Security researcher and developer Antoine Riard has left the Lightning Network's development team, expressing concerns about security threats to the Bitcoin ecosystem. Riard raised alarm about replacement cycling attacks that target Lightning Network's payment channels and suggested that addressing these issues might require changes at the base-layer of Bitcoin.

He emphasized the need for a sustainable solution, even if it means altering the underlying Bitcoin network, which would necessitate community support. Riard aims to focus on Bitcoin core development but cautioned about the challenges in the broader cryptocurrency ecosystem.