Thanks. This line is so important I think:"OmiseGO is building its own blockchain, but not every operation will happen on it. Though basic decisional operations happen on the OmiseGo blockchain, the final delivery happens on the Ethereum blockchain. OMG is an ERC20 token."
It is really great advantage to have own blockchain and for big financial world is this almost necessary. OmiseGO made a very good decision in this way.