Generate a Truely Unique UUID

Watch this closely! You will never ever see this ID again at this place:

9591d967-6390-4b97-b700-35c03b5dc33eThe URI for this is: https://rfc4122v4.api.tuuid.com/9591d967-6390-4b97-b700-35c03b5dc33e

1591793 truely unique UUID's were so far generated. Potential collisions prevented: 0

What is an UUID?

What means truely unique?

Is there a warranty for this service?