--- title: What are time stamps? description: test --- [Skip to content](https://help.cloudsign.jp/en/articles/2151317#main-content) - [English](https://help.cloudsign.jp/en/articles/2151317) - [日本語](https://help.cloudsign.jp/ja/articles/2151317) English Show submenu for translations [![クラウドサイン ヘルプセンター](https://help.cloudsign.jp/hs-fs/hubfs/%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_white_RGB@4x-1.png?width=170&height=40&name=%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_white_RGB@4x-1.png)](https://help.cloudsign.jp/en/?hsLang=en) Open main navigation Close main navigation - - [English](https://help.cloudsign.jp/en/articles/2151317) - [日本語](https://help.cloudsign.jp/ja/articles/2151317) English Show submenu for translations How can we help you? - There are no suggestions because the search field is empty. 1. [CloudSign Help Center](https://help.cloudsign.jp/en?hsLang=en) 2. [Electronic signature](https://help.cloudsign.jp/en/electronic-signature?hsLang=en) # What are time stamps? Time stamps are digital verifications of time issued by a trusted authority. With CloudSign, all documents are applied with time stamps. For the documents it has been used with, **the technology certifies “when” a contract was concluded for “what.”** \* For Free Plan users and those on the Standard Plan with no long-term signature function included, documents you sent that were concluded before September 6, 2020 are not applied with a time stamp. ---   ### Role of time stamps - The digital data existed at the exact time of the time stamp (proof of existence of data) - The digital data has not been tampered with after the exact time of the time stamp (non-tamper evidence) CloudSign uses the time stamp services of AMANO (AMANO Corporation) acting as a “[Time Stamping Authority (TSA)](https://www.dekyo.or.jp/touroku/contents/repository/index.html)” as stipulated by the National Tax Agency of Japan under the Law(or Act) on Book and Record Keeping through Electronic Methods. Applying this extends the term of validity of electronic signatures to ten years. [This site](https://www.dekyo.or.jp/touroku/contents/repository/index.html) includes CloudSign as a company using trusted time stamps.　 Please also see [here](https://help.cloudsign.jp/en/articles/385221?hsLang=en) for more details on electronic signatures. - [FAQ](https://help.cloudsign.jp/en/faq?hsLang=en#main-content) - [About CloudSign](https://help.cloudsign.jp/en/faq?hsLang=en#about-cloudsign) - [About documents](https://help.cloudsign.jp/en/faq?hsLang=en#about-documents) - [About operation](https://help.cloudsign.jp/en/faq?hsLang=en#about-operation) - [notification emails](https://help.cloudsign.jp/en/faq?hsLang=en#notification-emails) - [Plans](https://help.cloudsign.jp/en/plans?hsLang=en#main-content) - [Free plan](https://help.cloudsign.jp/en/plans?hsLang=en#free-plan) - [Paid Plan](https://help.cloudsign.jp/en/plans?hsLang=en#paid-plan) - [Free option](https://help.cloudsign.jp/en/plans?hsLang=en#free-option) - [Paid option](https://help.cloudsign.jp/en/plans?hsLang=en#paid-option) - [Collaboration plan](https://help.cloudsign.jp/en/plans?hsLang=en#collaboration-plan) - [Email address setting and login setting](https://help.cloudsign.jp/en/email-address-setting-and-login-setting?hsLang=en#main-content) - [login](https://help.cloudsign.jp/en/email-address-setting-and-login-setting?hsLang=en#login) - [Sending documents](https://help.cloudsign.jp/en/sending-documents?hsLang=en#main-content) - [Upload and edit documents](https://help.cloudsign.jp/en/sending-documents?hsLang=en#upload-and-edit-documents) - [Destination settings](https://help.cloudsign.jp/en/sending-documents?hsLang=en#destination-settings) - [Bulk sending](https://help.cloudsign.jp/en/sending-documents?hsLang=en#bulk-sending) - [Settings when sending](https://help.cloudsign.jp/en/sending-documents?hsLang=en#settings-when-sending) - [Operations after sending](https://help.cloudsign.jp/en/sending-documents?hsLang=en#operations-after-sending) - [Template](https://help.cloudsign.jp/en/sending-documents?hsLang=en#template) - [Receiving documents](https://help.cloudsign.jp/en/receiving-documents?hsLang=en#main-content) - [Recipient guide](https://help.cloudsign.jp/en/receiving-documents?hsLang=en#recipient-guide) - [Receiving docs](https://help.cloudsign.jp/en/receiving-documents?hsLang=en#receiving-docs) - [Managing documents](https://help.cloudsign.jp/en/managing-documents?hsLang=en#main-content) - [Document confirmation](https://help.cloudsign.jp/en/managing-documents?hsLang=en#document-confirmation) - [Enter document information](https://help.cloudsign.jp/en/managing-documents?hsLang=en#enter-document-information) - [Document import](https://help.cloudsign.jp/en/managing-documents?hsLang=en#document-import) - [Setting ・Administrator privilege](https://help.cloudsign.jp/en/setting-administrator-privilege?hsLang=en#main-content) - [Personal settings](https://help.cloudsign.jp/en/setting-administrator-privilege?hsLang=en#personal-settings) - [Administrator settings](https://help.cloudsign.jp/en/setting-administrator-privilege?hsLang=en#administrator-settings) - [Advanced settings](https://help.cloudsign.jp/en/setting-administrator-privilege?hsLang=en#advanced-settings) - [Electronic signature](https://help.cloudsign.jp/en/electronic-signature?hsLang=en) - [API・External service linkage](https://help.cloudsign.jp/en/api-external-service-linkage?hsLang=en#main-content) - [Web API](https://help.cloudsign.jp/en/api-external-service-linkage?hsLang=en#web-api) - [External collaboration](https://help.cloudsign.jp/en/api-external-service-linkage?hsLang=en#external-collaboration) - [CloudSign Payments](https://help.cloudsign.jp/en/api-external-service-linkage?hsLang=en#cloudsign-payments) - [Law](https://help.cloudsign.jp/en/api-external-service-linkage?hsLang=en#law) - [Security](https://help.cloudsign.jp/en/security?hsLang=en) - [Troubleshooting](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#main-content) - [Login](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#login) - [Email sending and receiving](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#email-sending-and-receiving) - [Input items / consent related](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#input-items-consent-related) - [PDF / signature related](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#pdf-signature-related) - [Address settings and document information](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#address-settings-and-document-information) - [Others](https://help.cloudsign.jp/en/troubleshooting?hsLang=en#others) [![クラウドサイン ヘルプセンター](https://help.cloudsign.jp/hs-fs/hubfs/%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_color_RGB@4x.png?width=170&height=40&name=%E3%82%AF%E3%83%A9%E3%82%A6%E3%83%89%E3%82%B5%E3%82%A4%E3%83%B3_logo_horizontal_color_RGB@4x.png "クラウドサイン ヘルプセンター")](https://www.cloudsign.jp/) © 2015 Bengo4.com, Inc.