# What is a Cryptographic Stamp Identifier (CSID)?

**URL:** <https://zatca1.discourse.group/t/what-is-a-cryptographic-stamp-identifier-csid/250>\
**Category:** Signing process\
**Created:** [July 15, 2023, 10:06pm UTC](https://zatca1.discourse.group/t/what-is-a-cryptographic-stamp-identifier-csid/250 "2023-07-15T22:06:19Z")\
**Posts on this page:** 2\
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**Author:** ![Ehab](https://avatars.discourse-cdn.com/v4/letter/e/e36b37/32.png) [@Ehab](https://zatca1.discourse.group/u/Ehab)\
**Post date:** [July 15, 2023, 10:06pm UTC](https://zatca1.discourse.group/t/what-is-a-cryptographic-stamp-identifier-csid/250/1 "2023-07-15T22:06:19Z")

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What is a Cryptographic Stamp Identifier (CSID)?

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<div class="post-metadata">

**Author:** ![Ehab](https://avatars.discourse-cdn.com/v4/letter/e/e36b37/32.png) [@Ehab](https://zatca1.discourse.group/u/Ehab)\
**Post date:** [July 15, 2023, 10:07pm UTC](https://zatca1.discourse.group/t/what-is-a-cryptographic-stamp-identifier-csid/250/2 "2023-07-15T22:07:08Z")

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A CSID is technically a cryptographic certificate, which is a credential that allows for authenticated signing and encryption of communication. The certificate is also known as a public key certificate or an identity certificate. It is an electronic document used as proof of ownership of a public key. A CSID is used to uniquely identify an Invoice Generation Solution Unit in possession of a Taxpayer for the purpose of stamping (technically cryptographically signing) Simplified Invoices (B2C) and for accessing the Reporting and Clearance APIs.