BIP375 Sending Silent Payments with PSBTs uses PSBTv2, specifically the PSBT_OUT_SCRIPT 
field.

For silent payments, the output script is not known at the time of 
creation, so it's not possible to create an unsigned transaction with an 
output script as required in v0.

On Friday, January 17, 2025 at 4:17:49 AM UTC-5 Sjors Provoost wrote:

> Dear list,
>
> It's been a few years since BIP370 was proposed [0]. It's a backwards 
> compatible change to the PSBT standard defined by BIP174 [1]. Its main 
> benefit is the ability to add new inputs and outputs to a transaction.
>
> There's a Bitcoin Core pull request #21283 implements support [2], but has 
> seen very little review so far. Being able to test it against other 
> implementation would aid in review.
>
> So which projects are using PSBTv2 or would very much like to?
>
> So far I've learned that Core Lightning uses it. They convert it back to 
> v0 when interacting with Bitcoin Core, which they find suboptimal [3].
>
> Feel free to answer here on Stack Exchange [4].
>
> Kind regards,
>
> Sjors Provoost
>
> [0] https://github.com/bitcoin/bips/blob/master/bip-0370.mediawiki
> [1] https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki
> [2] https://github.com/bitcoin/bitcoin/pull/21283
> [3] https://github.com/bitcoin/bitcoin/pull/21283#issuecomment-2597171643
> [4] 
> https://bitcoin.stackexchange.com/questions/125384/who-uses-or-wants-to-use-psbtv2-bip370

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