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Tutela
As apart of the first iteration of a bounty program to incentivize contributors, a task concept formed regarding to help identify poor usage of the protocol - that could compromise an individual user's privacy. Which would mean the creation of a tool to compute the relative strength of any of the protocol's anonymity sets and identify potential leaks in certain transactional patterns.
Interest gathered from external actors and over the the span of 3 months, a group of independent developers and academics came and coproduced Tutela; a tool to probabilistically find relations between addresses using Tornado Cash through specific heuristics and fingerprint clustering.
https://arxiv.org/abs/2201.06811
You can try out the application publicly, tutela.xyz and view the source code.