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An Oracle will be a normal Steem account, which is elected by the SMT community to fill in that role. So, anyone can be an Oracle for a SMT - just as anyone can be a witness on the Steem blockchain - provided they will run an Oracle node, most likely, but that's already speculation.

To better answer your question, a quote from steemitblog comes handy:

Oracles will communicate with the blockchain by submitting pre-consensus whitelists of accounts through their own account.

So, the communication between the Oracles and the Steem blockchain will come pre-consensus.

thank you, i don't understand a lot, but i'm trying to keep up (-:

You're welcome! Don't worry, there will be plenty of time until these Oracles will go into action. Until then, everyone will have a clearer picture of what they are doing.

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