Using TOR mints (onion addresses) in cashu wallet fix this?

Well, Etags are a general privacy problem as it seems. Thanks for the writeup!

Very good post. Simple and informative. I would say the TLDR is that this is not an actual vulnerability on the ecash protocol but simple fingerprinting of the browser that the user uses. Which is a real problem and I am glad you bring this to people's attention, just in case this helps someone less...