0000000..d598dcb
--- /dev/null
+++ b/migrations/versions/53d7f00c595e_oid_key_hash.py
@@ -0,0 +1,34 @@
+"""oid-key-hash
+
+Revision ID: 53d7f00c595e
+Revises: 9f376f19995e
+Create Date: 2024-07-21 20:48:37.755305
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '53d7f00c595e'
+down_revision: Union[str, None] = '9f376f19995e'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE api_keys ADD COLUMN oid_hash varchar;
+        """
+    )
+
+
+def downgrade() -> None:
+    op.execute(
+        """
+        ALTER TABLE api_keys DROP COLUMN oid_hash;
+        """
+    )