Pretty sure Bittrex can't keep their money, and @community321 can't keep the money, and it doesn't matter it was stolen by witnesses via a HF as to whose money it actually is.
Reckon the law specifies folks whose rightful property is stolen get it back if it's recovered, which this is. Returning it to the rightful owners is the only lawful move.
Interestingly, if it's returned while the HF that stole it is still in operation, it will get stolen again and sent to @community321 again.
Do you think that would be a separate crime? If @community321 sends it back to the owners quickly and often, the thieves might rack up quite a quantity of charges until they roll back the HF.
LOL
If it goes back there, I would say that it would have to be transferred out to other accounts not HF affected.
:D