Meaning of uuid (what is it, concept and definition)

What is UUID:

UUID stands for Universally Unique IDentifier , which in English literally means 'universal unique identifier'.

As such, the UUID is a standard identifier code used in the software construction process.

It is used to create universal unique identifiers that allow recognizing and distinguishing an object within a system, or the same object in different contexts.

The UUID has a length of 128 bit, that is, 16 bytes. The number of possible UUIDs is 3x1038, so the odds of two UUID codes matching are extremely low.

As such, a UUID is made up of 32 digits divided into five groups, which obey the following form: 8-4-4-4-12. That is, 36 characters and four hyphens that separate them. For example: 670b9562-b30d-52d5-b827-655787665500.

UUID in tax administration

In Mexico, for the Tax Administration System (SAT), the UUID becomes the equivalent of the tax sheet that was delivered to taxpayers. In this sense, the UUID is one of the mandatory components that the new version of electronic invoicing of the SAT must contain. However, it can now be requested from the Authorized Certification Providers, who assign it at the time of validating the document, and not just the SAT, as before.