The bridge switches between BCH (mainchain), and smartBCH. This is a BCH sidechain which mimics Ethereum Virtual Machine. If you don't have Metamask, or another wallet with smartBCH, click "connect to smartBCH" to get it set up. Send coins greater than 0.01 BCH to the QR codes or addresses shown. You must not send the "Pool Balance", amount. Cashaddr is a good option. The bridge will wait less than one minute to confirm doublespend proof for amounts less than 1 BCH. The bridge will wait for 1 confirmation for amounts between 1 BCH to 50 BCH. The bridge will wait for 2 confirmations for amounts greater than 50 BCH.