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CKeyStore is a rich interface that provides many features, including knowledge of scripts and pubkeys for solving, private keys for signing, in addition to watch-only keys and scripts, and distinguishing lack of keys from them just being encrypted. The signing logic in script/sign does not actually need most of these features. Here we introduce a simpler interface (SigningProvider) which *only* provides keys and scripts. This is actually sufficient for signing. In addtion, we swap the dependency between keystore and script/sign (keystore now depends on script/script with CKeyStore deriving from SigningProvider, rather than CKeyStore being the interface that signing relies on).