Multisig outputs seem in a couple of completely different flavors:
- Naked Multisig
- P2SH
- P2SH-P2WSH
- P2WSH
- P2TR
The primary is unimaginable inefficient and by no means noticed a lot use besides as a provisional knowledge service format.
The opposite 4 all use a type of forwarding assemble within the output script that doesn’t present the concerned public keys in plain textual content. With out information of the underlying situation script, you can’t acknowledge which outputs you may spend. The underlying situation script is predicated on all three public keys, although. So, until the very same output script has been spent from earlier than, there is no such thing as a method so that you can get better the corresponding situation script with out understanding the third public key.
A backup technique for a multisig pockets should each protect the non-public keys in addition to the situation scripts of the outputs. Whereas entry to the previous permits an attacker to misappropriate the funds, entry to the latter solely leads to a lack of privateness. Due to this fact, it might be cheap to have a number of backups of the situation script, probably even in much less safe places, and to retailer a replica of the situation script with every non-public key backup. In at the moment’s age, I might advocate utilizing an output script descriptor to backup the situation script.