Legal basis: Article 13 of the Electronic Signature Law of People's Republic of China (PRC) shall be regarded as a reliable electronic signature if the electronic signature meets the following conditions at the same time: (1) When the electronic signature production data is used for electronic signature, it belongs exclusively to the electronic signatory; (2) When signing, the electronic signature production data is only controlled by the electronic signer; (3) Any changes to the electronic signature after signature can be found; (4) Any changes to the content and form of the data message after signature can be found.