Turn off stake notifications:
1.- Go to your OK wallet.
2.- Click "Settings" and then "Options" from the top menu.
3.- Scroll down on the options section till you get to notifications.
4.- In the "Notifications" section, deselect them all, and just select "receive with and sent with" (That way "mining" [Stake] notifications wont appear, will only appear for the selected options)
5.- And Click OK.
Enjoy
(http://i.imgur.com/hP0wvxi.png)
(http://i.imgur.com/8LP3LFE.png)