Upon closer inspection, the chisel end seems to have a lower angle than the knife edge. It’s a relatively thick carbon steel blade, so I’m not worried about durability, and it should be easy to sharpen. I’ll probably just keep the chisel end sharp and leave the blade itself dull.
I mean, honestly this is one of the better uses for machine learning. Not that this age checking is a good thing but if you’re going to do it on a mass scale then this seems like the right approach. I imagine that especially for a relatively heavy user this is going to be extremely accurate and far better than the alternative of providing a selfie let alone picture of an ID.