hsmtool: implement new derivetoremote method
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This method has a similar purpose as "guesstoremote" but is for use when the channel's database ID is known. It produces the private key that can spend the to_remote output of the peer's commitment transaction. It assumes the channel was negotiated with option_static_remotekey unless the optional per-commitment point argument is provided. Changelog-Added: hsmtool has a new `derivetoremote` method.
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This method has a similar purpose as
guesstoremotebut is for use when the channel's database ID is known. It produces the private key that can spend the to_remote output of the peer's commitment transaction. It assumes the channel was negotiated withoption_static_remotekeyunless the optional per-commitment point argument is provided.Changelog-Added: hsmtool has a new
derivetoremotemethod.Motivation: I implemented this method so that I could import my funds from remote unilateral closures into other wallets. While
guesstoremotecould mostly get the job done, it's needlessly slow when we already know the database ID of the channel, and it doesn't work at all for channels that were negotiated withoutoption_static_remotekey.