wallet: control which taproot script path to spend #33084

1. 
   Sjors commented at 7:49 am on July 29, 2025: member

   When there’s multiple script paths we can spend, the wallet just (partially) signs all of them. We then pick the one with the lowest fees:

   https://github.com/bitcoin/bitcoin/blob/321984705dbcc5982013c8cfb52389cf3f2e75f6/src/script/sign.cpp#L373-L389

   The user may want to override this, e.g.:

   1. For privacy reasons they don’t wish to reveal the less secure (but cheaper) fallback condition.
   2. Their co-signer software trips up if it sees something in the taproot_script_path_sigs it can’t handle (similar to e.g. https://github.com/LedgerHQ/app-bitcoin-new/pull/340)

   #32857 lets the user avoid script path spending altogether. Similarly it would be good if they can manually pick one.

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Sjors