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"While a lot of work is focusing on investigating and proposing future changes to Script and Bitcoin’s consensus rules to add extra features, we felt that infrastructure was missing to even use features that are already there in a generic, safe, composable, and interoperable way"
miniscript automates spending script satisfaction, so miniscript enabled wallets will be forward-compatible and capable of signing new scripts. how this works is the miniscript finalizer is able to figure out how to sign any miniscript, even yet to be written or user custom ones
"Miniscript extends Bitcoin Core’s wallet’s output descriptors and complements PSBT to enable fully general updaters and finalizers." So PSBT (Partially Signed Bitcoin Transactions) is a format for passing around and coordinating stages of multi-signing. miniscript automates
partial and final signing of PSBT stages. before miniscript, PSBT formats needed hand coded template matching for new scripts and application specific signers. miniscript automates the partial signatures, and the full signature at finalizer stage. @achow101 @pwuille @sanket1729
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