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It uses Steemconnect as well as steem keychain for the operations, so at no time you have to give us your keys.

In future, users will just be redirected to DLease from MInnowBooster, but DLease needs its own engine first, still is 3 months away. You can choose to use Steemconnect or Steem Keychain which is said to be safer because all your keys are locally encrypted.

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