The Ristretto specification defines a way to do hash-to-curve. The hash-to-curve draft and other drafts (such as the one on OPRFs) recommend doing it using hashtobase+elligator2 as with Ed25519 instead. A forthcoming paper is going to propose a 3rd way. This is annoying.
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And people who don’t want things to be slow for the sake of eliminating a virtually nonexistent bias will simply map a random 255 bit string.
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