2026-10-02T22:38:05Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:27856 2026-10-02T17:40:21Z ddc:004 open_access

Privacy-Preserving Inclusion Lists Tong, Zhengwei Eskandarian, Saba Nayak, Kartik Blockchain Inclusion List Privacy Multiparty Computation Censorship Resistance Blockchains aim to provide open access and censorship resistance, but centralization of block production in blockchains like Ethereum undermines these goals. Inclusion List (IL) protocols mitigate this by requiring block proposers to include transactions selected by an IL committee to enforce the inclusion of transactions that appear to have been censored. However, protecting the confidentiality of individual committee members’ contributions is essential to prevent retaliation and ensure robust censorship resistance. We propose a lightweight, privacy-preserving inclusion list protocol that allows committees to collectively construct transaction lists while hiding individual contributions and ensuring plausible deniability. Our approach builds on multiparty computation (MPC) techniques to achieve strong privacy without relying on heavyweight cryptography or anonymous broadcast channels. We implement two variants of our protocol design: an optimistic version providing malicious security with abort (latency ∼ 4.0s) for speed, and a robust variant (latency ∼ 124.7s) for guaranteed output delivery in the presence of a Byzantine threshold of t < n/3 malicious parties. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Zhengwei Tong and Saba Eskandarian and Kartik Nayak 2026 Is Part Of LIPIcs, Volume 395, 8th Conference on Advances in Financial Technologies (AFT 2026) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.AFT.2026.2 urn:nbn:de:0030-drops-278568 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.AFT.2026.2 eng https://creativecommons.org/licenses/by/4.0/legalcode