Thanks for the extra analysis. My feeling was that it would be possible, but I 
wasn't sure. 

Luckily my current use cases don't depend on keeping UUIDs secret, but I was 
still wondering if there was a trade off. A mention in the docs seems 
worthwhile.

Cheers 

> On 4 Mar 2015, at 21:40, "danle...@gmail.com" <danle...@gmail.com> wrote:
> 
> Also, if someone were given another time based UUID to use as a basis of 
> comparison, they could eliminate 47 more bits of randomness to guess at.  So, 
> I think you make a good point that I think will be worthwhile to mention in 
> my documentation.   Thank you.
> 
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