Meaning of UUID

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 construction process of software.

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

The UUID is 128 bit long, that is, 16 bytes. The number of possible UUIDs is 3x1038, so the probabilities of matching two UUID codes 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 is the equivalent of the fiscal folio 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 Authorized Certification Providers, who assign it at the time of validating the document, and not only from the SAT, as previously.

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