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This looks like an amazing idea, why didn't you proceed further? I would love to see something like it, that could help certify messages :)

Amazing idea but very ugly per se. The thought of mixing "human semantics" with signature in an whole text sends shivers down my spine.

It's pretty similar conceptually to how we sign email, except that the signature would be invisible to humans.

Of course nobody ever said how we sign emails is beautiful.