Has there been any thought to standardizing file names used when creating
.psbt files? Maybe something that gives some reliability of being collision
resistant and descriptive. For example:

[8 char trim of hash of unsigned tx]+[Role that created file (Ex:
Signer)]+[4 char trim of hash of data unique to that role (Ex: partial sig)]

It may be useful to especially the combiner to have some idea of what files
they have.

-Jason Les