[2/?] - input: add taproot chan scripts, control block logic, and spending routines #7333
Commits on May 26, 2023
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input: add PayToTaprootScript helper func
In this commit, we add a helper function to take a taproot output key and turn it into a v1 witness program.
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input: add GenTaprootFundingScript based on musig2
In this commit, we add GenTaprootFundingScript, which'll return the taproot pkScript and output for a taproot+musig2 channel. This uses musig2 key aggregation with sorting activated. The final key produced uses a bip86 tweak, meaning that the output key provably doesn't commit to any script path. In the future, we may want to permit this, as then it allows for a greater degree of programmability of the funding output.
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input: add tapscript utils for the sender HTLC script
Unlike the old HTLC scripts, we now need to handle the various control block interactions. As is, we opt to simply re-compute the entire tree when needed, as the tree only has two leaves.
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input: restore usage of NUMS key for to_remote output
In this commit, we restore usage of the NUMS key for the to remote output, as this allows a remote party to scan the chain in order to find their remote output that in emergency recovery scenarios.
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input: use script path for revocation clause for to_local output
In this commit, we modify the to_local script to use a script path for the revocation scenario. With this change, we ensure that the internal key is always revealed which means the anchor outputs can still always be swept.
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input: use explicit CSV 1 script for to remote output
We undo the prior hack here to make the final script more readable. The difference is just 1 byte between the two.
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