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There's a critical difference though: The amount of stock sold short is externally verifiable -- and it's still more than the available stock.

Where is this information available?

For NASDAQ, I think they publish the info daily on their website. But GME is NYSE, they publish semi-monthly and you can pay for it: https://www.nyse.com/market-data/reference/nyse-group-short-...

There may be other sources available, I didn't know this either so this is what I've found so far.