Obviously a hanko is itself a tool of the paper age. And IIRC the hanko is the reason faxes have lasted in Japan as long as they have.

I want to read the article describing this workflow —- where it makes sense to use hanko in excel.

I’m thinking about the titanic shift in document versioning systems following programming (software managed versioning. Ie. git)

A guide comparing three ways to create electronic hanko (Japanese seal stamps) for Excel: a browser-based generator, a legacy Excel add-in, and DIY with Excel shapes. Covers transparent PNG export, realistic placement, and when each method makes sense.