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Is it possible to make a multisig wallet that requires one of the keys specifically and any of the other ones in order to sign a transaction?

For example, let's say I have a 2-of-3 multisig that has signators A, B, and C. Can I make a multisig that requires that every transaction be signed by A specifically and then one of either of the other keys?

  • why does this have the nbitcoin tag? looks unrelated – knocte May 7 '18 at 8:56
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No, but instead you can make a 3-of-4 multisig where you hold both keys A and B, then you give key C to a family member, and D to someone else(just as an example). This way you are certain that you are involved in all transactions. I presume this is the end result you are after?

  • That works and makes sense. – Jay Stevens Feb 8 '17 at 12:34
  • no need the "D" key. just 3-of-4 of (A+A+B+C) – amaclin Oct 7 '17 at 9:16
  • ahh, very clever amaclin – m1xolyd1an Oct 8 '17 at 19:41
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There is another solution but it removes the ability to identify who signed the second transaction. Create a 2 of 2 multisig wallet in Electrum. The first signature is yours. The second signature is done via a hardware wallet like Trezor. Clone that Trezor as many times as you want with the recovery seed.

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