> 
> So how are you going to do "think cash" in a way that:
> 
> 1.  Is not some weak clientside security measure.
Puzzle generates target insertion key.
> 2.  Does not require any Java or Javascript or any other sort of smart
>     content.
See 1

> 3.  Does not make freenet-mail even slower.
Email recipient knows to look only at puzzle results, makes fmail faster.
> 4.  Is quite reliable.
See 1/3
> 5.  A well designed computer program couldn't get past the "think
>     cash" by knowing either what the questions are and what the
>     answers should be or doing some simple sort of artificial
>     intelligence.
AI is not all that advanced.  Machine vision sucks, so a visual puzzle is
the easiest current choice.
> 6.  Does not require any sort of daemons running on remote machines
>     (like mailing list software does) or modifications to the Freenet
>     node.
See 1

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