Reusable hashcash for spam prevention

[Adam Back]

FYI Richard amended the figures in the paper which makes things 10x
more favorable for hashcash in terms of being an ecomonic defense
against spammers.

Richard wrote on asrg:
| we're grateful (albeit a little embarrassed) for the consideration
| given to one of our figures by Ted Wobber (MS Research) who has
| pointed out a tenfold error in our sum involving an 0.0023% response
| rate
| 
| we'll be revising our text accordingly -- since this will weaken our
| statements about the "economic argument" ... though it does _not_
| affect our analysis based on use of zombies.

Adam

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