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It's uses median rate reported by witnesses and will take week to prevent market manipulations.

Reported rate you can see here:
https://steemd.com/witnesses

You might want to read the whitepaper.

The whitepaper says it hasn't been updated since march. With all the changes and forks going on, it does not seem prudent to rely on what it says.

But most of it should be still accurate. Anyway, it has a lot of information how Steem works and why it works that way, so it's good to read even if some details have been changed.

On Steem everything is locked.
They gonna implement something when you open post you should wait 3 days to start reading it.

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