On Sun, Dec 21, 2014 at 06:10:47PM +0000, Adam Back wrote:
> Yes you could for example define a new rule that two signatures
> (double-spend) authorises something - eg miners to take funds. (And
> this would work with existing ECDSA addresses & unrestricted R-value
> choices).
>
> I wasnt really making a point other than an aside that it maybe is
> sort-of possible to do with math what you said was not possible where
> you said "This [preventing signing more than one message] is
> impossible to implement with math alone".

Introducing a bunch of clever ECDSA math doesn't change the fact that
the clever math isn't what is preventing double-spending, clever
economics is. Just like Bitcoin itself.

No sense getting people potentially confused by a bunch of complex
equations that aren't relevant to the more fundemental and much more
important principle that math alone can't prevent double-spending.