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# Proof of Work for onion service introduction
The overall denial-of-service prevention strategies in Tor are described in the [Denial-of-service prevention mechanisms in Tor](../dos-spec/index.md) document. This document describes one specific mitigation, the proof-of-work client puzzle for onion service introduction.
This was originally [proposal 327, A First Take at PoW Over Introduction Circuits](../proposals/327-pow-over-intro.txt) authored by George Kadianakis, Mike Perry, David Goulet, and tevador.
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