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Witness encryption (WE)

tl;dr: Some notes to self on state-of-the-art witness encryption (WE) schemes. $ \def\adp{\mathsf{ADP}} \def\aadp{\mathsf{AADP}} \def\eval{\mathsf{eval}} \def\x{\mathbf{x}} \def\M{\mathsf{M}} \def\A{\mathbf{A}} \def\B{\mathbf{B}} \def\R{\mathbf{R}} \def\Rvss{\mathcal{R}_\mathsf{vss}} \def\Radp#1{\mathcal{R}_\mathsf{adp}^{#1}} \def\span{\mathsf...

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Untraceable transactions (UTT)

tl;dr: UTT is Chaumiam ecash done the right way: efficiently, decentralized and with sensible-anonymity: a user can only send (say) $\$L$ coins per month (assuming a Sybil-resistant proof-of-humanity system). UTT is academic work that started in 2018 at VMware, was rebooted in 2021 and now lives as an eprint[^TBAplus22e]. UTT did see deployment...

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