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There was a paper somewhere proposing a scheme for filtering email spam with the use of Bitcoin micropayments. I can't remember where I saw it and can't find it now. Anybody knows about it?

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Hashcash is one of the many anti-spam techniques used today, which is essentially a proof-of-work system designed to limit not only email spam but also denial-of-service attacks. A similar proof-of-work methodology is being used in bitcoin for block generation.

With an average of 150 billion e-mails sent out on a daily basis I cannot see how this could be deployed in the blockchain, which would then have to be adjusted to facilitate 1,7 million TPS while now it only serves 7 TPS (artificial limit).

Also, bitcoin is not really made for such small payments which would result in tons of useless and unspendable dust outputs.

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    I know about hascash and am aware of the scalability problems with Bitcoin being used for this. I'm only interested in the paper from a pure academical standpoint.
    – knaperek
    Commented Aug 29, 2014 at 20:19

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