Add spending condition trees to multiplex NUT-10#127

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conduition wants to merge 3 commits intocashubtc:mainfrom conduition:spending-condition-trees

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Commits on May 27, 2024

Add spending condition trees to multiplex NUT-10
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Commits on Jul 19, 2024

Merge branch 'main' into spending-condition-trees
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Commits on Jul 29, 2024

Proof.witness must be a string to match other NUTs
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