Re: RPOW - Reusable Proofs of Work

[Matt Crawford]

I'm wondering how applicable RPOW is.  Generally speaking, all
the practical applications I can think of for a proof-of-work
are defeated if proofs-of-work are storable, transferable, or
reusable.
I have some code to play online games with cryptographic protection, 
cards and dice,
and I am planning to modify it to let people make bets with RPOWs as
the betting chips.
If you think of POW as a possible SPAM mitigation, how does the first 
receiving MTA assure the next MTA in line that a message was "paid 
for?"  Certainly the mail relay doesn't want to do new work, but the 
second MTA doesn't know that the first isn't a spambot.

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