It works very simply. Every user with a FluidFi account, can hold, deposit and exchange EUR/USD/GBP/CHF. From there, a user can press 'mint' to turn his USD into $DUSD in his/her Metamask, within minutes. When cashing out back into USD, you just press 'redeem', the contract burns your $DUSD, and you get credited with real US dollars in your account again. This is how we ensure not only a full 1:1 backing that is verifiable on-chain, but also the best user experience possible.