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A bit of a meandering answer to the question, and to answer a side question: fundamentally what is a scaling solution? OP_CTV does not increase the block space. Transactions using generally will use more block space actually (although it need not be a large amount), and relay can be optimized to equivalent. But scaling is more than just a block size ...


Based on your example it looks like you are signing the same sighash twice, so it only looks like one key signed. This example might help: https://github.com/magmahindenburg/MultisigExamples/blob/master/src/se/moar/bitcoin/multisig/MultisigPresentation.java // Sign the first part of the transaction using private key #1 Sha256Hash sighash = spendTx....

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