I wonder if we will ever find out eventually who it was?
Honestly I doubt that.
Good thing it was OTC so the impact weren't so big. Big transaction like this tend to happen OTC anyway.
Seeing from the past OTC, details always kept hidden so it'll more likely to be the same thing. What matters is the market can resume on its rally and there's no significant dump with the news.
I agree that we won't and we shouldn't even try. Plenty of high volume transactions are happening all the time. We don't know about them because they usually aren't from very old addresses like this. Sometimes it could be the same custodian but just the ownership is being transferred.