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There are many blank [to] fields in the DB, especially from the very first month.....

I'm told the vesting account will be the same as the [from] account, but I'm unsure why this field is occasionally empty. A scan down the list makes me think large accounts / older witnesses / old accounts, and everything is above board :)

Well it's easy enough to see if the Steem has been powered up to the same account!

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