How SIGHASH_ANYPREVOUT And Eltoo Could Improve The Lightning Network

Publish date:Oct 29, 2021In this episode of “The Van Wirdum Sjorsnado,” the hosts discussed sighash flag SIGHASH_ANYPREVOUT and Eltoo, a proposed Layer 2 protocol.Watch This Episode On YouTubeListen To This Episode:AppleSpotifyGoogleLibsynOvercastIn this episode of “The Van Wirdum Sjorsnado,” hosts Aaron van Wirdum and Sjors Provoost discussed SIGHASH_ANYPREVOUT, a proposed new sighash flag that would enable…

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In this episode of “The Van Wirdum Sjorsnado,” the hosts discussed sighash flag SIGHASH_ANYPREVOUT and Eltoo, a proposed Layer 2 protocol.

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In this episode of “The Van Wirdum Sjorsnado,” hosts Aaron van Wirdum and Sjors Provoost discussed SIGHASH_ANYPREVOUT, a proposed new sighash flag that would enable a cleaner version of the Lightning Network and other Layer 2 protocols.

Sighash flags are included in Bitcoin transactions to indicate which part of the transaction is signed by the required private keys, exactly. This can be (almost) the entire transaction, or specific parts of it. Signing only specific parts allows for some flexibility to adjust the transaction even after it is signed, which can sometimes be useful.

Van Wirdum and Provoost explained that SIGHASH_ANYPREVOUT is a new type of sighash flag, which would sign most of the transaction, but not the inputs. This means that the inputs could be swapped, as long as the new inputs would still be compatible with the signature.

SIGHASH_ANYPREVOUT would be especially useful in the context of Eltoo, a proposed Layer 2 protocol that would enable a new version of the Lightning Network. In place of how Lightning users currently need to store old channel data for security reasons, and could also be punished severely if they accidentally broadcast some of this data at the wrong time, van Wirdum and Provoost explained how SIGHASH_ANYPREVOUT would do away with this requirement.

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