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This will be mostly possible in the upcoming Bitcoin Core 0.18 release. First you need to understand that the sequence of such paired multisig addresses (with public keys generated from 2 xpubs in lockstep) can be described in the new descriptor language. The syntax is sh(multi(2,XPUB/*,XPUB/*)). The sh indicates P2SH embedding, multi refers to multisig, ...


None. No wallet that exists discards private keys. That would be superbly idiotic to do because that means that money could be thrown away permanently. No wallet would intentionally do that.


You can’t. Bitcoin does not work by names, emails, or material things of that nature. Bitcoin works in an anonymous way where public keys are the names and private keys the persons. There is no way to figure out what you are asking, At all.

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