That should be the first thing a visitor sees on the home page. Users don't owe you a click on 'learn more'. Explain the product, and maybe even allow them to use it without creating an account, and only ask them to sign up/sign-in when absolutely necessary (like, if they try to save a note, or if they are leaving with some unsaved work)

Also, why would your average user care about 'blockstack'? That's an implementation detail that might be cool to you, but it's an irrelevant thing to put front and center. Even most nerds would be unaware of what this is.