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Frontrunning Block Attack in PoA Clique: A Case Study. (arXiv:2205.10257v1 [cs.CR])
May 23, 2022, 1:20 a.m. | Xinrui Zhang, Qin Wang, Rujia Li, Qi Wang
cs.CR updates on arXiv.org arxiv.org
As a fundamental technology of decentralized finance (DeFi), blockchain's
ability to maintain a distributed fair ledger is threatened by manipulation of
block/transaction order. In this paper, we propose a frontrunning block attack
against the Clique-based Proof of Authority (PoA) algorithms. Our attack can
frontrun blocks from honest in-turn sealers by breaking the proper order of
leader selection. By falsifying the priority parameters (both
\textit{difficulty} and \textit{delay time}), a malicious out-of-turn sealer
can always successfully occupy the leader position and produce …
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