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Of course, but it would be cool if you could also calculate the public component on paper (and ideally verify it computerless as well). You could really create your bitcoin/ether/etc wallet with the public key only, whilst having an extremely low attack surface (private key never touches computer memory).

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I wonder if a slightly more feasible solution of producing and verifying a solution out of simple TTL, so there's no "computer" just a application specific machine made of simple commodity parts which one could trust reasonably easily would be actually worth something.

But remember the caveats about using the same key pair for multiple transactions: https://en.bitcoin.it/wiki/Address_reuse

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