In this paper we propose a new micropayments scheme which can be used to
reward Tor relay operators. Tor clients do not pay Tor relays with
electronic cash directly but submit proof of work shares which the
relays can resubmit to a crypto-currency mining pool. Relays credit
users who submit shares with
tickets that can later be used to purchase improved service. Both shares
and tickets when sent over Tor circuits are anonymous. The analysis of
the crypto-currencies market prices shows that the proposed scheme can
compensate significant part of Tor relay operator's expenses.
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Proof-of-Work as Anonymous Micropayment: Rewarding a Tor Relay, by Alex Biryukov and Ivan Pustogarov
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