Nym question

[Monk <monk@hod.aarg.net>]

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I'm playing with some nym code, have a few basic questions

The CREATE messages have a place for a Proof of Work entry.  There's a note
that we need to specify a system.  Any direction on this?  Unless someone
has an idea I'm going to just leave it out for now.

Also, when a nym is created a Challenge can be sent from the server.  Is
this basically something like the confirm+ address a current nymserver sends
when a new nym is created or a new reply block installed?

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