VRFs are interesting critters: https://en.wikipedia.org/wiki/Verifiable_random_function
"Unlike traditional digital signature algorithms, VRF outputs can be published publicly without being subject to a preimage attack, even if the verifier knows the public key (but not the proof). This is useful to prevent enumeration of the names/identifiers in a directory which is using a transparency system.” They are basically deterministic signatures like RSA or BLS with a hash function applied, that one models as a random oracle. https://crypto.stackexchange.com/a/58281 https://www.cs.bu.edu/~goldbe/papers/nsec5.html https://www.cs.bu.edu/~goldbe/projects/vrf https://crypto.stackexchange.com/a/50683
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