It would have been better if you had a beta version of it now, so everyone would be able to test it (awaiting a live version, submitted an email)

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Prior to everything, have few suggestions (in order to make it better than what's already out there, in regards to similar websites and apps):

1. Is it possible to go one level deeper and have certain keywords for each crypto-currencies to be aggregated (so there won't be a flux of articles) instead and have notifications for those?
2. In case you're planning to have a signup process in the app, it would be best to get rid of it since most crypto users prefer not to have their emails in most databases (if possible), due to possible hacks and email spams.