Editing a PSBT

[kloaec]

We currently do not allow to edit a PSBT, only to sign it, and "update" it which is to add new signatures.

It makes sense in some cases to want to edit a PSBT, for example:

• modifying an amount in a batch, without re-doing the entire tx
• modifying an input, if already spent by the time the PSBT is shared to other signers
• adding an extra output, and maybe input, to grow a batch.

This is an expected feature in the PSBT screen. I do not know how this should be done/tracked from a database perspective (txid changes).

[pythcoiner]

what about the UI side, you imagine something ala https://bip174.org/?

[darosior]

In this case we should probably duplicate it as editing any PSBT but an unsigned one would invalidate all signatures. It's a bit of a footgun to give to the user "click here and wipe all signatures you've collected until now". But maybe it's fine even without duplicating it beforehand?