> Therefore, the input==output check is sufficient: if I use the same
> set of signers for an input and an output, I can be sure that the
> change goes to the same multisig wallet.
This is sufficient, in a simple case.
I consider cases where spending from different wallets ('wallet
compartments
hello,
On 07. 05. 19 15:40, Dmitry Petukhov via bitcoin-dev wrote:
> At the setup phase, hardware wallet can sign a message that consists of
> xpubs of participants, and some auxiliary text. It can use the key
> derived from the master key, with path chosen specifically for this
> purpose.
This s
> > Even with this additions to the PSBT format, I think PSBT-signing
> > devices still need to store the xpubs of their co-signers. It's not
> > possible to safely show an incoming address to the user without a
> > full understanding of the other keys in a "multisig wallet". Also,
> > it represe
> I'd rather see the xpubs shared in the global section of the file,
> with the restriction that they must/should only include the hardened
> prefix of the path. The existing bip32 derivation path included in
> individual inputs and outputs be merged in as needed.
> After all in a typical PSBT, we
On Fri, Apr 26, 2019 at 05:21:06PM +0200, Stepan Snigirev wrote:
...
> Currently in PSBT there is no way to reliably say if the output uses the
> keys derived from the same root keys as the inputs aside from the key owned
Writing the multisig support for Coldcard, I've come to the same conclusion.
Hi Stepan,
I think that this would be a good extension.
Just for clairty, by xpub, do you mean the extended serialization format
defined in BIP 32 or the Base58 check encoded string of that serialization?
Andrew
On 4/26/19 11:21 AM, Stepan Snigirev via bitcoin-dev wrote:
> Hi list,
>
> I was l
Hi list,
I was looking at the bip174 PSBT specs, in particular for multisignature
setup, and I think with current spec there is a way to steal user funds in
M of N setup with M ≤ N/2.
I made a small write-up on this:
https://github.com/stepansnigirev/random_notes/blob/master/psbt_multisig.md
To
