So cashu is one of the best wonderful things regarding bitcoin ... it gives privacy on cusodian wallet .. however it needs privacy too from client and server .. are you able to use it complety on onion network ?
you can now .. minibits allow you to use this amazing app with orbot and so you can access completely onion address mints. 
in the following posts i'll let you know how easy it is running an (your own) onion mint on onion network .. 
here there are 100 sats for the first one who think he could be able to run a cashu wallet on onion network !

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