Ecash mint is similar to custodial mixer where you deposit and withdraw. However, mints use blind signatures or tokens instead of accounts.

The ecash is a bearer instrument that you purchase with bitcoin. You don't deposit and withdraw. There are no accounts to withdraw from. You redeem tokens which were purchased previously. Unless I misunderstand how it works, I'm an ecash noob. Happy to be educated. @calle

Yeah, tokens are redeemable at the bank but they are controlled by the bearer.