RPOW - Reusable Proofs of Work

[Matt Crawford]

On Aug 20, 2004, at 16:09, Hal Finney wrote:

>> 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.
>
> The first MTA would exchange the received RPOW for a new one of equal
> value, and pass it along with the message to the next MTA in line.

Right, I'm saying that's a possible use for RPOW, other than one that's 
equivalent to digital cash.  Sorry if my intent wasn't clear.


---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo at metzdowd.com