Excuse me, do you want to ask the question "How to ensure the reliability of accounting files without paper"? The guarantee method of this document is as follows:

1. Electronic signature: Electronic signature is the attribute and parameter of electronic document. Its essence is data or files stored on a computer. Some electronic signatures have nothing to do with data. Electronic signature file can prove the source of the file and the content created by the file, and generally can prevent it from being tampered with.

Time stamp: Time stamp refers to information that can prove the existence and integrity of an electronic data at a specific time.

Blockchain: Blockchain technology uses timestamp and digital signature technology to ensure the authenticity and integrity of electronic data.