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Ah, tht's easy. Your SP is your stake. I think you power up via wallet on steemit.com. To stake via Steemworld is just another way.

Savings is a kind of savings book. You and nobody else (hacking your account) has immediate access to this part of account. It costs three days to withdraw and dispose freely. It's a security tool so to say.

I think I got it. Thanks.

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