Antoine Riard, a Lightning Network (LN) developer, recently disclosed a major vulnerability affecting Bitcoin’s scaling layer. This vulnerability, which was addressed with a series of mitigations, involves a “new transaction-relay jamming attack” that can affect shared funds in channels. Riard abandoned LN-related work after testing the feasibility of these attacks in the open.
Lightning Network Major Vulnerability Detected
Antoine Riard, security researcher and developer of the Lightning Network (LN), Bitcoin’s L2 scaling solution, has recently revealed a new major vulnerability affecting funds available in channels. The vulnerability involves what Riard calls “replacement cycling attacks,” which manipulate the state of Hash Time Lock Contracts (HTLC), a fundamental part of the inner workings of the LN.
The researcher introduced mitigations to this kind of attack on October 16, clarifying that he was not sure if these actions would stop malicious actors from taking advanta

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