If I had a foundation: body cameras.
the camera would look like a tiny button, indistinguishable from a shirt button. it would clip onto your shirt or anything else. they would be available for a cost of $1. also available: identical appearing buttons that are not cameras, price 100 for $1. the idea is that you can sprinkle them all over your clothing and belongings and nobody would know which ones of these buttons are cameras or buttons or what. the camera records continuous loop video and audio, and pushes this video, in real (reel?) time, to your phone and also to the cloud. this could occur by linking to your phone or picking up nearby wifi signals.