On Fri, Sep 11, 2015 at 04:57:46PM -0600, Warren Young wrote:
> I wonder if this is an implementation detail leaking through into the
> UI, though.  Under what conditions, except for Noam’s contrived example
> with hardcoded dates, is there a useful distinction between “hash” —
> implying a number that you could reliably recompute given all the input
> data — and “random number”?

The SHA1 hash is just a deterministic random number for this purpose.
Making it deterministic just means that the identifier can also double
as checksum.

Joerg
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