We keep most of your crypto in a custodial service.
We borrow fiat against it and lend it to our clients. In the unlikely event of a very sharp fall of the crypto market, our clients will face kind of a ‘margin call’ - their crypto-collateral will no longer cover their loans.
So they either cover their fiat debt, or their crypto-collateral is sold to cover said debt, we cover our loans from the banks, you get back your crypto.
Sure, we only lend 56% of the value of the collateral.