Refactor and test `psbt::derive_sp`#27

Merged

nymius merged 13 commits intobitcoindevkit:masterfrom

nymius:refactor/psbt-derive-sp

Jul 29, 2025

Commits on Jul 17, 2025

refactor(send): add DataForPartialSecret struct and SpkWithSecret type alias
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feat(send): add SpSendError::KeyError for key provider failures
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feat(send): add MissingDerivations and MissingOutputs error types
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refactor(send): make create_silentpayment_scriptpubkeys infallible
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style(send): format imports in psbt module
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refactor(send): extract psbt::get_prevout_script from psbt::derive_sp
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refactor(send): extract psbt::get_taproot_secret from psbt::derive_sp
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refactor(send): extract psbt::get_non_taproot_secret from psbt::derive_sp
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refactor(send): extract psbt::build_full_txin from psbt::derive_sp
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refactor(send): extract psbt::collect_input_data from psbt::derive_sp
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refactor(send): extract psbt::update_outputs from psbt::derive_sp
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refactor(send): refactor derive_sp to use extracted functions
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refactor(send): split psbt module in mod.rs and tests.rs
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