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Utopian uses steecomment developed by busy and maintained by steemit. There is NO way we could get your key. There is not much to explain here. Steemconnect authorises utopian to do some basic actions, like posting and you can always remove the authorisation from https://v2.steemconnect.com/dashboard. That s all

@elear thank you for your simple explanation, @bullionstackers, I think he gives a simple and clear explanation, could you reconsider what he explained.