i need very urgent to sell my 8.5 bitcoins for paypal the website where i have to pay only accepting paypal
8.5 btc for your paypal!
What you're saying is that you have to pay somewhere 4,414 USD & they only accept PayPal & no other payment processors?
Could be an eBay purchase perhaps?
In any rate, can you sign a message with the Wallet Address they are in?
In either case, for such an amount, I would suggest (as others have done) that you seek out an Escrow for such a large amount.