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They can still.... using the above formula.
I recomend you please read this screenshort from steemtools.com written and Disclaimed by Steemit.com

Interesting. But.. this goes to key management and trust. With the current system, using a master key only on steemit, you could change master key on logged in site and then cancel power down or otherwise.

Ok 👌 as you think,I'm also not an expert in this field, however Nowadays anything can happen anytime,just remember this.

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