Among them, it is necessary to put a reliable time stamp on the digitally signed transactions, thus solving a series of practical and legal problems. Because the user's desktop time is easy to change, the timestamp generated by this time is unreliable, so an authoritative third party is needed to provide reliable and undeniable timestamp service.

Time is very important information in various government and commercial documents. In a written contract, the date of signing the document is as important as the signature to prevent the document from being forged and tampered with.

In electronic documents, it is also necessary to take security measures for the date and time information of documents, and DTS (Digital Time Stamp Service) can provide security protection for the release time of electronic documents.

Generally speaking, the process of generating digital timestamps is as follows: users first use hash algorithm to form a summary of files that need to be timestamped, and then send the summary to DTS. DTS encrypts (digitally signs) the file after adding the date and event information of receiving the file summary, and then delivers it to the user.