When I say "reasonable pseudonyms" I mean first and second name combinations which can be read and remembered reasonably and which could be taken for a human person.
An example of the purpose of such a system would be for someone to publish a series of writings all apparently by different authors, but which they could later incontrovertibly show to be the work of the same person.
I know nothing about cryptography.
Save different secret keys for each pseudonym, and later the identity may be revealed by private key validation . You don’t have to use bogbook, you could sign any text segment, without disclosing the public key(s) until you were ready to reveal authorship.