Zecpass is basically a privacy bridge between shielded Zcash and Robinhood Chain.
You send ZEC from Zcash’s shielded pool to a fresh temporary Zcash address,
which hides the original sender. A solver/relayer then converts that value into ETH,
moves it through Arbitrum to Robinhood Chain, and deposits it into a temporary “pass” address
linked only to your chosen Robinhood wallet. The Zecpass contract then uses that ETH to buy ZECPASS
and sends the tokens to your wallet. So the key technology is using Zcash’s shielded transactions
to break the direct on-chain link between
the person funding the transaction and the public Robinhood wallet receiving the tokens. 0x5f3e6a9139cb1eb9a2deb59089d31eac880ba867