Antoine Poinsot 7417594187
miniscript: the 'd:' wrapper must not be 'u'
The value it leaves on the stack depends on the last element on the
stack. However, we can't make sure this element is OP_1 (which would
give us the 'u' property) without the MINIMALIF rule.
MINIMALIF is only policy for P2WSH, therefore giving 'd:' the 'u'
property breaks consensus soundness: it makes it possible (by consensus
but not policy) for instance to satisfy a thresh() without satisfying
at least k of its subs.

This bug was found and reported by Andrew Poelstra.
2022-04-18 16:03:29 +02:00
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