I’m questioning whether or not the next situation is feasible. Any assist may be very appreciated.
Alice and Bob are making a (taproot) 2-of-2 multisig collectively. They don’t belief one another. They intend to fund the multisig handle with 1 BTC every however earlier than they ship their Bitcoin to the multisig handle, they presign a transaction (the redeem transaction) that spends 1 BTC again from the multisig to every of them. Solely when each of them have a replica of this unbroadcasted transaction, will they proceed to fund the multisig.
Is that this attainable? As a way to presign the redeem transaction they would want to know the TXID of the outputs they intend to ship to the multisig, appropriate? In order that they would want to create their separate funding transactions that go into the multisig and share the TXID with one another (however don’t broadcast it but). Then they assemble and signal the redeem transaction. Then they broadcast the funding transactions. Is that this attainable or am I pondering too difficult?
Additionally, what if the payment surroundings adjustments throughout this course of and one of many funding transactions doesn’t get confirmed? Then the presigned redeem transaction is nugatory since utilizing RBF on the funding transaction would change the TXID and thus invalidate the presigned redeem transaction? Is there a solution to circumvent that?
Thanks rather a lot!
EDIT: Right here is an instance of a scenario that describes what I need to obtain. Alice and Bob need to create a enterprise fund. They have no idea during which startup to speculate simply but. In fact, they are going to solely put money into a startup if each agree that it’s a good funding. In order that they create a 2-of-2 multisig for this goal. Earlier than funding it, nevertheless, they consider what would occur if the opposite celebration disappears or if they won’t come to an settlement about the place to speculate. They might block the others funds indefinitely. Due to this fact they need to must choice to exit the multisig unliterally to predefined addresses.
