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Owner key is not required and I don't think it will ever be..that's why it is a disabled textbox in the images. It will be removed before the app is released. Secondly, I agree about security and I am adding the option for users to encrypt the key with a password when the app is first used..but they will have to enter the pass everytime they open the app because that will not be stored. That's the best I'll be able to do for assurances.

I am the creator of the cryptocurrency exchange app, QuatlooTrader, that I released in 2015. 1000's of people used and still use it for trading in the many cryptocurrency exchanges like Poloniex, Bittrex , and others. some people then had the same concerns as they had to enter their private api keys into the application to use it. there has never been anyone to suggest there ever was any dishonesty with that app and it is still used today! Its a judgement call, but i'm not just some nobody coming out of the woodwork without any reputation. All that being said, I understand your concern.