RPOW - Reusable Proofs of Work
mitd writes "Hal Finney is inviting folks to test drive his new hashcash-based server rpow.net.
" The RPOW system provides for proof of work (POW) tokens to be reused. A POW token is something that takes a relatively long time to compute but which can be checked quickly."
Hal's security model paper is well worth the read and his proof of concept code is available for download.
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