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# Bitcoin Developer Raises Concerns with Potential Backdoor in Lightning Network. How crucial is it?
- URL: https://www.metatalks.ai/bitcoin-developer-raises-concerns-with-potential-backdoor-in-lightning-network-how-crucial-is-it/
- Published: 2023-10-23T11:39:40.000Z
- Updated: 2023-10-23T11:39:40.000Z
- Author: Katelyn Chow
- Tags: lightning, bitcoin, btc, blockchain, backdoor, analysis

[Bitcoin Core](https://river.com/learn/terms/b/bitcoin-core/?ref=metatalks.ai) developer and security researcher Antoine Riard [stepped down](https://lists.linuxfoundation.org/pipermail/lightning-dev/2023-October/004154.html?ref=metatalks.ai) from the [Lightning Network](https://river.com/learn/terms/l/lightning-network/?ref=metatalks.ai)’s development team, citing security concerns due to a potential backdoor that could allow attackers to get control over the [Layer 2](https://river.com/learn/terms/l/layer/?ref=metatalks.ai) protocol.

![](https://lh7-us.googleusercontent.com/V0tUWnDZq5PZolnDnxy3mlPUBPGqpIrzTD7AudXDttosXObJmFwZFrTjw6D8AXqRCTTPESwy_Qiw_Awuw2md10Ki_yilQCfLwZxu-BRKbbIwjnr5fS1gpaKMgNQT3LurlA9Zlny2Lp_RXtqdoz1JlrIXassvyU1y)

In a [thread](https://lists.linuxfoundation.org/pipermail/lightning-dev/2023-October/004154.html?ref=metatalks.ai) on the Linux Foundation’s public mailing list, Riard argued the Bitcoin community faces a “hard dilemma” as a novel class of replacement cycling attacks puts Lightning in a “very perilous position.“

![](https://lh7-us.googleusercontent.com/FBmdBtwLAwX68-bUmc79HONyBFyhODN9ZzCsjv7GxauKLZsc8C2RvH_qpwPquLTCD16nGO1k6DWv7I4_E-GtoOpNLmuDbzc83n3nTyHPw7WOo_JRf0IwkCB8gAUdyY81WQ0ou9ov1Cv7yfcYK8ZF47iAqaSQDc74)

([Thread](https://twitter.com/mononautical/status/1715736832950825224?ref=metatalks.ai))

This type of attack specifically targets the Lightning Network’s [payment channels](https://river.com/learn/terms/l/lightning-channel/?ref=metatalks.ai), manipulating transaction details in a way that could enable hackers to steal funds without detection (see [explainer thread](https://twitter.com/mononautical/status/1715736832950825224?ref=metatalks.ai) above). In short, it works by changing the signature of a victim’s timeout transaction in the mempool, replacing it with a new transaction without leaving any trace in the network.

In his statement, Riard argued that these new security risks place the Lightning Network in a precarious position. While there are existing measures to counter simple versions of this attack, Riard believes that more complex forms could successfully exploit the system.

![](https://lh7-us.googleusercontent.com/zyYVVHVUBuooHFJxWP3rXXWhSQJhLO_VaWf0b4SVuhZjlbvFtEoKiYhGlQbX-7e9AYXR3kBFRTQgg_6Qj_Dswf1QWHuLuNftmURgND1DeUu7UAVkBRYAJhjxUqNtBfCLDDoEDZ6bcf3yCGaGbdVfvdX7uol7uT4I)

([Thread](https://twitter.com/mononautical/status/1715736832950825224?ref=metatalks.ai))

To effectively tackle this issue, he suggests that fundamental changes may need to be made at the foundational level of the Bitcoin network. This, he emphasized, would require a high degree of openness and community agreement.

![](https://lh7-us.googleusercontent.com/veEUiRT2CuBe7f0EnXF30FnSXGwhkyM4wFLeu4hzwWam_I89DqZUT9CEsZtNQexLh2kU9ts4Hu9Ff5sebafSZN-zY4yzQmm5FK6ASJLPVBAoWDGdAubRKEupQ70b3AwhzzfafqxpRrDOeAjeO1jvRp1ZOPR0-qmc)

([Thread](https://twitter.com/mononautical/status/1715736832950825224?ref=metatalks.ai))

Meanwhile, Lightning Network’s growth has jumped 1200% in 2 years, according to [River](https://twitter.com/River?ref=metatalks.ai)’s new [report](https://blog.river.com/the-lightning-network-in-2023/?ref=metatalks.ai), with around 6.6 million users routed transactions in August.

![](https://lh7-us.googleusercontent.com/sLdABR-1gS2OB1CcSK7giTv8E5rDeubtrL9NxYlTBMnT4E_JXXWOxDXusDPYh5pR8cOBeXHHSLklcJjzZ8Pq_EMGnrBWsv9I3eYEGMngmeJK6vx15Pa_QYCMoC27d7mf4iHMKOTdbMpqrb3iJKdPXqbEnqMWTYWN)

![](https://lh7-us.googleusercontent.com/WP2fr4RerFAzDcGX0dJLULZ5ZjPvwvoHUW_g3IM3qgJCV6fJgmFCf3d8TakGrNZkZehWkAN6pEaRYUmF25dRLMOHUVO0waqGRhwp78R1q93qPN9BuIfkDxl5F3agaSrW4KLPslDa_AImL2mF6jx9MVv2fSUUneVo)

([Thread](https://twitter.com/River/status/1714671881167790338?ref=metatalks.ai))

Moving forward, a transparent and prompt solution will be crucial to maintain public confidence in Lightning Network’s ability to scale Bitcoin efficiently and securely.

![](https://lh7-us.googleusercontent.com/t0SVmiBHXPY-ho9oL4WKc7arDDERI06Hv2Nx4SjVcXmVdUkHICSJ-LSUoKE4iSKUkTlkPh-f4kPjuKOJOxrzvCaAFa-jHtWky34ePpuH-48Kl7n5kdC8jZEl2_wYyVXDuIwmgp3mCUK46B8UZM4yIRzy19XMz9VC)

Riard, though, now plans to focus solely on Bitcoin Core development while warning the community about upcoming challenges for the broader cryptocurrency ecosystem.

![](https://lh7-us.googleusercontent.com/lBiBkJGUkDufMFASGPANPpIDVASi2y4PWn4MlBtDq8tXpJb7UKBl5T2WOHh-J1LIuqgN5YFLangKHUph2HOusx6JUgahGr0D3ZvYlwI-Bz12QB1qbjH0uHBLF4-F5Q5WOdvDmiFuETMO46Tw0fl3HSsfO0ElvrPT)

![](https://lh7-us.googleusercontent.com/obhW3xLxdMYmd3ahnEvyH2p_AKH7ohgsTFkkl9KthweGRD5xEkH-SQsWbq423kVRmNjoHSqcp-yJ4_ZOXYuToWt4yjAR_1z7WFFCfBgkSr_Stv7PJYAAYn8Emeq3HMgsViYQqshlDlOddOIG5LBcLpjAqtPYOr5f)

([Thread](https://twitter.com/DZack23/status/1715770538344305113?ref=metatalks.ai))