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The Bitcoin Wiki entry for OP_CHECKSIG answers your question. OP_CHECKMULTISIG works the same way, just applied to each signature in the sequence. First of all, it depends on the SIGHASH type you, as the signer, choose. Most likely you will use the default SIGHASH_ALL for each of the required signatures, but you could actually use different SIGHASH methods ...


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You will likely need to add an OP_CHECKSEQUENCEVERIFY guard before the OP_CHECKMULTISIG statement in your output script. https://github.com/bitcoin/bips/blob/master/bip-0112.mediawiki


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The site p2sh.info somewhat covers what you are searching for.


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A multi-sig address is a hash of a script that combines multiple separate keys. In other words the purpose of it is to require multiple signatures from multiple keys that are stored (and usually generated) independently. For that reason it can not be generated from a single extended public key (xpub). What you can do, is to have multiple extended keys, and ...


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No, the descriptors language currently doesn't support BIP67. It would be easy to add a multi_bip67 or so to the language if there is a need for it.


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