The paper-held key is a strong differentiator, but the buyer value seems harder to explain than the security architecture.
Curious whether non-technical prospects understand this primarily as secure long-term storage, proof of existence, or controlled physical custody of the file — which one gets the strongest reaction?
Backing up a file is easy. Making sure someone else can find it and open it in thirty years isn't — so I print the only key on a certificate, post it, and destroy my copy.
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