I think something like your proposal actually sounds the most logical. I just think they will bolt on chain of custody tracking to it, while promising it will only be used for finding "terrorists" or something.

Yes, while I was reading the article I couldn't help but think about notaries public. Seems like something like that would be government's go-to for this if they weren't quite so overfed on tech industry contributions that lead them down the path of AI solutions.

I'm not sure that's the right answer here, but I think it ticks a lot boxes for the state.

The nice thing about something bolted on like that is that it is not an essential feature of the core design and has no bearing on the original goal. It can be removed or reformed. The same isn't true of the approaches we are heading towards now.