Bribe Fork: Cheap Bribing Attacks via Forking Threat
CoRR(2024)
摘要
In this work, we reexamine the vulnerability of Payment Channel Networks
(PCNs) to bribing attacks, where an adversary incentivizes blockchain miners to
deliberately ignore a specific transaction to undermine the punishment
mechanism of PCNs. While previous studies have posited a prohibitive cost for
such attacks, we show that this cost may be dramatically reduced (to
approximately $125), thereby increasing the likelihood of these attacks. To
this end, we introduce Bribe Fork, a modified bribing attack that leverages
the threat of a so-called feather fork which we analyze with a novel formal
model for the mining game with forking. We empirically analyze historical data
of some real-world blockchain implementations to evaluate the scale of this
cost reduction. Our findings shed more light on the potential vulnerability of
PCNs and highlight the need for robust solutions.
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