pirattitude
to see collateral deposited and borrowed synths in zapper
https://blog.synthetix.io/eth-loans-are-live-on-layer-two-through-staking/
Detailed in SIP-97 and SIP-195:
https://sips.synthetix.io/sips/sip-97/
https://sips.synthetix.io/sips/sip-195/