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No, it uses Steem connect. Steem keychain is just an alternative to steemconnect which was developed by steemit Inc. You shouldn't be scared to use it as it is open source and very secured. Also, if you login on steemit.com with your keys steem connect is even a better option.

I login on steemit and other dApps with my posting keys but I carryout all my transactions through steemconnect because I'm sure of the security.

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