TIL there's a draft RFC for oblivious-PRF based blind signing scheme (so distinct from both old RSA type, and also Chaumian or Brands type using Schnorr ).
Some background on what this is and why it's interesting; first, see: "privacypass":
... an extension you can use to bypass captchas by using blinded tokens. I'm not sure of current real world status, especially w.r.t using Tor browser, which is where it's be *really* useful!
(click 'thread' to see whole discussion)
The difference between the Joinmarket and Lightning use cases (which are both about arranging to create transactions cooperatively, 'coinjoin' in some sense or other, but between untrusted entities), and the privacypass use case, is that the latter is client-server, which is the classic scenario for blind signing.
That second scenario applies both for Wasabi and Tumblebit.
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