How to make taproot P2TR multiSig wallet

[whisdev]

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Bitcoinjslib provides us how to make Segwit multisig wallet.

But in my project, I need to provide all of it.

Who can help me?

[junderw]

In taproot there are two ways to make a multisig script. Since CHECKMULTISIG op code was removed for taproot.

1. "Musig", a method in which you combine N keys into a single key for signing, is more difficult and error prone. We don't offer a simple API to perform that.
2. Currently, the most secure way of doing multisig in taproot is using the CHECKSIG + CHECKSIGADD + NUMEQUAL method. See the example linked below for an example. If all you want is a single multisig, creating a scriptTree with only a single "leaf" (script) is fine. However, the multisig participants should verify that the key spend (internal pubkey) is unspendable.

https://github.com/bitcoinjs/bitcoinjs-lib/blob/8c88016d8f36e5268d6a3de3c5209e8dc29312e0/test/integration/taproot.spec.ts#L443-L529

I think I'll add a new example with just a simple multisig use case.

[junderw]

I added an example for your use case.

Please ask any questions you might have.

https://github.com/bitcoinjs/bitcoinjs-lib/blob/8d9775c20da03ab40ccbb1971251e71d117bcd8b/test/integration/taproot.spec.ts#L531-L593

[whisdev]

Thx for ur kind advice

[rustyneuron01]

I followed above examples After generate PSBT, I tried to sign PSBT use Unisat wallet but got below error "Can not sign for input #0 with the key 025321d780d099750e7fbcec128213184c9ae0a86241eeacc826c37bce7febc0b8"

What kind of problem is this?