320af8cc-f09d-483d-b095-e0d849750d85 txid
i had amount of btc in hitbtc exchange btc wallet and i sent the btc amount to my USDT Tether wallet address in hitbtc exchange by mistake.
I don't think double spending in this case is possible, as you have no control over your private keys, and neither does HitBTC have this feature implemented (?).
I'd suggest to contact their support immediately, and ask them to stop broadcasting your transaction.
Also, -- Why in hell would you sent BTC to a USDT adress in the same exchange? I'm not sure what HitBTC's policy is, but even if the transaction confirms, the money is still recoverable, i'm just not really that sure if they're willing to do it for you.
320af8cc-f09d-483d-b095-e0d849750d85 Isn't a valid transaction on either chain?
https://blockchain.info/search?search=320af8cc-f09d-483d-b095-e0d849750d85&searchbar=homepagehttp://omnichest.info/lookuptx.aspx?txid=320af8cc-f09d-483d-b095-e0d849750d85