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Distributed anonymity services, such as onion routing networks orcryptocurrency tumblers, promise privacy protection without trusted thirdparties. While the security of these services is often well-researched,security implications of their required bootstrapping processes are usuallyneglected: Users either jointly conduct the anonymization themselves, or theyneed to rely on a set of non-colluding privacy peers. However, the typicallysmall number of privacy peers enable single adversaries to mimic distributedservices. We thus present AnonBoot, a Sybil-resistant medium to securelybootstrap distributed anonymity services via public blockchains. AnonBootenforces that peers periodically create a small proof of work to refresh theireligibility for providing secure anonymity services. A pseudo-random, locallyreplicable bootstrapping process using on-chain entropy then prevents biasingthe election of eligible peers. Our evaluation using Bitcoin as AnonBoot'sunderlying blockchain shows its feasibility to maintain a trustworthyrepository of 1000 peers with only a small storage footprint while supportingarbitrarily large user bases on top of most blockchains.

Utilizing Public Blockchains for the Sybil-Resistant Bootstrapping of Distributed Anonymity Services