About UUID v4
A UUID (Universally Unique Identifier) version 4 is a standardized 128-bit format for creating unique identifiers. They are randomly generated and have an extremely low probability of duplication.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
- x is a random hexadecimal digit (0-9 or a-f)
- y is a random choice from 8, 9, a, or b