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Bitcoin Optech #140: Rescuing Lightning Transactions

This week’s Bitcoin Optech newsletter describes discussion on rescuing lost Lightning Network funding transactions, announcements of releases and release candidates, and notable changes to popular Bitcoin infrastructure software.The Bitcoin Optech newsletter provides readers with a top-level summary of the most important technical news happening in Bitcoin, along with resources that help them learn more. To help our readers stay up-to-date with Bitcoin, we’re republishing the latest issue of this newsletter below. Remember to subscribe to receive this content straight to your inbox.This week’s newsletter describes a discussion about rescuing lost LN funding transactions and includes our regular sections with announcements of releases, release candidates, and notable changes to popular Bitcoin infrastructure software.NewsRescuing lost LN funding transactions: LN funding transactions are not safe in the presence of transaction malleability. Segwit eliminated third-party malleability as a concern for most transactions, but it doesn’t address the case where the creator of a transaction mutates its txid themselves, such as by fee bumping the funding transaction using Replace-by-Fee (RBF). If a txid mutation happens, then the pre-signed refund transaction is not valid, so the user can’t get their funds back. Additionally, the remote node may not automatically see the funding transaction and so may not be able to help the funder get their money back.This week, Rusty Russell posted to the Lightning-Dev mailing list about a quick and experimental feature he implemented in C-Lightning to help a user with this problem recover their funds. He also …
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