I suspect this could be improved by, say, installing the same biometric recognition machines they have use for border control at every post office/bank/etc. The

I suspect this could be improved by, say, installing the same biometric recognition machines they have use for border control at every post office/bank/etc. These machines could attest that you are present and signing something. They would still require some oversight, but one person could oversee many machines. I'm sure this is an unpopular idea on HN, but at least it's a way that our governments could use facial recognition/fingerprints/retina to reduce fraud.