> For the complete documentation index, see [llms.txt](https://econtract-docs.matbao.in/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://econtract-docs.matbao.in/tien-ich/kiem-tra-chu-ky-so.md).

# Kiểm tra chữ ký số

Để kiểm tra chữ ký số, tại thanh menu chọn “Kiểm tra chữ ký số”.

Chọn file cần kiểm tra, tải lên hệ thống.

![Hình minh họa trang 45 - ảnh 2](https://econtract-images.matbaoflow.io.vn/d/19QHuKR2xKEDzlwGIWy5V4nVjH1wQ_6EZ/)

Nếu hợp đồng đã ký có thay đổi thông tin hợp đồng sẽ hiện lỗi không hợp lệ.

![Hình minh họa trang 46 - ảnh 1](https://econtract-images.matbaoflow.io.vn/d/1wa2ebE8-GLRfQoi5RBsg76MwrDZZI_7_/)

Nếu hợp đồng đã ký không có thay đổi thông tin, hệ thống sẽ hiển thị chữ ký số hợp lệ.

![Hình minh họa trang 46 - ảnh 2](https://econtract-images.matbaoflow.io.vn/d/1_GQhKlzT7ex1Uxf6-5tpLV-EweCmOKk-/)


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